Abstract Detail

Anatomy and Morphology

Nejapa Mendoza, Rosa Celia [1], Cabanillas, Pablo A. [2], Pace, Marcelo [3].

Ontogeny of the successive cambia in the stems of Wisteria (Leguminosae), a temperate genus of lianas.

Wisteria is a well-known, charismatic genus of lianas cultivated across the world. Originally, the genus is distributed in temperate zones of eastern Asia and eastern United States. In recent collections, we noted the presence of successive cambia in stems of W. sinensis, a feature not commonly reported in lianas from temperate zones. Previous authors have generated controversy around the origin of the cambial variant in the genus, with basically all possible ontogenies for their successive cambia being proposed. The aims of this work were to identify the origin and development of the successive cambia using W. sinensis as a model and to compare it with the stems of other available species of the genus. The results shows that the three species of Wisteria studied have successive cambia. Our ontogenetic study evidences that initially the stems have a regular secondary growth, and that the development of the cambial variant occurs outside the pericyclic fibers in the cortical parenchyma. The neo-cambia are bifacial. They begin their activity differentiating fibers alternating with non-lignified parenchyma towards both sides, before conducting elements of secondary xylem and phloem start to be formed. This process occurs simultaneously in different portions of the cortex and eventually these initially independent patches can merge, resulting in a continuous, concentric cambium or alternatively developing successive cambia increments only towards one single side of the stem.

1 - Universidad Nacional Autonoma de Mexico, Instituto de Biologia, Botanica, Circuito Zona Deportiva s.n. de Ciudad Universitaria, Mexico City, DF, 04510, Mexico
2 - Universidad Nacional de La Plata, Facultad de Ciencias Naturales y Mus, Cátedra de Morfología Vegetal, Paseo del bosque s/n, La Plata, 1900, Argentina
3 - Universidad Nacional Autonoma de Mexico Instituto de Biologia, Botanica, Circuito Zona Deportiva sn de Ciudad Universitaria, Mexico City, DF, 04510, Mexico

Keywords:
Wisteria
Lianas
successive cambia
wood anatomy.

Presentation Type: Oral Paper
Session: AM1, Anatomy and Morphology
Location: Virtual/Virtual
Date: Wednesday, July 29th, 2020
Time: 1:45 PM
Number: AM1015
Abstract ID:679
Candidate for Awards:Katherine Esau Award,Maynard F. Moseley Award