哈茨木霉LTR-2对蔬菜种子和幼苗耐盐性的影响及其作用机制

研究了盐胁迫条件下哈茨木霉LTR 2处理对黄瓜、萝卜和番茄3种蔬菜的种子萌发、幼苗生长和生理生化反应的影响。结果表明，盐胁迫条件下，LTR-2处理的蔬菜种子萌发率明显高于未处理；LTR-2处理的蔬菜幼苗的株高、鲜重、叶片中叶绿素含量、净光合作用速率（Pn值）以及抗氧化酶活性明显高于未处理，而膜质损伤（相对电导率和丙二醛含量）弱于未处理的幼苗。哈茨木霉LTR-2能够促进盐胁迫下蔬菜种子的萌发以及幼苗的生长和光合作用，提高幼苗的抗氧化能力并降低膜质损伤，增强幼苗对盐胁迫的耐受性。

Impact and mechanism of Trichoderma harzianum strain LTR-2 on salt tolerance of vegetable seeds and seedlings

We addressed the impact of Trichoderma harzianum strain LTR-2 on seed germination, seedling growth and physiological and biochemical response of cucumber, radish and tomato under salinity stress. Results show that germination rate of vegetable seeds treated with LTR-2 is significantly higher than that of seeds untreated with LTR-2 under NaCl stress. Shoot length, fresh weight, chlorophyll content, net photosynthetic rate (Pn value) and antioxidant enzyme activity of vegetable seedlings treated with LTR-2 are significantly higher than those of seedlings without LTR-2 treatment. However, relative conductivity and MDA content are less than those without LTR-2 treatment. This indicates that T. harzianum strain LTR-2 can stimulate germination of vegetable seeds, growth and photosynthesis of seedlings, improve antioxidant capacity of seedlings, reduce membrane damage, and enhance salt tolerance of seedlings.