长枝木霉 T6菌株对小麦耐盐性的影响

摘要

This research aimed to determine the effect of Trichoderma longibrachiatum T6 on wheat salinity toler-ance .The salinity tolerance of T . longibrachiatum T6 and its effect on wheat salinity tolerance were determined and sim-ulated by different concentrations of NaCl solutions .Results showed that NaCl solutions had significant effect on growth of T . longibrachiatum T6 under the concentrations ranging from 30 to 50 mg·mL-1 ,with the effect increasing as NaCl concentration increased .But as the incubation time prolonged ,the effect decreased gradually .However ,compared with control ,there existed no significant effect with NaCl concentrations of between 10 and 20 mg·mL-1 .In addition ,the strain of T . longibrachiatum T6 had significant promoting effect on wheat seed germination rates ,germination potential , germination index ,plumule and radicle length by NaCl treatments ,increased by 3% ~15% ,6% ~14% ,4% ~16% , 9% ~34% and 9% ~31% ,respectively .Therefore , T . longibrachiatum T6 has a stronger salinity tolerance and pro-moting effect on plant growth under salt stress .%利用NaCl溶液模拟盐胁迫条件，测定了长枝木霉T6菌株耐盐性及其对小麦耐盐性的影响。结果表明：当NaCl溶液浓度为30～50 mg·mL－1时，其对长枝木霉T6菌株生长具有显著的抑制作用，并且其影响作用随着NaCl溶液浓度的升高而增强，随着处理后培养时间的增加而逐渐减小，但当NaCl溶液浓度为10、20 mg·mL－1时，与对照相比其对长枝木霉T6菌株生长无显著影响，且表现出较强的耐盐性；长枝木霉T6菌株对NaCl溶液胁迫下小麦种子的发芽率、发芽势、萌发指数、胚芽和胚根长度具有明显的促生作用，且与对照相比分别增加了3％～15％、6％～14％、4％～16％、9％～34％和9％～31％。因此，长枝木霉T6菌株具有较强的耐盐性和解盐促生作用。