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Nuclei Acid and Protein Contents in the Leaves of Rice (Oryza sativa L.) as Affected by Sodium Chloride
Thesis Abstract:
A greenhouse experiment was conducted to determine the growth response of three rice varieties, IR8, PB76-TB188 and C4-63G, to salt stress. One-month-old rice plants were treated with sodium chloride at concentrations of 0, 0.1, 0.2 and 0.3%.
Results showed that the ribonucleic acid (RNA) and protein contents in the leaves of the three rice varieties decreased with age in all treatments, including the control. The reduction of these two compounds was identical in all three varieties and occurred immediately after salinization. On the other hand, the deoxyribonucleic acid (DNA) increased in plants grown at all levels of NaCl up to the second week after salt addition and then decreased. This reaction points to the possibility that the RNA and protein contents in the leaves are more sensitive to salinity then DNA.
The amounts of nucleic acids and protein (expressed per unit of weight) were significantly different among the three rice varieties. IR8 had the highest, PB76-TB188 medium and C4-63G the lowest content of these organic compounds.
Assessment of the effect of salinity on plant growth in terms of height and dry weight of shoots and roots indicated that 0.2, 0.1 and range of 0.1 to 0.2% NaCl concentrations seemed optimum for IR8, C4-63G and PB76-TB188, respectively. This finding supports the previous observation that, comparatively, IT8 is tolerant, PB76-TB188 moderately tolerant and C4-63G sensitive to NaCL.
Root growth was less suppressed than that of the shoot, particularly at high NaCl level (0.3%), possibly because of the higher degree of root tolerance to salt.