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Starch granule size in grains of hybrid rice with low chalkiness occurrence

Published online by Cambridge University Press:  26 May 2022

Jialin Cao ,
Maoyan Tang ,
Ruichun Zhang ,
Jiana Chen ,
Fangbo Cao ,
Longsheng Liu ,
Shengliang Fang ,
Ming Zhang  and
Min Huang Open the ORCID record for Min Huang [Opens in a new window]
Jialin Cao
Affiliation:
Rice and Product Ecophysiology, Key Laboratory of Ministry of Education for Crop Physiology and Molecular Biology, Hunan Agricultural University, Changsha, 410128, China
Maoyan Tang
Affiliation:
Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, 530007, China
Ruichun Zhang
Affiliation:
Hengyang Academy of Agricultural Sciences, Hengyang, 421101, China
Jiana Chen
Affiliation:
Rice and Product Ecophysiology, Key Laboratory of Ministry of Education for Crop Physiology and Molecular Biology, Hunan Agricultural University, Changsha, 410128, China
Fangbo Cao
Affiliation:
Rice and Product Ecophysiology, Key Laboratory of Ministry of Education for Crop Physiology and Molecular Biology, Hunan Agricultural University, Changsha, 410128, China
Longsheng Liu
Affiliation:
Hengyang Academy of Agricultural Sciences, Hengyang, 421101, China
Shengliang Fang
Affiliation:
Hengyang Academy of Agricultural Sciences, Hengyang, 421101, China
Ming Zhang
Affiliation:
Hengyang Academy of Agricultural Sciences, Hengyang, 421101, China
Min Huang*
Affiliation:
Rice and Product Ecophysiology, Key Laboratory of Ministry of Education for Crop Physiology and Molecular Biology, Hunan Agricultural University, Changsha, 410128, China
*
*Corresponding author. E-mail: mhuang@hunau.edu.cn
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Summary

The occurrence of chalkiness has decreased in new hybrid rice cultivars in China. As both chalkiness occurrence and starch granule size are associated with the biosynthesis of starch, we hypothesized that there may be a correlation between chalkiness occurrence and starch granule size, and this may partially explain the decreased chalkiness occurrence in the new hybrid rice cultivars. To test this hypothesis, a field experiment was conducted over eight environments (two years × four sowing dates) with two hybrid rice cultivars: one recently developed with low chalkiness occurrence, Jingliangyou 1468 (JLY1468) and a relatively older cultivar with high chalkiness occurrence, Liangyoupeijiu (LYPJ). Results showed that JLY1468 had a higher cumulative distribution of large-diameter (7.51–19.50 μm) starch granules and a lower grain weight of milled rice compared to LYPJ. As a consequence, mean and relative starch granule diameters were 6% and 21% higher in JLY1468 than in LYPJ, respectively. Although both the chalky grain rate and chalkiness degree were negatively correlated with mean and relative starch granule diameter, they were more closely correlated with the relative granule diameter. These results support our hypothesis regarding the relationship between chalkiness occurrence and starch granule size and suggest that the relative starch granule diameter is a relevant parameter in understanding the occurrence of chalkiness in hybrid rice.

Keywords

ChalkinessHybrid riceStarch granules
Type
Research Article
Information
Experimental Agriculture , Volume 58 , 2022 , e17
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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Footnotes

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These authors contributed equally to this work.

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