Quality control for plant gametogenesis

Research Project

Project/Area Number	25440130
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Plant molecular biology/Plant physiology
Research Institution	Nagoya University
Principal Investigator	UEGUCHI CHIHARU 名古屋大学, 生物機能開発利用研究センター, 准教授 (20232738)
Project Period (FY)	2013-04-01 – 2017-03-31
Project Status	Completed (Fiscal Year 2016)
Budget Amount *help	¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000) Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000) Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000) Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords	plant senescence / ionic homeostasis / cation channel / 配偶子形成 / 幹細胞 / イオンホメオスタシス / 生長制御 / 減数分裂 / 染色体構造
Outline of Final Research Achievements	In monocarpic plants, it is observed that developing reproductive structures control whole-plant senescence, so-called global proliferative arrest (GPA). To identify genes involved in this process, we isolated and analyzed a mutant showing premature cessation of inflorescence growth in Arabidopsis. The mutant, named premature aging 1 (pma1), plants exhibited earlier cessation of floral bud formation and stem growth. In addition, pma1 showed premature cessation of leaf growth and earlier senescence. Map-based cloning revealed that pma1 is a missense allele of the CNGC20 gene encoding a cyclic nucleotide-gated cation channel. These results suggest that the maintenance of intracellular ionic homeostasis is important for the process of whole-plant senescence.