4种李属彩叶植物色素含量与叶色参数的关系

以4种李属彩叶植物紫叶李、紫叶矮樱、黑杆樱李和美人梅4年生嫁接苗为试材,对其叶绿素、类胡萝卜素、花色素苷含量及叶色参数(L*、a*、b*)进行了测定分析。结果表明:(1)随着季节的变化,4种李属彩叶植物色素含量表现出基本相似的波动趋势,并以黑杆樱李的花色素苷含量在季节间较为稳定且极显著高于其他3种植物(P<0.01),而美人梅的叶绿素、类胡萝卜素含量在在季节间较为稳定且显著低于其余植物(P<0.05);4种植物中各色素含量比例不尽相同且随着季节而变化,但黑杆樱李的比值较稳定且花色素苷比例始终最高,叶片保持紫红色,而美人梅的各色素比值变化较大,叶片呈现紫红-绿-红的变化过程。(2)4种李属彩叶植物的叶色参数(L*、a*、b*)也随季节发生波动,并以黑杆樱李相对稳定,美人梅的变化幅度较大,而且各树种之间的a*和b*值差异分别达到显著水平(P<0.05)和极显著水平(P<0.01)。(3)4种植物叶片a*值与叶绿素含量、花色素苷含量均呈显著或极显著的正相关性,而L*值和b*值与叶绿素含量、花色素苷含量、类胡萝卜素含量的相关性因树种而异。研究发现,4种李属彩叶植物的色素含量及其比值随季节发生波动的幅度不尽相同,叶片花色素苷含量比例的高-低-高变化使叶色呈现红-绿-红的过渡;花色素苷含量和叶绿素含量的高低决定着a*值大小,但它们并不是影响L*和b*值的主要因素。

红檵木叶色变化的生理生化研究

In order to understand the physiological and biochemical reasons of leafcolor transformation in Loropetalum chinense var. rubrum,three types of L. chinense var. rubrum, Zihei (black purple), Zihong(red purple)and Hongzhe(red_ochre), and L. chinense were taken as materials. The contents of chlorophyll, carotenoid and soluble sugar, and activity of phenylalanine ammonialyase (PLA) in the leaves were measured from early March to June. The results showed that the contents of chlorophyll, carotenoid and soluble sugar increased gradually during the leafcolor changing from red to green, but there were obviously differences among types of Zihei, Zihong and Hongzhe. Anthocyanins contents in Zihe and Zihong leaves maintained high level, so their leaves still kept red when they got mature in early June. Phenylalanine ammonialyase (PLA) activity decreased, and had positive relationship with anthocyanin contents. Some measures such as shading or watering to lower air temperature could be taken to maintain leaves of L. chinense var. rubrum fresh red during summer.

外源蔗糖对红花槭叶色参数和色素含量的影响

以红花槭为试材,研究喷施不同浓度蔗糖溶液对其叶片叶色参数、花色素苷相对含量和叶绿素含量的影响。结果表明,在蔗糖溶液的作用下,叶色参数L先加速上升后加速下降,而参数a则上升显著。喷施蔗糖溶液对叶绿素含量影响不大,对花色素苷含量有显著提升。其中,以0.2mol·L-1蔗糖溶液处理效果最好。