DIFFERENT WAYS TO BUILD SUCCULENT LEAVES IN PORTULACINEAE (CARYOPHYLLALES)

Autor(es)

Hernandes-Lopes, Jose ^[1] ; Oliveira-Neto, Mario A. ^[1] ; Melo-de-Pinna, Gladys F. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biociencias, Dept Bot, Rua Matao 277, BR-05508090 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF PLANT SCIENCES; v. 177, n. 2, p. 198-208, FEB 2016.
• Citações Web of Science: 3

Resumo

Species of the suborder Portulacineae (Caryophyllales) often possess succulent leaves with wide morphological diversity, including flat and terete leaves. Terete leaves are described as not developing a marginal meristem during their growth, but in Portulacineae little is known about anatomical development in this particular leaf type. To better understand the mechanisms underlying the development of different leaf morphologies within this group, we examined leaf histogenesis in species of four families with succulent leaves-Basellaceae, Didiereaceae, Portulacaceae, and Talinaceae-through optical microscopy. We observed two morphological patterns (terete and flat leaves) and three developmental patterns regarding blastozone positioning. While species with flat leaves always show the expected pattern of marginal blastozone activity, terete leaves of Didiereaceae present marginal blastozones for only a very brief period. On the other hand, terete leaves of Portulacaceae show a persistent peripheral blastozone enveloping the entire leaf during its development. We also demonstrate anatomical evidence suggesting that the terete leaves of Portulacaceae are adaxialized, i.e., their entire surface is homologous to the adaxial side, while terete leaves of Didiereaceae seem to result from a less severe modification. (AU)

• Processo FAPESP: 09/14708-0 - Estudos anatômicos e suas implicações nas relações filogenéticas de caryophyllales.
• Beneficiário: Gladys Flávia de Albuquerque Melo de Pinna
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/56011-2 - Estudo de homologias primarias entre portulacaceae e cactaceae baseado na histogenese da regiao da axila foliar em portulacaceae.
• Beneficiário: José Hernandes Lopes Filho
• Modalidade de apoio: Bolsas no Brasil - Mestrado