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Discovery of and Preliminary studies on a Rapid-Leafing Rice Genotype at the vegetative growth stage

Rice science 2008年第1期15卷 29-35页

作者： MAO Hai-yan PAN Cun-hong CHEN Zong-xiang ZHANG Ya-fang Zuo Shi-min CHENG Jin-rong PAN Xue-biao Key Laboratory of Crop Genetics and Physiology of Jiangsu Province~Key Laboratory of Plant Functional Genomics of Ministry ofEducation of China Yangzhou University Yangzhou 225009 China

The leafing rates of fourteen rice varieties were measured in a sowing-time experiment, and a rapid leafing genotype at the vegetative growth stage was discovered in an indica variety Yanhui 559. The leaf number on the main culm of Yanhui 559 was always 4-5 leaves more than that of Lemont, and the leafing rate of Yanhui 559 was significantly higher than that of Lemont based on similar growth durations from sowing to heading. Furthermore, the difference of the leafing rate was significant at the vegetative growth stage, but not distinctive at the panicle initiation stage. Genetic analysis of the leafing rates in the two backcross populations of Yanhui 559 and Lemont showed that major and quantitative genes controlled the expression of rapid leafing character. Based on results of investigation for some plants with similar growth durations in the backcrossing populations, the rapid leafing genotypes exhibited earlier tillering and more tiller numbers per plant, and its yield components including the number of panicles per plant and number of grains per panicle were superior to those of the slow leafing genotypes. Further research and application feasibility of the rapid leafing genotype in breeding were discussed.

关键词： rapid leafing vegetative growth stage leaf number on the main culm number of panicles per plant rice

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