Effects of Plant Hormones Interaction Under Salt Stress on Growth of Roselle (Hibiscus Sabdarifa L.)

Abstract

Salinity has reached a level of 19.5% of all irrigated land agriculture worldwide. One of the most important abiotic factors limiting plant germination and early seedling stages is water stress brought about by salinity. The aim of this study was to evaluate effects of plant hormones interaction under salt stress on growth of roselle. This study was conducted in a greenhouse, University of Sumatra Utara, Medan. The study used completely randomized design with three factors. The first factor was GA3 were GA3 (5 mg L-1 ) and no GA3. The second factor was SA were 0 mM, 0,5mM and 1 mM. The third factor was salinity were 0 dsm-1 and 4-5 dsm-1 . The interaction of GA3 and Salt Stress indicated significant effect on percentage of germination and cuticle thickness. The interaction of three factors of GA3, SA and salt stress indicated significant effect on thick cuticle where GA3+no SA+no salinity treatment was the highest then followed no GA3+0,5mMSA+no salinity treatment and no GA3 + 1 mMSA+no salinity was the lowest. The application of GA3 and SA helped in the tolerance of plants to salt stress. Thus, plant hormones have been found effective in mitigating the salt induced damage in plant.