Bioscience Biotechnology and Biochemistry · 1999 · 49 citations · 8 references
Life SciencesPlant BiologyPlant SciencesPlant BiochemistryPlant Molecular BiologyPlant PhysiologyPlant GrowthPlant Growth RegulationPlant Hormone PhysiologyPlant HormonesSeedling Growth SuppressionTemperature ResponsesCell Proliferation StimulationChlorophyll Content MeasurementGrowth Responses To StressHormonal Control Of GrowthNight Temperature EffectsPlant Growth Regulator EffectsPlant Heat Stress PhysiologyStress-induced Growth Regulation
In order to investigate the function of the peptidyl plant growth factor, phytosulfokine-alpha (PSK-alpha), in plants, we examined the effect of PSK-alpha on the growth and chlorophyll content of Arabidopsis seedlings under high night-time temperature conditions. Although exposure to high night-time temperatures markedly reduced the fresh weight and chlorophyll content of the seedlings, these parameters in the plants supplied with PSK-alpha remained at the same levels as those of non-treated controls. These effects were not apparent when [2-5]PSK, Tyr-SO3H and kinetin were similarly supplied. The results suggest that PSK-alpha not only promotes cell proliferation, but may aid plants in their tolerance of heat stress.
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