丛枝菌根真菌对百喜草的生理特性的影响

采用盆栽法研究了丛枝菌根（AM）真菌摩西球囊霉（Glomus mosseae）对水分胁迫条件下百喜草（Paspalum notatum）生长、渗透调节及抗氧化酶的影响。结果表明：接种AM真菌显著提高了百喜草的株高、地上部与根部鲜重、地上部P、K、Mn及根部P、Ca、Mn含量，明显降低了地上部Zn及根部Fe、B、Cu水平；随着干旱程度的加深，接种株的地上部相对含水量及叶绿素含量相对稳定且均显著高于未接种株，接种株地上部相对电导率、MDA含量均显著低于未接种株，接种株的地上部POD活性与脯氨酸含量均显著增加且均显著高于未接种株，AM侵染对SOD活性的影响较小。可见，接种AM真菌Glomusmossecte提高了植株体内保护酶活性（如POD）及渗透调节能力（如脯氨酸、P、K、Ca等渗透调节物含量的增加），从而显著增强了百喜草的抗旱性。

Effects of Arbuscular Mycorrhizal Fungi on Physiological Character of Bahia Grass ( Paspalum notatum, Poaceae)

The effects of arbuscular mycorrhizal (AM) fungus,Glomus mosseae,on growth,osmotic adjustment and antioxidant enzymes of bahia grass (Paspalum notatum) were studied in potted plants under water stress conditions.AM colonization significantly enhanced the plant height,root and shoot fresh weight,Phosphorus (P),potasium (K),manganese (Mn) contents in shoots,P,calcium (Ca),Mn contents in roots,whereas obviously decreased zinc (Zn) content in shoots,iron (Fe),boron ( B),copper (Cu) contents in roots.During water stress,the relative water and chlorophyll contents were relatively stable and signifciantly higher in AM than in non-AM plants,AM inoculation notabley decreased the shoot relative conductivity and malondialdehyde (MDA) content,markedly increased shoot peroxidase (POD) activity and proline content,while AM infection did not affect the dismutase (SOD) activity of shoots.Our results suggested that AM colonization improved the protective enzyme activity (such as POD) and osmotic adjustment originating from proline P,K,Ca,resulting in the enhancement of drought tolerance.