Yield response of rice (Oryza sativa L.) genotypes to different types of drought under rainfed lowlands: Part 1. Grain yield and yield components |
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| Affiliation: | 1. Ubon Ratchathani Rice Research Center, Ubon Ratchathani, Thailand;2. School of Land and Food Sciences, The University of Queensland, Brisbane, Qld 4072, Australia;3. Chum Phae Rice Experiment Station, Khon Kaen, Thailand;4. The Rockefeller Foundation, Bangkok Regional Office, Bangkok, Thailand;1. Department of Systems Biology, Agricultural Biotechnology Research Institute of Iran (ABRII), Karaj, Iran;2. Leibniz Institute of Plant Genetics and Crop Plant Research (Leibniz-IPK), Corrensstraße 3, 06466 Gatersleben, Germany;1. University of Tasmania, Private Bag 98, Hobart 7001, TAS, Australia;2. Plant Breeding, Genetics and Biotechnology Division, International Rice Research Institute (IRRI), Los Baños, Laguna, Philippines;3. Institute of Crop Science, Sichuan Academy of Agricultural Sciences, Chengdu 610066, Sichuan, China;4. Pingxiang Institute of Agricultural Sciences, Pingxiang 337000, Jiangxi, China;1. Barwale Foundation, Barwale Chambers, #3-6-666, Street No. 10, Himayathnagar, Hyderabad 500029, A.P., India;2. Department of Genetics, Osmania University, Hyderabad, A.P., India;3. Directorate of Rice Research, Rajendranagar, Hyderabad 500030, A.P., India;4. Monsanto India Limited, Udaipur, Rajasthan, India;5. Bayer (South East Asia) Pte Ltd, 108 Pasir Panjang, Singapore 118535, Singapore;6. CDFD, Hyderabad 500001, A.P., India;1. Department of Plant and Soil Sciences, University of Pretoria, Private Bag X20 Hatfield, 0028, South Africa;2. National Agricultural Research Organisation (NARO), Bulindi ZARDI, P.O. Box 101, Hoima, Uganda;1. Department of Agronomy, University of Agriculture, Faisalabad, Pakistan;2. Institute of Agricultural Sciences in the Tropics, University of Hohenheim, 70599, Stuttgart, Germany;3. The UWA Institute of Agriculture, The University of Western Australia, LB 5005, Perth, WA, 6001, Australia;4. Department of Agronomy, Kansas State University, Manhattan, KS, 66506, USA |
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| Abstract: | Responses of rice genotypes to drought stress may be different when characteristics of the drought stress environments differ. The performance of 128 genotypes was examined under irrigation and four different types of drought stress, to determine genotypic consistency in yield and factors determining yields under different drought stress conditions. The different drought conditions were mild drought during grain filling, short and severe drought at flowering, prolonged severe drought during the reproductive to grain filling, and prolonged mild drought during vegetative and grain filling.Genotypic grain yield under mild stress conditions was associated with yield under irrigated conditions, indicating the importance of potential yield in environments where the yield reduction was less than 50%. However, yields under irrigated conditions differed over time and locations.Under prolonged or severe drought conditions, flowering time was an important determinant of grain yield. Earlier flowering genotypes escaped the severe stress and had higher grain yields indicating large genotype by environment (G×E) interactions which have implications for plant breeding even for mild stress. It is suggested that variations in flowering time, potential yields and drought patterns need to be considered for development of drought-resistant cultivars using specific physiological traits. |
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