Xu Zhang, Yu-Jin Kim, Qian Tan, Ki-Hong Jung, Wanqi Liang
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A leucine-rich-repeat receptor-like kinase regulates pollen aperture formation in rice
Apertures in pollen grains exhibit species-specific patterns and provide an ideal model for studying cell-surface patterning. Pollen apertures are critical for cereal crop fertility, and while DEFECTIVE IN APERTURE FORMATION1 (OsDAF1) and INAPERTURATE POLLEN1 (OsINP1) have been documented to participate in pollen aperture formation in rice (Oryza sativa), the molecular transduction pathway regulating aperture formation is largely unknown. Here, we report that a leucine-rich-repeat receptor-like kinase (LRR-RLK), AM1, plays a key role in rice pollen aperture formation. Mutations of OsAM1 lead to complete sterility due to disappearance of the pollen aperture and failure in pollen tube germination. OsAM1 encodes a LRR-RLK that belongs to the STRUBBELIG-receptor family. Similar to other reported aperture regulators, OsAM1 assembles to future aperture sites on tetrads after meiosis to regulate aperture formation. The extracellular and intracellular domain of OsAM1 interacts with OsINP1 and OsDAF1, respectively. However, despite their interaction and the absence of aperture formation in osam1 pollen grains, OsINP1 and OsDAF1 localize to future aperture sites at the tetrad stage. Mutation of OsINP1, however, disrupts normal localization of OsAM1, indicating that OsAM1 acts downstream of OsINP1. Our findings reveal the role of a LRR-RLK protein in pollen aperture formation and shed light on the regulatory network of pollen aperture formation.
期刊介绍:
Plant Physiology® is a distinguished and highly respected journal with a rich history dating back to its establishment in 1926. It stands as a leading international publication in the field of plant biology, covering a comprehensive range of topics from the molecular and structural aspects of plant life to systems biology and ecophysiology. Recognized as the most highly cited journal in plant sciences, Plant Physiology® is a testament to its commitment to excellence and the dissemination of groundbreaking research.
As the official publication of the American Society of Plant Biologists, Plant Physiology® upholds rigorous peer-review standards, ensuring that the scientific community receives the highest quality research. The journal releases 12 issues annually, providing a steady stream of new findings and insights to its readership.