The role of proline-associated pentose phosphate pathway in cool-season turfgrasses after UV-B exposure

被引：25

作者：

Sarkar, Dipayan ^{[1
,2
]}

Bhowmik, Prasanta C. ^{[2
]}

Young-In-Kwon ^{[1
,3
]}

Shetty, Kalidas ^{[1
]}

机构：

[1] Univ Massachusetts, Chenoweth Lab, Dept Food Sci, Amherst, MA 01003 USA

[2] Univ Massachusetts, Dept Plant Soil & Insect Sci, Amherst, MA 01003 USA

[3] Hannam Univ, Dept Food & Nutr, Taejon 305811, South Korea

来源：

ENVIRONMENTAL AND EXPERIMENTAL BOTANY | 2011年 / 70卷 / 2-3期

关键词：

Glucose-6-phosphate dehydrogenase; Pentose phosphate pathway; Phenolic; Proline; UV-B stress; ULTRAVIOLET-B; KENTUCKY BLUEGRASS; RADIATION-DAMAGE; SECONDARY METABOLITES; SUPEROXIDE-DISMUTASE; ANTIOXIDANT ENZYMES; PLANT; OZONE; RESPONSES; STRESS;

D O I：

10.1016/j.envexpbot.2010.09.018

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Physiological adjustments of cool-season turfgrasses were investigated to determine the role of proline-associated pentose phosphate pathway for phenolic biosynthesis and stimulation of antioxidant response system following UV-B exposure. Creeping bentgrass, Kentucky bluegrass, tall fescue, and perennial rye-grass plugs were subjected to artificial UV-B exposure (biologically effective UVBBE radiation 8 kJ m(-2) d(-1).) for one week with 10-h photoperiod. Significant accumulation of phenolics and stimulation of antioxidant enzyme activity was observed in all investigated cool-season turfgrasses after UV-B exposure and this induction corroborated with higher glucose-6-phosphate dehydrogenase activity and high accumulation of proline. Guaiacol peroxidase activity also increased in all investigated cool-season turfgrass species after UV-B exposure. In this study, the shift of carbon flux from glycolysis to pentose phosphate pathway following UV-B exposure and as a result of that, the higher accumulation of phenolics and stimulation of antioxidant response system provides an insight to understand a probable defense mechanism of cool-season turfgrasses against UV stress. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：251 / 258

页数：8

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