Zinc deficiency in crop plants has been recognized as a worldwide nutritional constraint. A greenhouse experiment was conducted in order to evaluate the effects of Zn nutrition and salinity stress and their interaction on agronomical traits, chlorophyll and proline content of rice plant. Eight local and improved low land rice genotypes were grown at 0, 10 and 20 mg Zn kg-1 soil under saline (6 dS m-1) or non-saline condition at tillering stage. Results showed that interaction between Zn x salinity effects on filled grains, 100 grain weight and chlorophyll content were widely varied in rice plant genotypes. Only 100 grain weight was significantly differ at Zn x salinity x genotype interaction levels. Free proline content was significantly lower in Zn-efficient genotypes (Shafagh, Pokkali, IR9764 and IR9884) in comparison with Zn-inefficient genotypes (Hashemi, Domsiah, Kados and IR26). It seems that under salinity stress, the higher content of free proline could be considered as an injury indicator in rice plant. It could be concluded that Zn-efficient rice genotypes tolerated salinity better than the Zn-inefficient genotypes.
M. Jamalomidi, M. Esfahani and J. Carapetian, 2006. Zinc and Salinity Interaction on Agronomical Traits, Chlorophyll and Proline Content in Lowland Rice (Oryza sativa L.) Genotypes. Pakistan Journal of Biological Sciences, 9: 1315-1319.