丛枝菌根真菌对NaCl胁迫下番茄内源激素的影响

EFFECT OF ARBUSCULAR MYCORRHIZAL FUNGI ON TOMATO ENDOGENOUS UNDER NaCl STRESS

采用盆栽试验研究了不同浓度NaCl(0.3%、0.6%和1.0%)胁迫下,接种丛枝菌根真菌Glomusmosseae-2对番茄内源激素的影响。结果表明:(1)盐胁迫下,植株生长受抑,生长促进物质IAA、GA3和Zeatin含量下降,生长抑制物质ABA含量增加,接种Glomus mosseae-2增加了植株干物质量和这些激素的含量;(2)菌根形成过程中,Glomus mosseae-2参与调节内源激素平衡,降低了叶片ABA/IAA、ABA/GA3、ABA/Zeatin及ABA/(IAA+GA3+Zeatin)的比值;(3)气孔导度(gs))和ABA/Zeatin值呈极显著负相关,同一盐浓度胁迫下,接菌株有较高gs和较低的ABA/Zeatin值。ABA和Zeatin共同调节气孔对盐胁迫的响应,维持接菌株较高的气孔导度,增强了番茄的耐盐性。

Effect of arbuscular mycorrhizal fungi on tomato endogenous under NaCl stress（0.3%,0.6%,1%） was studied.The result showed as followes：（1）Under salt stress,plant growth and content of endogenous IAA,GA3,Zeatin in leaves and roots of tomato were decreased,but the content of ABA increased,whereas AMF inoculation improved dry weight and the content of these endogenous hormones.（2） Glomus mosseae-2 adjusted the balance of endogenous hormones and decreased the ratio of ABA/IAA,ABA/GA3,ABA/Zeatin and ABA/（IAA ＋ GA3 ＋ Zeatin） compared to corresponding control plants.（3）The correlation analysis showed a significant reverse relation between gs and the ratio of ABA/Zeatin.AM（AMF in oculation） tomato had higher gs and lower ratio of ABA/Zeatin than that of corresponding non-AM plants.So,ABA and Zeatin adjusted response of stoma to salt stress jointly and kept higher gs than non-AM ones which lead to higher salt tolerance.