Faculty of Agriculture Department of Plant-bioscience
Professor SHIMONO Hiroyuki
A collaborative research team consisting of Professor Hiroyuki Shimono of the Faculty of Agriculture, Department of Plant Life Sciences, Iwate University, Researcher Mr. Habtamu Assega Alemayehu of the Ethiopian Institute of Agricultural Research, and Researcher Dr. Akira Abe of the Iwate Bioengineering Research Center has been evaluated firstly 18 Ethiopian local rice cultivars of cold tolerance for inducing male sterility induced by low temperatures during the reproductive stage. This result is expected to promote future breeding of new varieties adapting the low temperature conditions in Ethiopia. Iwate University is contributing to SDGs of sustainable food production at the forefront of agricultural fields in Africa.
The results of this research were published in the international academic journal Field Crops Research on March 1, 2021.
Open access: https://www.sciencedirect.com/science/article/pii/S0378429020313265
Male sterility induced by low temperatures during reproductive development is the major constraint on rice production in Ethiopia, which generally lies at high elevations. Because of a lack of phenotyping facilities, limited information is available on the cold tolerance of Ethiopian germplasm. We evaluated the genotypic variation in cold tolerance of 18 Ethiopian rice cultivars in two phenotyping facilities and characterized their cold tolerance in relation to their reproductive morphology in a 2-year trial in Japan. Genotypic variation in spikelet fertility was high after exposure to cold during reproductive development at both facilities, with fertility ranging from 0% to 90 %. 'Andassa' and 'Tana' had the highest fertility and 'Fogera 2' and 'Getachew' had the lowest. The two cold-tolerant germplasms had tolerance similar to that of the Japanese 'Hitomebore' (strong), whereas the susceptible germplasms had tolerance similar to that of the Japanese 'Sasanishiki' (weak). The variation in spikelet fertility was explained by both anther length and number of fertile pollen grains per anther under cold stress, and by anther length under unstressed control conditions in both years of the study; longer anther length and higher fertile pollen number leads to stronger cold tolerance. Our results suggest that anther length under unstressed conditions offers a pre-screening criterion for cold tolerance without requiring phenotyping facilities for screening.