Effects of Exogenous Spermidine on Growth and Physiology of Garden Chrysanthemum Under Saline-alkali Stress
Taking garden Chrysanthemum'Jiangyue'as the test material to study the effects of different concentrations of exogenous Spd on the growth(plant height,stem thickness,leaf length,leaf width,dry and fresh weight)and physiological indicators(photosynthetic pigments,water status,organic osmotic regulators,antioxidant enzyme activity)of garden Chrysanthemum under saline-alkali stress,in order to provide reference for solving the problem of saline-alkali stress in cultivation and management of graden Chrysanthemum in northorn China.The results showed that the growth indicators of Chrysanthemum seedlings treated with exogenous Spd were significantly higher than those of saline-alkali treatment.Exogenous spraying of Spd could significantly increase the relative water content,chlorophyll content,antioxidant enzyme activity,and intracellular organic osmotic regulatory substances of Chrysanthemum seedlings leaves,while reduce the content of malondialdehyde.Spraying Spd with a concentration of 1.5 mmol·L-1 on the leaves under saline-alkali stress had the best effect,which could improve the stress resistance of garden Chrysanthemum plants,effectively alleviate the phenomenon of plant wilting and dwarfing caused by saline-alkali stress,and provide reference basis for the application of exogenous hormones in Chrysanthemum production.
Chrysanthemum morifoliumresistance to saline-alkaliphysiological characteristicsexogenous spermidine
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