Comprehensive Appraisal Of Salt Resistance And Threhold Of Lilium Species From Qin-ba Mountain Area

Under tissue cultural condition, this research evaluated salt tolerance of five Lilium species from Qin-ba Mountain Area through a certain(weight percent 0.8%) and a series of salt concentration. The salt tolerant gerplasm in the above five Lilium species were screened and their thresholds were indentified in comparison with Prato, a Lilium cultivars, providing quantitative basis for salt tolerance of wild lilies. The correlation between soil condition of Lilium species's original habitat and their salt tolerance was also dicussed. The results are as follows:1. Salt tolerance were of highly significant difference either among different Lilium species or among different ecotypes in the same species. Salt tolerant variation within in L.leucanthumBaker was relatively small and its salt resistance was comparatively high in whole. L.pumilumD and L.browniiF.E took the second place in tolerance to salinity, while L.duchartrei Franch. exhibited the weakest salt resistance. Results of cluster analysis separated 29 tested wild lilies into three groups, anti-salt group, middle anti-salt group and salt-sensitive group. Seven anti-salt ecotypes were screened out, which were L.leucanthumBaker LLZ-1, HPX-1, ZFS, L.pumilumD ZSW-1, L.browniiF.E NBX-1, THH-4 and L.lancifolium TZZH.2. The proliferation coefficient and the relative growth rate of Lilium were declined rapidly, while the salt-injury index ascending gradually. The differences of rising or decrease amplitude among wild lily materials were striking. Through establishing the regression equation models regarding the correlation between each index and salt concentration, the salt-tolerant thresholds of each index were figured out. The average threshold scopes of L.leucanthumBaker, L.pumilumD, L.browniiF.E.Franch. L.lancifolium were 0.53%-0.91%, 0.50%-1.00%, 0.59%-0.75%, 0.46%-0.87% respectively. The salt threshold of one L.duchartrei was identified by 0.59%.3. There were great discrepancies among the soil salt content and organic content in each ecotypes' original habitat. Results of correlation analysis between all indexes related to soil condition and salt resistance showed that, the relative growth rate has strong correlation with all soil condition indexes, which indicated that the soil salt content and soil fertility level have certain impact upon Lilium species' relative growth under salinity stress, nevertheless this influence was of unsignificance.