干旱胁迫对桃叶杜鹃菌根苗生长的影响

通过设置4个水分胁迫处理和3个接种处理，测定菌根苗木的根系形态、苗高、生物量、根冠比等指标，分析在干旱胁迫下不同菌根真菌对桃叶杜鹃生长效应的影响。结果表明：在正常水分条件下，接种ERM菌株显著提高了幼苗的苗高、叶面积，增加了幼苗地上部分与地下部分的生物量积累, 促进了桃叶杜鹃幼苗的生长。在轻度水分胁迫下，桃叶杜鹃各处理苗的根系总根长、表面积及苗高均较其他处理高。但随着胁迫加剧，对照处理的苗高、叶面积逐渐降低，菌根苗的苗高在轻度胁迫时有所升高，而后随之下降，菌根苗叶面积下降幅度均小于对照。接种不同的菌株促生效果也不同，接种TY35比接种TY29对桃叶杜鹃幼苗在受到干旱胁迫时的缓解效果好。

Effects of Drought Stress on the Growth of Rhododendron annae Mycorrhizal Seedlings

Four water stress treatments and 3 inoculation treatments were set up to determine the root morphology, seedling height, biomass, root/shoot ratio of mycorrhizal seedlings. The effects of different mycorrhizal fungi on the growth of Rhododendron amurensis under drought stress were analyzed.Result showed that under normal water conditions, inoculation of ERM significantly increased seedling height, leaf area, and the biomass accumulation of aerial parts and underground parts of seedlings, and promoted the growth of R.annae. Under mild water stress, length and surface area of root and seedling height were higher than those of other treatments. However, with the aggravation of stress, the seedling height and leaf area of CK decreased gradually. The seedling height of mycorrhizal seedlings increased with mild stress, and then decreased. The decrease of mycorrhizal seedling leaf area was less than that of CK. Inoculation of different strains of promoting growth effect was also different. Inoculation TY35 had better mitigation effects than inoculation TY29 on R.annae seedlings under drought stress.