JUDKEVICH marina daniela
Colleters in American Spermacoceae Genera (Rubiaceae), morphoanatomical and evolutionary aspects
JUDKEVICH, MARINA D.; SALAS ROBERTO M.; GONZALEZ ANA M.
INTERNATIONAL JOURNAL OF PLANT SCIENCES
UNIV CHICAGO PRESS
Lugar: Chicago; Año: 2017
Premise of research. The primary goal of this study is to describe the colleters on vegetative and reproductive organs in the Spermacoceae tribe and to characterize their morphoanatomy, distribution and some functional and evolutionary aspects.Methodology. The anatomy, development and vascularization of colleters from 28 species were studied using standard light and scanning electron microscopy based on fresh and fixed material. Our results are interpreted within the framework of recent molecular phylogenies.Pivotal results. Standard type colleters were found on stipules, calyx and bracteoles and they were also found on underground buds in five species of Galianthe. Six species have green colleters and two have vascularized colleters. We discuss previously unknown functional aspects based on the Staelia glandulosa colleters and propose a new term: long-lived colleters.Conclusions. This paper describes the anatomy of colleters in the Spermacoceae tribe of the family Rubiaceae in detail. The presence of underground colleters in Galianthe grandifolia is confirmed and extended to other species of the genus. Vascularization is recorded for the first time in colleters of Mitracarpus and Staelia. This study provides data about the type, distribution and anatomy of colleters in Spermacoceae, contributing important information for ongoing phylogenetic studies in the tribe. The proposal of a new functional type of colleter based on anatomical, morphological and ecological aspects, named long-lived colleter, reflects the need to perform further comprehensive studies based on multidisciplinary approaches.