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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (12): 1817-1826.doi: 10.3724/SP.J.1006.2016.01817

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Characterization of Populations with Different Yield Levels in Indica Hybrid Rice in Plateau Area of Guizhou Province

LUO De-Qiang1,2,WANG Shao-Hua1,*,JIANG Xue-Hai2,LI Gang-Hua1,ZHOU Wei-Jia2,LI Min2,JI Guang-Mei2,DING Yan-Feng1,LING Qi-Hong1,LIU Zheng-Hui1   

  1. 1 College of Agricultural of Nanjing Agricultural University / Key Laboratory of Crop Physiology and Ecology in Southern China, Nanjing 210095, China; 2 Rice Research Institute of Guizhou Province, Guiyang 550006, China
  • Received:2016-02-29 Revised:2016-07-11 Online:2016-12-12 Published:2016-08-24
  • Contact: 王绍华, E-mail: wangsh@njau.edu.cn E-mail:gzldq760@163.com
  • Supported by:

    The study was supported by the Guizhou Province Agricultural Scientific Research Program [NY(2014)3018], the Guizhou Province Agricultural Science and Technology Achievements Transformation Projects [(2015)5021], the Guizhou Academy of Agricultural Sciences Special Funds [(2014) 013], and Independent Innovation Special Funds [(2014)019].

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Abstract:

Rice is one of the most important staple food crops in Guizhou province, it is critical to ensure food safety through continually improving grain yield per unit area. In order to study the population quality characteristics of indica hybrid rice with different yield levels in Guizhou plateau mountain area, field experiments were conducted at six planting regions in 2011 and 2012. The populations with super-high-yielding (12.0-14.5 t ha-1), high-yielding (10.5-12.0 t ha-1), and medium-yielding levels (9-10.5 t ha-1) were obtained from super hybrid rice Jinyou785. To study their yield, yield components, and population quality characteristics. Productive panicle number was the most important factor influencing the rice yield across planting regions and years, followed by spikelets per panicle and filled grain percentage. The correlation between yield and grain weight was not significant. Between productive panicle number and yield, the direct path coefficient was 0.5822 in 2011 and 0.7304 in 2012, the correlation coefficient was 0.7771 in 2011 and 0.8858 in 2012. There was little difference in dry matter accumulation at heading among different populations, however, a significant difference in dry matter accumulation at maturity. Compared with high-yielding rice and medium-yielding rice, the averaged dry matter accumulations of super-high-yielding rice were 7.7% and 15.9% higher, respectively. When values were averaged across years, compared with high-yielding rice and medium-yielding rice, the super-high-yielding rice had 9.7% and 21.5% higher ratio of spikelets per leaf area, 10.9% and 17.8% higher ratio of filled grains per leaf area, 4.3% and 8.4% higher grain weight per leaf area, respectively. As for the panicle size, compared with medium-yielding rice, both super-high-yielding and high-yielding rice had more percentage of large panicles with spikelets above 250 and less percentage of panicles with spikelets below 100. As to top four leaves, the medium-yielding rice had the longest 1st leaf and lowest 4th leaf from top, meanwhile, the super-high-yielding and high-yielding rice had the longest 2nd leaf and lowest 4th leaf from top. Therefore, increasing productive panicle number and promoting large panicle formation will be helpful to improve rice yield, in addition, it is also very important to ensure optimum leaf area index at heading and increase the dry matter accumulations after heading stage.

Key words: Indica hybrid rice, Different yield, Population quality, Dry matter, Grain leaf ratio, Panicle type

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