Natural Sciences
Banana’s Large Plant Body Size an Advantage to Disease Control – Mak Scientists
Unlike for plants, in animals especially humans, body mass index (BMI, which is a person’s weight divided by the square of height) is a measure of physical health and pre-disposure to conditions like obesity. BMI does not make sense in plant health because of differences between plant and animal physiological systems.
However, large body size in plants may have some advantages. Apart from controlling a larger proportion of available resources and space within crowded vegetation, what other advantage does a large plant body size offer to an individual plant?
The banana’s plant body architecture
From the botanical point-of-view, the banana plant is a gigantic herb. A plant that is a herb or “herbaceous” is unable to undergo “secondary growth” and cannot form wood during its vegetative development.
The banana plant springs from an underground “true stem”, also called the “corm” or “rhizome”, to form a false stem, also called a “pseudostem” of 2-7 m height. The pseudostem is composed of the basal portions of leaf sheaths and is crowned with a rosette of 10 to 20 oblong to elliptic leaves that sometimes attain a length of 2-4 m and a breadth of 70 cm.
In mature banana plants, true stem emerges at the top of the pseudostem and bends downward to become a bunch of 10 to 300 individual fruits, or fingers, grouped in clusters, or hands, of 3 to 22. The edible part of the bunch is the female. In contrast, the inedible distal part, including the purple-colored cone-shaped end (locally known in some Ugandan dialects as “omukanaana” or “empumumpu”) constitutes the male part of the bunch.
How is the giant banana size an advantage in disease control?
A new study, titled “Xanthomonas campestris pv. musacearum Bacterial Infection Induces Organ-Specific Callose and Hydrogen Peroxide Production in Banana” and led by a team of scientists at the Department of Plant Sciences, Microbiology and Biotechnology at Makerere University in collaboration with the University of California, Davis, USA, shows how the giant banana body size can be used to control banana Xanthomonas wilt (BXW) disease.
According to Prof. Arthur Tugume, the lead scientist of this study and expert in plant pathology, when plants get infected, they respond instantly by implementing different strategies that limit the multiplication and/or mobility of the disease agents (pathogens). “For example, plants rapidly produce reactive oxygen species (ROS) such as hydrogen peroxide, superoxide ions, and hydroxyl ions. These ROS act as rapid messengers in the plant tissues to activate additional responses spreading over the entire plant body. This helps the plant’s distant tissues or organs to be aware and prepare advance defenses against the intruding pathogens”.
Prof. Dinesh-Kumar the project’s research collaborator based at the University of California-Davis, USA and expert in plant biology explains that “disease is a form of stress in plants and plants cannot perform well their biological functions when they are sick since they have to spend a lot of energy fighting against the disease. This is why disease control is important to enable plants grow well and yield high.”
The research indicates that ROS set in motion additional processes to ensure limited impact of disease and pathogens on the plant. For example, Hydrogen peroxide (H2O2), which is a ROS, has direct bactericidal, fungicidal or other anti-effects on the pathogens. Also, following H2O2 production, a unique plant carbohydrate, named “callose” starts to accumulate in large quantities within plant cells as a means of fortifying plant tissues. Callose differs from the other usual plant carbohydrates such as starch or cellulose because of the way its structures are formed.
Increased production of callose acts as a roadblock to any pathogen e.g., bacteria by limiting bacterial movement that would otherwise allow ease of attack on other tissues or cells at distant locations in the plant. “Although these plant defense responses are rapid, plant organs that are distant from the site of pathogen attack can be instrumental and block progression of bacteria or other pathogens by depositing callose in advance at strategic points” Prof. Tugume explains.
However, Prof. Tugume notes that callose participates also in many other normal developmental processes of plants, and for that reason, there is always some “housekeeping” callose in the plant tissues even without pathogenic infection. “This means that one must be able to accurately and quantitatively distinguish between ‘stress-induced’ and normal ‘housekeeping’ callose”, he adds.
How was the study done?
In this study, the researchers used young (2.5-months old) banana plantlets that had been generated from tissue culture at Kawanda Agricultural Research Institute. They then infected the plantlets with a bacterium called Xanthomonas campestris pv. musacearum (Xcm). This bacterium is the causative agent of banana Xanthomonas Wilt (BXW), the most destructive disease of bananas in East and Central Africa (ECA).
