2010•Journal of Yangzhou UniversityRequires access
Study of difference of yield formation in conventional indica rice cultivars with different panicle weight.
Guichun Dong, Jing Ju, Yu Xiaofeng, Zhang Yan, Zhao JiangNing, Li JinQian, Hao Tian, Biao Zhang, Yulong Wang
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Abstract
To investigate the difference and its cause of yield formation in conventional indica rice(Oryza sativa L) cultivars with different panicle weight(PW),a total of 88 and 122 conventional indica rice cultivars were solution-cultured in 2001 and 2002,respectively.Based on PW,these cultivars were classified into 6 types in the alignment from low to high.Growth duration,plant height,dry matter weight(including root),yield and its components,panicle traits,nitrogen content of each plant part and root traits were investigated.Results were as follows: ① For rice cultivars with large PW,growth duration was longer and plant height was higher than those of other rice types.② Rice cultivars with large PW showed the lower maximum tiller number,the percentage of productive tillers and panicles number per unit area, and higher spikelets per ear and 1000-grain-weight than other rice types.③ Rice cultivars with large PW also showed the longer panicle length,higher spikelet density and higher number of primary and secondary branches on the panicles than other rice types,which indicated that on the base of properly increasing of panicle length,the single panicle weight could be elevated through increasing the percentage of secondary branches and improving grain density per panicle.④ Panicle weight showed a quadratic parabola relation with population grain yield and a significant positive linear relationship with grain yield per panicle,which showed that to reach high and stable yield target,those cultivars with moderately larger panicle,higher spikelets per ear and 1000-grain-weight should be considered in the selection and breeding of conventionalindicarice.⑤ The longer growth duration,higher plant height and larger panicle weight were the base forhigh grain yield and the developed root system,more accumulation of nitrogen,larger leaf area index and greater photo-synthetic capacity were the main causes of high grain yield in rice cultivars with large PW.