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草业学报  2014 

丛枝菌根真菌对白三叶根系构型和糖含量的影响

DOI: 10.11686/cyxb20140124, PP. 199-204

Keywords: 白三叶草,丛枝菌根,根系构型,蔗糖,葡萄糖

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Abstract:

以白三叶为材料,在盆栽条件下研究丛枝菌根真菌粘屑多样孢囊霉(Diversisporaspurca)、地表球囊霉(Glomusversiforme)和隐类球囊霉(Paraglomusoccultum)对其叶绿素含量、根系构型及组织蔗糖和葡萄糖含量的影响。结果表明,接种85d后白三叶根系菌根侵染率为66.80%~82.51%。3种丛枝菌根真菌都增加地上部、地下部和植株总干物质量,其中地表球囊霉的效果最显著。接种丛枝菌根真菌处理也显著地改善根系构型参数,如长度、投影面积、表面积、体积、根尖数、分支数和交叉数,但因真菌种类而异,其中地表球囊霉的效果最明显。丛枝菌根真菌接种同时显著提高叶绿素含量,达36%~58%,也显著增加叶片和根系的蔗糖和葡萄糖含量,除地表球囊霉侵染的根系蔗糖含量下降外。菌根侵染率与叶片葡萄糖(r=0.852,P<0.01)、叶片蔗糖(r=0.722,P<0.01)和根系葡萄糖(r=0.884,P<0.01)均呈极显著正相关关系。文章讨论了丛枝菌根-糖-根系构型三者的关联。

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