VA菌根真菌对酸枣实生苗抗旱性的影响

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

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 2 0 %、 4 0 %、 6 0 %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 1g干物质的需水量低于不接种的处理 ,节水效果为 16 .5 %～ 2 9.8%。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 4 0d开始控水两个水分试验对菌根的侵染率。

Effects 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).