Morpho-anatomical variations during stem development in some epiphytic Cactaceae

Autor(es)

Cassimiro de Lemos, Renata Cristina ^[1] ; Melo-de-Pinna, Gladys Flavia de A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biociencias, Dept Bot, BR-05422970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE TORREY BOTANICAL SOCIETY; v. 138, n. 1, p. 16-25, JAN-MAR 2011.
• Citações Web of Science: 0

Resumo

LEMOS, R. C. C. AND G. F. A. MELO-DE-PINNA (Departamento de Botanica, Instituto de Biociencias, Universidade de Sao Paulo, Rua do Matao 277, Travessa 14, Cidade Universitaria, Butanta, Caixa Postal 11461, 05422-970, Sao Paulo, SP, Brasil). Morpho-anatomical variations during stem development in some epiphytic Cactaceae. J. Torrey Bot. Soc. 138: 16-25. 2011. In this study, the morpho-anatomical features of Hatiora salicornioides (Harworth) Britton \& Rose, Rhipsalis floccosa Salm-Dyck Pfeiffer, Rhipsalis elliptica G. Lindb. ex K. Schum. and Epiphyllum phyllanthus (L.) Haworth. were studied during different phases of stem development. Primary (more developed) and terminal (less developed) segments showed variations of anatomical features as exhibited by the epidermal cells in surface view and transverse section. Features of the vascular system, e.g., the occurrence of non-lignified parenchyma in bands (H. salicornioides) or in small groups (R. floccosa and R. elliptica), as well as pericycle fibers and lignified cells in the medullar region, were only observed on the primary segments. Nevertheless, based on our anatomical analysis of stem segments in different developmental phases, we conclude that some characters described and used in systematic interpretations should be revised, mainly in the vascular (secondary xylem; non-xylematic vascular fibers) and dermal systems (epidermis in surface view and transverse section). (AU)

• Processo FAPESP: 05/56295-2 - Anatomia dos orgaos vegetativos de tres especies epifitas de cactaceae da serra do cipo.
• Beneficiário: Renata Cristina Cassimiro de Lemos
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica