Comparison of Different Yield Levels and Yield Formation Characteristics and Differences of Indica Hybrid Rice under Direct-Sowing
GUO Chang-chun;HE Yan;SUN Yong-jian;YAN Feng-jun;WANG Hai-yue;YANG Zhi-yuan;XU Hui;YIN Yao-zhu;YAN Tian-rong;MA Jun;Rice Research Institute of Sichuan Agricultural University/Key Laboratory of Crop Physiology,Ecology,and Cultivation in Southwest,Ministry of Agriculture;
【Objective】In order to explore common characteristics suitable for direct sowing high yield hybrid indica rice varieties,and provide theoretical and practical basis for screening applications directsowing indica hybrid rice cultivars.【Method】29 different indica hybrid rice cultivars were used as materials,and analysis the effects of different hybrid indica rice population quality and yield during filling stage,and explored to correlation of population quality and yield under artificial direct-sowing.【Results】According to cluster analysis of yield,the results showed that there was an obvious significant difference in five yield classification types on grain yield,leaf shape,lodging resistance,and dry matter accumulation and transportation in different vegetative organs,within Nei 7 you 39,F you 498,Lvyou 4923,Jing 3 you 177 and Nei 5 you 979 is higher than other varieties of grain yield(9 825.2~10 879.2 kg/hm~2).The main reason is that high and medium-high yield type cultivars on effective panicle,filled grains per panicle,seed-setting rate,flag leaf length,plant height,dry matter accumulation,and leaf area index(LAI)were significantly higher than other yield levels.Especially from heading to maturity stage their flag leaf,2 nd leaf from top,3 rd leaf from top leaf angle were relatively small,which could improve the light and light posture in the middle and lower part of the rice plant,which could enhance the dry matter accumulation and increase the total spikelets.Also for high yield and medium-high yield cultivars is stronger between the basal internodes lodging resistance,thus contributing to high yield,are common characteristics direct-sowing indica hybrid rice,also broadcast high-yield,medium-high yield cultivars in relation to other important reasons to increase grain yield cultivars.The correlation analysis showed that there was a significant negative correlation between the yield of hybrid indica and top three leaf,and had significant positive correlation with LAI,flag leaf length,breaking resistance,dry matter accumulation and transport,especially the positive correlation between leaf transport rate and grain yield was the highest(r=0.76**).【Conclusion】In the maturity stage,the top three leafs were compact and upright,and the LAI was high,the lodging resistance was strong,and the high transfer rate of the leaf material was the common physiological characteristics of the high yield and medium-high yield of the indica hybrid rice.
【Fund】： 国家重点研发计划项目(2016YFD0300506);; 国家科技支撑计划项目(2013BAD07B13)
【CateGory Index】： S511.21
【CateGory Index】： S511.21