Effects of saline-alkali stress on seedling growth and physiology of male Populus tomentosa improved variety
[Objective]The basic principle of afforestation is to match species with the site.Populus tomentosa is widely distributed in north China Plain,the middle and upper reaches of the Yellow River plain and other regions,and there are different types of saline alkali land in these regions.Therefore,the study of the impact of saline alkali stress on male P.tomentosa improved varieties can provide technical support for the development and utilization of saline soil and the promotion and planting of improved seedlings in the future.[Method]The experiment used'Beilin Xiongzhu 1'as the experimental material for male P.tomentosa improved variety.The saline alkali environment was simulated by pot irrigation with saline water.The saline alkali types were divided into neutral salt NaCl,neutral mixed salt Na2SO4+NaCl,alkaline salt NaHCO3,and alkaline mixed salt Na2CO3+NaHCO3.Set high and low concentrations of 150 and 300 mmol·L-1 for different types of saline alkali.[Result]Different types of salt alkali stress inhibited the growth of seedlings,and the inhibitory effect was more obvious at high concentrations.Neutral salt stress had a greater impact on the aboveground growth of plants.The height growth of seedlings under high concentrations of NaCl treatment decreased by 56.61%compared to the control,while alkaline salt stress had a stronger inhibitory effect on the root growth of plants;Alkaline salt stress significantly reduced the net photosynthetic rate of plants,while low concentrations of NaCl treatment enhanced their photosynthesis;The Na+content in the roots,stems,and leaves of plants significantly increased under salt alkali stress.Under neutral salt treatment,the ability of the roots to control Na+was stronger than under alkaline salt stress,and the ability of the plants to selectively transport nutrients from the roots was stronger than under alkaline salt stress.At high concentrations,the Na+content in the root to leaf SK,Na treated with Na2SO4+NaCl increased by 707.20%compared to the control,but as the concentration increased,the plant's ability to regulate ions was inhibited.[Conclusion]Overall,alkaline salt stress has a greater negative impact on the growth and physiological and biochemical characteristics of male P.tomentosa improved variety.
saline-alkali stressgrowthphotosynthesision balancemale Populus tomentosa
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