Abstract
The objective of this study was to investigate the effects of arbuscular mycorrhizal fungus (AMF) inoculation on growth and drought tolerance of Poncirus trifoliata seedlings. The seedlings were inoculated with or without Glomus mosseae before exposure to a short-term (3 days) water depletion, and relevant physiological and biochemical parameters (plant height, chlorophyll content, relative water content, activity of antioxidant enzymes) and expression patterns of several stress-responsive genes were examined. Inoculation with G. mosseae led to growth promotion of the seedlings, as revealed by larger plant height and higher relative water and chlorophyll contents. When subjected to drought treatment, the AMF-inoculated (AM) plants showed better tolerance than the nonmycorrhizal (NAM) plants. Under drought, the AM plants exhibited higher level of proline and activity of two antioxidant enzymes, superoxide dismutase (SOD) and peroxidase (POD). In addition, mRNA abundance of four genes involved in reactive oxygen species homeostasis and oxidative stress battling was higher in the AM plants when compared with the NAM plants. These results indicate that AMF inoculation stimulated growth and enhanced drought tolerance of the seedlings, which may be due to activation of an arsenal of physiological, biochemical and molecular alterations.
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Abbreviations
- AMF:
-
Arbuscular mycorrhizal fungus
- EL:
-
Electrolyte leakage
- POD:
-
Peroxidase
- ROS:
-
Reactive oxygen species
- RT-PCR:
-
Reverse transcriptase PCR
- RWC:
-
Relative water content
- SOD:
-
Superoxide dismutase
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Acknowledgments
This work was supported by the National Natural Science Foundation of China, the Ministry of Education of China (20090146110010), Hubei Provincial Natural Science Foundation (2009CDA080), the Fok Ying Tong Education Foundation (No. 114034). The authors are grateful to Peng Wang for technical assistance.
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Communicated by J. Zwiazek.
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Fan, QJ., Liu, JH. Colonization with arbuscular mycorrhizal fungus affects growth, drought tolerance and expression of stress-responsive genes in Poncirus trifoliata . Acta Physiol Plant 33, 1533–1542 (2011). https://doi.org/10.1007/s11738-011-0789-6
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DOI: https://doi.org/10.1007/s11738-011-0789-6