Comparative Analysis of Salt Tolerance Between Ilex×'Huangjinjia'and Ilex×'Nellie R.Stevens'
The cuttings of Ilex× 'Nellie R.Stevens'and its budding variety Ilex× 'Huangjinjia'were used as test materials,a two-factor and five-level randomized block experiment was designed,the differences in salt tolerance and growth characters between the two kinds of Ilex were studied,in order to provide reference for the popularization and application of new varieties of Ilex.The results showed that both varieties of Ilex showed strong salt tolerance in morphological observation.With the increase of NaCl concentration and stress time,the net photosynthetic rate (Pn),transpiration rate (Tr)and stomatal conductance (Gs)decreased significantly,while the intercellular CO2 concentration (Ci) decreased at first and then increased.Superoxide dismutase (SOD)activity and peroxidase (POD) activity increased at first and then decreased,while malondialdehyde (MDA ) content increased continuously.In summary,the two kinds of Ilex could maintain their growth by regulating the activities of osmotic regulators and antioxidant enzymes under different concentrations of NaCl stress, indicated that they had strong salt tolerance,and Ilex ×'Huangjinjia'also had the ornamental advantage of golden leaves,which provided resources for the development planning of colored leaf tree species.
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