Extensive host range of an endophytic fungus affects the growth and physiological functions in rice (Oryza sativa L.)

文献类型： 外文期刊

第一作者： Yuan, Zhi-Lin

作者： Yuan, Zhi-Lin;Dai, Chuan-Chao;Li, Xia;Tian, Lin-Shuang;Wang, Xing-Xiang

作者机构：

关键词： extensive host range;endophytic fungi;rice;symbiosis

期刊名称：SYMBIOSIS （ 影响因子：2.268； 五年影响因子：2.471 ）

ISSN： 0334-5114

年卷期： 2007 年 43 卷 1 期

页码：

收录情况： SCI

摘要： Endophytic Phomopsis sp. was isolated from the inner bark of Bischofia polycarpa. Many previous studies indicated that endophyte was ubiquitous and located within extensive host ranges, and indirect evidence had shown that Phomopsis sp. Might be an "inducible mutualism" endophyte and horizontally transmitted. Nevertheless, little attention was paid to whether an inducible endophyte can locate into non-host plant tissues, and how it influences plant physiological mechanisms still remains unclear. In the present study, we attempted to inoculate the endophyte into rice, hypothesizing that inducible endophytes could have particular beneficial effects on non-host plants. Inoculation and infection tests proved that the endophyte established a symbiotic relationship with the rice plant and existed in the leaf tissue. Then we tested the hypothesis in two ways. First, the effects of diluted endophyte inoculum on the germination of seeds were evaluated. Second, at the seedling stage (4-leaf stage), seedlings in pots were treated with the endophyte inoculum under controlled environmental conditions. Parameters including numbers of tillers, plant height, chlorophyll content, photosynthetic rate, grain yield, and antioxidant enzyme activity were measured. These parameters differed between endophyte-infected and endophyte-free plants, especially at the germination and seedling stages, being significantly greater in endophyte-infected plants; however, the endophyte made no obvious contribution to the grain yield of rice. The results revealed that the endophyte promoted growth, antioxidant enzyme activity, and photosynthesis. Therefore, endophytic Phomopsis sp. may be useful as a growth-promoting microbial agent for enhancing the vigor and optimizing the quality of plants in agriculture, horticulture, and forestry.

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