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http://dx.doi.org/10.5333/KGFS.2011.31.3.269

Mycorrhizal Colonization Effects on Some Physiological Parameters Related to Drought Stress in White Clover  

Park, Sang-Hyun (Chonnam National University)
Zhang, Qian (Chonnam National University)
Kim, Tae-Hwan (Chonnam National University)
Publication Information
Journal of The Korean Society of Grassland and Forage Science / v.31, no.3, 2011 , pp. 269-276 More about this Journal
Abstract
To investigate the physiological effects of mycorrhizal colonization on drought stress tolerance in white clover, the responses of leaf water potential (${\Psi}_{PL}$), relative water content (RWC), leaf dry mass, photosynthesis rate, transpiration, stomatal conductance, proline and ammonia were assessed periodically during 7 days in non-AM and AM plants under wellwatered 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 stomatal con ductance 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.
Keywords
Trifolium repens; Drought; Arbuscular mycorrhiza; Leaf water potential; Photosynthetic parameters; Ammonia; Proline;
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