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Research on High Yield Breeding of Super Early Indica Rice “Zhongzao 39” |
Zhi-juan JI,Yu-xiang ZENG,Yan LIAN,Chang-deng YANG() |
State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China |
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Abstract Early Indica rice variety “Jiayu 253” and “Zhongzu 3” were used as parents to breed a new variety “Zhongzao 39” through pedigree method and yield comparison trial. Natural disease nursery and artificial inoculation of mixed strains of blast for each segregation generation were conducted. The variety “Zhongzao 39” and its pedigree parents “Jiayu 253” and “Zhongzu 3” were further compared on yield related traits, photosynthetic characters, leaf area indexes and photosynthetic pigment contents. Results showed that total grain number per panicle and seed setting rate of Zhongzao 39 were higher than that of its pedigree parents, indicating its excellent sink. The highest net photosynthetic rate of Zhongzao 39 was demonstrated 20 days after the stage of full heading stage. Its leaf area index and photosynthetic pigment content were showed the most high as well. Therefore, Zhongzao 39 demonstrated elite photosynthetic physiological characters for high yield. Using high-yield pedigree parents in breeding and integration of elite traits during breeding contribute to the high-yield of Zhongzao 39. The super high yield advantage is obtained from source sink optimization, improvement of plant leaf morphology and performance of late-stage vigor super hybrid rice characters during rice breeding, which gives reference information for rice high-yield breeding.
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Received: 30 November 2016
Published: 16 December 2017
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