Primary and secondary development of Cyperus giganteus Vahl rhizome (Cyperaceae)
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چکیده
(Primary and secondary development of Cyperus giganteus Vahl rhizome (Cyperaceae)). In Cyperus giganteus, like in other Monocotyledoneae, the protoderm, procambium, fundamental meristem and primary thickening meristem (PTM) are differentiated from the rhizome promeristem. The PTM produces the inner cortical parenchyma, endodermis, pericycle and amphivasal vascular bundles, which are formed by the procambium too. After the primary body differentiates, cellular divisions continue only in the pericycle, and originate an irregular vascular system with vessel elements shorter and more branched than those found in the primary growth. This change of activity in the pericycle defines a secondary growth, where the secondary thickening meristem (STM) is the pericycle itself. RESUMO – (Desenvolvimento primário e secundário do rizoma de Cyperus giganteus Vahl (Cyperaceae)). Em Cyperus giganteus, como em outras monocotiledôneas, a partir do promeristema do rizoma diferenciam-se a protoderme, o procâmbio e o meristema fundamental e, ainda, o meristema de espessamento primário (MEP). Este último dá origem ao parênquima cortical interno, endoderme, periciclo e feixes vasculares anfivasais, os quais se formam também a partir do procâmbio. Após a diferenciação do corpo primário, apenas o periciclo permanece em divisão, formando um sistema vascular desalinhado, onde os elementos de vaso são mais curtos e mais ramificados do que aqueles do crescimento primário. Esta mudança de atividade do periciclo caracteriza o crescimento secundário, cujo meristema de espessamento (MES) é o próprio periciclo.
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