铝胁迫对感染丛枝菌根真菌的樟树幼苗生长的影响

Effects of Aluminum Stress on Growth of Cinnamomum camphora Seedlings Inoculated with AMF

采用不同浓度的铝(Al)溶液胁迫接种和不接种丛枝菌根的香樟幼苗的方法,研究生长10周后的植株幼苗的形态、生物量以及不同器官的磷(P)含量和植物激素水平对环境胁迫的响应。结果表明:在Al3+浓度为0和0·5mmol·L-1的轻度胁迫下,接种植株的形态、生物量、P和植物激素水平等大部分指标要显著好于不接种的植株;而在Al3+浓度为8和15mmol·L-1的中、重度胁迫下,则略好或接近不接种的植株。菌根显著增加轻度和中度胁迫下植株叶片细胞分裂素(ZR)含量以及根部生长素(IAA)和ZR含量,降低叶片和根部脱落酸(ABA)含量;同时,樟树幼苗的形态、生长与P含量和不同器官植物激素含量之间显著相关。接种丛枝菌根给予植株一定的抗Al毒特性。

Mycorrhizal and non-mycorrhizal Cinnamomum camphora （camphor tree） seedlings were exposed to Al^3＋ levels of 0, 0.5, 8 and 15 mmol· L^-1 in acid solutions for 10 weeks. We evaluated if arbuscular myeorrhizas （AM） and its host＇ growth could be responsible for the tolerance to acid solutions with different Al^3 ＋ level. The results showed that as far as morphology and biomass of aboveground and belowground were concerned, mycorrhizal plants had higher resistance to Al than non-mycorrhizal plants with 0 and 0.5 mmol· L^-1 Al^3 ＋ in acid solutions; mycorrhizal plants appear better or similar with non-mycorrhizal plants with 8 and 15 mmol· L^-1 Al^3 ＋ in acid solutions. Mycorrhiza significantly increased ZR contents of leaves and IAA ＆ ZR contents of roots, decreased ABA contents of leaves and roots. At the same time, the index of growth, morphology and P content is significantly correlated with phytohormones contents in different organs. Our results indicated the AM fungal consortium confer Al resistance to camphor tree seedlings.