Analysis of physiological reaction related to glassiness grain and the suggestion of high-quality and high-yielding management of hulless barley

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K06001
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 39020:Crop production science-related
• Research Institution: Ehime University
• Principal Investigator: Araki Takuya 愛媛大学, 農学研究科, 教授 (10363326)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: ハダカムギ / 硝子率 / 晩播 / 播種量 / 収量 / 分げつ

Outline of Final Research Achievements

In standard sowing, having many tillers, the ratio of dry weight of tillers after appearance of primary tillers developing from the third leaf axil to all the tillers amounted to 31%. In late sowing with 11g m-2, having not so much tillers, the ratio of dry weight of main stem and primary tillers developing from the first and second leaves axil occupied 70%. Late sowing significantly restricted number of panicles per plant compared to standard sowing, but has no effect on grain yield. Grain glassiness rate per grain differed among tillers, and the later appearance of tillers, the higher the value showed. The anthesis term of all the tillers of a plant showed for twelve days in Mannenboshi. The timing of anthesis in a plant was late at later appearance tillears. The formation of glassiness grain of hullless baley is related to the accumulation of protein in endosperm cells and the ratio of intercellular volume to total volume of grain.

Free Research Field

作物学

Academic Significance and Societal Importance of the Research Achievements

本研究課題では，硝子質粒発生のメカニズムについて登熟期の子実乾燥に伴い含水率が低下した時に雨による吸水が硝子質程度を低くしていることを初めて明らかにした．硝子質粒発生に関するこれまでの研究では，子実タンパク質の蓄積が要因であると報告されていたが，子実乾燥後の吸水が硝子率とより密接な関係があることを見出したことは学術的意義が大きい．また，この結果に基づいて，登熟期以降の天候に応じた子実への吸水を促す栽培技術へと展開できることならびに遅まき栽培における高収量栽培技術への基本的知見を得られたことは社会的意義が大きい．