丛枝菌根真菌对烟草钾素吸收的研究

在盆栽条件下研究了接种AM真菌Glomus mosseae对烤烟K素吸收的影响。结果表明，施钾量与AM真菌对烤烟K累积量与分配有明显的影响，对烤烟不同时期生长、不同叶位含钾量影响显著(P<0．01)。菌根菌与施钾量二者组合对烤烟烟叶含钾量的提高作用在生长中、后期最为显著，接种AM真菌对烤烟整株烟叶含钾量的影响，主要是提高了上、中、下位叶的含钾量，进而提高了整株烟叶的含钾量；接种AM真菌提高了钾在叶中的分配比例。降低了K在茎中的分配比例，比较而言，在0．75～1．125g·kg^-1施钾(K2O)水平，AM真菌对烤烟K的累积与分配及含钾量的作用效果最佳。

Effects of AM fungi on potassium absorption of flue-cured tobacco

The effects of AM fungus Glomus mosseae inoculation on the potassium absorption of flue-cured tobacco were studied with un-sterilized soil in a pot experiment. Potassium application and AM fungi inoculation had a significant influence on potassium accumulation and distribution, and the difference of potassium contents among different growth stages and different leaf positions was significant (P< 0. 01). Different combinations of AM fungi inoculation and potassium application had an obvious influence on potassium content in tobacco leaf during the middle and later growth stage. AM fungi inoculation could enhance the potassium content of top, middle, and beneath position leaf, and hence, the content of potassium in leaf was increased, but that in stem was relatively lower.