以盆栽4年生紫叶李为试材,设置土壤的NaCl含量为0.042%(CK),0.1%,0.2%,0.3%,0.4%,研究NaCl胁迫对紫叶李叶片中色泽参数 L*, a*, b*, C*, h ,呈色色素含量,可溶性糖含量和PAL酶活性的影响。结果表明: 随着处理时间的延长,紫叶李叶片明度 L* 值升高,色相 a* 值不断降低,色相 b* 值升高,彩度 C* 降低,色相角度 h 升高,花青苷、类黄酮、叶绿素、类胡萝卜素含量在处理的第5天升高,之后随处理时间延长不断降低,且NaCl胁迫程度越重降低得越明显; 可溶性糖含量在处理的前15天升高,15天后持续下降; PAL酶活性在处理的前5天升高,之后降低,第10天开始再次持续上升。随处理时间延长 L* 值不断升高,而色素含量不断降低,表明紫叶李叶片中色素含量越低,明度越高。NaCl胁迫后,紫叶李通过调节可溶性糖含量和PAL酶活性来改变呈色色素含量及色素之间的比例,进而影响其叶片的色泽,使叶色向黄绿方向转化,导致观赏价值降低。
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 .
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