The banana leaves, pseudostems, corms and roots were analyzed for callose and compared with the control plants that had been inoculated with water instead of bacteria. H2O2 production was monitored by “DAB staining”, and by “spectrophotometry” while the analysis of callose was done by two methods: staining and visualization of callose using florescence microscopy, and using “Sandwich Enzyme-Linked Immunosorbent Assay” methods.
What did the researchers discover and how can it be used in BXW disease control?
This study revealed that the underground corm tissues assemble the stiffest resistance against BXW by depositing the highest concentrations of callose, while the pseudostem produced the highest quantities of H2O2. This is interesting for three (3) main reasons:
- Firstly, Xcm bacteria often enter through the leaves in regular plantation husbandry; hence, the corm being distant from leaves gives it an anatomical advantage in promoting the ability of lateral plants to escape Xcm infection.
- Secondly, the corm is an organ of perennation supporting vegetative and perennial continuity of the crop across seasons; hence it is charged in ensuring a disease-free next generation by severely constraining “mother-child transmission” of Xcm bacteria.
- Thirdly, the control of BXW now becomes easy when farmers are observant to the first aerial disease symptoms because Xcm is strongly constrained by bottlenecks in the pseudostem and corm.
Therefore, at the onset of aerial symptoms, diseased peudostems should immediately be removed by aseptically cutting them off at the corm without interfering with symptomless lateral shoots, which allows continuous food production and disease control to go on simultaneously. This is facilitated by the large size of the banana plant because at the onset of leaf symptoms (2.5 to 5 meters away from the corm), the bacteria have not yet arrived at the base of the pseudostem where the diseased plant can be cut off from the corm. This gives chance to a farmer to eliminate the infected pseudostems early (in 1 to 7 days) since the appearance of leaf symptoms.
This research was part of the PhD studies for Mr. Abubakar S. Mustafa at Makerere University and University of California, Davis. According to Mr. Mustafa, these discoveries make the management of BXW in banana plantations easy as long as the farmers are observant and act fast by removing diseased plants aseptically.
This study has been published by the American Phytopathological Society (APS) in an open access journal, “PhytoFrontiers”, and is freely accessible on https://apsjournals.apsnet.org/doi/full/10.1094/PHYTOFR-11-21-0073-R.
This study was funded by the Bill and Melinda Gates Foundation through the National Agricultural Research Organization (NARO), Uganda. The project had partners including the International Institute of Tropical Agriculture (IITA), the Alliance for Bioversity International and International Centre for Tropical Agriculture (CIAT) and Centre for Agriculture and Bioscience International (CABI).
For more details, contact;
Prof. Arthur Tugume
Lead Scientist
College of Natural Sciences (CoNAS)
Makerere University
Email: arthur.tugume@mak.ac.ug
Tel: +256772514841
Mr. Abubakar S. Mustafa
Co-Author and PhD student on the study
Email: mustafa.abubakar.sadik@gmail.com
Tel: +256702813233
Hasifa Kabejja
Principal Communication Officer
College of Natural Sciences (CoNAS)
Makerere University
Email: pr.cns@mak.ac.ug
Tel: +256774904211
Natural Sciences
Enhancing Data Quality: NutriFishPlus Research Assistants Retooled Ahead of Baseline Survey
The NutriFishPlus Project team successfully conducted a one-day capacity-building training for its research assistants, centered on the Monitoring, Evaluation, and Learning (MEL) framework and the household survey tool. Held on 13th January 2026 at Ridar Hotel Seeta in Mukono District, the training aimed to improve data collection, analysis, and learning processes to support evidence-based project implementation and impact assessment.
It was officially opened by Dr. Jackson Efitre, the Principal Investigator, who introduced the research assistants to the overall goal of the NutriFishPlus Project and the guiding principles of the International Development Research Centre (IDRC) Scaling Approach. In his remarks, Dr Efitre emphasized the importance of high-quality data in tracking progress, informing adaptive management, and scaling impact.
NutriFishPlus builds on the significant achievements of the ground-breaking NutriFish Project (2019–2023), which was funded by IDRC and the Australian Centre for International Agricultural Research (ACIAR) through the Cultivate Africa’s Future Fund Phase II (CultiAF2). Officially launched on 28th October 2025, the two-year and eight-month project seeks to scale proven innovations while deepening nutrition, livelihood, and gender outcomes within small pelagic fisheries.
The project aims to:
- Scale up the adoption of improved and sustainable fish processing technologies, including solar tent driers and raised racks, to reach new fishing communities across Uganda.
- Enhance market access and strengthen supply chain linkages for high-quality fish and fish-based products.
- Empower women and other vulnerable groups while strengthening community resilience through diversified income-generating activities.
Expected Outcomes:
NutriFishPlus is expected to deliver multiple socioeconomic and environmental benefits, including:
- Improved incomes and livelihoods for marginalized fishing communities, particularly women and youth.
- Enhanced health and nutrition outcomes through the development of diversified, market-embedded fish products.
- Establishment of sustainable and replicable fish processing and marketing models across Uganda and the wider East African region.
- Increased participation of women and youth in decision-making and benefit-sharing within the Small Pelagic Fishes (SPFs) value chain.
- Improved socioeconomic conditions and ecosystem health through participatory and scalable approaches.
Project Implementation and Partnerships
The project is implemented by the Department of Zoology, Entomology, and Fisheries Sciences at Makerere University, in partnership with Nutreal Ltd and Kati Farms Ltd under a public-private partnership. Project activities will be carried out at five landing sites across Lakes Victoria, Kyoga, and Albert.
The project team comprises:
- Dr. Jackson Efitre (Principal Investigator)
- Dr. Dorothy Nakimbugwe (Co-PI from Nutreal Ltd)
- Ms. Lovin Kobusingye (Co-PI from Kati Farms Ltd)
- Dr. Robinson Odong (Project Officer, Department of Zoology, Entomology and Fisheries Sciences, Makerere University)
- Ms. Juliet Ogubi Nafula (M&E Expert)
- Ms. Nelly Badaru (Gender Specialist)
- Mr. Eugene Swinnerstone Miheso (IT Expert)
- Mr. Maurice Ssebisubi (Kati Farms Ltd)
- Ms. Hasifa Kabejja (Communication Officer)
- Ms. Eve Akongo Ampa (Project Administrator)
Strengthening MEL and Data Quality
During the training workshop, Ms. Juliet Ogubi Nafula guided the team through the NutriFishPlus MEL framework, highlighting its objectives, indicators, results chain, and reporting requirements. Particular emphasis was placed on the role of high-quality data in facilitating project learning, adaptive management, and accountability to donors and beneficiaries.
A key highlight of the training was a hands-on orientation to the household survey tool, led by Mr. Eugene Swinnerstone Miheso. Participants were taken through the structure of the questionnaire, which covers household demographics, nutrition and dietary diversity, fish consumption, livelihoods, value addition, gender dynamics, and food security. Practical sessions enabled the research assistants to practice administering the tool, apply effective probing techniques, and address common field-level challenges.
The training underscored critical ethical considerations in household data collection, including informed consent, confidentiality, and respectful engagement with respondents. Data quality assurance measures such as accurate data recording, use of digital data collection platforms, and daily review protocols were discussed to ensure consistency and reliability.
In his closing remarks, Dr. Efitre emphasized that well-trained research assistants are central to generating credible evidence that reflects the lived realities of beneficiary households. “This training is a vital investment in strengthening our MEL system and ensuring that the evidence we generate informs learning, accountability, and improved project outcomes,” he noted.
The participants expressed gratitude for the interactive and practical nature of the training, noting that the sessions significantly enhanced their confidence and readiness for fieldwork. The training concluded with a question-and-answer session and a brief assessment to confirm participants’ understanding of the MEL framework and household survey tool.
Pre-testing of the household survey tool
Following the training, the project team conducted a pre-test of the household survey tool at Kasenyi Landing Site in Entebbe on 19th January 2026, ahead of the baseline survey. The baseline data collection will be carried out across five landing sites: Katosi (Mukono District), Kikondo (Buikwe District), Bangaladesh and Kayago (Amolatar District), and Dei (Pakwach District), spanning Lakes Victoria, Kyoga, and Albert.
Details on the project at: https://news.mak.ac.ug/2025/10/mak-conas-launches-nutrifishplus-project/
Dr Oruru Bosco has been appointed Acting Head of the Department of Physics at the College of Natural Sciences (CoNAS), Makerere University effective 1st January 2026. Dr Oruru takes on from Dr Okello Denis who has served in the same position since January 2022. He becomes the 10th Head of Department since its establishment. His predecessors include Prof. David Thomson, Prof. John Odeke Ilukor, Prof. Eldad J.K. Banda, Prof. Ezra K.S. Mugambe, Prof. Yusto Kaahwa, Prof. Ezra M. Twesigomwe, Prof. Florence Mutonyi D’ujanga, Prof. Winston Tumps Ireeta, and Dr. Denis Okello.
