丛枝菌根真菌(AMF)对盐胁迫下芦笋幼苗生长及体内Na^+、K^+、Ca^(2+)、Mg^(2+)含量和分布的影响

Effects of arbuscular mycorrhizal fungi( AMF) on seedling growth and Na^+,K^+,Ca^(2+),Mg^(2+) contents and distribution in asparagus under salt stress

以芦笋盐敏感品种‘NJ978’为材料,采用盆栽试验,研究了接种丛枝菌根真菌(AMF)对Na Cl胁迫下芦笋幼苗生长及体内Na+、K+、Ca2+、Mg2+吸收和分布的影响。结果表明:在Na Cl胁迫下,幼苗株高、鲜重、干重均显著降低,接种AMF可以有效缓解盐胁迫对芦笋幼苗生长的抑制;Na Cl处理的芦笋幼苗根系和地上部Na+含量显著高于对照,K+、Ca2+、Mg2+的含量则显著减少;AMF+Na Cl处理的芦笋幼苗根系K+、Ca2+、Mg2+含量与Na Cl处理相比,分别增加了76.9%、23.1%和22.5%,而Na+含量则减少了27.4%;AMF+Na Cl处理的芦笋幼苗地上部K+、Ca2+、Mg2+含量与Na Cl处理相比,分别增加了58.4%、50.4%和76.0%,而Na+含量则减少了42.3%。与Na Cl处理相比,接种AMF可以降低盐胁迫下芦笋幼苗根系和地上部Na+/K+、Na+/Ca2+、Na+/Mg2+,提高根系选择吸收性ASK,Na、ASCa,Na、ASMg,Na和根系向地上部的选择运输性TSK,Na、TSCa,Na、TSMg,Na。由此表明,盐胁迫下接种AMF可以通过调节芦笋体内的离子平衡,从而缓解盐胁迫对植株的伤害。

The effects of arbuscular mycorrhizal fungi（ AMF） on contents and allocations of Na^＋,K^＋,Ca^2＋,Mg^2＋and growth of asparagus variety ‘NJ978＇under salt stress were studied in greenhouse. The results showed that the height,fresh weight and dry weight of the seedlings decreased significantly under Na Cl treatment,while the inhibition of seedling growth was alleviated by AMF-inoculation. Na^＋contents of asparagus roots and its aerial part under salt stress were higher than in the control,while the contents of K^＋,Ca^2＋and Mg^2＋decreased significantly. Under salt stress,AMF-inoculation increased the contents of K^＋,Ca^2＋and Mg^2＋of the seedling roots by 76.9%,23.1% and 22.5%,respectively,while the content of Na^＋decreased by 27.4%; the contents of K^＋,Ca^2＋and Mg^2＋of the seedlings aerial part increased by 58.4,50.4% and 76.0%,respectively,while the content of Na^＋decreased by 42.3%. Meanwhile,Na^＋/ K^＋,Na^＋/ Ca^2＋and Na^＋/ Mg^2＋in roots and aerial part of seedlings were significantly decreased by AMF-inoculation under salt stress,and the selective absorption of K^＋,Ca^2＋,Mg^2＋（ ASK,Na,ASCa,Na,and ASMg,Na）was significantly increased,and the selective transportation（ TSK,Na,TSCa,Naand TSMg,Na） were increased. These results indicated that AMF-inoculation could improve tolerance of asparagus seedlings to salt stress via regulating the uptake and allocation of ions in different organs.