期刊
PLANT AND SOIL
卷 346, 期 1-2, 页码 189-199出版社
SPRINGER
DOI: 10.1007/s11104-011-0809-8
关键词
Arbuscular mycorrhiza; Chlorophyll fluorescence; Gas exchange; High temperature stress; Water status
资金
- National Nature Science Foundation of China [31000679]
- Chinese Academy of Sciences [KSCX2-YW-N-077]
The purpose of this study was to investigate the effects of arbuscular mycorrhizal (AM) symbiosis on gas exchange, chlorophyll fluorescence, pigment concentration and water status of maize plants in pot culture under high temperature stress. Zea mays L. genotype Zhengdan 958 were cultivated in soil at 26/22A degrees C for 6 weeks, and later subjected to 25, 35 and 40A degrees C for 1 week. The plants inoculated with the AM fungus Glomus etunicatum were compared with the non-inoculated plants. The results showed that high temperature stress decreased the biomass of the maize plants. AM symbiosis markedly enhanced the net photosynthetic rate, stomatal conductance and transpiration rate in the maize leaves. Compared with the non-mycorrhizal plants, mycorrhizal plants had lower intercellular CO2 concentration under 40A degrees C stress. The maximal fluorescence, maximum quantum efficiency of PSII photochemistry and potential photochemical efficiency of mycorrhizal plants were significantly higher than corresponding non-mycorrhizal plants under high temperature stress. AM-inoculated plants had higher concentrations of chlorophyll a, chlorophyll b and carotenoid than non-inoculated plants. Furthermore, AM colonization increased water use efficiency, water holding capacity and relative water content. In conclusion, maize roots inoculated with AM fungus may protect the plants against high temperature stress by improving photosynthesis and water status.
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