Scientists’ breakthrough brings hope for banana resistance breeding to deadly bacterial wilt disease
A team, led by scientists from the International Institute of Tropical Agriculture (IITA), have announced a breakthrough in the search for banana varieties that are resistant to the lethal bacterial wilt disease. This debunks the notion that all banana varieties are susceptible to the disease and opens the possibility of breeding resistant varieties.
The bacterial wilt disease, which causes premature ripening and rotting of the fruits, wilting, and eventually death of the plant, has drastically affected the highland cooking banana production in East and Central Africa (ECA) and the food and income of millions of farmers.
Until now, the scientific world believed that all banana varieties in the region, except for a wild-seeded banana called Musa balbisiana, were susceptible to the disease, which originated from Ethiopia and has now invaded all banana growing areas in the highlands of eastern and central Africa.
The discovery by the team led by Prof Rony Swennen, Head of banana breeding; Dr George Mahuku, Senior Plant Pathologist for Eastern, Southern and Central Africa; and Dr Valentine Nakato, Plant Pathologist, was reported in the Plant Pathology (https://doi.org/10.1111/ppa.12945) journal.
The bacterial wilt disease is caused by Xanthomonas campestris pv. musacearum bacteria and its symptoms include yellowing and wilting of leaves, a cream to pale yellow bacteria-laden oozing when the plant is cut, shriveling of the male bud, premature ripening, internal discoloration of fruits, and finally death of infected plants. Transmission is fast and mainly through contaminated tools, insect vectors, and planting material. Therefore, major investments by national programs, donors, and scientists have been geared towards rigorous monitoring of banana fields, removal of diseased plants, and decontaminating farm tools.
“This discovery is very important for the millions of smallholder banana farmers in the region as one of the most effective ways to control any disease is by developing resistant varieties,” says Nakato, based in IITA, Uganda.
Bananas are an indispensable part of life in the region providing up to one-fifth of the total calorie consumption per capita. The average daily per capita energy from banana consumption in ECA is 147 kcal: 15 times the global average and six times the African average. The region has over 50% of its permanent cropped area under banana; this is around half of the total area under banana cultivation across Africa. ECA countries (Burundi, DR Congo, Kenya, Rwanda, Tanzania, and Uganda) produce annually 21 million tons of banana with a value of USD4.3 billion.
The team systematically screened the entire banana collection at IITA, Uganda, and identified 13 other sources of resistance next to M. balbisiana. Most importantly, Nakato identified several diploids derived from Musa acuminata—another wild banana—and which are already part of the existing highland breeding program of IITA and NARO (National Agricultural Research Organisation, Uganda).
“The findings of this study are very significant for the banana breeding community and we will redouble our efforts in developing banana varieties with resistance to banana bacterial wilt disease,” says Swennen.
IITA and NARO have developed superior high-yielding matoke hybrids dubbed NARITA and now those NARITA, which were developed with the resistant banana varieties, will be screened for bacterial wilt resistance and become part of future breeding schemes to develop bacterial wilt resistant matoke varieties.
Other partners in the study included the University of Pretoria, South Africa and Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany, Academy of Sciences of the Czech Republic. This research was undertaken as part of the CGIAR Research Program on Roots, Tubers and Bananas.
Hits: 112https://farmerstrend.co.ke/bacterial-banana-wilt-disease/https://i2.wp.com/farmerstrend.co.ke/wp-content/uploads/2018/10/bacterial-wilt-disease.jpg?fit=768%2C249&ssl=1https://i2.wp.com/farmerstrend.co.ke/wp-content/uploads/2018/10/bacterial-wilt-disease.jpg?resize=150%2C150&ssl=1#TrendingA team, led by scientists from the International Institute of Tropical Agriculture (IITA), have announced a breakthrough in the search for banana varieties that are resistant to the lethal bacterial wilt disease. This debunks the notion that all banana varieties are susceptible to the disease and opens the possibility...#FarmersTrendJohn Bujufarmerstrend@gmail.comAdministratorI am a web enthusiast, writer and blogger. I always strive to be passionate about my work. I started my work at the beginning of 2013 by engaging myself with detail reading and exchanging information regarding farming with others. Since then things and times have changed, but one thing remains the same and that is my passion for helping and educating Kenyan farmers, building a successful blog and delivering quality content to the readers. The particular interests that brought me in the world of blogging are gardening, farming and livestock.Farmers#Trend