首页|Artificial selection of the Green Revolution gene Semidwarf 1 is implicated in upland rice breeding
Artificial selection of the Green Revolution gene Semidwarf 1 is implicated in upland rice breeding
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国家科技期刊平台
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NSTL
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Semidwarf breeding has boosted crop production and is a well-known outcome from the first Green Revolution.The Green Revolution gene Semidwarf 1(SD1),which modulates gibberellic acid(GA)biosynthesis,plays a principal role in determining rice plant height.Mutations in SD1 reduce rice plant height and promote lodging resistance and fertilizer tolerance to increase grain production.The plant height mediated by SD1 also favors grain yield under certain conditions.However,it is not yet known whether the function of SD1 in upland rice promotes adaptation and grain production.In this study,the plant height and grain yield of irrigated and upland rice were comparatively analyzed under paddy and dryland conditions.In response to dryland environments,rice requires a reduction in plant height to cope with water deficits.Upland rice accessions had greater plant heights than their irrigated counterparts under both paddy and dryland conditions,and appropriately reducing plant height could improve adaptability to dryland environments and maintain high grain yield formation.Moreover,upland rice cultivars with thicker stem diameters had stronger lodging resistance,which addresses the lodging problem.Knockout of SD1 in the upland rice cultivar IRAT104 reduced the plant height and grain yield,demonstrating that the adjustment of plant height mediated by SD1 could increase grain production in dryland fields.In addition,an SD1 genetic diversity analysis verified that haplotype variation causes phenotypic variation in plant height.During the breeding history of rice,SD1 allelic mutations were selected from landraces to improve the grain yield of irrigated rice cultivars,and this selection was accompanied by a reduction in plant height.Thus,five known mutant alleles were analyzed to verify that functional SD1 is required for upland rice production.All these results suggest that SD1 might have undergone artificial positive selection in upland rice,which provides further insights concerning greater plant height in upland rice breeding.
Green RevolutionSemidwarf 1high-yield breedingupland riceplant height
Key Laboratory of Biology and Germplasm Innovation of Perennial Rice,Ministry of Agriculture and Rural Affairs/School of Agriculture,Yunnan University,Kunming 650091,China
State Key Laboratory of Crop Gene Resources and Breeding,Institute of Crop Sciences,Chinese Academy of Agricultural Sciences,Beijing 100081,China
Wenshan Academy of Agricultural Sciences,Wenshan 663000,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYunnan Provincial Science and Technology Department,ChinaYunnan Provincial Science and Technology Department,China
国家科技期刊平台
NSTL
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