Basic study on hot water disinfection method without using chemical pesticide for seeds of various crops

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05991
• 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: Tokyo University of Agriculture and Technology
• Principal Investigator: KANEKATSU Motoki 東京農工大学, (連合)農学研究科(研究院), 教授 (60177508)
• Co-Investigator(Kenkyū-buntansha): 村田 和優 富山県農林水産総合技術センター, 富山県農林水産総合技術センター農業研究所, 副主幹研究員 (80500793)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 種子温湯消毒 / 水稲 / 大麦 / 減農薬 / 病害防除 / 遺伝解析

Outline of Final Research Achievements

We have previously found that reducing the moisture content of the seed to less than 10% (pre-drying treatment) can enhance the tolerance to high temperature in the hot water disinfection of rice seeds without using pesticides. And then we have also established the method for treating rice seeds at high temperatures that are highly effective for pest control. To elucidate the mechanism by which this pre-drying treatment enhances high temperature tolerance, genetic analysis (QTL analysis) has been carried out. It was revealed that the gene involved in this mechanism is located on chromosome 1. The results also indicated that drying at 40-50°C for 12-24 hours is practical for pre-drying treatment conditions. Furthermore, the effect of pre-drying was also detected in barley seeds, suggesting that hot water disinfection can be an effective disinfection method in the malting process.

Free Research Field

発芽生理学、植物育種学

Academic Significance and Societal Importance of the Research Achievements

我々が開発した「事前乾燥処理」を組み込んだ高温温湯消毒法は、防除効果が高く、農薬による種子消毒法に置き換わることができる優れた技術である。本研究では、事前乾燥処理による高温耐性強化機構に関する知見が得られ、生産現場で実用的な「事前乾燥処理法」も確立できた。さらに水稲以外の作物種の大麦でも事前乾燥処理の効果があることが示された。これにより、種子消毒においては農薬を大幅に削減でき、クリーンな農業の実現が可能になる。