Establishment of a Pre-Drying Methods for Hot Water Disinfection of Rice Seeds at a High Temperature

日本作物学会紀事

article

柏木 めぐみ¹  大石 千理¹  村田 和優²  尾崎 秀宣²  山田 哲也¹  金勝 一樹¹ 

[1] 東京農工大学大学院連合農学研究科;富山県農林水産総合技術センター農業研究所

关键词: Germinability;    Heat tolerance;    Hot-water disinfection;    Rice;    Seed disinfection;    Seed drying treatment;   

DOI  :  10.1626/jcs.91.120

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The tolerance to high temperature during the treatment for disinfection in rice seeds is strengthened by reducing their water contents to below 10% before the hot water disinfection treatment. Pre-drying treatment prevents the reduction in germinability of the seeds disinfected with hot water at 65ºC for 10 minutes, which is a method used to effectively control several seed-borne diseases. We examined the conditions for pre-drying of seeds using a heating dryer for improving the germinability after the disinfection treatment. The seeds of Nipponbare were dried at 40 – 60ºC for 2 – 72 hours. A higher temperature was more effective for drying. When the seeds were dried at 40ºC, 12 hours of treatment was required to reduce the water content to below 10%. Thereafter, the water content rapidly decreased to around 8% by further heating, but the speed of decrease dropped and the values remained above 7% in the seeds dried for 24 hours at 50ºC. The germinability was not changed by further decrease in water content to less than 7%. In some cases, the seeds dried at 60ºC for 72 hours had lower germinability. Moreover, experimental results using Koshihikari showed that the seeds with a water content reduced to below 9.5% by pre-drying had a germination rate of more than 90%, even after the seeds were disinfected with hot water at 72ºC for 10 min. Taken together, we concluded that pre-drying to a water content of 7 – 9.5% in seeds at 40 – 50ºC for 12 – 24 hours is the most useful method for pre-drying the seeds of Nipponbare and Koshihikari before the hot-water disinfection treatment.

【 授权许可】

CC BY