摘要
为探究八棱海棠耐盐的离子响应机制,以耐盐海棠无性系(编号NY)和普通海棠无性系(编号PT)为试材,经不同浓度Na Cl溶液(0、2、4、6、8、10 g·L^(-1))处理后,统计植株受害情况,测定并分析不同器官中矿质离子(Na^(+)、K^(+)、Ca^(2^(+))、Mg^(2^(+)))积累、运输和分布情况。结果表明:Na Cl浓度高于6 g·L^(-1)时,两个株系均出现了盐害症状,NY株系盐害指数和死亡率低于PT株系;盐胁迫促进了两个株系不同器官中Na^(+)及NY株系叶K^(+)含量的积累,抑制了NY株系根和PT株系根、茎、叶K^(+)的积累,Na Cl浓度高于2 g·L^(-1)时,NY株系根中Na^(+)含量高于PT株系,茎、叶中Na^(+)含量低于PT株系;盐胁迫下,两个株系根、茎、叶中的K^(+)/Na^(+)、Ca^(2^(+))/Na^(+)和Mg^(2^(+))/Na^(+)比值呈现不同程度下降,各处理下,NY株系茎和叶中各比值高于PT株系;随着盐浓度的增加,NY株系由根向地上部选择性运输离子的能力先升高后降低,PT株系则逐渐下降,各处理下,NY株系向地上部选择性运输离子的能力高于PT株系。推测NY株系较PT株系具有较强耐盐性的离子原因为:盐胁迫下NY株系较少积累Na^(+)并将吸收的Na^(+)较多截留在根中,增加营养离子向地上部运输,维持了叶片相对离子平衡。
In order to explore the ion response mechanism of salt tolerance in Malus micromalus,salt-tolerant and ordinary clonal strains (named as NY and PT,respectively) were used as test materials,and treated with Na Cl concentrations of 0,2,4,6,8 and 10 g·L^(-1).After the treatment,we counted the damage of the plants,measured and analyzed the accumulation,transportation and distribution of mineral ions (Na^(+),K^(+),Ca^(2^(+))and Mg^(2^(+))) in different organs.The results showed that when the Na Cl concentration was higher than6 g·L^(-1),both strains showed symptoms of salt damage,and the salt damage index and mortality of the NY strain were lower than those of PT strain.Salt stress promoted the accumulation of Na^(+)in roots,stems and leaves of the two strains and increasing of K^(+)content in leaves of NY strain.Salt stress inhibited K^(+)accumulation in the roots of NY strain and in the roots,stems and leaves of PT strain.When the Na Cl concentration was higher than 2 g·L^(-1),the Na^(+)content in the roots of NY strain was higher than that of PT,but the Na^(+)content in stems and leaves was lower than that of PT.Under salt stress,the ratios of K^(+)/Na^(+),Ca^(2^(+))/Na^(+)and Mg^(2^(+))/Na^(+)in the roots,stems and leaves of the two strains decreased to varying degrees.Under each treatment,the iron ratios in the stem and leaf of NY strain were higher than those of PT strain.With the increase of salt concentration,the ability of ion selective transport from roots to shoots in NY strain increased first and then decreased,while gradually decreased in PT strain.Under each treatment,the ability of ion selective transport to the shoots in NY strain was higher than that in PT strain.It is speculated that the reason why NY strain has stronger salt tolerance than PT strain is:under salt stress,NY strain accumulates relatively less Na^(+)and retains more absorbed Na^(+)in the roots,increases nutrient ion transport to the ground and maintains the relative ion balance of leaves.
作者
胡爱双
张小栋
郭文静
孙宇
王文成
李凯超
HU Aishuang;ZHANG Xiaodong;GUO Wenjing;SUN Yu;WANG Wencheng;LI Kaichao(Coastal Agricultural Research Institute,Hebei Academy of Agriculture and Forestry Sciences,Tangshan,Hebei 063299,China;Research Center of Saline and Alkali Land of National Forestry and Grassland Administration,Beijing 100091,China;Hebei Saline and Alkali Land Greening Engineering Technology Center,Tangshan,Hebei 063299,China)
出处
《植物生理学报》
CAS
CSCD
北大核心
2021年第9期1829-1838,共10页
Plant Physiology Journal
基金
河北省农林科学院现代农业科技创新功能项目(2019-1-6-2)
河北省农林科学院基本科研业务费项目(2018010104)
唐山市科技计划项目(20150211C)。
关键词
盐胁迫
八棱海棠
离子平衡
离子吸收与运输
salt stress
Malus micromalus
ion balance
ion absorption and transportation
