Abstract:

Four-year-old potting seedlings of Prunus cerasifera var. atropurea were used to study the color parameters of leaves,variation of pigments,the content of soluble sugar and the activity of PAL under NaCl stress. The soil salt contents were 0.042(CK), 0.1%, 0.2%, 0.3% and 0.4% respectively. The results were as follows: with increasing prolonged of NaCl stress time,lightness L^* -value and hue angle h increased,chroma C ^* and chromatic component a^* -value decreased. Chromatic component b^* -value and the content of soluble sugar increased in the first 15 days and then decreased with time and soil NaCl concentration. The activity of PAL increased in the first 5 days of treatments and then decreased with 10th days after that it rose again. With extension of treatment time the L^* -value increased and pigment contents decreased,which indicated that: The lower the content of pigments,the higher the lightness. P. cerasifera var. atropurea changed the content of pigments and ratio of pigments by regulating,hence the soluble sugar and the activity of PAL, then the colors of leaves would turned to kelly. The NaCl treatments reduced the ornamental value of P. cerasifera var. atropurea .

Key words: NaCl stress, P. cerasifera var. atropurea, leaf coloration, soluble sugar, PAL