混合丛枝菌根真菌接种时期对滇重楼幼苗内源激素含量的影响

目的研究混合丛枝菌根(AM)真菌不同接种时期对滇重楼Paris polyphylla Smith var. yunnanensis幼苗内源激素含量的影响。方法室内盆栽法,分别将滇重楼种子、1年生苗、2年生苗接种混合AM真菌,于灭菌土壤基质中进行共生培养,采用高效液相色谱法测定内源激素玉米素核苷(ZR)、赤霉素(GA)、吲哚乙酸(IAA)和脱落酸(ABA)含量。结果混合AM真菌对不同时期,不同种源的滇重楼根状茎和根中内源激素ZR、GA、IAA、ABA含量变化的影响不尽相同。整体上,与对照组比较,野生种源和栽培种源滇重楼根状茎和根的ZR和GA内源激素含量均呈增加趋势,ABA含量均呈减少趋势。滇重楼根状茎和根中IAA/ABA、GA/ABA、ZR/ABA增大。结论 1年生苗期接种S2、S6型混合AM真菌,对促进滇重楼幼苗根状茎和根生长的综合效果最佳。

Effect of inoculation time of arbuscular mycorrhizal fungi on endogenous hormone content in Paris polyphylla var. yunnanensis seedlings

Objective To study the effect of the inoculation time of arbuscular mycorrhizal (AM) fungi on endogenous hormone content in Paris polyphylla var. yunnanensis seedlings. Methods The indoor pot test was applied. The seeds, one-year-old seedlings, and two-year-old seedlings of P. polyphylla var. yunnanensis were inoculated by different mixed AM fungi and cultivated in the sterilized soil matrix respectively. The contents of endogenous hormone zeatin riboside (ZR), gibberellin (GA), indole acetic acid (IAA) and abscisic acid (ABA) were determined by HPLC. Results The results showed that the endogenous hormone (ZR, GA, IAA and ABA) contents in rhizome and fibrous roots of P. polyphylla var. yunnanensis from different regions or different time inoculated by mixed AM fungi were various. As a whole, the contents of endogenous hormone ZR and GA increased obviously in the rhizome and fibrous roots of the wild and cultivated P. polyphylla var. yunnanensis compared with the control group (CK), while the content of ABA reduced. The IAA/ABA value, GA/ABA value and ZR/ABA value increased obviously in the rhizome and fibrous roots of P. polyphylla var. yunnanensis. Conclusion The one-year-old of P. polyphylla var. yunnanensis inoculated with S2 and S6 mixed AM fungi showed the best comprehensive effect for promoting growth of the rhizome and fibrous roots of P. polyphylla var. yunnanensis seedlings.