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Int. J. Mol. Sci. 2018, 19(9), 2636; https://doi.org/10.3390/ijms19092636

Molecular and Physio-Biochemical Characterization of Cotton Species for Assessing Drought Stress Tolerance

1
Institute of Crop Science, College of Agriculture and Biotechnology, Zijingang Campus, Zhejiang University, Hangzhou 310058, China
2
Examination Control Section, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh
*
Author to whom correspondence should be addressed.
Received: 31 July 2018 / Revised: 24 August 2018 / Accepted: 31 August 2018 / Published: 6 September 2018
(This article belongs to the Section Molecular Plant Sciences)
Full-Text   |   PDF [3436 KB, uploaded 6 September 2018]   |  

Abstract

Drought stress significantly limits cotton growth and production due to the necessity of water at every stage of crop growth. Hence, it is essential to identify tolerant genetic resources and understand the mechanisms of drought tolerance in economically and socially important plants such as cotton. In this study, molecular and physio-biochemical investigations were conducted by analyzing different parameters by following standard protocols in three different cotton species, namely TM-1 (Gossypium hirsutum), Zhongmian-16 (Gossypium arboreum), and Pima4-S (Gossypium barbadense). Drought stress significantly decreased plant growth, chlorophyll content, net photosynthetic rate (Pn), stomatal conductance (Gs), maximum photochemical efficiency of PSII (Fv/Fm), and relative water content. TM-1 resulted in more tolerance than the other two species. The accumulation of proline, soluble proteins, soluble sugars, hydrogen peroxide (H2O2), and superoxide radicals (O2) increased significantly in TM-1. In addition, TM-1 maintained the integrity of the chloroplast structure under drought conditions. The relative expression level of drought-responsive genes including coding for transcription factors and other regulatory proteins or enzymes controlling genes (ERF, ERFB, DREB, WRKY6, ZFP1, FeSOD, CuZnSOD, MAPKKK17, P5CR, and PRP5) were higher in TM-1 under drought, conferring a more tolerant status than in Zhongmian-16 and Pima4-S. The findings of this research could be utilized for predicting a tolerant cotton genotype as well as evaluating prospective cotton species in the variety development program. View Full-Text
Keywords: drought; drought tolerance; abiotic stress; antioxidant defense; oxidative stress; cotton drought; drought tolerance; abiotic stress; antioxidant defense; oxidative stress; cotton
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Hasan, M.M.-U.; Ma, F.; Prodhan, Z.H.; Li, F.; Shen, H.; Chen, Y.; Wang, X. Molecular and Physio-Biochemical Characterization of Cotton Species for Assessing Drought Stress Tolerance. Int. J. Mol. Sci. 2018, 19, 2636.

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