Plasticity of rice tiller production is related to genotypic variation in the biomass response to elevated atmospheric CO2 concentration and low temperatures during vegetative growth |
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| Institution: | 1. Institute for Genomic Biology, University of Illinois, Urbana, IL 61801, United States;2. Global Change and Photosynthesis Research Unit, USDA/ARS, University of Illinois, Urbana, IL 61801, United States;1. Universidad de Navarra, Grupo de Fisiología del Estrés en Plantas (Dpto. Biología Ambiental), Unidad Asociada al CSIC, EEAD, Zaragoza e ICVV, Logroño, Irunlarrea, 1, 31008, Pamplona, Spain;2. Estación Experimental de Aula Dei (EEAD), CSIC, Dpto. Nutrición Vegetal, Apdo. 13034, 50080 Zaragoza, Spain;3. INRA, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave d’Ornon, France;4. University of Bordeaux, Institut des Sciences de la Vigne et du Vin, UMR1287 EGFV, 210 Chemin de Leysotte, 33883 Villenave d’Ornon, France;1. Institute of Resource, Ecosystem and Environment of Agriculture, and Center of Climate Change and Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing, Jiangsu 210095, China;2. Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, 23 St Machar Drive, Aberdeen AB24 3UU, UK;3. Department of Earth, Atmospheric & Planetary Sciences and the Purdue Climate Change Research Center, Purdue University, West Lafayette, IN 47907, USA;4. Research Department of Agricultural Resources and Environment, Suzhou Academy of Agricultural Sciences, Wangting Town, Suzhou, Jiangsu 215155, China;1. National Key Laboratory of Crop Improvement, Minister of Agriculture 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 Province, 430070, China;2. Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Hubei, China;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: | Appropriate resource partitioning to either production of new tillers or growth of individual tillers is a critical factor for increasing rice biomass production and facilitating adaptation to climate change. We examined the contributions of genotypic variation to the tiller number and individual tiller growth of 24 rice cultivars in response to an elevated atmospheric CO2 concentration CO2] (control + 191 μmol mol?1) and a low air temperature (control minus 4.7 °C) during 56 days of vegetative growth after transplanting. For all genotypes combined, biomass increased by 27% under elevated CO2] and decreased by 34% at low temperature, with a significant genotype × temperature interaction. The increase caused by elevated CO2] resulted from increased tiller number, and the decrease caused by low temperature resulted from decreased growth of individual tillers. Despite the different overall responses to elevated CO2] and low temperature, most of the genotypic variation in biomass at elevated CO2] and low temperature was explained by the responses of tiller number rather than by individual tiller growth. The genotypes with the highest biomass response to elevated CO2] had a smaller reduction of biomass under low temperature. These results highlight the greater importance of genotypic variation in tiller number than in individual tiller growth in the response of biomass to environmental change. |
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