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The Rice Receptorlike Kinases DWARF AND RUNTISH SPIKELET1 and 2 Repress Cell Death and Affect Sugar Utilizationin Reproductive Development

发布时间：2017-05-03

Cuixia Pu, Yongfeng Han, Shu Zhu, Fengyan Song, Ying Zhao, Chunyan Wang, Yongcun Zhang, Qian Yang, Jiao Wang, Shuolei Bu, Lijing Sun, Shengwei Zhang, Suqiao Zhang, Daye Sun and Ying Sun*

Plant Cell

DOI:10.1105/tpc

Abstract

Cell to cell communication precisely controls the creation of new organs during reproductive growth. However, the sensor molecules that mediate developmental signals in monocot plants are poorly understood. Here, we report that DWARF AND RUNTISH SPIKELET1 (DRUS1) and DRUS2, two closely related receptorlike kinases (RLKs), redundantly control reproductive growth and development in rice (Oryza sativa). A drus1 drus2 double knockout mutant, but not either single mutant, showed extreme dwarfism and barren inflorescencesthat harbored sterile spikelets. The gibberellin pathway was not impaired in this mutant. A phenotypic comparison of mutants expressing different amounts of DRUS1 and 2 revealed that reproductive growth requires a threshold level of DRUS1/2 proteins. DRUS1 and 2 maintain cell viability by repressing proteasemediated cell degradation and likely by affecting sugar utilization or conversion. In the later stages of anther development, survival of the endothecium requires DRUS1/2, which may stimulate expression of the UDPglucose pyrophosphorylase gene UGP2 and starch biosynthesis in pollen. Unlike their Arabidopsis thaliana ortholog FERONIA,DRUS1 and 2 mediate a fundamental signaling process that is essential for cell survival and represents a novel biological function for the CrRLK1L RLK subfamily.

链接：http://www.plantcell.org/content/29/1/70.long