Variation of cuticle micromorphology of Metasequoia glyptostroboides (Taxodiaceae)
Variation of cuticle micromorphology of Metasequoia glyptostroboides (Taxodiaceae)
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DOI：
10.1006/bojl.2000.0429
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发表时间：
2001-06
影响因子：
2.4
通讯作者：
Q. Leng;Hong Yang;Qun Yang;Jianping Zhou
中科院分区：
文献类型：
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作者：
Q. Leng;Hong Yang;Qun Yang;Jianping Zhou
水杉（Metasequoia glyptostroboides Hu & W.）C.用扫描电子显微镜对中国中南部的Cheng自然种群和南京市的栽培树木进行了研究。生活在不同环境中的天然和栽培树木的角质层特征，使我们能够重新评估某些角质层特征的分类价值，并评估它们与环境因子和树木成熟度的关系。叶片近轴面（上）和远轴面（下）的外、内角质层特征表明：（1）M. Glyptostroboides在杉科中是独特的，但这种变异并没有超出这个科的范围。(2)除了一个孤立的树外的水杉山谷，角质层功能显示的个体树木从主要水杉格罗夫斯表现出高度的一致性，这是在一致的观察在总体形态水平上的低群体变异。(3)不同环境条件下水杉嫁接树的表皮特征与原木一致，说明水杉的表皮特征不能作为环境指标。(4)识别一些独特的表皮特征在水杉树在一个孤立的位置可能会导致一个罕见的来源，增加这种濒危物种的变异。
Leaf cuticle micromorphology of Metasequoia glyptostroboides Hu & W. C. Cheng was studied with SEM using samples collected from its natural population in south-central China and cultivated trees in Nanjing City. The cuticle characters from both natural and cultivated trees living in different environments allowed us to re-evaluate taxonomic values of certain cuticular characters and to assess their relationships with environmental factors and the degree of tree maturity. External and internal cuticular features of both adaxial (upper) and abaxial (lower) leaf surfaces revealed the following: (1) Cuticle micromorphology of M. glyptostroboides is distinct among Taxodiaceae, but that variation does not exceed the range of this family. (2) Except for an isolated tree outside the Metasequoia valley, the cuticular features displayed by individual trees from the main Metasequoia groves demonstrate a high degree of uniformity, which is in congruence with previous observations on the low population variability at the gross morphology level. (3) Cuticular characters of graftedMetasequoia trees living in different environments are identical to those of their original trees, indicating that no cuticular character of this species could be regarded as an environmental indicator. (4) Recognition of some unique cuticular features in a Metasequoia tree in an isolated location may lead to a rare source for increasing the variation of this endangered species.