数字农科院2.0

RNA HELICASE 32 is essential for female gametophyte development in Arabidopsis

文献类型： 外文期刊

作者： Jinhong Yuan;Huijie Jin;Munan Tian;Daiyu Li;Yao Meng;Huihui Zhou;Meng Liu;Deqing Meng;Yunliang Wei;Liuchun Feng;Shifei Sang;Changbin Chen;Shengdong Ji;Junhua Li

作者机构：

关键词： Arabidopsis;Cell cycle;Female gametogenesis;RNA helicase;Vacuole biogenesis

期刊名称： Plant Science

ISSN： 0168-9452

年卷期： 2024 年 347 卷

页码：

收录情况： SCIE（2024版）

摘要： The normal progression of mitotic cycles and synchronized development within female reproductive organs are pivotal for sexual reproduction in plants. Nevertheless, our understanding of the genetic regulation governing mitotic cycles during the haploid phase of higher plants remains limited. In this study, we characterized RNA HELICASE 32 (RH32), which plays an essential role in female gametogenesis in Arabidopsis. The rh32 heterozygous mutant was semi-sterile, whereas the homozygous mutant was nonviable. The rh32 mutant allele could be transmitted through the male gametophyte, but not the female gametophyte. Phenotypic analysis revealed impaired mitotic progression, synchronization, and cell specification in rh32 female gametophytes, causing the arrest of embryo sacs. In the delayed pollination test, none of the retarded embryo sacs developed into functional female gametophytes, and the vast majority of rh32 female gametophytes were defective in the formation of the large central vacuole. RH32 is strongly expressed in the embryo sac. Knock-down of RH32 resulted in the accumulation of unprocessed 18 S pre-rRNA, implying that RH32 is involved in ribosome synthesis. Based on these findings, we propose that RH32 plays a role in ribosome synthesis, which is critical for multiple processes in female gametophyte development.

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