3种球囊霉属真菌对盆栽木薯生长影响

应用盆栽试验法，单独接种球囊霉属Glomus菌种：根内球囊霉G．intraradices（Gi）、木薯球囊霉Gmanihotis（Gm）和幼套球囊霉Getunicatum（Ge）菌剂及混合菌剂（2G），检测不同接种条件下对盆栽木薯Manihot esculenta根系的侵染能力及其对木薯生长的影响．3个试验菌种均可与木薯形成疆南星型（Arum—type）丛枝菌根（arbuscular mycorrhiza，AM），其中Gi和Gm均可在菌根内形成根内孢子．2G和Gi均显示较强的侵染能力，Gm在早期的侵染较慢，但在后期的感染率较高，Ge侵染能力最差．2G、Gi和Gm处理组木薯的高度生长均比非接种处理的对照组好，但只有2G处理组无论株高生长还是生物积累均达到显著水平，其他处理组差异不显著，Ge处理组木薯在叶部和根部生物量的积累有负向影响．

The effects of three Glomus fungi on growth of Manihot esculenta

The infective abilities of three mycorrhizal species of Glomus intraradices(Gi),Glomus manihotis(Gm) and Glomus etunicatum(Ge),to the roots of cassava,Manihot esculenta,and their effects on growth of cassava were studied by potted culture.All three arbuscular mycorrhizae(AM) fungi could form the typical Arum-type structure of AM after inoculation.Amony them,both Gi and Gm could produce spores within the roots.The inocula of Gi and the mixed Gi and Gm(2G) showed faster and higher infective abilities, while that of Gm had slower infection rates at the early stages of cassava growth.However,the infection rates of Gm remained more stable in the late stages than those of Gi and 2G.By comparison,the infective ability of Ge inoculum was poor.All the treatments including Gi,Gm and 2G showed greater growth in height than those in controlled treatment(control,CK).However,only 2G had significant difference from CK in both height growth and aboveground biomass accumulation at harvest.Differences among Gi,Gm and CK were not significant.The biomass of cassava with Ge inoculation was even lower than CK,which might reveal that Ge had a negative effect on cassava growth.