Salinity stress causes a major threat to crops productivity across the globe. The effects of salt stress on photosynthetic pigments and minerals content were studied in this research work. The seeds of the two genotypes of okra (47-4 and LD 88) were pre-soaked in the solutions of IAA (0.4, 0.5, and 0.6 mM concentrations) and the seeds were sown in 10 kg of soil in polyethene bags already contained 0, 100, and 200 mM NaCl respectively. Salinity stress significantly reduced photosynthetic pigments and minerals content of the two genotypes of okra. Treatment of okra seeds with IAA at varying concentrations improved salt tolerance of the two genotypes, which is evident with increase photosynthetic pigments and minerals concentrations under salinity stress relatives to the negative control groups. Finally, we can infer from the results of this study that pre-soaked seeds with 0.4 mM IAA significantly ameliorated the effects of salinity on the two genotypes of okra, and this concentration could serve as a promising phytohormone for okra plant under moderate and severe salt levels.
R. Mahalingam, “Consideration of combined stress: a crucial paradigm for improving multiple stress tolerance in plants,” in Combined Stresses in Plants, ed. R. Mahalingam (Berlin: Springer), pp.1–25, 2015.
M. Shahbaz, and M. Ashraf, Improving Salinity Tolerance in Cereals. Critical Reviews in Plant Sciences, vol. 32, pp. 237–249, 2013.
P. Rengasamy, Soil processes affecting crop production in salt-affected soils. Functional Plant Biology, vol. 37, pp. 613-620, 2010.
M. Foolad, Recent advances in genetics of salt tolerance in tomato. Plant Cell, Tissue and Organ Culture, vol. 76, pp. 101-119, 2004.
R. Munns, Comparative physiology of salt and water stress. Plant, Cell & Environment, vol. 25, pp. 239-250, 2002.
M. Hasanuzzaman, K. Nahar, M. Fujita, P. Ahmad, R. Chandna M. Prasad, and M. Ozturk, Enhancing Plant Productivity Under Salt Stress: Relevance of Poly-omics Salt Stress in Plants, pp. 113-156, 2013.
D. Paul, Osmotic stress adaptations in rhizobacteria. Journal of Basic Microbiology, vol. 52, 1-10, 2012.
A. A. Fajinmi, and O. B. Fajinmi, Incidence of okra mosaic virus at different growth stages of okra plants (Abelmosclues esculentus (L) under tropical condition. Journal of General and Molecular Virology, vol. 2, 028-031, 2010.
L. M. Dudley, A. Ben-Gal, and U. Shani, Influence of plant, soil and water on the leaching fraction. Vadose Zone Journal, vol. 7, pp. 420–425, 2008.
H. X. Lin, M. Z. Zhu, M. Yano, J. P. Gao, Z. W. Liang, W. A. Su, X. H. Hu, Z. H. Ren, and D. Y. Chao, QTLs for Na+ and K+ uptake of the shoots and roots controlling rice salt tolerance. Theor. Appl. Genet., vol. 108, pp. 253–260, 2004.
J. M. Pardo, Biotechnology of water and salinity stress tolerance. Curr. Opin. Biotechnol., vol. 21, pp. 185–196, 2010.
M. Hussain, H. W. Park, M. Farooq, H. Jabran, and D.J. Lee, Morphological and physiological basis of salt resistance in different rice genotypes. Int J. Agric Biol., vol. 15, pp. 113–118, 2013.
M. M. Hussein, L. K. Balbaa, and M. S. Gaballah, Salicylic acid and salinity effects on growth of maize plants. Res J Agric Biol Sci., vol. 3, pp. 321–328, 2007.
Y. F. Hu, G. Zhou, X. F. Na, L. Yang, W. B. Nan, X. Liu, et al., Cadmium interferes with maintenance of auxin homeostasis in Arabidopsis seedlings. J. Plant Physiol., vol. 170, pp. 965–975, 2013.
M. Asgher, M. I. R. Khan, N. A. Anjum, and N.A. Khan, Minimizing toxicity of cadmium in plants role of plant growth regulators. Protoplasma, vol. 252, pp. 399–413, 2015.
M. Iqbal, and M. Ashraf, Seed treatment with auxins modulates growth and ion partitioning in salt-stressed wheat plants. J Integr Plant Biol., vol. 49, pp.1003–1015, 2007.
H. Metzener, H. Rava, and H. Sender, Unter suchungen zur synchronis iebekiety pigments mangel von chlrella. Planta, vol. 65, pp.186-190, 1965.
H. D. Chapman, P. E. Pratt, Methods of analysis for soils, plants, and waters. Univ. of Calif., Div. Agric Sci Priced Pub., vol. 40 no. 34, pp. 50-169, 1978.
AOAC. (Association of Official Analytical Chemists). Official Methods of Analysis of the Association of Analytical Chemists International, 18th ed. Gathersburg, MD U.S.A. Official method, 2005.08. 2005.
X. L. Gong, C. Liu, M. Zhou, L.Y. Luo, L. Wang, Y. Wang, M. M. Hong, J. W. Cai, S. J. Gong, and F. S. Hong, Oxidative damages of maize seedlings caused by combined stress of potassium deficiency and salt stress. Plant Soil, vol. 340, 443–452, 2011.
E. Nazarbeygi, H. L. Yazdi, R. Naseri, and R. Soleimani, The effects of different levels of salinity on proline and A-, B- chlorophylls in canola. Amer-Eurasian J. Agric. Environ. Sci., vol. 10 no. 1, pp. 70-74, 2011.
A. M. Esan, K. Masisi, F. A. Dada, and C. O. Olaiya, Comparative effects of indole acetic acid and salicylic acid on oxidative stress marker and antioxidant potential of okra (Abelmoschus esculentus) fruit under salinity stress. Scientia Horticulturae Journal, vol. 216, pp. 278-283, 2017.