Classification of panicle type and its relationship with grain yield and quality of rice based on grain density in Hubei province

doi:10.14088/j.cnki.issn0439-8114.2019.11.008

Abstract

Abstract: Using the date of yield components, yield, and rice quality of 74 varieties from the mid-season regional trial summary report in Hubei in 2017, cluster analysis was carried out by grain density, and on the basis of this result the classification standard of grain density were determined by reference to the classification of predecessors. The relationship between grain density and yield was analyzed by regression analysis and variance analysis, and the correlation between panicle type and rice quality was analyzed. The results showed that there were differences in panicle traits among 74 rice（Oryza sative L.） cultivars. The coefficients of variation according to the order from big to small is grain density, 1 000-grain weight, grain number, panicle number, seed setting rate, panicle length. 74 varieties were divided into three types based on the grain density in panicle, including the dense panicle type, the loose panicle type and the semi-dense panicle type. The grain density was higher than 7.96 grain/cm for the dense panicle type, less than 6.85 grain/cm for the loose panicle type, and between 6.85 and 7.86 for the semi-dense panicle type. There were significant differences in panicle length, grain number, seed setting rate,1 000-grain weight, grain density among these three type varieties. Yield and grain density showed a typical parabolic relationship（F=17.83,P<0.01）, and the yield reached the highest when the grain density was between 7.5 and 8.5 grains/cm. The appearance quality（chalky grain rate, chalkiness）, milling quality （brown rice rate, milled rice rate, head rice rate） and cooking quality （gel consistency, alkali spreading value） of the dense panicle type were better than the loose panicle type and the semi-dense panicle type. Therefore, in order to ensure the high yield and high quality of the new varieties to be selected, it is necessary to control the grain density between 7.5 and 8.0 grain/cm as much as possible.

Key words: rice（Oryza sative L.）, panicle type, grain density, yield, quality, Hubei province

CLC Number:

S511

FANG Zhen-bing, WANG Ben-fu, TIAN Yong-hong, CHEN Bo, FAN Bing, ZHAO Sha-sha, PAN Gao-feng. Classification of panicle type and its relationship with grain yield and quality of rice based on grain density in Hubei province[J]. HUBEI AGRICULTURAL SCIENCES, 2019, 58(11): 31-34.

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