| Texto completo | |
| Autor(es): |
Cunha Neto, Israel L.
[1, 2, 3]
;
Pace, Marcelo R.
[4]
;
Hernandez-Gutierrez, Rebeca
[4]
;
Angyalossy, Veronica
[3]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Cornell Univ, Sch Integrat Plant Sci, Ithaca, NY 14853 - USA
[2] Cornell Univ, LH Bailey Hortorium, Ithaca, NY 14853 - USA
[3] Univ Sao Paulo, Inst Biociencias, Dept Bot, Lab Anat Vegetal, Rua Matao 277, Sao Paulo, SP - Brazil
[4] Univ Nacl Autonoma Mexico, Inst Biol, Dept Bot, Ciudad Univ, Circuito Zona Deportiva S-N, Mexico City 04510, DF - Mexico
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | EVODEVO; v. 13, n. 1 JAN 29 2022. |
| Citações Web of Science: | 0 |
| Resumo | |
Background Alternative patterns of secondary growth in stems of Nyctaginaceae is present in all growth habits of the family and have been known for a long time. However, the interpretation of types of cambial variants have been controversial, given that different authors have given them different developmental interpretations. The different growth habits coupled with an enormous stem anatomical diversity offers the unique opportunity to investigate the evolution of complex developments, to address how these anatomies shifted within habits, and how the acquisition of novel cambial variants and habit transitions impacted the diversification of the family. Methods We integrated developmental data with a phylogenetic framework to investigate the diversity and evolution of stem anatomy in Nyctaginaceae using phylogenetic comparative methods, reconstructing ancestral states, and examining whether anatomical shifts correspond to species diversification rate shifts in the family. Results Two types of cambial variants, interxylary phloem and successive cambia, were recorded in Nyctaginaceae, which result from four different ontogenies. These ontogenetic trajectories depart from two distinct primary vascular structures (regular or polycyclic eustele) yet, they contain shared developmental stages which generate stem morphologies with deconstructed boundaries of morphological categories (continuum morphology). Unlike our a priori hypotheses, interxylary phloem is reconstructed as the ancestral character for the family, with three ontogenies characterized as successive cambia evolving in few taxa. Cambial variants are not contingent on habits, and their transitions are independent from species diversification. Conclusions Our findings suggest that multiple developmental mechanisms, such as heterochrony and heterotopy, generate the transitions between interxylary phloem and successive cambia. Intermediate between these two extremes are present in Nyctaginaceae, suggesting a continuum morphology across the family as a generator of anatomical diversity. (AU) | |
| Processo FAPESP: | 17/17107-3 - Diversidade e evolução do sistema vascular em Nyctaginaceae |
| Beneficiário: | Israel Lopes da Cunha Neto |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |