Reactive oxygen species in leaf abscission signaling.
Reactive oxygen species (ROS) are produced in response to many environmental stresses, such as UV, chilling, salt and pathogen attack. These stresses also accompany leaf abscission in some plants, however, the relationship between these stresses and abscission is poorly understood. In our recent report, we developed an in vitro abscission system that reproduces stress-induced pepper leaf abscission in planta. Using this system, we demonstrated that continuous production of hydrogen peroxide (H(2)O(2)) is involved in leaf abscission signaling. Continuous H(2)O(2) production is required to induce expression of the cell wall-degrading enzyme, cellulase and functions downstream of ethylene in abscission signaling. Furthermore, enhanced production of H(2)O(2) occurs at the execution phase of abscission, suggesting that H(2)O(2) also plays a role in the cell-wall degradation process. These data suggest that H(2)O(2) has several roles in leaf abscission signaling. Here, we propose a model for these roles.
Sakamoto
Masaru
M
Iwate Biotechnology Research Center; Kitakami, Iwate Japan.
Munemura
Ikuko
I
Tomita
Reiko
R
Kobayashi
Kappei
K
Plant Cell. 1997 Jul;9(7):1169-79
9254934
Curr Opin Biotechnol. 2005 Apr;16(2):123-32
15831376
Curr Opin Plant Biol. 2006 Feb;9(1):59-65
16337172
Plant Physiol. 2008 Mar;146(3):1305-21
18192438
Biochem J. 1998 Jun 1;332 ( Pt 2):507-15
9601081
Plant Physiol. 2006 Jun;141(2):341-5
16760485
Plant Physiol. 2000 Jul;123(3):869-81
10889236
Plant J. 2008 Oct;56(1):13-27
18557836
Biochem J. 1984 Apr 1;219(1):1-14
6326753
Plant J. 2001 Dec;28(6):679-88
11851914
Phytochemistry. 2000 Mar;53(5):565-70
10724181
Plant Physiol. 2006 Aug;141(4):1604-16
16778017
J Exp Bot. 2005 Jul;56(417):1867-75
15928018
Plant Physiol. 1982 Apr;69(4):789-92
16662297
Annu Rev Plant Biol. 2004;55:373-99
15377225
Plant J. 2006 Sep;47(6):851-63
16889645
Plant Physiol. 2002 Nov;130(3):1487-96
12428013
Physiol Plant. 2001 Nov;113(3):338-345
12060278
Plant Physiol. 1996 Sep;112(1):401-408
12226398