Morpho-Anatomical Analysis of the Rhizome in Species of Scleria Berg. (Cyperaceae) from Serra do Cipó (MG)

Brazilian Archives of Biology and Technology

Vera Fatima Gomes Alves Pereira Lima¹  Nanuza Luiza De Menezes¹ 

[1] ,Universidade de São Paulo Instituto de Biociências Departamento de BotânicaSão Paulo SP ,Brasil

关键词: meristematic endodermis;    rhizome;    Cyperaceae;   

DOI  :  10.1590/S1516-89132009000600019

来源: SciELO

【 摘 要 】

Aspects related to the nature of stem thickening in monocotyledons have been the subject of many studies. Primary thickening has been attributed to the Primary Thickening Meristem (PTM). According to most authors, it gives rise, besides the adventitious roots, to the vascular tissues and part of the cortex. In other words, it has centripetal and centrifugal activity. For some authors, however, it gives rise only to the vascular system, and for others, only to part of the cortex. However, this work demonstrated that PTM corresponds to the pericycle in the meristematic phase or to the pericycle associated with the endodermis, also with meristematic activity. It was observed that the pericycle was responsible for the formation of the vascular system of the rhizome and of the adventitious roots; the endodermis gave rise to cell layers with radial disposition which comprised the inner portion of the stem cortex, and which corresponded to the region known as the derivatives of the meristematic endodermis (DME). A continuity was also demonstrated between the tissues of the stem and root in species of Scleria Berg. (Cyperaceae).

【 授权许可】

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