Immunocytochemical evaluation of aquaporins and cell wall components and their influence on foliar water uptake in Andean Melastomataceae

Author:

Boanares D.123ORCID,Posada‐Herrera J. M.4,Bragança G. P. P.1,Arriola I. A.1ORCID,Caldeira C. F.3,da Costa L. E. N.3,Gastauer M.3,França M. G. C.1ORCID,Isaias R. M. d. S.1ORCID

Affiliation:

1. Departamento de Botânica Universidade Federal de Minas Gerais Belo Horizonte Minas Gerais Brazil

2. Department of Ecology State University of Estado do Rio de Janeiro (UERJ) Rio de Janeiro Brazil

3. Instituto Tecnológico Vale Belém Pará Brazil

4. Herbario Universidad de Caldas Universidad de Caldas (FAUC) Manizales Caldas Colombia

Abstract

Abstract Andean ecosystems are characterized by high humidity, mainly from rain and fog events. Because of differences in altitude two Andean ecosystems – sub‐Andean forest and Páramo –face different environmental pressures that affect leaf anatomy and cell wall composition and, consequently, species foliar water uptake (FWU) capacity. Here, FWU capacity of eight species in the Melastomataceae was evaluated and found to be related to proportions of cell wall components and aquaporins in the two ecosystems. Cellulose was labelled with Calcofluor white, and aquaporin and pectins were labelled with monoclonal antibodies. There were differences in plant FWU capacity in both ecosystems, with higher FWU capacity in sub‐Andean forest species than in Páramo forest species. Cell wall components were positively related to FWU, with increased FWU related to pectin and aquaporin content of the plasma membrane. Differences in water availability in the two analysed environments led to differences in FWU capacity that are associated with leaf anatomical traits and cell wall composition. In these two environments, plants with similar traits are selected to respond to given environmental pressures. Traits that favour FWU in sub‐Andean forest species may lead to further advances of these species in this environments.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Universidade Federal de Minas Gerais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Fundação de Amparo à Pesquisa do Estado de Minas Gerais

Publisher

Wiley

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