Study of the Color Formation of Saraca dives New Leaves
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为探究中国无忧花叶片呈色的形态和生理变化,以中国无忧花 5 个不同发育阶段叶片为材料,测定并比较叶片成熟变色过程中叶色参数L*(明度)、a*(蓝度)、b*(红绿)值以及叶绿素a、叶绿素b、类胡萝卜素、花色素苷等色素含量的变化情况,研究叶色变化与叶色参数、色素含量的关系.结果表明:(1)随着中国无忧花叶片发育,叶色从深紫红色转为深绿色,叶色参数 L*值和 b*值先增加后下降,而 a*值先下降后上升;(2)叶片内叶绿素总量和叶绿素 b 含量整体呈现上升的趋势,花色素苷含量则逐渐下降,叶绿素 a 含量和类胡萝卜素含量波动较小;(3)相关性分析发现,叶色参数 a*值与花色素苷含量间存在极显著正相关,与叶绿素总量间存在极显著负相关,叶色参数 b*、L*值与花色素苷含量间存在显著负相关.用色差仪对中国无忧花叶色进行测定,可以较好地表征叶片发育阶段呈现出的颜色变化.中国无忧花叶片从深紫红色变为深绿色,主要是由于叶绿素 b 和叶绿素总量上升、花色素苷含量不断减小导致.中国无忧花新叶红色和下垂,可能具有防止紫外线等强光照射造成伤害的作用.
To explore the morphological and physiological changes in the color of Saraca dives,leaves from five different developmental stages were used as materials.The values of the leaf color parameters L*(brightness),a*(blue-yellow),and b*(red-green)values,as well as the contents of chlorophyll a,chlorophyll b,carotenoids,and anthocyanins during the maturation and coloration process of the leaves were determined and compared,and their correlations were analyzed.The results showed that:(1)As the leaves of Saraca dives developed,the leaf color changed from deep purple-red to deep green.The brightness(L*)and blue-yellow(b*)values initially increased and then decreased,while the red-green(a*)value initially decreased and then increased.(2)The content of total chlorophyll and chlorophyll b in the leaves tended to increase overall,whereas the content of anthocyanins gradually decreased.The variations in chlorophyll a and carotenoid contents were relatively small.(3)Correlation analysis revealed a highly significant positive correlation between the a* values of the leaf color parameters and the contents of anthocyanins,as well as a highly significant negative correlation with the total chlorophyll content.There was a significant negative correlation between the b* and L* values of the leaf color parameters and the content of anthocyanins.In conclusion,the use of a colorimeter to measure the leaf color of Saraca dives can be used to characterize color changes effec-tively during leaf development stages.The shift from deep purple-red to deep green in the leaves of Saraca dives is primarily due to the overall increase in chlorophyll b and total chlorophyll contents,coupled with a continuous decrease in the antho-cyanin content.
Saraca divesleaf colorleaf color parameterspigmentcorrelation
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NSTL
万方数据
