【摘要】 [目的]研究在3种水分条件下接种深色有隔内生真菌(DSE)菌株沙门外瓶柄霉(Exophiala salmonis)对芦苇生长及其生理特性的影响。[方法]采用盆栽试验的方法,从芦苇生长指标、渗透调节物质、抗氧化酶活性、叶绿素含量等方面研究DSE对芦苇幼苗的接种效应。[结果]在水分正常条件下,接种DSE的芦苇幼苗生物量增加21.8%,可溶性糖含量增加19.1%,脯氨酸大幅增加70.2%,SOD活性提高27.7%,CAT活性提高18.4%(P<0.05);水淹胁迫下,接种DSE后芦苇与对照相比在生物量、地径、叶绿素含量方面差异显著(P<0.05),分别增加了42.8%、14.3%和34.4%,而可溶性糖和脯氨酸含量则分别降低20.7%和11.0%;干旱胁迫下,接种DSE后芦苇生物量和叶绿素含量分别减少13.3%和23.2%,可溶性糖、SOD和CAT分别降低17.7%、73.7%和10.8%,MDA含量反而提高40.3%(P<0.05)。[结论]在正常水分下,接种DSE对宿主生长和光合作用有明显的促进作用,渗透调节能力和抗氧化能力都有显著提高;水淹胁迫下,接种DSE对芦苇的生长有一定促进作用,可通过渗透调节作用降低水淹环境对植物的伤害;干旱胁迫下,芦苇的光合作用、渗透调节作用和抗氧化能力均有所降低,抗旱性与抗逆性也都有所下降,此条件下DSE对芦苇生长产生不利影响。双因素方差分析结果表明,接种DSE和不同水分条件均对芦苇各项生长及生理指标产生显著影响(P<0.05),其中水分条件对芦苇的苗高、地径、鲜重和MDA含量产生极显著影响(P<0.001),接种DSE对芦苇根系活力、可溶性糖、SOD和CAT含量有极显著影响(P<0.001)。更多还原

【Abstract】 [Objective]In order to study the effects of Phragmites australis inoculated with DSE on the growth and physiological characteristics of reeds under three water conditions. [Method]This experiment used pot experiment to study on the inoculation effect of DSE on reed seedlings from various aspects such as plant growth index, osmotic adjustment substance, antioxidant enzyme activity and chlorophyll content. [Result]Under normal water condition, the biomass of reed seedlings inoculated with DSE increased by 21.8%, the soluble sugar content increased by 19.1%, the proline increased by 70.2%, the SOD activity increased by 27.7%, and the CAT activity increased 18.4%(P<0.05). Under flooding stress, there was significant difference in biomass, ground diameter and chlorophyll content of reeds after inoculation with DSE compared with the control(P<0.05), which increased by 42.8%, 14.3% and 34.4%, respectively. While the content of soluble sugar and proline decreased by 20.7% and 11.0%, respectively. Under drought stress, the biomass and chlorophyll content of reed decreased by 13.3% and 23.2%, respectively. Soluble sugar, SOD and CAT decreased by 17.7%, 73.7% and 10.8%, respectively, and MDA increased by 40.3%(P<0.05). [Conclusion] Under normal water condition, inoculation of DSE can significantly promote the growth and photosynthesis of the host, and the osmotic adjustment ability and antioxidant capacity are significantly improved. Under the flooding stress, DSE has a certain promoting effect on the growth of reed, which can reduce the damage of plants in flooded environment through osmotic adjustment. Under drought stress, photosynthesis, osmotic adjustment and antioxidant capacity of reeds were all reduced, and drought resistance and stress resistance were also reduced. Under this conditions, DSE had an adverse effect on the growth of reeds. Two-way analysis of variance showed that DSE and different water conditions had significant effects on the growth and physiological indexes of reeds, and different water conditions had an extremely significant effect on the fresh weight, seedling height, ground diameter and MDA content of reeds(P<0.001). DSE has an extremely significant effect on the root activity, soluble sugar, SOD and CAT content of reeds(P<0.001).更多还原