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Article Addendum
Nitric oxide (NO)-dependent and NO-independent signaling pathways act in ABA-inhibition of stomatal opening
Jiupian Yang, Yoshifumi Matsumoto, Takeomi Etoh and Sumio Iwai
volume 3 | issue 2
february 2008Pages: 131 - 132
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We investigated the role of nitric oxide (NO) in ABA-inhibition of stomatal opening in Vicia faba L. in different size dishes. When a large dish (9 cm diameter) was used, ABA induced NO synthesis and the NO scavenger reduced ABA-inhibition of stomatal opening. When a small dish (6 cm diameter) was used, ABA induced stomatal closure and inhibited stomatal opening. The NO scavenger was able to reduce ABA-induced stomatal closure, but unable to reverse ABA-inhibition of stomatal opening. Furthermore, NO was not synthesized in response to ABA, indicating that NO is not required for ABA-inhibition of stomatal opening in the small dish. These results indicated that an NO-dependent and an NO-independent signaling pathway participate in ABA signaling pathway. An NO-dependent pathway is the major player in ABA-induced stomatal closure. However, in ABA-inhibition of stomatal opening, an NO-dependent and an NO-independent pathway act: different signaling molecules participate in ABA-signaling cascade under different environmental condition.
Authors
Jiupian Yang
Faculty of Agriculture, Kagoshima University, Kagoshima, Japan
Yoshifumi Matsumoto
Faculty of Agriculture, Kagoshima University, Kagoshima, Japan
Takeomi Etoh
Faculty of Agriculture, Kagoshima University, Kagoshima, Japan
Sumio Iwai
Faculty of Agriculture, Kagoshima University, Kagoshima, Japan