2012 Fiscal Year Final Research Report

Roles of water and solutes related to hypertrophy of lodicules atflowering.

Research Project

Project/Area Number	23658020
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Crop science/Weed science
Research Institution	National Agriculture and Food Research Organization
Principal Investigator	KOIKE Setsuo 独立行政法人農業・食品産業技術総合研究機構, 東北農業研究センター生産基盤研究領域, 専門員 (60355279)
Co-Investigator(Kenkyū-buntansha)	HAYASHI Takami 独立行政法人農業・食品産業技術総合研究機構, 東北農業研究センター生産基盤研究領域, 主任研究員 (00355281)
Project Period (FY)	2011 – 2012
Keywords	イネ / 開穎 / 鱗被 / 肥大 / 溶質 / 糖 / 無機塩
Research Abstract	Fructose and glucose as sugars and potassium and chloride as major inorganic ions were revealed as major solute components and osmotic substances related to the hypertrophy of lodicules. Fructose and glucose were increased their contents four to five times higher compared with one hour before flowering. Soluble invertase activities measured at pH5.0 were ten times higher than those at pH7.0. Consequently, accumulations of fructose and glucose in the lodicules at flowering mightbe resulted from acidic invertase activities in the vacuoles of lodicules.