Tolerance and Physiological Response of Distylium buxifolium and Its Cultivars to Salt Stress

We irrigated Distylium buxifolium with different concentrations of NaCl solution(0,80,100,200,300mmol·L-1),to evaluate salt-tolerance by indexes such as rate of injured area,relative water content,relative conductivity,chlorophyll content,malonicaldehyde(MDA)content,superoxide dismutase(SOD)activity,catalase(CAT)activity.Furthermore,the responses to moderate salt stress(100mmol·L-1 NaCl)of D.buxifolium(D)and its cultivars(D1,D4,D6,D7,D10,D13)were also compared.The results showed that:(1)The morphological and physiological indexes of D.buxifoliumchanged significantly under different salt concentrations.After 15 days,only those irrigated with NaCl solution below 100mmol·L-1 were still alive.(2)Under moderate salt stress(100mmol·L-1 NaCl),the rate of injured area of D1 and D13is significantly smaller than that of other cultivars and the difference in all these indexes of D.buxifoliumand its cultivars is significant.Meanwhile,the physiological response of D1 and D13showedthat the salt tolerance of these two cultivars might be higher than that of others.(3)The method of fuzzy cluster was used to evaluate the salt tolerance among different cultivars,which showed that the salt-tolerance order was D1D13DD7D10D4D6.Therefore,it is not appropriate to plant D.buxifolium in the area where salt concentration is above 100mmol·L-1.In light and moderate salinized areas,D1 and D13would be the priority selections.

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