Exogenous Silicon on Hormones and Photosynthesis of Tomato under Drought Stress
The mitigation mechanism of silicon on drought stress has been reported,but the research on silicon's regulation of plant hormone metabolism and photosynthesis under drought stress is still insufficient.Therefore,hydroponics was used to add polyethylene glycol 6000(PEG 6000)to the nutrient solution to simulate drought stress,and to study the effect of exogenous silicon on tomato hormone and photosynthetic characteristic curve under drought stress.The research results show that although the content ratio of cornin nucleoside and shedding acid in the root system and leaves of silicon tomatoes under drought stress(ZR/ABA),the content ratio of auxin and abscisic acid(IAA/ABA),the content ratio of gibberellin and abscisic acid(GA/ABA)and stomatal conductivity are lower than that of the control.However,they are all higher than those without silicon treatment.In addition,the application of silicon makes tomatoes highly adaptable to the strong light environment.More light energy can be used to reduce light inhibition by improving the photosynthetic rate to protect the damage of the photosynthetic mechanism.Therefore,this study explores the photosynthetic properties of silicon on tomatoes affected by drought stress and the regulation of hormones such as ABA,and reveals the mechanism of silicon in regulating the photosynthetic process of plants under drought stress.
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