Abstract: The cytological development of leaves of salt-tolerance cultivar‘Prato’and combined salt-sensitive cultivar Sorbonne in Lilium, stressed with different concentration of salinity, was studied using transmission electron microscope. The results indicated that under the control and low NaCl concentration, leaves
of Prato were abundant with organelles, the lamellae were lined regularly, with the increase of salt concentration, the number of organelles decreased, the chlorop lasts degenerated. In contrast to Prato, leaves of Sorbonne showed abnormal behaviors under low NaCl concentration, including degenerated organelles, vacuolated chloroplasts and the loosened lamellae. In addition, mitochondria began to degenerate prior to chloroplasts. It is inferred that degeneration of chloroplasts contributed to the ultra structure of degeneration of mitochondria, which further leading to senescence of leaves.

Key words: Lilium ssp., Salt stress, Ultra structure