文献类型： 外文期刊
作者： Cao, Jialin 1 ; Tang, Maoyan 2 ; Zhang, Ruichun 3 ; Chen, Jiana 1 ; Cao, Fangbo 1 ; Liu, Longsheng 3 ; Fang, Shengliang 3 ; Zhang, Ming 3 ; Huang, Min 1 ;
作者机构： 1.Hunan Agr Univ, Minist Educ Crop Physiol & Mol Biol, Rice & Prod Ecophysiol, Key Lab, Changsha 410128, Peoples R China
2.Guangxi Acad Agr Sci, Rice Res Inst, Nanning 530007, Peoples R China
3.Hengyang Acad Agr Sci, Hengyang 421101, Peoples R China
关键词： Chalkiness; Hybrid rice; Starch granules
期刊名称：EXPERIMENTAL AGRICULTURE （ 影响因子：2.234； 五年影响因子：2.208 ）
ISSN： 0014-4797
年卷期： 2022 年 58 卷
页码：
收录情况： SCI
摘要： 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 x 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 mu m) 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.
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