盐胁迫下不同树龄枸杞各器官的盐离子分布

以甘肃景泰沿黄灌区栽植的枸杞(Ly cium barbarum L.)为研究对象,研究了盐胁迫下不同树龄枸杞各器官的盐离子分配.结果表明,1~2年生枸杞各器官的K 分布为幼叶>成叶>嫩茎,而3~4年生枸杞为幼果>嫩茎>幼叶>成叶;1~4年生枸杞成叶的N a 含量分别为1.273%、1.414%、0.689%和0.497%;不同年龄枸杞成叶、幼叶、嫩茎和幼果的N a /K 平均值分别为2.425%、1.397%、0.489%和0.301%;随枸杞年龄的增加,根对土壤中N a 、K 的选择吸收比值(SA)逐渐增加.枸杞选择性吸收K 、拒N a 的特性和分配较多N a 、C l-给耐盐性较强的器官(成叶)是枸杞耐盐的重要原因.

Salty Ion Distributions in Different Organs of Lycium barbarum L.at Different Ages under Salt Stress

Lycium barbarum L.planted in the Yellow River-irrigated area located in Jingtai county of Gansu province was used to study salty ion distributions in different organs of L.barbarum at different ages.The results showed that K~ increased in its distribution in the order of young leaves,adult leaves and young shoots in 1~2-year-old L.barbarum and in the order of young fruits,young sterms,young leaves and adult leaves in 3~4-year-old L.barbarum;the Na~ contents in the adult leaves of L.barbarum at the ages of 1~4 years were 1.273%,1.414%,0.689% and 0.497%,respectively;the average Na~ /K~ ratios in the adult leaves,young leaves,young stems and young fruits of L.barbarum at different ages were 2.425%,1.397%,0.489% and 0.301%,respectively;with the age of L.barbarum increasing,its roots increasingly took up soil Na~ and K~ by selective absorption.The features that L.barbarum takes up more K~ than Na~ by selective absorption and allocates more Na~ and Cl~-to the organs(adult leaves) with higher salt-tolerating capacity are the important reasons why L.barbarum can tolerate salts.