Functional trade-offs in volume allocation to xylem cell types in 75 species from the Brazilian savanna Cerrado

Autor(es)

Doria, Larissa Chacon ; Sonsin-Oliveira, Julia ; Rossi, Sergio ; Marcati, Carmen Regina

• Tipo de documento: Artigo Científico
• Fonte: ANNALS OF BOTANY; v. 130, n. 3, p. 12-pg., 2022-07-22.

Resumo

Background and Aims Xylem is a crucial tissue for plant survival, performing the functions of water transport, mechanical support and storage. Functional trade-offs are a result of the different assemblages of xylem cell types within a certain wood volume. We assessed how the volume allocated to different xylem cell types can be associated with wood functional trade-offs (hydraulics, mechanical and storage) in species from the Cerrado, the Brazilian savanna. We also assessed the xylem anatomical characters linked to wood density across species. Methods We analysed cross-sections of branches collected from 75 woody species belonging to 42 angiosperm families from the Cerrado. We estimated the wood volume fraction allocated to different cell types and performed measurements of vessel diameter and wood density. Key Results The largest volume of wood is allocated to fibres (0.47), followed by parenchyma (0.33) and vessels (0.20). Wood density is positively correlated to cell wall (fibre and vessel wall), and negatively to the fractions of fibre lumen and gelatinous fibres. We observed a trade-off between hydraulics (vessel diameter) and mechanics (cell wall fraction), and between mechanics and storage (parenchyma fraction). The expected positive functional relationships between hydraulics (vessel diameter) and water and carbohydrate storage (parenchyma and fibre lumen fractions) were not detected, though larger vessels are linked to a larger wood volume allocated to gelatinous fibres. Conclusions Woody species from the Cerrado show evidence of functional trade-offs between water transport, mechanical support and storage. Gelatinous fibres might be potentially linked to water storage and release by their positive relationship to increased vessel diameter, thus replacing the functional role of parenchyma and fibre lumen cells. Species can profit from the increased mechanical strength under tension provided by the presence of gelatinous fibres, avoiding expensive investments in high wood density. (AU)

• Processo FAPESP: 15/14954-1 - Atividade cambial e estrutura dos tecidos secundários em angiospermas
• Beneficiário: Carmen Regina Marcati
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 03/13578-9 - Estudos morfológicos, anatômicos, histoquímicos e ultraestruturais em plantas do Cerrado (Senso Lato) do estado de São Paulo
• Beneficiário: Júlia Sonsin Oliveira
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 12/50413-7 - Diversidade de madeiras do cerrado paulista
• Beneficiário: Carmen Regina Marcati
• Modalidade de apoio: Auxílio à Pesquisa - Publicações científicas - Livros no Brasil
• Processo FAPESP: 19/09417-8 - Efeito de condições ambientais (campo e controladas) na anatomia do lenho e casca em espécies tropicais
• Beneficiário: Carmen Regina Marcati
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/17778-9 - Sazonalidade cambial, tecidos vasculares e de proteção em espécies do cerrado paulista
• Beneficiário: Carmen Regina Marcati
• Modalidade de apoio: Auxílio à Pesquisa - Regular