Molecular dissection of sugar transport and uptake mechanisms during pollen maturation of rice

2015 Fiscal Year Final Research Report

• Project/Area Number: 25450032
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Crop production science
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: HIROSE Tatsuro 国立研究開発法人農業・食品産業技術総合研究機構, 中央農業研究センター作物開発研究領域, 上級研究員 (90355579)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: イネ / 花粉 / 糖輸送 / 糖代謝 / 遺伝子 / デンプン / ショ糖

Outline of Final Research Achievements

To understand the molecular mechanism of sugar transport during pollen maturation in rice, gene functions of a sugar-effluxer OsSweet5 and a sucrose-uptake transporter OsSUT3 were examined because both genes were highly expressed in the stamen or pollen. While gene knock-out of OsSweet5 did not affect pollen maturation and no phenotypic change was observed, RNAi suppression of OsSUT3 inhibited starch accumulation in the pollen grains. These results suggest that, contrary to expectation from the gene expression pattern, OsSweet5 is not essential for pollen maturation, and that OsSUT3 has an essential role for uptaking sucrose from locular fluid as a substrate for starch synthesis.

Free Research Field

作物生産生理学