THE ROLES OF HETEROCHRONY AND HETEROBLASTY IN THE DIVERSIFICATION OF LEAF SHAPES IN BEGONIA-DREGEI (BEGONIACEAE)
THE ROLES OF HETEROCHRONY AND HETEROBLASTY IN THE DIVERSIFICATION OF LEAF SHAPES IN BEGONIA-DREGEI (BEGONIACEAE)
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DOI：
10.2307/2445599
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发表时间：
1993-07-01
影响因子：
3
通讯作者：
MCLELLAN, T
中科院分区：
文献类型：
--
作者：
MCLELLAN, T
使用几种形状分析的定量方法，在七种秋海棠幼苗中检查了过渡系列叶片和成年叶片形状变化之间的关系。 B. dregei 个体之间的成年叶形状以及个体内的幼年叶形状存在差异。随着个体的生长，叶子形状逐渐从对称、椭圆形、边缘光滑的叶子通过一系列十多个过渡叶子过渡到稳定的成年叶子形状。成人特征的获得似乎有两种基本模式。变体之间不同的性状在整个过渡系列中逐渐获得，而变体之间相似的性状则在大约第5叶时获得，并在后来的幼叶中保持稳定。一些品种较早的叶子和其他品种较晚的叶子之间没有相同的叶子形状。该物种成年叶形态的进化多样化与整个植物个体发育的简单变化无关。
The relationship between shape variation in the transitional series of leaves and in adult leaves was examined in seedlings of seven morphs of Begonia dregei using several quantitative methods of shape analysis. There is variation in the shape of adult leaves among individuals as well as in juvenile leaves within individuals in B. dregei. As an individual grows, there is a gradual transition in leaf shape from the symmetrical, oval, smooth-margined leaves through a series of more than ten transitional leaves to a stable adult leaf shape. There appear to be two basic patterns to the acquisition of adult traits. Traits that differ among morphs are acquired gradually throughout the entire transitional series while those that are similar among morphs are acquired by about leaf 5 and remain stable through the later juvenile leaves. There is no identity of leaf shape between the earlier leaves of some morphs and the later leaves of others. Evolutionary diversification in adult leaf morphology in this species is not related to simple changes in ontogeny of the whole plant.