Active metabolism during desiccation of the desiccation tolerant short-lived seeds of Poincianella pluviosa (DC.) L. P. Queiroz

Autor(es)

João Paulo Naldi Silva ^[1] ; Maria Luiza Faria Salatino ^[2] ; Claudio José Barbedo ^[3] ; Rita de Cássia Leone Figueiredo-Ribeiro ^[4] ; Danilo da Cruz Centeno ^[5]

Afiliação do(s) autor(es)

^[1] Instituto de Pesquisas Ambientais - Brasil

^[2] Universidade de São Paulo - Brasil

^[3] Instituto de Pesquisas Ambientais - Brasil

^[4] Instituto de Pesquisas Ambientais - Brasil

^[5] Universidade Federal do ABC - Brasil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF SEED SCIENCE; v. 44, 2022-07-29.

Resumo

Abstract: During embryogenesis and seed filling, developing seeds are metabolically highly active, while at the desiccation stage of tolerant seeds a decreased metabolism is expected. Seeds of Poincianella pluviosa present an extensive maturation cycle (11 months), longer than seed storability at room temperature (8 months). The metabolic profile of these seeds was characterized during maturation and drying, focusing in their role on seed behavior after shedding. Distinct responses of the embryonic axes and cotyledons to drying were observed depending on the developmental stage. Low proportions of tricarboxylic acids intermediaries until maturity indicated a low respiratory metabolism prior to the desiccation stage. Changes in shikimate, 4-coumarate, and quinate proportions suggest a metabolic shift towards the synthesis of chlorogenate isomers, found in high proportions in dispersed seeds. High proportions of lactate and glycerol were observed in immature seeds after artificial drying, but also in naturally dried axes of dispersed seeds. This suggests an active metabolism prior to drying and an osmotic stress under hypoxia, mechanisms that were never described before in desiccation-tolerant seeds. The results indicated that P. pluviosa seeds are dispersed with an incomplete metabolic switch-off, which can be related to their short lifespan. (AU)

• Processo FAPESP: 12/23838-7 - Alteração no balanço de carbono em gramíneas visando incremento na produção de açúcares
• Beneficiário: Danilo da Cruz Centeno
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Jovens Pesquisadores