Chinese Journal OF Rice Science >
Root Traits Affecting Nitrogen Efficient Absorption in Rice Genetic Populations
Received date: 2015-02-09
Revised date: 2015-05-18
Online published: 2015-07-10
To investigate the relationship between root traits and nitrogen accumulation in rice cultivars, a total of 114 chromosome single segment substitution lines (CSSSLs) were solution-cultured in 2010 and 2011. On the basis of nitrogen accumulation per plant and yield per plant at maturity, the CSSSLs were clustered by MinSSw method into six types (namely A,B,C,D,E and F by nitrogen accumulation per plant from low to high). The results shows that: 1)There was a significant difference among all tested lines in N accumulation per plant, the variation ranged from 0.32 g to 0.91 g. The highest N accumulation was 2.58 folds of the lowest. 2)Both N accumulation and nitrogen use efficiency for grain production were important contributors to yield formation, but the former exhibited higher contribution. With higher nitrogen accumulation, grain yield tended to increase, but nitrogen accumulation types and grain yield types were not always associated. 3)Higher nitrogen accumulation is an important basis of higher yield, but yield was also affected by other factors. 4)The differences in root activity traits (including the total root absorption area, the root active absorption area and the root activity) among rice cultivars were limited, but the root morphological traits(including total length of adventitious roots, root dry weight, the maximum root length and plural root length) and the ratio of shoot to root showed significant differences. The total length of adventitious roots per plant, root dry weight per plant, the maximum root length, plural root length and the ratio of shoot to root of higher nitrogen efficiency and yield types were significantly larger than those of lower nitrogen efficiency and yield types. 5) Correlation analysis, principal component analysis and path analysis revealed that main traits influencing nitrogen accumulation in the rice population were root dry weight per plant, the ratio of shoot to root at heading stage, the maximum root length and total length of adventitious roots per plant. Improving the root morphological traits through genetic approaches might significantly enhance nitrogen accumulation efficiency in rice plants.
Chen CHEN, Bin YANG, Zheng-kang ZHU, Wen-ya CAO, Gang LUO, Juan ZHOU, Xiang-ju WANG, Xiao-feng YU, Qiu-mei YUAN, Jun ZHONG, Yi WANG, Jian-ye HUANG, Yu-long WANG, Gui-chun DONG . Root Traits Affecting Nitrogen Efficient Absorption in Rice Genetic Populations[J]. Chinese Journal OF Rice Science, 2015 , 29(4) : 390 -398 . DOI: 10．3969/j．issn．1001G7216．2015．04．08
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