Growth and photosynthetic efficiency promotion of sugar beet (Beta vulgaris L.) by endophytic bacteria

文献类型： 外文期刊

第一作者： Shi, Yingwu

作者： Shi, Yingwu;Lou, Kai;Shi, Yingwu;Li, Chun

作者机构：

关键词： sugar beet;photosynthesis;Bacillus pumilus;Acinetobacter johnsonii

期刊名称：PHOTOSYNTHESIS RESEARCH （ 影响因子：3.573； 五年影响因子：3.674 ）

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收录情况： SCI

摘要： Very little is known about the physiological interactions between plants and endophytic bacteria. We investigated the impact of three endophytic bacteria, Bacillus pumilus 2-1, Chryseobacterium indologene 2-2, and Acinetobacter johnsonii 3-1, on the photosynthetic capacity and growth of sugar beet. Endophyte-free plants were obtained first and infected with the bacteria. Measurements of total chlorophyll content revealed very significant differences between endophyte-free beet plants and some infected by endophytic bacteria. The maximum photochemical yield (Fv/Fm) was used to determine any photosynthetic effect on plants caused by biotic or abiotic factors. After 30 days of growth, there was significantly higher Fv/Fm for endophyte-infected than endophyte-free plants. The light response curves of beet showed that photosynthetic capacity was significantly increased in endophyte-infected plants. Photosynthesis of endophyte-free plants was saturated at 1,300 omol mpo sp#, whereas endophyte-infected plants were not saturated at the irradiance used. The effect seemed to be due to promotion of electron transport in the thylakoid membranes. Promotion of photosynthetic capacity in sugar beet was due to increased chlorophyll content, leading to a consequent increased carbohydrate synthesis. It is possible that the increased maximum yield of photosynthesis in sugar beet was promoted by phytohormones and produced by the bacteria.

分类号： Q94

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