期刊
PLANT CELL
卷 23, 期 1, 页码 111-129出版社
OXFORD UNIV PRESS INC
DOI: 10.1105/tpc.109.073692
关键词
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资金
- National High Technology Research and Development Program of China [2006AA10A101, 2009AA101101]
- National Natural Science Foundation of China [30671275, 30800679]
- Ministry of Agriculture of China [2008ZX08009-003, 2009ZX08009-107B]
- National Key Basic Research 973 Program of China [2006CB101703]
- Jiangsu Science and Technology Development Program [BE2008352]
- 111 Project [B0802]
In flowering plants, male meiosis produces four microspores, which develop into pollen grains and are released by anther dehiscence to pollinate female gametophytes. The molecular and cellular mechanisms regulating male meiosis in rice (Oryza sativa) remain poorly understood. Here, we describe a rice pollen semi-sterility1 (pss1) mutant, which displays reduced spikelet fertility (similar to 40%) primarily caused by reduced pollen viability (similar to 50% viable), and defective anther dehiscence. Map-based molecular cloning revealed that PSS1 encodes a kinesin-1-like protein. PSS1 is broadly expressed in various organs, with highest expression in panicles. Furthermore, PSS1 expression is significantly upregulated during anther development and peaks during male meiosis. The PSS1-green fluorescent protein fusion is predominantly localized in the cytoplasm of rice protoplasts. Substitution of a conserved Arg (Arg-289) to His in the PSS1 motor domain nearly abolishes its microtubule-stimulated ATPase activity. Consistent with this, lagging chromosomes and chromosomal bridges were found at anaphase I and anaphase II of male meiosis in the pss1 mutant. Together, our results suggest that PSS1 defines a novel member of the kinesin-1 family essential for male meiotic chromosomal dynamics, male gametogenesis, and anther dehiscence in rice.
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