Alternative modes of leaf dissection in monocotyledons
Alternative modes of leaf dissection in monocotyledons
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DOI：
10.1111/j.1095-8339.2006.00487.x
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发表时间：
2006-01-01
影响因子：
2.4
通讯作者：
Dengler, NG
中科院分区：
文献类型：
--
作者：
Gunawardena, AHLAN;Dengler, NG
尽管大多数单子叶植物都有单叶，但在四个目（Alismatales、Pandanales、Dioscoreales和Arecales）中发现了羽状或掌状解剖的叶片。叶解剖的独立进化起源表明系统发育分析，并反映在叶发育过程中采用的机制的多样性。在天南星科和菊科植物中，胚囊区分离的机制是通过对叶原基游离缘生长的局部促进和抑制。相比之下，棕榈（槟榔科）的波纹状的解剖叶通过两步过程发育：首先，褶皱通过在近边缘位置的插入生长形成，第二，最初的简单叶片通过小叶分离的类似横切的过程被解剖。第三种机制，穿孔形成，是受雇于龟背竹和五个相关属的天南星科。在这种模式下，离散的细胞片在叶片发育过程中经历程序性细胞死亡，导致形成开放的穿孔。当穿孔位于叶缘附近时，边缘组织的薄桥的机械破坏导致深羽状全裂的叶片。而胚囊分馏定义叶发育的早期初级形态发生阶段，其他两种模式发生后，在次级形态发生/组织发生阶段。这些机制的演变大概已经涉及招聘其他发展计划到解剖叶的发展。(c)2006伦敦林奈学会，林奈学会植物学杂志，2006，150，25-44。
Although a majority of monocotyledons have simple leaves, pinnately or palmately dissected blades are found in four orders, the Alismatales, Pandanales, Dioscoreales and Arecales. Independent evolutionary origins of leaf dissection are indicated by phylogenetic analyses and are reflected in the diversity of mechanisms employed during leaf development. The mechanism of blastozone fractionation through localized enhancement and suppression of growth of the free margin of the leaf primordium occurs in the Araceae and Dioscoreaceae. By contrast, the corrugated, dissected leaves of palms ( Arecaceae) develop through a two- step process: first, plications are formed through intercalary growth in a submarginal position and, second, the initially simple leaf blade is dissected through an abscission-like process of leaflet separation. A third mechanism, perforation formation, is employed in Monstera and five related genera of the Araceae. In this mode, discrete patches of cells undergo programmed cell death during lamina development, resulting in formation of open perforations. When perforations are positioned near the leaf margin, mechanical disruption of the thin bridges of marginal tissue results in a deeply pinnatisect blade. Whereas blastozone fractionation defines the early primary morphogenesis phase of leaf development, the other two modes occur later, during the secondary morphogenesis/ histogenesis phase. Evolution of these mechanisms presumably has involved recruitment of other developmental programmes into the development of dissected leaves. (c) 2006 The Linnean Society of London, Botanical Journal of the Linnean Society, 2006, 150, 25-44.