丛枝菌根提高百喜草抗旱性的机制研究(英文)  

Studies on Mechanisms Underlying Promotion of Arbuscular Mycorrhizas on Drought Resistance in Bahia Grass

作　　者：吴雪俊[1] 安静[1] 肖家欣[1] 杨安娜[1] 滑俊 杨博[1] 

机构地区：[1]安徽师范大学生命科学学院,安徽省重要生物资源保护与利用研究省级重点实验室,安徽芜湖241000

出　　处：《安徽师范大学学报（自然科学版）》2014年第1期47-52,57,共7页Journal of Anhui Normal University(Natural Science)

基　　金：Foundation items:National Natural Science Foundation of China(31372014);Anhui Provincial Natural Science Foundation(1308085MC37);the Provincial Natural Science Research Program of Higher Education of Anhui Province(KJ2012A128)

摘　　要：通过盆栽试验研究了水分充足和干旱胁迫下百喜草(Paspalum notatum)对丛枝菌根(AM)真菌Glomus mosseae、G.versiforme及G.mosseae+G.versiforme侵染的生理反应.AM真菌尤其是G.mosseae+G.versiforme接种处理显著减轻了干旱对生长的抑制.干旱胁迫下,接种株地上部P、K、Ca、Mg及根部N、P含量均显著高于未接种株,AM真菌接种处理显著提高了根围土壤酸性磷酸酶与过氧化氢酶活性及总球囊霉素含量.无论干旱胁迫与否,AM真菌接种处理增加了地上部POD活性,降低了地上部MDA含量,而地上部SOD活性并无显著性差异.干旱胁迫下,与未接种株相比,接种株可溶性糖与蛋白含量较高,而脯氨基酸含量却较低.可见,AM真菌尤其是G.mosseae+G.versiforme侵染有利于提高土壤酶活性,改善植株营养、渗透调节能力与抗氧化能力,进而促进了干旱胁迫下植株的生长.A lint culture experiment was conducted to study the physiological responses of bahia grass（ Paspalum notatum ）to arbuscular mycorrhizal（AM） fungi, Glomus mosseae, G. versiforme or G. mosseae ＋ G. versiforme colonization under ample water or drought stress. AM inoculation especially G. rnosseae ＋ G. versiforrne significantly alleviated the growth reduction of drought stress. Nitrogen （N）, phosphorus（P）, potassium, calcium and magnesium contents in shoots, N and P in roots of AM plants were higher than those in non-AM ones under drought stress. AM inoculation increased acid phosphatase and catalase activities, and total glomalin content in rhizosphere soils. Whether drought stress or not, AM inoculation increased shoot peroxidase activity and decreased shoot malondialdehyde content, although no significant difference was observed on shoot superoxide dismutase activity. Under drought stress, AM plants had higher soluble sugar and protein contents, but had lower proline content than those in non-AM ones. Results demonstrated that the benefit of AM colonization especially G. mosseae ＋ G. versiforme was due to the enhancement of soil enzymes, nutrition,osmoregulation and antioxidase matters in plants, leading to improvement of plant growth under drought stress.

关 键 词：丛枝菌根 百喜草 抗旱性 生理反应 

分 类 号：Q945[生物学—植物学]