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GrainGenes Reference Report: PGR-42-125

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Reference	PGR-42-125
Title	Relationship between gibberellins, height, and stress tolerance in barley (Hordeum vulgare L.) seedlings
Journal	Plant Growth Regulation
Year	2004
Volume	42
Pages	125-135
Author	Sarkar S [ Show all 6 ]
Abstract	Summary: The relationship between gibberellin (GA) levels, height, and stress tolerance was investigated using barley (Hordeum vulgare L.) seedlings, which were exposed to heat stress (50(degree)C for 3 h) and a free radical generator (Paraquat). Barley cv. Perth seedlings were treated with GA-inhibitors, either a triazole or one of two acylcyclohexanediones. They were tested along with four mutants that were either responsive (MC96 and dwf1) or non-responsive (MC90 and Dwf2) to applied growth-active GAs. Analyses of seedlings, whether mutants, or treated with GA-inhibitors, gave a negative correlation between height and tolerance. We also observed that the shorter seedlings with the least amount of growth active GAs were the most tolerant to stress. The overall results of this study suggest that reduced GA levels or sensitivity to GA, with a concomitant reduction in height are important for induction of stress tolerance
Keyword	[ Hide all but 1 of 22 ] barley biosynthesis ga gibberellin gibberellins growth heat stress heat-stress height hordeum hordeum vulgare induction paclobutrazol paraquat protection reduction seedling sensitivity stress stress tolerance tolerance wheat seedlings

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