Abstract:

In order to research the difference and the size of drought resistence of four Limonium L., and choose Limonium L. of higher drought resistance for arid desert area. The seed germination rates, seedling fresh weights and vigor indexes and the germination recovery percentage of seeds that were incubated in PEG-6000 solutions for 7 days recovered after being transferred to distilled water of four species, Limonium bicolor, Limonium gmelinii, Limonium otolepis and Limonium aureum, were studied under droughty circumstances of different concentrations of PEG-6000. The reselt indicated that the germination rate, germination potential and germination index increased along with the reducing of PEG-6000 concentrations, which had inhibitory effect on the germination of seeds. The germination of seed can restore under PEG-6000 solution treatment. Drought resistance index of Limonium aureum was maximum, Limonium bicolor, Limonium gmelinii, Limonium otolepis being the second, the third, the fourth. The comprehensive evaluation of the seed germination rates, seedling fresh weights and vigor indexes of four species indicated that the drought resistances of the four species decreased in the order of Limonium aureum>Limonium bicolor>Limonium gmelinii>Limonium otolepis.