Effect of salinity stress on germination and heterotrophic growth of wild okra (Corchorus olitorius L.) seeds
Journal Title: Journal of Research in Ecology - Year 2016, Vol 4, Issue 1
Abstract
An experiment was laid out in order to evaluate the effect of salinity stress on seed germination, seedling growth and heterotrophic growth of wild okra at the laboratory of horticulture, Faculty of Gorgan Agricultural and Natural Resources University, Iran, March 2015. In this experiment treatments were different salinity stress levels of NaCl (0, -2, -4, -6, -8 and -10 bar). 25 seeds of each lot evenly placed on Whatman filter paper No.1 in sterilized 9-cm petri dishes separately and 10 ml of Nacl solution at different concentration were added . Seed germination parameters, seedling growth and heterotrophic growth components were determined. The results showed that, the effect of salinity stress was significant on germination percentage, germination rate, hypocotyl and radicle dry weight, seedling length, seed vigor index, seed reserves utilization, conversion efficiency of mobilized seed reserve and ratio of utilized seed reserve. Mean comparison data showed that maximum germination percentage, germination rate, radicle dry weight, seedling length, seed vigor index and seed reserves utilization were recorded for -2 bar water potential and the lowest of them was recorded for the -10 bar water potential (severe salinity stress) for all traits. Maximum hypocotyl dry weight were recorded at -2 bar saline stress treatment. Moreover, maximum conversion efficiency of mobilized seed reserve and ratio of utilized seed reserve was founded at -8 bar saline stress treatment and minimum of them was recorded for -10 bar water potential. The results of the study showed that increasing of saline stress in wild okra decreased seed germination parameters, seedling growth and heterotrophic growth components
Authors and Affiliations
Madeh Ahmadi, Sahar Zamani, Hadi Salehpoor, Zahra Rahmati Motlagh
Keywords
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