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首页> 外文期刊>International journal of plant sciences >CUTICULAR PATTERNS ON STYLAR HAIRS IN ASTERACEAE: A NEW MICROMORPHOLOGICAL FEATURE
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CUTICULAR PATTERNS ON STYLAR HAIRS IN ASTERACEAE: A NEW MICROMORPHOLOGICAL FEATURE

机译：菊科花HAI中的模式：一种新的微观形态特征

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Premise of research. In the course of a detailed comparative study concerning style morphology (including 395 species of 258 genera covering all 44 tribes of the Asteraceae), we found a new microstructural feature, namely, often conspicuous cuticular patterns on the stylar hairs (involved in secondary pollen presentation) and stylar appendages. The observations raised questions as to whether the different striation patterns can be arranged in structural types and whether this new microcharacter could be of value in phylogenetic considerations. Methodology. Styles from liquid-preserved flowers or from herbarium material were studied by using scanning electron microscopy. Pivotal results. Five different patterns of cuticular striation can be discerned: crested pattern, triple pattern, double pattern, longitudinal pattern, and transverse pattern. By plotting the different cuticular patterns onto a generalized phylogenetic tree based on molecular data, it becomes obvious that there is considerable homoplasy in these features. Nevertheless, the cuticular patterns are still useful in characterizing some clades within the family. It is noteworthy that the small monogeneric subfamily Corymbioideae is characterized by a particular triple cuticular pattern on the stylar hairs that is otherwise found only rarely and isolated in some tribes (namely Mutisieae, Helenieae, Coreopsideae, and Heliantheae). The subfamily Mutisioideae is remarkable in the absence of simple patterns. A crested cuticular pattern is found only within the Mutisioideae (in Onoserideae and Mutisieae). Quite diverse in their cuticular patterns are the tribes Helenieae and Heliantheae within the Asteroideae. Conclusions. In comparison with the known influence of cuticular microstructures of petal cells on the wettability, we speculate that the cuticular striations of the stylar hairs increase the repellence of water drops in the flower, which would harm the viability of the pollen grains (due to osmosis, most pollen grains burst in pure water).
机译：研究前提。在有关样式形态的详细比较研究过程中（包括覆盖菊科所有44个部落的258个属的395种），我们发现了一种新的微观结构特征，即，在硬毛上通常具有明显的表皮模式（涉及次级花粉的表现） ）和样式附属物。这些观察提出了以下疑问：不同的条纹图案是否可以按结构类型排列，以及这种新的微字符是否在系统发育方面具有价值。方法。通过使用扫描电子显微镜研究了保存液体的花朵或植物标本室材料的样式。关键的结果。可以辨别出五种不同的表皮纹状体：冠状，三重，双重，纵向和横向。通过基于分子数据将不同的表皮模式绘制到广义的系统发育树上，很明显，这些特征中存在相当大的同质性。然而，表皮模式仍可用于表征家庭中的一些进化枝。值得注意的是，小型单属亚科（Corymbioideae）的特征是在硬毛上具有特殊的三倍表皮图案，否则在少数部落（即Mutisieae，Helenieae，Coreopsideae和Heliantheae）中很少发现。在没有简单模式的情况下，突变科亚科非常显着。仅在Mutisioideae内（在Onoserideae和Mutisieae中）发现有顶皮表皮图案。小行星中的Helenieae和Heliantheae部落的表皮形态十分多样。结论。与已知的花瓣细胞的表皮微结构对润湿性的影响相比，我们推测，直发毛的表皮条纹增加了花朵中水滴的排斥力，这会损害花粉粒的活力（由于渗透，大多数花粉粒在纯水中破裂）。

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