Effects of Exogenous Substances on the Growth and Physiological Characteristics of Malus halliana under Salt-alkali Stress
In order to explore effects of melatonin and 2,4-epibrassinolide to alleviate the damage of combined salt-alkali stress on Malus halliana,in this experiment,the seedlings of Malus halliana with 9 to 10 leaf ages were used as the test material.Three treatments were set,i.e.,200 μmol/L melatonin spray,200 μmol/L melatonin+0.2 mg/L 2,4-table brassinolide overlay spray and 0.2 mg/L 2,4-table brassinolide spray,to study the effects on chlorophyll content,relative conductivity,water content,antioxidant enzyme activity,free proline content and photosynthetic fluorescence parameters of leaves under salt-alkali stress.The results showed that exogenous application of melatonin and 2,4-epbrassinolide could significantly improve the relative conductivity,proline content and antioxidant enzyme activity of leaves under salt-alkali stress,and reduce the relative water content and chlorophyll content of leaves,so as to alleviate the inhibition of salt-alkali stress on the growth of Malus linus.In this experiment,the alleviating effect from high to low was melatonin,2,4-epbrassinolide,and the combination of the two.
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