黄花藤形态变异花生物学简论

E. Nesy, L. Mathew
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引用次数: 0

摘要

麻花莲是夹竹桃科的一种观赏药用植物,花的颜色不同,有黄色、橙色和白色,被认为是其原始亲本类型的形态复制品。本文对这三种形态变异的花生物学进行了简明的形态解剖学研究,重点研究了花的各个部分的生物特征、花冠筒和花冠的结构、花药柱头复合体和胚珠到胚胎形成的附著,并利用手和显微切片分析了这些标本之间的异同。在光镜下,花冠筒上有具附属物和光滑壁的毛,花粉粒在柱头侧凹处萌发,花药裂片在10裂片不完全融合的柱头上的压迫,三孔花粉粒,胚珠发育阶段,花粉管进入胚珠,珠柄附着在胎座上等都是一些迷人的有价值的科学观察。各种花部的总体大小的大体形态变化被认为是可以忽略不计的,这可能是由于环境因素造成的。花形态本身不足以在分类等级中给出不同的品种地位,但花冠阴影对表型分化至关重要,多学科方法将有助于揭示未开发的性状,对亚种水平以下的研究有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A concise study on the floral biology of Thevetia peruviana morphovariants
Thevetia peruviana, an ornamental medicinal plant of the family Apocynaceae blooms in different colour shades of yellow, orange and white, and is considered morphological replicas of its original parental type. A concise morpho-anatomical study has been carried out on the floral biology of these three morphovariants emphasizing biometrics of various floral parts, the architecture of corolla tube and corolline corona, adnation of anther stigmatic head complex and ovule to embryo formation, using the hand as well as microtome sections, to analyze the similarities and differences among these specimens. Appendiculate and smooth walled hairs in corolla tube, germination of pollen grains in a lateral stigmatic notch, appression of anther lobes on 10-lobed incompletely fused stigma, triaperturate pollen grains, ovule developmental stages, entry of pollen tube into ovule, attachment of funicle on placenta etc are some of the enchanting valuable scientific observations under light microscopy. Gross morphological variations noted in the overall size of various floral parts are regarded as negligible ones, which may happen due to environmental factors. Floral morphology alone is insufficient to give distinct varietal status in the hierarchy of classification, but corolla shades, of course, are of prime importance for phenotypic differentiation, and a multidisciplinary approach will help to expose untapped characters, useful for future studies below the rank at the subspecies level.
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