Abstract
To study the overlapping of gene expression between sporophyte and gametophyte phases, three annual species of the Medicago genus; M. truncatula, M. ciliaris and M. aculeata were used. First, we measured the germination rate of seeds and pollen grains as well as the length of young seedlings and the length of the pollen tubes under different levels of NaCl concentrations (0 mM, 68 mM, 102 mM and 136 mM). Afterwards, we measured the biochemical activity of plants based on electrophoresis of esterase enzymatic activity under salt stress treatments. The results showed that genotype M.acl4 of M. aculeate species is the most tolerant in the two stages, while the genotypes M.cil 1 and M.trur1 are the most sensitive of M. ciliaris and M. truncatula species, respectively. The separation of the esterase activities by electrophoresis revealed four bands with quantitative and qualitative changes in relation to stress in the same sensitive genotype M.cil1 of M. ciliaris species. The presence of a correlation between measured traits like vigor, as well as the connection between esterase profiles during periods of salt stress in both the sporophyte and gametophyte stages, may unveil a shared pattern of gene expression.
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