Effect of NaCl Stress on Physiological Characteristics of Two Manilkara Species Leaves
The physiological characteristics of Manilkara zapota(L.)van Royen and Manilkara roxburghiana(Wight)Dubard were studied by watering the potted plants with NaCl solution.The characteristics include chlorophyll,proline,soluble protein,SOD,POD,CAT and so on.The results showed that Manilkara zapota(L.)van Royen grew well below 1.98‰ NaCl stress condition,so did Manilkara roxburghiana(Wight)Dubard below 2.42‰ NaCl stress condition.Under NaCl stress,chlorophyll synthesis was significantly restricted;For Manilkara zapota(L.)van Royen,the activity of the SOD increased,however the activity of POD or CAT increased first and then dropped.The content of proline was higher significantly than that of the control,so did the content of soluble protein when the concentration of NaCl was between 4‰~8‰.For Manilkara roxburghiana(Wight)Dubard,the activity of CAT increased and that of SOD or POD decreased.The activities of the SOD,POD and CAT differed significantly from that of the control.The content of proline or soluble protein was higher than that of the control when the concentration of NaCl was between 4‰~8‰.The small organic molecules working as osmotic potentials in cells played a key role in salt tolerance for the two species.