Chinese Journal OF Rice Science >
Fundamental Features of Source-Sink Characters and Their Regulation in High Nitrogen Efficiency Rice Lines
Online published: 2017-03-10
【Objective】In order to reveal the features of the source-sink in N-efficient rice,【Method】we conducted two experiments from 2012 to 2014 in paddy fields. A chromosome single segment substitution lines (CSSSLs) consisted of 114 rice lines were cultured in 2012 and 2013. On the basis of plant nitrogen accumulation per area and yield per area at maturity, the rice cultivars were clustered into six types by MinSSw (Minimum Square Sum Within Groups) method. We selected two lines, one is featured with high nitrogen accumulation and high yield (L68, nitrogen-efficient), the other with low nitrogen accumulation and low yield (L2, nitrogen-inefficient). The effects of nitrogen application levels on yield and source-sink characters were studied. 【Result】1) There was a significant difference among all tested lines in N accumulation per unit area and yield per unit area, the variation of N accumulation per unit area ranged from 11.53 to 27.66 g/m2, the variation of yield per unit area from 311.74 to 763.35 kg/666.7 m2. With the increase of nitrogen accumulation, grain yield tended to increase, but nitrogen accumulation types and the yield types were not completely similar. High nitrogen accumulation is an important basis of high yield, but yield was also affected by other factors; 2) The LAI at heading stage (including valid, efficient and total LAI) and mature stage of the N-efficient rice were higher than that of the N-inefficient. The green leaf weight which is the components of leaf area of N-efficient rice was higher than that of N-inefficient rice, but the specific leaf weight had little difference in different N-efficiency rice. 3) The storage capacity per unit area and spikelet number per unit area of N-efficient rice were higher than those of N-inefficient rice. The storage capacity per unit dry weight, storage capacity per unit leaf area, storage capacity per unit nitrogen absorption of N-efficient rice were large, and their ability of developing storage capacity was strong; 4) The spikelet numbers per unit leaf area, grain yield per unit leaf area and net assimilation rate at seed setting stage of N-efficient rice were large, and their “flux” was fluent and the photosynthetic capability was strong; 5) Comprehensive analysis shows that, the storage capacity had a large influence on the nitrogen efficient absorption, and the increasing storage capacity per unit nitrogen absorption contributed to increase in the storage per unit area. Under different nitrogen application levels, the LAI, storage capacity, N absorption and yield of N-efficient rice were higher than those of N-inefficient rice significantly. Under low nitrogen level, the LAI difference between two different N efficiency rice was maximum, nevertheless the differences of the other three indicators were larger under condition of low and medium nitrogen. 【Conclusion】The source-sink properties of N-efficient rice are better than other types at different N application levels.
Key words： N-efficient rice; N application level; N accumulation; yield; source-sink
Chen CHEN, Jiaxing ZHANG, Wanyuan LI, Dongnan TANG, Gang LUO, Xiangju WANG, Lanjing MO, Minjia LÜ, Juan ZHOU, Guohua LIANG, Jianye HUANG, Yulong WANG, Youli YAO, Gui-chun DONG . Fundamental Features of Source-Sink Characters and Their Regulation in High Nitrogen Efficiency Rice Lines[J]. Chinese Journal OF Rice Science, 2017 , 31(2) : 185 -194 . DOI: 10.16819/j.1001-7216.2017.6127
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