Dr. Oruru holds a PhD in Physics from the University of the Free State, South Africa, an MSc in Physics from the University of the Free State, a BSc in Astrophysics and Space Science from the University of Cape Town, a BSc in Education (Physics and Mathematics) from Mbarara University of Science and Technology, a Postgraduate Diploma in Public Administration and Management from Uganda Management Institute, and a Diploma in Secondary Education (Physics and Chemistry) from the Institute of Teacher Education, Kyambogo.
He has served the Department in various capacities as a Lecturer, Senior Lecturer, Graduate Supervisors Trainer, and Secretary of the Departmental Research and Teaching Programmes Committee. Dr. Oruru has supervised and examined several PhD, MSc, and BSc students at Makerere and other institutions, including Kyambogo University, Mbarara University of Science and Technology, the South African Institute of Physics, and the University of the Free State. His research interests include accretion onto magnetized compact objects (e.g., X-ray binaries and cataclysmic variables), exotic phenomena such as gamma-ray bursts, supernovae explosions, and active galactic nuclei, African cultural astronomy, and radiation physics.
At the handover ceremony held today, 6th January 2026, Dr. Denis Okello congratulated Dr. Oruru on his appointment and expressed gratitude to the College and University administration for the support accorded to him during his tenure. He also thanked the department staff for their cooperation and commitment. “The support I received enabled me to serve successfully and build upon the achievements of my predecessors. I leave the Department in a much improved state, with well-established infrastructure, including a lecture theatre, classrooms, teaching, research, and ICT laboratories, as well as a departmental library stocked with textbooks relevant to our programmes.”
During his tenure, Dr. Okello oversaw the review of the Bachelor of Science programmes (BSCI and BSCX) to align with the competence-based curriculum. The Department also acquired 55 computers through government funding, in addition to three iPads donated through the College. Renovations were carried out on the interior and exterior of the Department. Staffing improved, with 17 teaching staff currently in place out of the approved 27 positions. Recruitment efforts continue to fill the vacant positions.
Dr Okello appealed to staff to continue working together to further strengthen the department, and pledged support to the new head.
In his remarks, Dr Oruru thanked the staff and university management for entrusting him with the leadership of the Department. ““I am delighted to work alongside a team of dedicated professionals who understand their responsibilities and remain focused on our shared goals. I step into this position not merely as a leader, but as a representative of an exceptional team. With the guidance and support of my predecessors, I am confident that we will continue to uphold and build upon the department’s tradition of excellence.
The Dean, School of Physical Sciences, Dr Michael Owor commended both outgoing and incoming Heads for their commitment to the growth and success of the Department.
Natural Sciences
Jinja Fish Festival: Mak Recognized for its outstanding contribution to the Development of the Fisheries Sector
Makerere University, through the College of Natural Sciences (CoNAS), has been recognized for its outstanding contribution to the development of the fisheries sector in Uganda. The award was presented during the Sustainable Fisheries, Aquaculture, and Environmental Awards Ceremony at the 7th edition of the Jinja Fish Festival, held on 6th–7th December 2025 at Across the Nile Resort, along the banks of the River Nile in Njeru Municipality.
Renowned for showcasing diverse fish cuisines and cultural exhibitions, this year’s festival aimed to promote knowledge exchange, raise awareness, and highlight recent developments around Lake Victoria.
Launched in 2018, the Jinja Fish Festival has become a key platform for the public and stakeholders to learn about sustainable fisheries and the vital role of fish in livelihoods and nutrition. It also provides an avenue for fisheries stakeholders to deliberate on strategies to improve and sustain the sector.
The event includes the Lake Victoria Marathon, Nalubaale boat rowing competitions, a high-level fisheries forum, workshops, and exhibitions. It is organized by the Lake Victoria Fisheries Organization (LVFO) in partnership with the Directorate of Fisheries Resources, Sustainable Fisheries Initiative (SFI), Uganda Fish Processors and Exporters Association (UFPEA), and the International Fish and National Organizing Committee. It is funded by GIZ–SAF Project, the Food and Agriculture Organization (FAO), the International Fund for Agricultural Development (IFAD), and Enabel.
National Fisheries and Aquaculture Forum
A key highlight of the festival was the National Fisheries and Aquaculture Forum, themed “Promoting Sustainable Fisheries and Aquaculture through Ethical and Inclusive Blue Economy Practices.” The forum featured panel discussions on:
- Aligning Uganda’s Blue Economy with global and regional fisheries management frameworks.
