中国农业科学2011，Vol.44Issue(21)：4358-4366,9.
影响粳稻品种吸氮能力的根系性状
Root Traits Affecting N Absorptive Capacity in Conventional Japonica Rice
摘要
Abstract
[Objective] The objectives of the study were to investigate the evolution trends and diversities of root traits in conventional japonica rice cultivars of different N accumulation types, define the root traits of japonica rice cultivars with high N accumulation, and to provide experimental evidence for genetic improvements of root traits in conventional japonica rice cultivars. [Method] A total of 94 conventional japonica rice cultivars were solution-cultured in 2008 and 2009. Morphological and physiological traits of root, dry weight and N concentration of rice plant, grain yield and its components were measured. Then, the tested rice cultivars were clustered into 6 types based on their N accumulation at maturity by MinSSw method, and the differences in root and other traits between the types were analyzed. [Result] There was a significant difference among all tested cultivars in N accumulation. The highest N accumulation was 2.94 and 2.59 times as the lowest in 2008 and 2009, respectively. The average yields of japonica rice cultivars with high N accumulation were significantly higher than those with low N accumulation. Both growthduration and nitrogen uptake intensity were the main factors influencing N accumulation, but the influence of nitrogen uptake intensity to N accumulation was bigger. There were significant differences in root dry weight per plant, total length of adventitious roots per plant, total root absorption area per plant and root activity absorptions per plant of different types of japonica rice cultivars. The number of adventitious roots per plant and root activity per plant varied in different years. The root traits of cultivars with high N accumulation, including the number of adventitious roots per plant, root dry weight per plant, total length of adventitious roots per plant, total root absorption area per plant, root activity absorptions per plant and root activity per plant, were superior to those with low N accumulation. High accumulation could be reached by improving root dry weight per plant, ratio of shoot to root, total length of adventitious roots per plant and root dry weight per adventitious. [ Conclusion ] There is a significant difference among all tested cultivars in N accumulation. Nitrogen uptake intensity is an important factor for N accumulation. The root traits of cultivars with high N accumulation, including the number of adventitious roots per plant, root dry weight per plant, total length of adventitious roots per plant, the total root absorption area per plant, the root activity absorptions per plant and root activity per plant, are superior to those with low N accumulation, root dry weight per plant, the ratio of shoot to root, the total length of adventitious roots per plant and dry weight per adventitious are the main factors influencing N absorptive capacity.关键词
粳型水稻/品种/吸氮量/根系形态/根系活力Key words
japonica rice/ cultivars/ N accumulation/ root morphology/ root activity引用本文复制引用
于小凤,董桂春,李进前,田昊,彭斌,张燕,王熠,袁秋梅,黄建晔,王余龙..影响粳稻品种吸氮能力的根系性状[J].中国农业科学,2011,44(21):4358-4366,9.基金项目
国家自然科学基金项目(30971728,30771275)、江苏省高校自然科学重大基础研究项目(09KJA210001) （30971728,30771275）
