Abstract
The present study investigated drought-induced responses of non-enzymatic antioxidants in four diverse mulberry genotypes (Morus indica L. S-36, M-5, MR-2 and V-1). Inside the glasshouse, potted plants were subjected to four water regimes for 75 days: (a) control: pots maintained at 100% pot water holding capacity (PC) (b) low water stress: 75% PC (c) medium water stress: 50% PC and (d) high water stress: 25% PC. Photosynthetic leaf gas exchange and non-enzymatic antioxidants including α-tocopherol, ascorbic acid (AA), glutathione, proline and total carotenoids were measured in leaves at regular intervals. Amongst all, V-1 was relatively drought tolerant and showed exceeded accumulation of α-tocopherol and AA-glutathione pool in association with higher carotenoids and proline contents. Susceptible S-36, M-5 and MR-2 could not induce any significant up-regulation in AA-glutathione pool leading to endogenous loss of α-tocopherol and more lipid peroxidation. Reactive oxygen species (ROS) like hydrogen peroxide (H2O2) and superoxide (O2 · −) showed apparent accumulation in water-stressed leaves and significantly contributed to lipid peroxidation in susceptible genotypes when compared to V-1. Our study demonstrated that proline, AA and glutathione were the major non-enzymatic antioxidants in mulberry with α-tocopherol and carotenoids as good additional indicators for drought stress tolerance. These non-enzymatic antioxidants can cumulatively render effective protection against oxidative damage and can be considered as reliable markers for screening drought-tolerant mulberry genotypes.
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Acknowledgments
We acknowledge the financial assistance of Department of Science and Technology (DST), Government of India, New Delhi (Grant SR/SO/PS-27/05). We are grateful to Dr. S Masilamani, Scientist C (Regional Sericultural Research Station, Salem, India) for providing the mulberry cuttings. We acknowledge the Central Instruments Laboratory (CIL) of University of Hyderabad, Hyderabad, India for the help on Confocal Fluorescence Microscopy. A.G. gratefully acknowledges the research fellowship granted by DST, India and University of Hyderabad, India. D.G. and G.K.R acknowledge the senior research fellowships granted by CSIR (Council of Scientific and Industrial Research, Government of India). We also thank our field assistant Mr K. Vinod for raising and maintenance of mulberry saplings for this experiment.
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Guha, A., Sengupta, D., Rasineni, G.K. et al. Non-enzymatic antioxidative defence in drought-stressed mulberry (Morus indica L.) genotypes. Trees 26, 903–918 (2012). https://doi.org/10.1007/s00468-011-0665-4
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DOI: https://doi.org/10.1007/s00468-011-0665-4