Yield and grain uniformity in contrasting rice genotypes suitable for different growth environments |
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| Institution: | 1. Department of Agronomy, Taiwan Agricultural Research Institute, Taichung 413, Taiwan;2. Department of Agronomy, National Chung Hsing University, Taichung 402, Taiwan;3. Department of Food Science and Nutrition, Hung Kuang University, Sha Lu, Taichung 433, Taiwan;1. Department of Crop Science and Technology, College of Agriculture, South China Agricultural University, Guangzhou, 510642, PR China;2. Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture, Guangzhou, 510642, PR China;1. Rice Research Institute, Shenyang Agricultural University/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern japonica Super Rice Breeding, Ministry of Education, Shenyang 110866, P.R.China;2. Liaoning Academy of Agricultural Sciences, Shenyang 110161, P.R.China;3. Laboratory of Plant Breeding, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan;1. CIRAD, UMR AGAP, F-34398 Montpellier, France;2. International Rice Research Institute (IRRI), Crop and Environment Science Division (CESD), DAPO Box 7777, Metro Manila, Philippines;3. Bayer CropScience NV, Innovation Center, Technologie park 38, B-9052 Gent, Belgium;1. CIMMYT-India, 9th Floor Aggarwal Towers, New Delhi, India;2. International Rice Research Institute, DAPO 7777, Metro Manila, Philippines;3. CSIRO Agriculture Flagship, Dutton Park, Brisbane, Australia;1. National Key Laboratory of Crop Genetic Improvement, MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, China;2. Department of Agriculture, Abdul Wali Khan University Mardan, 23200 Khyber Pakhtunkhwa, Pakistan;3. College of Economics and Land Management Huazhong Agricultural University, Wuhan, Hubei 430070, China;4. National Key Laboratory of Crop Improvement and Genetics, Huazhong Agricultural University, Wuhan, Hubei 430070, China |
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| Abstract: | In this study, the effect of crop season on yield and grain weight uniformity was examined in field-grown rice cultivar Tainung 67 and its sodium azide-induced mutant SA419 in 2000 and 2001. In spring, Tainung 67 had greater yield (7.2 mg ha−1) than SA419 (6.2 mg ha−1). Marked yield decline (averaged 27% decline) was found in Tainung 67 when it was grown in autumn. The yield decline resulting from season change was only 5.9% for SA419. The greater yield of SA419 than Tainung 67 in autumn was due to its higher net assimilation rate and better dry matter partitioning during grain filling. The distribution patterns of grain weight differed between the tested genotypes, with greater grain weight variations for Tainung 67 than SA419. Significant panicle branch effects on the distribution pattern of grain weight were also found between Tainung 67 and SA419 with greater variation for the former than the latter. SA419 has several agronomic traits, such as heavier 1000-grain weight and more uniform grain development within a panicle, that makes it a genotype with superior grain quality than Tainung 67. |
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