冷水施与によるキュウリ奇形葉の発生および TNZ303(ジャスモン酸誘導体・ブラシノステロイド誘導体混合剤)種子処理による発生の軽減

The occurrence of deformed leaves in cucumber by the treatment of cold water and its reduction in TNZ303 (mixture of jasmonic acid derivative and brassinosteroids derivative) seed treatment were studied. Treating shoot apices of cucumber seedlings with 4°C water induced the development of deformed leaves and suppressed vegetative growth, whereas treatment with 25°C water had a slight effect on leaf deformity. Immersion of seed in 1000 × dilution of TNZ303 for 24 hr decreased the occurrence of deformed leaves and mitigated the suppression of vegetative growth of seedlings whose apices were treated with 4°C water. These results indicate that seed treatment with TNZ303 can overcome the occurrence of deformed leaves by elevating plant's cold tolerance.