丛枝菌根对酸枣实生苗耐盐性的影响

EFFECTS OF ARBUSCULAR MYCORRHIZAE ON SALT TOLERANCE OF WILD JUJUBE (ZIZYPHUS SPINOSUS HU)SEEDLINGS

本文研究了在土中加入不同量NaCl条件下 (0、1 5、3 0、4 5gkg-1干土 )接种丛枝菌根真菌 (AMF)Glomusmosseae对盆栽酸枣 (ZizyphusspinosusHu)实生苗生长及耐盐性的影响。结果表明 ,无论接种与否 ,植株的高度、根茎叶的干鲜重均随土壤NaCl浓度的增加而降低 ,而根、茎、叶和整株的Na浓度及Na全量均随土壤NaCl浓度的增加而增大。在土壤盐浓度相同的条件下 ,接种AMF植株的生长量 (株高、鲜重、干重等 )和叶片的叶绿素含量显著高于不接种植株。接种AMF的植株茎、叶中Na浓度低于不接种植株 ,而根中Na浓度、植株Na总量显著高于不接种植株。盐浓度最大的接种处理 ,其植株生长量和叶片叶绿素含量均高于不加盐不接菌处理。播种时进行盐胁迫处理和播种后 4 0d开始进行盐胁迫处理对菌根的侵染率、植株生长的影响差异不显著。上述四种盐浓度播种时进行盐处理的接种AMF植株的总干重比不接种植株分别提高 16 4 %、14 9%、4 8%、35 % ,在播种后 4 0d进行盐处理的接种AMF的植株比不接种植株分别提高 194 %、12 7%、72 %、4 6 %。结果证明 ,酸枣实生苗具有较强的耐盐性 ,其生长对菌根真菌有很强的依赖性 ,接种菌根真菌提高了其耐盐能力。

The effects of AMF (Glomus mosseae) on growth and salt tolerance of pot wild jujube seedlings (Zizyphus spinosus Hu) at different levels of NaCl added into soil (0, 1.5, 3.0, 4.5 g kg -1 of dry weight soil) were studied. The results showed that the height, fresh weight, dry matter weight of roots, leaves and shoots of AMF inoculated and uninoculated plants decreased while the Na concentrations of roots, leaves, shoots and whole plant increased with the increasing doses of NaCl added into the soil. The height, fresh weight, dry matter weight in different parts of plant and the leaf chlorophyll concentrations were significantly higher for AMF inoculated plants than for uninoculated plants grown under the same levels of NaCl. The Na concentrations of shoot and leaf were lower while the Na concentrations of root and the Na content of whole plant were significantly higher for inoculated plants than for uninoculated plants. The growth and leaf chlorophyll concentrations were higher for AMF inoculated plants grown under highest leve of NaCl (4.5 g kg -1 ) than for uninoculated plant grown under no NaCl added into the soil. No significant differences in growth and root colonization were found between plants with salt treatment just after sowing and plants with salt treatment 40 days after sowing. The gross dry weight of AMF plants with salt treatment just after sowing increased 164%, 149%, 48%, 35%, respectively, at the 0, 1.5, 3.0, 4.5 g kg -1 NaCl of the dry weight soil, compared with that of uninoculated plants, and that with salt treatment 40 days after sowing increased 194%, 127%, 72%, 46%, respectively. The results indicated that wild jujube seedlings were salt tolerant plant, the growth of the plant heavily relied on AM, and the AMF inoculated plants had greater tolerance to salt stress than uninoculated plants.