GrainGenes Reference Report: PPS-90-854
Reference
PPS-90-854
Title
Effect of temperature on gibberellin (GA) responsiveness and on endogenous GA(1) content of tall and dwarf wheat genotypes
Journal
Plant Physiology
Year
1989
Volume
90
Pages
854-859
Author
Pinthus MJ Israel Gale MD Appleford NEJ Lenton JR
Type
Article
Language
English
Abstract
Near-isogentic wheat (Triticum aestivum L.) lines differing in height- reducing (Rht) alleles were used to investigate the effects of temperature on endogenous gibberellin (GA) levels and seedling growth response to applied GA(3). Sheath and lamina lengths of the first leaf were measured in GA treated and control seedlings, grown at 11, 18, and 25 degrees C, of six Rht genotypes in each of two varietal backgrounds, cv Maris Huntsman and cv April Bearded. Endogenous GA(1) levels in the leaf extension zone of untreated seedlings were determined by gas chromatography-mass spectrometry with a deuterated internal standard in the six Maris Huntsman Rht lines grown at 10 and 25 degrees C. Higher temperature increased leaf length considerably in the tall genotype, less so in the Rht1 and Rht2 genotypes, and had no consistent effect on the Rht1+2, Rht3 and Rht2+3 genotypes. In all genotypes, endogenous GA(1) was higher at 25 degrees C than at 10 degrees C. At 10 degrees C the endogenous GA(1) was at a similar level in all the genotypes (except Rht2+3). At 25 degrees C it increased 1.6-fold in the tall genotype, 3-fold in Rht1 and Rht2, 6-fold in Rht3, and 9-fold in Rht1+2. Likewise, the genotypic differences in leaf length were very conspicuous at 25 degrees C, but were only slight and often unsignificant at 11 degrees C. The response of leaf length to applied GA(3) in the Rht1, Rht2, and Rht1+2 genotypes increased significantly with lowering of temperature. These results suggest the possibility that the temperature effect on leaf elongation is mediated through its effect on the level of endogenous GA(1) and that leaf elongation response to endogenous or applied GAs is restricted by the upper limits set by the different Rht alleles.
Keyword
[ Hide all but 1 of 11 ] alleles ga genetic control genotypes isogenic lines leaf elongation leaves plant height temperature treatment Triticum aestivum
Agricola Code
IND89063909
GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: PPS-90-854
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||