文献类型： 外文期刊
作者： Wang, Huihui 1 ; Wang, Xin 1 ; Li, Yangyang 1 ; Cui, Ying 1 ; Yan, Xin 1 ; Gao, Jiadong 2 ; Ouyang, Jiexiu 1 ; Li, Shaobo 1 ;
作者机构： 1.Nanchang Univ, Sch Life Sci, Key Lab Mol Biol & Genet Engn Jiangxi Prov, Nanchang 330031, Peoples R China
2.Guangdong Key Lab Crop Germplasm Resources Preserv, Guangzhou 510640, Peoples R China
3.Guangdong Acad Agr Sci, Agrobiol Gene Res Ctr, Guangzhou 510555, Peoples R China
关键词： Cell division and expansion; Grain size; miR5504; Oryza sativa; Yield
期刊名称：PLANT AND CELL PHYSIOLOGY （ 影响因子：4.9； 五年影响因子：5.7 ）
ISSN： 0032-0781
年卷期： 2024 年 65 卷 5 期
页码：
收录情况： SCI
摘要： MicroRNAs (miRNAs) are known to play critical roles in regulating rice agronomic traits through mRNA cleavage or translational repression. Our previous study indicated that miR5504 regulates plant height by affecting cell proliferation and expansion. Here, the two independent homozygous mir5504 mutants (CR1 and CR2) and overexpression lines (OE1 and OE2) were further used to investigate the functions of miR5504. The panicle length, 1000-grain weight and grain yield per plant of miR5504-OE lines were identical to those of Nipponbare (NIP), but the 1000-grain weight of mir5504 mutants was reduced by about 10% and 9%, respectively. Meanwhile, the grain width and thickness of mir5504 mutants decreased significantly by approximately 10% and 11%, respectively. Moreover, the cytological results revealed a significant decrease in cell number along grain width direction and cell width in spikelet in mir5504, compared with those in NIP. In addition, several major storage substances of the rice seeds were measured. Compared to NIP, the amylose content of the mir5504 seeds was noticeably decreased, leading to an increase of nearly 10 mm in gel consistency (GC) in mir5504 lines. Further investigation confirmed that LOC_Os08g16914 was the genuine target of miR5504: LOC_Os08g16914 over-expression plants phenocopied the mir5504 mutants. This study provides insights into the role of miR5504 in rice seed development.
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