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《Acta Agronomica Sinica》 2013-01
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Characteristics of Dry Matter Accumulation and Translocation in Rice Cultivars with High Yield and High Nitrogen Use Efficiency

LI Min 1,2 , ZHANG Hong-Cheng 2, YANG Xiong 2 , GE Meng-Jie 2 , MA Qun 2 , WEI Hai-Yan 2 , DAI Qi-Gen 2 , HUO Zhong-Yang 2 , and XU Ke 2 1 Rice Research Institute of Guizhou Province, Guiyang 550006, China; 2 Innovation Center of Rice Technology in Yangtze Rice Valley, Ministry of Agriculture, Yangzhou University, Yangzhou 225009, China  
The difference of dry matter production and translocation characteristics in low-yielding and low N-efficiency, high-yielding and medium N-efficiency, high-yielding and high N-efficiency rice cultivars was investigated using six representative japonica varieties under their optimum N supply levels, respectively. The results indicated that: with the increase of rice productivity, the total dry matter production amount significantly increased by 20.29% on average, and the dry matter accumulation amount and population growth rate increased on average by 15.05%, 27.04%, 24.75% and 15.05%, 28.38%, 23.00%, during the period before N-n (critical stage of productive tillering), from jointing to heading, and from heading to maturing, respectively, and decreased during the period from N-n to the jointing. Among the high-yielding varieties, with the nitrogen use efficiency increased, the tiller number per unit area at each growth stage showed a downward trend, and significantly reduced on average by 5.76%, 11.61%, 7.01%, and 5.70% at N-n, jointing, heading and maturing, respectively, but ratio of productive tillers to total tillers significantly increased. At each growth stage, the dry matter accumulation amount showed a declined tendency, and reduced on average by 12.18%, 10.54%, 8.29%, and 5.01% at N-n, jointing, heading and maturity, respectively, but harvest indexsignificantly increased. During the period from heading to maturing, dry matter accumulation rate increased on average by 5.40%, the population growth rate increased on average by 5.19%. The results above showed that proper control for population growth before heading, maintaining a high growth rate after heading and a higher harvest index were the important dry matter accumulation characteristics of the cultivars with high-yielding and high nitrogen use efficiency.
【Fund】: 国家自然科学基金项目(30971732 31101102);; 国家粮食丰产科技工程项目(2011BAD16B03);; 贵州省科技计划项目(黔科合NY字[2012]3043);; 贵州省水稻育种、栽培与产业化创新能力建设项目(黔科合院所创能合[2011]4003);; 贵州山区水稻科研基础条件建设项目(黔科条中补地[2011]4005);; 贵州科技重大专项计划项目(黔科合重大专项字[2011]6012-2);; 贵州省科技成果重点推广计划项目(黔科合成字[2012]5019)资助
【CateGory Index】: S511
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