丛枝菌根真菌对枳根系形态和蔗糖、葡萄糖含量的影响

Effects of arbuscular mycorrhizal fungi on root system morphology and sucrose and glucose contents of Poncirus trifoliata

研究丛枝菌根真菌接种（摩西球囊霉、地表球囊霉和摩西球囊霉＋地表球囊霉）对盆栽枳的生长、根系形态以及蔗糖、葡萄糖含量的影响．结果表明：3个接种处理都显著提高枳的株高、茎粗、叶片数，以及地上部和地下部生物量，诱导l级、2级和3级侧根的发生，同时增加了根系投影面积、表面积、体积和总长度（主要是0—1cm根长），但降低根系平均直径，其中以地表球囊霉效果最明显．丛枝菌根真菌接种显著提高枳的叶片蔗糖和根系葡萄糖含量，但降低叶片葡萄糖和根系蔗糖含量．由于根系“菌根碳库”的存在，丛枝菌根真菌接种导致根系维持较高的葡萄糖和较低的蔗糖含量，从而有利于宿主根系的生长和发育，建立更优的根系形态．

The effects of inoculation with Glomus mosseae, G. versiforme, and their mixture on plant growth, root system morphology, and sucrose and glucose contents of trifoliate orange （Poncirus tri- foliata L. ） were studied by pot culture. The results showed that all the inoculated treatments signif- icantly increased the plant height, stem diameter, leaf number, and shoot and root biomass. In ad- dition, the mycorrhizal treatments significantly increased the number of 1st, 2nd, and 3rd lateral roots. Inoculation with arbuscular mycorrhizal fungi significantly increased the root projected area, surface area, volume, and total root length （mainly 0-1 cm root length）, but decreased the root average diameter. Meanwhile, G. versiforme showed the best effects. Mycorrhizal inoculation signif- icantly increased the leaf sucrose and root glucose contents, but decreased the leaf glucose and root sucrose contents. Owing to the ＇ mycorrhizal carbon pool＇ in roots, inoculation with arbuscular my- corrhizal fungi resulted in high glucose content and low sucrose content of roots, which would facili- tate the root growth and development, thereby the establishment of better root system morphology of host plants.