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Brazilian Journal of Botany

Print version ISSN 0100-8404On-line version ISSN 1806-9959


RODRIGUES, ANA C.  and  ESTELITA, MARIA EMÍLIA M.. Primary and secondary development of Cyperus giganteus Vahl rhizome (Cyperaceae)Primary and secondary development of Cyperus giganteus Vahl rhizome (Cyperaceae). Rev. bras. Bot. [online]. 2002, vol.25, n.3, pp.251-258. ISSN 1806-9959.

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.

Keywords : Cyperus giganteus; Cyperaceae; rhizome development; secondary development.

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