長野県で発生した雑草イネ(トウコン)における脱粒性の推移と脱粒籾の発芽能力

日本作物学会紀事

手塚 光明³  酒井 長雄¹  細井 淳³  青木 政晴³  牛木 純² 

[1] 長野県農業技術課;中央農業総合研究センター;長野県農事試験場

关键词: Buried seed;    埋土種子;    Germination ability;    発芽能力;    Hand weeding;    手取り除草;    Shattering habit;    脱粒性;    Toukon;    トウコン;    Weedy rice;    雑草イネ;   

DOI  :  10.1626/jcs.77.321

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

A weedy rice with a red pericarp, known as ‘Toukon’, has become a serious problem for rice producers in Nagano Prefecture. We studied the seed threshability and shattering habit of weedy rice accessions collected from paddy fields in Nagano to identify the appropriate timing for hand weeding of the weedy rice to prevent them from shattering their seeds and forming a seed bank in the fields. We also studied the germination ability of the weedy rice seed threshed after heading at intervals. We assessed the threshability of the weedy rice accessions grown under a condition undisturbed by wind by stroking their panicles slightly by hand at different times after heading and counted the number of threshed seeds. Some seeds were threshed about 2 weeks after heading, and almost all within 1 month. The number of threshed seeds per day was the highest about 3 to 4 weeks after heading. On the other hand, most accessions grown under field condition started to shatter their seed between 2 weeks and 1 month after heading. Early-heading accessions tended to start shattering sooner after heading than late-heading accessions. Although most threshed seeds in the early stage had green hulls and looked immature, more than 80% of them germinated. Additionally, about 0.1% to 0.2% of the seeds collected from each accession showed dormancy. These results suggest that weedy rice should be cleared from the field within 2 weeks after heading by hand or other weeding methods to prevent them from shattering their seeds and forming a seed bank in the soil.

【 授权许可】

Unknown