GONZALEZ Ana Maria
Colleters in American Spermacoceae Genera of Rubiaceae: morphoanatomical and evolutionary aspects
JUDKEVICH M.D; SALAS R.M.; A. M. GONZALEZ
INTERNATIONAL JOURNAL OF PLANT SCIENCES
UNIV CHICAGO PRESS
Lugar: Chicago; Año: 2017 vol. 178 p. 378 - 397
Premise of research. The primary goal of this study is to describe the colleters onvegetative and reproductive organs in the Spermacoceae tribe and to characterizetheir morphoanatomy, distribution and some functional and evolutionary aspects.Methodology. The anatomy, development and vascularization of colleters from 28species were studied using standard light and scanning electron microscopy based onfresh and fixed material. Our results are interpreted within the framework of recentmolecular 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 tribeof 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.