28. 低窒素条件下のキュウリにおけるアブシジン酸の硝酸還元酵素、亜硝酸還元酵素および光合成に対する影響

概要

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Abscisic acid (ABA) plays an important role in response to some stresses in plants. The purpose of this study is to know the mode of action of ABA on the growth and development of cucumber (Cucumis sativus L. cv. Hokushin) grown under low nitrogen conditions. We have already reported that ABA increased contents of chlorophyll, amino acid and protein in low nitrogen conditions. In this study we investigated effects of ABA on nitrate and nitrite reduction, which are the first steps of nitrogen assimilation. Nitrate reductase activities were enhanced by the application of ABA in both the aerial parts and roots in different growth stage of plants. ABA also enhanced nitrite reductase activities only in roots in younger plants, but in not only roots but also aerial parts in older plants. ABA enhanced photosynthesis activities, especially in cotyledon in all growth stages. These results suggest that ABA promotes the nitrogen and the carbon assimilation under low nitrogen conditions.
植物化学調節学会の論文
2004-10-13