- Adoption of climate-smart technologies in fisheries and aquaculture.
- Integration of business strategies and human rights principles into the fisheries and aquaculture value chain.
- Sustainable development of the fisheries and aquaculture sector.
Participants emphasized the importance of strengthening value chain governance, scaling up innovations, and aligning initiatives with youth employment opportunities.
Delivering the keynote address, Mr. Richard Ogutu-Ohwayo, Coordinator at African Lakes Network and Independent Researcher, highlighted the urgent need to address “dirty fish” corruption, improve fisheries resource management through effective policies, and increase human resource capacity within the sector. Dr. Odongokara Konstantine, a Research and Policy Expert, emphasized domesticating international policies into Uganda’s aquaculture practices and building stakeholders’ capacity to access regional and global opportunities.
NutriFishPlus Project Participation in the Festival
The NutriFishPlus Project team, along with students from CoNAS participated in the 7th edition of the Jinja Fish Festival on 6th and 7th December 2025. Led by Ms. Nelly Badaru, Gender Expert on the Project and Ms. Juliet Ogubi Nafula, PhD student in the Department of Zoology, Entomology, and Fisheries Sciences at CoNAS, the team showcased products developed under the project and educated participants on the nutritional benefits of small pelagic fishes.
In its first phase, titled NutriFish, Makerere University researchers, led by Dr. Jackson Efitre, in collaboration with the National Fisheries Resources Research Institute (NaFIRRI – NARO), NUTREAL Limited, and McGill University, Canada, developed five high-value nutritious products, including baby food, sauce, maize meal, snacks, and seasoning, using Mukene (silverfish). The team also published a Mukene recipe book, containing 16 recipes rich in protein, calcium, zinc, and iron.
Through the project, fishers gained access to loans for purchasing boats and fish containers that improve hygiene and product quality. Two enterprise fishing groups, with over 70 boats, were established to ensure consistent supply and standards. Researchers also developed the eCAS system, an application for tracking fish catches. By September 2022, 8,960 catch records had been transmitted through the system, which is now used by over 200 stakeholders, including the Directorate of Fisheries Resources and the Fisheries Protection Unit, helping prevent overfishing.
Other achievements registered under the project included the development of solar tent driers – greenhouse-like structures that reduce the risk of contamination and provide clean and efficient storage and drying, especially during the wet season subsequently reducing post-harvest losses. The project conducted awareness training for 326 people (200 women) to reduce gender inequalities. As a result, domestic violence dropped by 30%, and the number of women in the fish value chain increased. The project also trained eight Graduate students, who have gained valuable skills and knowledge thus boosting critical human resource needs in the fisheries sector.
Other exhibitors at the festival included (NaFIRRI – NARO), FAO, INNOECOFOOD Project at Makerere University, the International University of East Africa, Busitema University, SEETA University (Science, Environment, Engineering, Technology, and Agriculture), Yalelo Uganda, and Preventive Care International, all showcasing emerging technologies and innovations in fisheries.
NutriFishPlus Phase II
Funded by the International Development Research Centre (IDRC) and the Australian Centre for International Agricultural Research (ACIAR) under CultiAF2, the NutriFishPlus Project aims to scale up Phase I activities to further enhance incomes and livelihoods of Uganda’s fishing communities.
Launched on 28th October 2025, the 32-month project will run until March 2028. Its objectives include:
- Scaling up sustainable fishing technologies, including solar tent driers and raised racks, to reach new communities.
- Strengthening market access and supply chain linkages for high-quality fish and fish-based products.
- Empowering women and vulnerable groups through diversified income-generating activities.
Implemented by the Department of Zoology, Entomology, and Fisheries Sciences at Makerere University, in collaboration with Nutreal Ltd and Kati Farms Ltd, the project is led by Dr. Jackson Efitre (Principal Investigator).
Expected outcomes include:
- Improved livelihoods and incomes for marginalized fishing groups, especially women and youth.
- Better health and nutrition through diversified, market-driven fish products.
- Sustainable fish processing and marketing models replicable across Uganda and the East African region.
- Enhanced participation of women and youth in decision-making and benefit-sharing within the Small Pelagic Fishes (SPFs) value chain.
- Strengthened community resilience and ecosystem health through participatory approaches.
Project activities will be conducted at five landing sites around Lakes Victoria, Kyoga, and Albert: Katosi and Kikondo (Mukono and Buikwe districts), Bangaladesh and Kayago (Amolatar District), and Dei (Pakwach District).
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