CHANGES IN ABSCISIC ACID, STOMATAL CONDUCTANCE, AND ANTIOXIDANTS DURING LOW TEMPERATURE PRECONDITIONING AGAINST SO_2 INJURY IN CONTRASTING CULTIVARS OF COLEUS

Views: 1071
Downloads: 1271
このエントリーをはてなブックマークに追加

CHANGES IN ABSCISIC ACID, STOMATAL CONDUCTANCE, AND ANTIOXIDANTS DURING LOW TEMPERATURE PRECONDITIONING AGAINST SO_2 INJURY IN CONTRASTING CULTIVARS OF COLEUS

Format:
Article
Kyushu Univ. Production Kyushu Univ. Production
Responsibility:
Krizek, D.T.(Climate Stress Laboratory ARS U. S. Department of Agriculture)
Terry, P.H.(Plant Hormone Laboratory ARS U.S. Department of Agriculture)
Upadhyaya, A.(Center for Agricultural Biotechnology University of Maryland College Park)

Caldwell, C.R.(Climate Stress Laboratory ARS U. S. Department of Agriculture)
Mirecki, R.M.(Phytonutrients Laboratory | Climate Stress Laboratory ARS U. S. Department of Agriculture)

Show more
Language:
English
Publication info:
BIOTRONICS. 30, pp. 1-14, 2001-12. Biotron Institute, Kyushu University
Version:
Publisher
Abstract:
The influence of 5 days of low temperature preconditioning (13℃) on SO_2 sensitivity in relationship to abscisic acid (ABA) concentration, stomatal conductance, transpiration rate, and SO_2 injury was examined in two cultivars of coleus found previously to differ in stress tolerance: SO_2-sensitive 'Buckley Supreme' ('BS') and SO_2-insensitive 'Marty' ('M'). 'BS' plants grown at 20℃ for 5 days and then fumigated with SO_2 for 2hr had 75% overall injury; those grown at 13℃ for 5 days had only 13% SO_2 injury. Corresponding 'M' plants given 20 and 13℃ pretreatment had 17 and 0% injury, respectively. This decrease in SO_2 sensitivity following preconditioning at 13℃ was associated with an increase in ABA concentration and a decrease in stomatal conductance and transpiration (Tn) rate, which presumably decreased the penetration of SO_2 into the leaf. Changes in the levels of several antioxidants and associated enzyme systems were also determined. Stress-insensitive 'M' contained 47% more ascorbate (AsA) and 17% greater ascorbate peroxidase (AP) activity than stress-sensitive 'BS.' Temperature preconditioning increased AP activity in 'BS' by 11% which was comparable to that found in 'M' at 20℃. Thus, the phytoprotection afforded against SO_2 by temperature preconditioning appears to involve both avoidance and detoxification mechanisms. Read more
View fulltext

Similar Items:

5
QTL分析による浮稲の節間伸長制御機構の解明 by 望月 俊宏; MOCHIZUKI Toshihiro
5.
QTL分析による浮稲の節間伸長制御機構の解明 by 望月 俊宏; MOCHIZUKI Toshihiro