OsLAP6/OsPKS1, an orthologue of Arabidopsis PKSA/LAP6, is critical for proper pollen exine formation

文献类型： 外文期刊

第一作者： Xiao, Qiao

作者： Xiao, Qiao;Li, Wenjie;Luo, Tao;Yuan, Guoqiang;He, Zhiyuan;Liu, Mingxing;Li, Qiao;Xu, Peizhou;Zhu, Jun;Liang, Yueyang;Wang, Shiquan;Zheng, Aiping;Wang, Lingxia;Li, Ping;Li, Shuangcheng;Zhu, Jun;Li, Ping;Li, Shuangcheng;Zou, Ting;Li, Qiao

作者机构：

关键词： Rice;OsLAP6/OsPKS1;PKSA/LAP6;Male sterility;Pollen exine;Sporopollenin

期刊名称：RICE （ 影响因子：4.783； 五年影响因子：5.23 ）

ISSN： 1939-8425

年卷期： 2017 年 10 卷

页码：

收录情况： SCI

摘要： Background: Male fertility is crucial for rice yield, and the improvement of rice yield requires hybrid production that depends on male sterile lines. Although recent studies have revealed several important genes in male reproductive development, our understanding of the mechanisms of rice pollen development remains unclear. Results: We identified a rice mutant oslap6 with complete male sterile phenotype caused by defects in pollen exine formation. By using the MutMap method, we found that a single nucleotide polymorphism (SNP) variation located in the second exon of OsLAP6/OsPKS1 was responsible for the mutant phenotype. OsLAP6/OsPKS1 is an orthologous gene of Arabidopsis PKSA/LAP6, which functions in sporopollenin metabolism. Several other loss-of-function mutants of OsLAP6/OsPKS1 generated by the CRISPR/Cas9 genomic editing tool also exhibited the same phenotype of male sterility. Our cellular analysis suggested that OsLAP6/OsPKS1 might regulate pollen exine formation by affecting bacula elongation. Expression examination indicated that OsLAP6/OsPKS1 is specifically expressed in tapetum, and its product is localized to the endoplasmic reticulum (ER). Protein sequence analysis indicated that OsLAP6/OsPKS1 is conserved in land plants. Conclusions: OsLAP6/OsPKS1 is a critical molecular switch for rice male fertility by participating in a conserved sporopollenin precursor biosynthetic pathway in land plants. Manipulation of OsLAP6/OsPKS1 has potential for application in hybrid rice breeding.

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