Effects Of Salt Stress On Growth And Physiological Characteristics Of Salix Przewalskii And Salix Przewalskii Seedlings

In this study,we used the Hoagland nutrient solution hydroponic method to study the growth traits and photosynthetic characteristics of the SalixבChuibao109' and Salix matsudana var.anshanensis under normal conditions.The effects of dry salt stress on the growth traits and physiological characteristics of the seedlings of the genus 110 and the Phyllostachys pubescens were studied under different salt stresses.The results showed that:(1)After 45 days of culture,the number of leaves,the leaf length,the fresh weight of the leaves,the root length,the number of roots,and the base diameter of SalixבChuibao109'differed no significant difference compared with the Salix matsudana var.anshanensis.The leaf width,the leaf spacing,the dry weight of the leaves,the new branch length,the fresh weight of the branches,the dry weight of the branches,the fresh weight of root,and the dry weight of SalixבChuibao109' were significantly higher than that of Salix matsudana var.anshanensis(p<0.01).The water content of the leaves,branches and roots of the SalixבChuibao109'were lower than that of the Salix matsudana var.anshanensis.The SalixבChuibao109' had higher root-shoot ratio,indicating that its root system is more active.(2)There was a significant difference in the net photosynthetic rate between the SalixבChuibao109' and Salix matsudana var.anshanensis,and the Pn value showed SalixבChuibao109'> Salix matsudana var.anshanensis under different light intensities.The light saturation point(LSP)and the light compensation point(LCP)of the SalixבChuibao109' were lower than the Salix matsudana var.anshanensis,indicating that the Salix matsudana var.anshanensis has strong light intensity utilization ability,and it is exposed to glare.Growth and development are not easily inhibited when irradiated;while the SalixבChuibao109'had a stronger ability to use weak light.(3)The effect of salt stress on the roots of SalixבChuibao109' and Salix matsudana var.anshanensis was characterized that low salt concentration improved the root growth,stem growth,and biomass accumulation,however,high salt concentration inhibited the root and stem growth and biomass accumulation,and stress increased with the extension of time.According to the salt concentration on the growth and biomass inhibition,it can be seen that the SalixבChuibao109' had better salt tolerance than the Salix matsudana var.anshanensis.(4)The SalixבChuibao109' and the Salix matsudana var.anshanensis can adapt to the salt stress by increasing the chlorophyll content,SOD activity and POD activity.The chlorophyll content,the activity of SOD and POD of the SalixבChuibao109' and Salix matsudana var.anshanensis gradually increase with the salt stress.With the increase of salt concentration,the soluble protein and soluble sugar content of the leaves of the SalixבChuibao109' and the Salix matsudana var.anshanensis increased.Under the low salt concentration treatment,there was no significant difference in the soluble protein and soluble sugar content between the leaves of the SalixבChuibao109' and the Salix matsudana var.anshanensis.The content of soluble sugar and soluble protein in the leaves of the SalixבChuibao109' were significantly higher than that of the Salix matsudanavar.anshanensis.Through the study of this experiment,the effects of salt stress on growth index,chlorophyll content and antioxidant enzyme activities of SalixבChuibao109' and Salix matsudana var.anshanensis were studied,and the internal mechanism of response to salt stress of SalixבChuibao109' and Salix matsudana var.anshanensis was explored.The protection and introduction of afforestation in saline-alkali areas provides some scientific theoretical basis.