17 アブシジン酸による低窒素条件下で生育させたキュウリの黄化阻害

概要

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Nitrogen deficiency has been shown to result in yellowing of mature leaves in higher plants. We found that the application of benzyladenine did not inhibit yellowing of cucumber (Cucumis sativus) leaves grown in low nitrogen medium, but abscisic acid (ABA) substantially did. Chlorophyll contents in leaves and stems of cucumber cultivated in the low nitrogen medium containing ABA significantly increased, especially in cotyledons and immature leaves, as its dose dependent manner. Two days application of ABA was not effective on the inhibition of yellowing of cucumber plants. When the time of transfer from the medium containing ABA to drug free one was delayed beyond 2 weeks, yellowing of cucumber plants was inhibited. In this case, the efficiency of the inhibition was dependent on the application period of ABA. Nitrogen contents, especially nitrate, in cucumber plants grown under low nitrogen conditions in the presence of ABA were higher than those in the absence of ABA. These results suggest that ABA promotes absorption and/or accumulation of nitrate and inhibits yellowing of cucumber plants in low nitrogen conditions.
植物化学調節学会の論文
2002-10-31