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The cyclophilins genes are induced by abiotic stresses, yet their detailed function in drought and salinity remain largely unclear and need to be elaborately validated. Expression of cyclophilin was drastically induced under drought conditions in Gossypium herbaceum L. suggesting its stress-responsive function. In an attempt to characterize the role of G. herbacuem cyclophilin gene GhCYP1, we over expressed the GhCYP1 in tobacco using Agrobacterium mediated transformation and explored its possible involvement in drought and salt stress tolerance. The transgenic plants over expressing GhCYP1 exhibited tolerance against drought stress as evidenced by leaf disc assay, estimation of chlorophyll and proline content along with various physiological parameters such as stomatal conductance, rate of photosynthesis and water use efficiency. The drought stressed transgenic tobacco plants exhibited higher proline content in leaf ( 1.84 μ mol-g fw) and root (2.02μ mol-g fw ), while a reverse trend was observed in the drought stressed wild type plants, implicating the involvement of GhCYP1 in the maintenance of physiological homeostasis. The detail physiological, biochemical and molecular analysis results demonstrate the implicit role of GhCYP1 in conferring multiple abiotic stress tolerance at whole-plant level.

biosciences biotechnology research asia/biosciences biotechnology research asia

Gossypium Herbaceum Ghcyp1 Regulates Water-Use Efficiency and Drought Tolerance by Modulating Stomatal Activity and Photosynthesis in Transgenic Tobacco