Mycorrhizal Colonization Effects on Some Physiological Parameters Related to Drought Stress in White Clover
2011
Park, S.H., Chonnam National University, Gwangju, Republic of Korea | Zhang, Qian, Chonnam National University, Gwangju, Republic of Korea | Kim, T.H., Chonnam National University, Gwangju, Republic of Korea
To investigate the physiological effects of mycorrhizal colonization on drought stress tolerance in whitε clover, the responses of leaf water potential (Ψ∧PL), relative water content (RWC), leaf dry mass, photosynthesis rate, transpiration, stomatal conductance, proline and ammonia were assessed periodically during 7days in non-AM and AM plants under well-watered or drought-stressed conditions. Under well-watered conditions, the examined parameters were not significantly changed or very little affected by AM symbiosis. Drought decreased water potential, relative water content, photosynthesis rate, transpiration and stornatal conductance by 68.6%, 22.7%, 97.7%, 83.9% and 84.9%, respectively, in non-AM plants, meanwhile 46.8%, 13.4%, 50.3%, 44.8% and 54.7%, respectively, in AM plants. In addition, drought increased ammonia and proline by 31.8% and 162%, respectively, in non-AM plants, while 20.9% and 76.9%, respectively, in AM plants. These results clearly showed that mycorrhizal colonization significantly relieved the responses of physiological parameters to drought stress in white clover.
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