Populus euphratica Ion Distribution,Absorption and Transport Characteristics at Different Growth Stages and Its Relationship with Soil Salinity
To explore the physiological mechanism of P.euphratica for adapting to the saline environ-ment and the relationship between the ion distribution of each organ of P.euphratica and soil ions at different growth stages,we used P.euphratica as the experimental material and utilized a method to analyze and compare the ion content of each organ of seedlings,young wood,near-mature wood,and over-mature wood.The selective uptake,distribution and transport characteristics of soil ions by vari-ous organs of P.euphratica were investigated through the content of each ion.The aim was to under-stand the effect of soil ions on P.euphratica at different growth stages.The results showed that:(1)with the change of growth and development stage of P.euphratica,the contents of Na+,Cl-,HCO3-and Ca2+in organs of P.euphratica generally increased,while the contents of K+,Mg2+and SO42-showed different trends.This indicates that P.maintains physiological stability by regulating the bal-ance between the ions.(2)Na+,K+,Ca2+,and Cl-at various developmental stages of Populus were mainly distributed in leaves and roots,while Mg2+,SO42-and HCO3-were different among different organs.P.euphratica improves salt exclusion or tolerance through ion distribution in different organs.(3)In the process of ion transport from root to leaf at each stage of development of P.euph-ratica,there were also differences in transport capacity,among these,seedlings and young wood exhib-ited strong K+absorption and transport capacity,while near-mature wood and mature wood exhibited strong Ca2+transport capacity.In conclusion,the results reflect the demand and utilization degree of different ions in different growth stages,enhancing the adaptability to the saline environment and forming an ion regulation mechanism to adapt to adverse conditions.
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