<FONT face="Verdana">Changes in  Agronomic Traits of  Indica Hybrid Rice During Genetic Improvement </FONT>

WANG  Danying,XU  Chunmei,YUAN  Jiang,WEI  Xinghua,LIAO  Xiyuan,ZHANG  Xiufu

doi:10.3969/j.issn.1001-7216.2010.02.09

Chinese Journal OF Rice Science >

2010 , Vol. 24 >Issue 2: 157 - 161

DOI: https://doi.org/10.3969/j.issn.1001-7216.2010.02.09

研究报告

Changes in Agronomic Traits of Indica Hybrid Rice During Genetic Improvement

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1 China National Rice Research Institute, Hangzhou 310006, China; 2 Key Laboratory of Southern Crop Physiology and Ecology, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China; * Corresponding author, E-mail: zhangxf169@sohu.com

Received date: 1900-01-01

Revised date: 1900-01-01

Online published: 2010-03-10

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Abstract

In order to elucidate the changes of agronomic traits during genetic improvement, 23 typical indica hybrid rice combinations applied in the production in the middle and lower reaches of the Yangtze River during the last 30 years were used. All the hybrid rice combinations were grown in the same field, yield and morphological characters of single plant were compared, and correlation and path analyses among agronomic characteristics were conducted. During the 30 years of genetic improvement, the effective panicle number per plant was progressively decreased, which caused the decrease of grain yield and biomass per plant of hybrid rice combinations in spite of the slightly increased plant height, 1000grain weight and number of grains per panicle. Although the transformation percentage of the matter in stem and sheath decreased after flowering, leaf photosynthetic capacity after flowering increased as well as panicle weight. Correlation and path analyses showed that although both biomass per plant and number of grains per panicle were significantly correlated with grain yield per plant, biomass per plant acted as the key factor affecting yield per plant. It is suggested that in rice high yield cultivation, panicle number was as important as large panicle, and tillering ability should not be neglected in breeding.

Key words： indica hybrid rice; genetic improvement; agronomic trait

Cite this article

WANG Danying,XU Chunmei,YUAN Jiang,WEI Xinghua,LIAO Xiyuan,ZHANG Xiufu . Changes in Agronomic Traits of Indica Hybrid Rice During Genetic Improvement [J]. Chinese Journal OF Rice Science, 2010 , 24(2) : 157 -161 . DOI: 10.3969/j.issn.1001-7216.2010.02.09

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