Adaptations to foliar absorption of faeces: a pathway in plant carnivory
Adaptations to foliar absorption of faeces: a pathway in plant carnivory
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DOI：
10.1093/aob/mci082
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发表时间：
2005-04-01
期刊：
影响因子：
4.2
通讯作者：
Anderson, B
中科院分区：
文献类型：
--
作者：
Anderson, B
中心点背景和目的捕虫植物捕捉昆虫，但没有消化酶。据推测，捕虫草属植物的叶子从专性共生的食肉半翅目昆虫的粪便中吸收氮。但是，大多数植物叶片表面的快速移动是由一层不可渗透的角质层阻止的。然而，在食肉植物中，消化/吸收细胞中的表皮间隙或孔允许在叶表面上快速移动。近年来，半翅目昆虫与植物的相互作用被认为是植物捕食的一条新途径。在这里，通过证明捕虫植物如何可能通过它们的叶子快速吸收半翅目粪便来描述对该途径的进一步适应cuticles.center。方法使用染料中性红来记录叶子吸收的快速性，并使用TEM来确定捕虫植物叶子中角质层不连续性的性质Roridula.center。非食肉植物的叶子。此外，未成熟的捕虫草叶片不能吸收中性红，而成熟的叶片可以。透射电镜观察发现，捕虫草成熟叶表皮细胞中存在类似于其它肉食性植物的角质层间隙和气孔。结论捕虫草叶片角质层很薄（0-120 nm），细胞壁突出于叶表面，可能增强了叶片的吸收。leaves.center除此之外，角质层间隙也经常被发现，并且可能执行类似于在其他食肉植物中发现的功能：即吸收含水化合物。捕鸟蛛的表皮间隙可能是对植物食肉性的一种适应，支持新描述的途径。
center dot Background and Aims Roridula plants capture insects but have no digestive enzymes. It has been hypothesized that Roridula leaves absorb nitrogen from the faeces of obligately associated, carnivorous hemipterans. But rapid movement across the leaf surfaces of most plant leaves is prevented by the presence of an impermeable cuticle. However, in carnivorous plants, Cuticular gaps or pores in digestive/absorptive cells allow rapid movement across the leaf surface. Recently, it was suggested that the hemipteran-plant interaction constituted a new pathway for plant carnivory. Here, a further adaptation to this pathway is described by demonstrating how Roridula plants probably absorb hemipteran faeces rapidly through their leaf cuticles.center dot Methods The dye neutral red was used to document the rapidity of foliar absorption and TEM to determine the nature of cuticular discontinuities in the leaf of Roridula.center dot Key Results Aqueous compounds diffuse rapidly across the cuticle of Roridula's leaves but not across the cuticles of co-occurring, non-carnivorous plant leaves. Furthermore, immature Roridula leaves were unable to absorb neutral red whereas mature leaves could. Using TEM, cuticular gaps and pores similar to those in other carnivorous plants were found in the epidermal cells of mature Roridula leaves.center dot Conclusions The leaf cuticle of Roridula is very thin (0-120 nm) and cell wall elements project close to the leaf surface, possibly enhancing foliar absorption. In addition to these, cuticular gaps were frequently seen and probably perfom a function similar to those found in other carnivorous plants: namely the absorption of aqueous compounds. The Cuticular gaps of Roridula are probably an adaptation to plant carnivory, supporting the newly described pathway.