Some Related Traits in Conventional indica Rice Cultivars with High Nitrogen Use Efficiency for Grain Yield
DONG Guichun, LI Jinqian, ZHANG biao, ZHOU Juan, ZHANG Chuansheng, ZHANG Yuefang, YANG Lianxin, HUANG Jianye, WANG Yulong*
Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Lower Reaches of Yangtse River of Ministry of Agriculture, Yangzhou University, Yangzhou 225009, China
Abstract:
Eightyeight and one hundred and twentytwo conventional indica rice cultivars were solutioncultured in 2001 and 2002, respectively. Dry matter weight (including root system, culm and sheath, leaves and panicle), nitrogen content of different organs, yield and its components, growth duration, plant height, percentage of productive tillers and spikelet traits were investigated. The tested rice cultivars were classified into six types based on their levels of nitrogen use efficiency for grain output (NUEg) by the MinSSw method, to study their difference in growth duration, plant height, percentage of productive tillers and panicle traits. Cultivars with higher NUEg showed shorter growth duration especially days from sowing to heading, and NUEg was negatively correlated with days from sowing to heading. No significant relation between NUEg and plant height was found. The cultivars with higher NUEg had higher percentage of productive tillers which was closely correlated with translocation of dry matter and nitrogen. The spikelet density was higher while panicle length was shorter in cultivars with higher NUEg.
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