报春花属植物花蜜的进化

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Mauricio J Cano, Louis Ronse De Craene
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引用次数: 0

摘要

报春花科sensus lato的报春花分支得到了很好的支持,并包含几种传粉综合征,包括风传粉和以花粉、花蜜或油作为奖励的昆虫传粉。以往的研究将蜜腺分为花状蜜腺和花外蜜腺两种类型,它们具有不同的分布(如子房、柱头、花柱、花梗)。本研究旨在重新评估蜜类型的多样性,以及它们在进化支内的分布和演化。选取的花分别代表了Maesoideae、Theophrastoideae、Primuloideae和myrsinideae四个亚科。用电子显微镜、光镜和糖试验研究了花的蜜腺组织。花蜜主要由雌蕊花蜜口分泌,分布在子房的基部、中部和顶部(在Maeseoideae、Theophrastoideae、Primuloideae和一些基部的桃科,如Stimpsonia和Coris)。蜜蜂科是一个例外,它没有与蜂群授粉有关的蜜腺,也没有在花被和雄蕊上呈现出产蜜或产油的毛状体。Primuloid枝中蜜腺的进化是可变的,Primuloideae显然是该枝中蜜腺进化逆转的起点,而Myrsinoideae中蜜腺的高度多样性代表了目前正在研究的各种趋势。报春花中花蜜的进化呈现出一个令人兴奋的转变,从产蜜的花到失去蜜腺,以及一个进化的逆转,即转向产油的毛状体或产蜜的毛状体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evolution of the floral nectaries in the Primulaceae sensus lato (Ericales)
Abstract The Primuloid clade or Primulaceae sensus lato is well supported and contains several pollination syndromes, including wind pollination and insect pollination with pollen, nectar, or oil as a reward. Previous studies have recognized two types of nectaries (floral and extrafloral) with different distributions (e.g. ovary, stigma, style, pedicel). This study aimed to reassess the diversity of nectary types, and their distribution and evolution within the clade. Flowers were selected to represent the four subfamilies Maesoideae, Theophrastoideae, Primuloideae, and Myrsinoideae. The flowers were investigated for nectary tissue with electron microscopy, light microscopy, and sugar tests. Nectar is mainly exuded by gynoecial nectarostomata (in Maeseoideae, Theophrastoideae, Primuloideae, and a few basal Myrsinoideae, such as Stimpsonia and Coris) distributed at the base, middle, and top part of the ovary. Myrsinoideae is the exception with an absence of a nectary linked to buzz-pollination, or presenting nectariferous or oil-producing trichomes on the perianth and stamens. The evolution of nectaries is variable in the Primuloid clade, with Primuloideae apparently the starting point of an evolutionary reversal in terms of nectary evolution within this clade, and a high diversity of nectaries within the Myrsinoideae representing various trends that are currently under-investigated. The evolution of floral nectaries in Primulaceae presents an exciting shift from nectar-producing flowers towards a loss of nectaries, and an evolutionary reversal with a shift to the co-option of either oil-producing trichomes or nectar-producing trichomes.
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来源期刊
CiteScore
5.70
自引率
8.30%
发文量
54
审稿时长
3.5 months
期刊介绍: The Botanical Journal of the Linnean Society publishes original papers on systematic and evolutionary botany and comparative studies of both living and fossil plants. Review papers are also welcomed which integrate fields such as cytology, morphogenesis, palynology and phytochemistry into a taxonomic framework. The Journal will only publish new taxa in exceptional circumstances or as part of larger monographic or phylogenetic revisions.
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