2019年8月22日 星期四
不同遮光处理对平茬后厚朴萌蘖株部分形态及生理指标的影响
Effects of different shading treatments on some morphological and physiological indexes of sprout tillers of Magnolia officinalis after stumped
2017年 第26卷 第2期 页码[55-60]    下载全文[0.9MB]  
摘要

以自然光照(遮光率0.0%)为对照,对遮光率20.0%、52.5%和78.6%条件下平茬后厚朴(Magnolia officinalis Rehd. et Wils)萌蘖株的部分形态和生理指标进行比较。结果表明:随遮光率提高,3个遮光处理组萌蘖株的株高呈现逐渐增大的趋势,萌蘖株叶中的叶绿素a、叶绿素b、类胡萝卜素和总叶绿素含量也基本上呈现逐渐增大的趋势,但萌蘖株的地径却呈现逐渐减小的趋势。萌蘖株的冠幅,单桩的萌蘖株数、叶片总数和叶芽总数,叶长和叶宽,单叶的干质量和叶面积,叶中叶绿素a含量与叶绿素b含量的比值(Chla/Chlb)和可溶性糖含量均在遮光率52.5%条件下最大,但仅冠幅、单桩叶片总数、单叶面积和叶中可溶性糖含量显著大于对照,分别较对照增加156.21%、28.18%、129.02%和64.31%;并且,多数指标在遮光率20.0%条件下居中、在遮光率78.6%条件下最小。然而,萌蘖株的叶长宽比、比叶质量及叶的相对含水量和可溶性蛋白质含量则在遮光率52.5%条件下最小,但仅比叶质量显著小于对照,较对照减少37.43%;并且,多数指标在遮光率20.0%条件下居中、在遮光率78.6%条件下最大。研究结果显示:适当的遮光处理能够促进平茬后厚朴萌蘖株的生长,遮光率52.5%为最优的遮光处理条件。

Abstract

Taking natural lighting (shading rate of 0.0%) as the control, some morphological and physiological indexes of sprout tillers of Magnolia officinalis Rehd. et Wils after stumped were compared at shading rate of 20.0%, 52.5% and 78.6%. The results show that with increasing of shading rate, height of sprout tillers in three shading treatment groups shows a tendency to increase gradually, and in general, contents of chlorophyll a, chlorophyll b, carotenoid and total chlorophyll in leaves of sprout tillers also show a tendency to increase gradually, but ground diameter of sprout tillers shows a tendency to decrease gradually. Crown width of sprout tillers, number of sprout tillers and total numbers of leaves and leaf buds per stump, leaf length and leaf width, dry weight and area per leaf, ratio of chlorophyll a content to chlorophyll b content (Chla/Chlb) and content of soluble sugar in leaves are the largest at shading rate of 52.5%, but only crown width, total number of leaves per stump, area per leaf and content of soluble sugar in leaves are significantly larger than those of the control with an increment of 156.21%, 28.18%, 129.02% and 64.31% compared with the control, respectively; in addition, most of the indexes are moderate at shading rate of 20.0%, and are the smallest at shading rate of 78.6%. However, ratio of leaf length to leaf width, specific leaf weight, relative water content and soluble protein content in leaves of sprout tillers are the smallest at shading rate of 52.5%, but only specific leaf weight is significantly smaller than that of the control with a decrement of 37.43% compared with the control; in addition, most of the indexes are moderate at shading rate of 20.0%, and are the largest at shading rate of 78.6%. It is suggested that appropriate shading treatment can promote the growth of sprout tillers of M. officinalis after stumped, and shading rate of 52.5% is the optimum shading treatment condition.

关键词厚朴; 萌蘖株; 遮光; 生长指标; 叶形指标; 生理指标
Key wordsMagnolia officinalis Rehd. et Wils; sprout tiller; shading; growth index; leaf shape index; physiological index
作者汪丽娜, 杨志玲, 杨旭, 程小燕, 谭美, 李公荣
所在单位中国林业科学研究院亚热带林业研究所 浙江省林木育种技术研究重点实验室, 浙江 杭州 311400
点击量480
基金项目国家自然科学基金资助项目(31270585)