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Pakistan Journal of Biological Sciences
Year: 2004  |  Volume: 7  |  Issue: 6  |  Page No.: 883 - 890

Effect of Alternating Saline and Non-saline Conditions on Emergence and Seedling Growth of Rice

M.Z. Alam, M.A.A. Bhuiya, M.A. Muttaleb and M.M. Rashid    

Abstract: A pot experiment in glasshouse was conducted with a single salinity level of 10.5 dS m-1 to study the effect of alternating saline and non-saline conditions on emergence and seedling growth of two rice cultivars (IR8 and V3) differing in salt tolerance. A split-plot design was used with three replications. The results demonstrated that rice seedlings, 1 to 3 weeks after emergence, proved to be very salt-sensitive. There was about 80% reduction in stand establishment in 10.5 dS m-1 salt (about 115 mM ) imposed for just one week. Maintaining rice seeds in saline conditions from seeding resulted in 50-70% initial seedling emergence. However, most seedlings then died within 14 days and by 42 days, only 5% or less survived. Though substantial differences existed between cultivars during germination and emergence, cultivar differences during post-emergence growth were minimal. Little improvement in stand establishment and seedling growth was achieved by ameliorating an initial exposure to salt by transferring to water after 21-35 days. The results demonstrated a gradual decrease in seedling mortality with later exposure to salt. There was little effect on stand establishment and other plant growth parameters when saline solution was introduced 35 days from seeding. Tolerance to a given salt concentration during germination and emergence of rice was not accompanied by the plants tolerance to that particular salt concentration at later stages of growth.

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