Floral Longevity of Paphiopedilum and Cypripedium Is Associated With Floral Morphology.
Floral Longevity of Paphiopedilum and Cypripedium Is Associated With Floral Morphology.
复制标题
兜兰和杓兰的花寿命与花形态相关。
DOI：
10.3389/fpls.2021.637236
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发表时间：
2021
影响因子：
5.6
通讯作者：
Zhang SB
中科院分区：
文献类型：
--
作者：
Zhang FP;Feng JQ;Huang JL;Huang W;Fu XW;Hu H;Zhang SB
花寿命(FL)是影响昆虫授粉机会从而影响植物繁殖成功的重要性状。然而，目前还不清楚哪些因素会影响FL，以及FL是否在进化上与结构特征有关。由于建筑成本和蒸腾作用造成的水分损失对叶片寿命有影响，我们推测花的结构可能会影响花中水分的维持和损失，从而影响FL。在这里，我们研究了拖鞋兰属Paphiopedilum和塞浦路斯，这两种植物关系密切，但在FL上存在很大差异。为了了解花解剖性状与FL的进化关系，我们采用独立于系统发育的比较方法，对兜兰属和塞浦路斯属18种植物的30个花解剖性状与FL的关系进行了研究。与兜兰属植物相比，凤仙花属植物的耐旱性和保水能力相关的花部性状的值较低。长FL基本伴随着花茎的表皮和内胚层组织较厚，花的近、背面表皮较厚，花脉密度和气孔密度较低。背唇片和合生片的脉密度与气孔密度呈负相关。我们的结果支持这一假说，即花瓣与拖鞋兰花解剖性状之间存在相关性。花的保水能力与花期有关。这些发现为自然选择下兰花性状与蒸腾失水的进化关联提供了新的见解。
Floral longevity (FL) is an important trait influencing plant reproductive success by affecting the chance of insect pollination. However, it is still unclear which factors affect FL, and whether FL is evolutionarily associated with structural traits. Since construction costs and water loss by transpiration play a role in leaf longevity, we speculated that floral structures may affect the maintenance and loss of water in flowers and, therefore, FL. Here, we investigated the slipper orchid Paphiopedilum and Cypripedium, which are closely related, but strongly differ in their FL. To understand the evolutionary association of floral anatomical traits with FL, we used a phylogenetic independent comparative method to examine the relationships between 30 floral anatomical traits and FL in 18 species of Paphiopedilum and Cypripedium. Compared with Paphiopedilum species, Cypripedium species have lower values for floral traits related to drought tolerance and water retention capacity. Long FL was basically accompanied by the thicker epidermal and endodermal tissues of the floral stem, the thicker adaxial and abaxial epidermis of the flower, and low floral vein and stomatal densities. Vein density of the dorsal sepals and synsepals was negatively correlated with stomatal density. Our results supported the hypothesis that there was a correlation between FL and floral anatomical traits in slipper orchids. The ability to retain water in the flowers was associated with FL. These findings provide a new insight into the evolutionary association of floral traits with transpirational water loss for orchids under natural selection.
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影响因子：
2.3
作者：
Arathi, HS;Rasch, A;Kelly, JK
通讯作者：
Kelly, JK
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作者：
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