落叶果树2025，Vol.57Issue(5)：16-20,5.DOI:10.13855/j.cnki.lygs.2025.05.004
镁与多巴胺复合物提升杜梨幼苗耐盐碱性研究
Binary ligand dopamine enhances saline-alkali tolerance in Pyrus betulaefolia seedlings
摘要
Abstract
As an important plant growth regulator,dopamine can effectively mitigate the damage caused by saline-alkali stress.However,dopamine tends to self-polymerize in aqueous solutions to form polydopamine,thereby compromising its stress-alleviating capacity.When Mg2+combines with dopamine to form a magnesium complex,it can effectively inhibit the self polymerization reaction of dopamine.To investigate the characteristics of magnesium complex and its alleviating effect on saline-alkali stress in pear seedlings,this study conducted relevant research.The results showed that at room temperature,Mg2+coordinated with dopamine to form Mg/DA,which could inhibit DA auto polymerization,and UV spectroscopy showed that Mg2+did not significantly alter the chemical structure of DA.Under saline-alkali stress,the leaves of Du pear seedlings treated with polydopamine showed significant chlorosis and growth inhibition.The K+and Na+levels in the leaves and roots decreased significantly,and the K+/Na+ratio decreased significantly.However,the growth of pear seedlings treated with Mg/DA was good,close to the control of water,and the relief effect was significant;The decrease in K+and the increase in Na+in the leaves and roots of pear seedlings treated with Mg/DA were the smallest,and the K+/Na+ratio was the closest to CK,which could maintain ion balance;The expression levels of PbHKT1,PbNHX1,and PbSOS1 genes in leaves and roots were significantly increased,suggesting that they alleviate saline-alkali stress by promoting Na+efflux or compartmentalization.关键词
杜梨/盐碱胁迫/多巴胺/自聚/镁多复合物/离子含量/基因表达Key words
Pyrus betulaefolia/saline-alkali stress/dopamine/self-polymerization/Mg/DA/ion content/gene expression分类
农业科技引用本文复制引用
许华振,白海秀,冯守千..镁与多巴胺复合物提升杜梨幼苗耐盐碱性研究[J].落叶果树,2025,57(5):16-20,5.基金项目
山东省良种工程(2019LZGC008)优质高档梨突破性新品种选育. （2019LZGC008）
