Reversal of Low Temperature Effects on a Tropical Plant by Gibberellic Acid
1971
Karbassi, P. | Garrard, L. A. | West, S. H.
SummaryPangolagrass plants (Digitaria decumbens Stent.) exposed to 10C night temperature had increased starch contents and decreased amylolytic activities, dry weights, leaf areas, and shoot lengths as compared with control plants exposed to 30C night temperatures. Application of 10⁻⁵ M gibberellic acid (GA₃) reversed these effects of 10C night temperature. The direct addition of GA₃ to the reaction mixture did not alter the in vitro amylolytic activity of crude leaf extracts of pangolagrass during their incubation either at 10C or 30C, which indicates that perhaps the effect of low temperature was on synthesis of amylolytic enzymes.
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