Positional variations in chalky occurrence within a rice panicle and its relation to grain nutritional quality
Fangmin Cheng A , Yi Liu A , Zhenghui Liu A , Ningchun Zhao A , Feng Wang A , Qifang Zhang A and Guoping Zhang A BA Agronomy Department, Huajia Chi Campus, Zhejiang University, Hangzhou 310029, China.
B Corresponding author. Email: Zhanggp@zju.edu.cn.
Australian Journal of Agricultural Research 58(2) 95-103 https://doi.org/10.1071/AR06138
Submitted: 7 May 2006 Accepted: 16 October 2006 Published: 22 February 2007
Abstract
The effect of grain position within a panicle on chalky occurrence, and its relation to phytic acid and protein content, were studied using 6 Japonica rice cultivars with compact panicles and through leaf and floret removal treatments to alter source-sink ratio. There were significant differences in total chalky grain (TCG), white core grain (WCG), white belly grain (WBG), and WCG/WBG among grains within a panicle, with the top and primary rachides having higher WBG than the bottom and secondary rachides. Alteration of source-sink ratio had a remarkable influence on chalky grain occurrence and its positional distribution within a panicle, and the extent of the influence varied greatly with cultivars. In comparison with WCG, WBG occurrence was more susceptible to the alteration of source-sink ratio. No significant correlation was found between chalky percentage and phytic acid and protein contents for the grains in the different positions within a panicle. Chalky occurrence had little effect on the nutritional quality.
Additional keywords: grain position, Oryza sativa L.
Acknowledgments
The authors are deeply indebted to the National Natural Science Foundation of China (No. 30471020) for its financial support of this research project.
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