两种土壤基质条件下鸡眼草对水分胁迫和丛枝菌根真菌的响应  

Responese of Kummerowia striata to Arbuscular Mycorrhizal Fungi and Soil Drought Stress under Two Growth Substrates

作　　者：耿彬[1] 徐礼根[1] 唐建军[1] 丁伟华[1] 傅庆林[2] 陈欣[1] 

机构地区：[1]浙江大学生命科学学院,杭州310058 [2]浙江省农业科学院环境资源与土壤肥料研究所,杭州310021

出　　处：《科技通报》2008年第3期315-319,378,共6页Bulletin of Science and Technology

基　　金：浙江省科技厅项目(2004C13001;2007C22070;2005C12025-2);浙江省教育厅项目(20070169)

摘　　要：盆栽实验条件下，研究了种植在两种土壤基质的豆科草本植物鸡眼草（Kummerowia striata）对水分胁迫和丛枝菌根真菌的响应。水分处理为对照（土壤相对含水量为70％～80％）和中度干旱胁迫（土壤相对含水量为45％～55％），菌根真菌处理为接种和不接种处理。结果表明，水分和基质均影响菌根真菌的侵染率，水分胁迫降低侵染率，条件较好的基质1菌根真菌的侵染率明显高于条件较差的基质2。两种基质条件下，接种菌根真菌都显著降低叶片丙二醛含量（P〈0．05）但提高了可溶性糖含量、增加了鸡眼草的分枝数和提高了鸡眼草的地上部分和地下部分生物量。干旱胁迫处理，基质1下菌根真菌提高植物抗旱性的效果为4．29％，而基质2下菌根真菌提高植物抗旱性的效果为11．29％。A pot experiment was conducted on the effects of mycorrhizal fungi and soil substrate types on the response of Kurnrnerozr, ia striata to the drought stress. Non-AMF （arbuscular mycorrhizal fungi）and AMF treated plants were grown under well-watered （control） or drought-stressed conditions. MDA（malondialdehyde） and soluble sugar content in leaf, branch numbers, root and shoot biomass were determined. Results showed that both drought stress and soil substrate treatments impacted mycorrhizal colonization rate. AM fungi inoculation decreased leaf MDA content but increased leaf soluble sugar content significantly under both grouth conditions. MDA content decreased but soluble sugar content increased under nutritional media（soil substrate 1） compared to impoverished media （soil substrate 2）. AM fungi inoculation increased the branches, and shoot and root biomass of K. striata. Under drought stress, AM fungi increased the plant drought resistance by 4.29% under soil 1 condition while 11.29% under soil 2 condition. Both AM fungi and soil 1 could enhance the drought tolerance of K. striata.

关 键 词：内生菌根真菌 鸡眼草 土壤基质 耐旱性 

分 类 号：Q143[生物学—生态学]