VA 菌根真菌对酸枣实生苗抗旱性的影响

 在盆栽条件下, 研究了VA 菌根对酸枣实生苗生长和抗旱性的影响。结果表明, 在土壤相对含水量为20 %、40 %、60 %条件下, VA 菌根能显著增加酸枣实生苗的生长量(株高、叶面积、鲜样质量、干样质量等) , 降低叶片自然饱和亏和脯氨酸含量, 提高植株叶片气孔导度、蒸腾速率、光合速率, 显著增强了植株的抗旱能力。在土壤相对含水量相同状况下, 接种菌根真菌植株制造1 g 干物质的需水量低于不接种的处理, 节水效果为16. 5 %～29. 8 %。干旱条件对VA 菌根的侵染影响不大。播种时进行控水处理和在播种后40 d 开始控水两个水分试验对菌根的侵染率、植株的生长及水分状况影响差异不大。

Effects of VA Mycorrhizal Fungi Inoculated on Drought Tolerance of Wild Jujube(Zizyphus spinosus Hu) Seedlings

of VA mycorrhiza on growth , water status of wild jujube ( Zizyphus spinosus Hu) seedlings grown in pots were studied. As contrasted to the controls , VAM could increase plant growth ( such as plant height , leaf area , fresh and dry mass) , enhance leaf relative water content, photosynthetic rates, transpiration rates , stomatal conductance and improve plant drought tolerance significantly when the relative water content of soil was 20 % , 40 % , 60 % respectively. The water consumption of the mycorrhizal plants producing one gram dry matter was from 16. 5 percent to 29. 8 percent less than that of nonmycorrhizal plants under the same soil water content condition. The VAM colonization , the growth of plants , water status of plants had no definitely difference between the water experiment Ⅰ (Water treatments started from sowing) and Ⅱ (Water treatments started from 40 days after sowing) .