Abstract
Sewan (Lasiurus sindicus Henr.) is an endemic fodder grass of low rainfall sandy habitat of hot Indian Thar desert. To understand drought responses and tolerance mechanism in Lasiurus sindicus, seedling growth, root cell viability, changes in enzymatic antioxidants and oxidative injury were assayed at early stage of seedlings in polyethylene glycol (PEG) 6000 (5, 10 and 20%)-induced drought stress. The reduction of seed germination, seedling growth, relative water content and vigor index was found with high level of PEG (10–20%), while 5% PEG slightly increased the germination and the growth parameters. A decline in pigments (Chl a, Chl b, total Chl, carotenoids), chlorophyll stability index, membrane stability index and protein content was observed, which was correlated with increased level of malondialdehyde, an indicator of excess reactive oxygen species. Results showed that increasing level of PEG activated the antioxidative enzymes, superoxide dismutase, peroxidase and catalase. Non-enzymatic antioxidants (ascorbate, phenols) and accumulation of cytosolutes (proline and sugar) for regulation of growth, osmotic potential and reactive oxygen species in drought tolerance. Overall results showed that seeds have adaptive mechanisms for germination and growth under lower level of drought, while increasing drought stress reduced growth potential of L. sindicus. It exhibited drought tolerance features, enhancement in activity of antioxidative enzyme and cytosolutes accumulation which involved in regulation of oxidative damage and osmotic adjustment for survival of the seedlings. Furthermore, our results provide important information about the physiological and antioxidative responses of the seedlings and mechanism associated with drought tolerance of L. sindicus.
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Acknowledgements
We are grateful to the Science and Engineering Research Board (SERB) (SB/YS/LS 137/2013), New Delhi, Govt. of India, for financial support through major research project. We wish to acknowledge the Rashtriya Uchhatar Shiksha Abhiyaan (RUSA), New Delhi, India, and Centre of Advanced Study (CAS) Programme of University Grant Commission (UGC), New Delhi, India, for providing additional support. Council of Scientific and Industrial research (CSIR), New Delhi, India, is acknowledged for the senior research fellowship (SRF) (09/098(0127)/2015-EMR-I) to BG. BRG acknowledges Indian Academy of Sciences, Bangalore, India, for award of Summer Research Fellowship.
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BG and RR grew seeds, performed the experiments and also prepared first draft of the manuscript. BG analyzed the data. BRG designed and guided the experiments and wrote the manuscript in the final version. All authors reviewed and approved the manuscript.
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Goswami, B., Rankawat, R. & Gadi, B.R. Physiological and antioxidative responses associated with drought tolerance of Lasiurus sindicus Henr. endemic to Thar desert, India. Braz. J. Bot 43, 761–773 (2020). https://doi.org/10.1007/s40415-020-00666-9
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DOI: https://doi.org/10.1007/s40415-020-00666-9