Nitric oxide (NO)-dependent and NO-independent signaling pathways act in ABA-inhibition of stomatal opening.
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.
Yang
Jiupian
J
Faculty of Agriculture; Kagoshima University; Kagoshima, Japan.
Matsumoto
Yoshifumi
Y
Etoh
Takeomi
T
Iwai
Sumio
S
Curr Opin Plant Biol. 1999 Aug;2(4):287-94
10459001
Trends Plant Sci. 2001 Apr;6(4):177-83
11286923
J Exp Bot. 2004 Jan;55(395):205-12
14673026
Plant Physiol. 2002 Jan;128(1):13-6
11788747
Science. 2001 Jun 15;292(5524):2070-2
11408655
J Exp Bot. 2002 May;53(372):1237-47
11997372
Plant Physiol. 2002 Jul;129(3):954-6
12114551
Plant Cell Environ. 2007 Oct;30(10):1320-5
17727421
New Phytol. 2003 Jul;159(1):11-35
33873677
Plant Physiol. 2002 Mar;128(3):790-2
11891235
Annu Rev Plant Biol. 2003;54:109-36
14502987
Planta. 2000 Jan;210(2):215-21
10664127
Nature. 1998 Aug 6;394(6693):585-8
9707120
Science. 2006 Apr 14;312(5771):264-6
16614222