Phloem development, growth markers, and sieve-tube longevity in two Neotropical trees

Autor(es)

Angyalossy, Veronica ^[1] ; Pace, Marcelo R. ^[2] ; Marcati, Carmen R. ^[3] ; Evert, Ray F. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Lab Anat Vegetal, Dept Bot, Rua Matao 277, Cidade Univ, BR-05508090 Sao Paulo, SP - Brazil

^[2] Univ Nacl Autonoma Mexico, Inst Biol, Dept Bot, Circuito Zona Deportiva S-N, Ciudad Univ, Mexico City 04510, DF - Mexico

^[3] Univ Estadual Paulista, Fac Ciencias Agronom, Dept Ciencia Florestal Solos & Ambiente, BR-18610307 Botucatu, SP - Brazil

^[4] Univ Wisconsin, Dept Bot, Birge Hall, 430 Lincoln Dr, Madison, WI 53706 - USA

• Tipo de documento: Artigo Científico
• Fonte: IAWA Journal; v. 42, n. 1, p. 31-49, FEB 2021.
• Citações Web of Science: 0

Resumo

This study provides a detailed analysis of phloem anatomy, development, the formation of cell types, differentiation, and sieve-tube element's longevity in two tropical arboreal species, Cedrela fissilis (Meliaceae, Rosid) and Citharexyhun myrianthum (Verbenaceae, Asterid), growing in natural populations in the semi-deciduous Atlantic Rainforest. We periodically collected samples from the main stem at breast height (1.3 m), during both the dry and the wet seasons. Differences in the cells produced at these different seasons suggest that annual growth increments in the phloem are present in both species, marked by files of terminal narrow sieve-tube elements radially grouped in Cedrela fissilis, and in assemblages of narrow sieve tubes and axial parenchyma in Cytharexylum myrianthum, both appearing at the end of the wet season. In Cedrela fissilis, where fiber bands are present, each fiber band marks the end of the early phloem, acting as an indirect annual growth ring marker. Sieve-tube element longevity varied for both species from 4-26 months, a result similar to that obtained in temperate species. (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: 18/06917-7 - LIANAS: abordagem integrativa sob a perspectiva anatômica
• Beneficiário: Veronica Angyalossy
• Modalidade de apoio: Auxílio à Pesquisa - Regular