Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/16414
Tipo: Artigo
Título: Sugar metabolism and developmental stages of rubber tree (Hevea brasiliensis L.) seeds
Autor(es): Souza, Genaina Aparecida de
Dias, Denise Cunha Fernandes dos Santos
Pimenta, Thaline Martins
Almeida, Andrea Lanna
Picoli, Edgard Augusto de Toledo
Alvarenga, Antônio de Pádua
Silva, José Cleydson Ferreira da
Abstract: Changes in the concentration of sugars and sucrose metabolism enzymes can characterize the developmental stages of a seed. In recalcitrant species such as Hevea brasiliensis L., little is known about these changes. We aimed to evaluate the three main stages of development of rubber tree seeds – histodifferentiation, cell elongation and accumulation of reserves. The activities of acid and neutral invertases (E.C. 3.2.1.26) and sucrose synthase (EC 2.4.1.13), and the concentrations of reducing sugars (RS), total soluble sugars (TSS) and sucrose (Suc) were determined concomitantly with the histochemical and anatomical evaluation of seed structure. Histodifferentiation in rubber tree seeds occurs up to 75 days after anthesis (DAA). The concentration of RS is high and of Suc is low during seed histodifferentiation, which occurs along with a visible increase in the number of cell divisions. After that period, there is an increase in the concentration of Suc (mg g−1) and in the number and size of starch granules, and a decrease in the concentration of RS (mg g−1). At that point, cell elongation occurs. At 135 DAA, there is an inversion in the concentration of these two sugars and an increase in reserve accumulation. Thus, in seeds of the evaluated clone, the period up to 75 DAA is characterized as the histodifferentiation stage, while from that time up to 120 DAA the cell elongation stage takes place. The final stage of seed maturation and reserve accumulation begins at 135 DAA, and the seed, including the embryo, is completely formed at 175 DAA.
Palavras-chave: DAA, days after anthesis
DAP, days after pollination
RS, reducing sugars
Suc, sucrose
SuSy, sucrose synthase
TSS, total soluble sugars
Editor: Physiologia Plantarum
Tipo de Acesso: Open Access
URI: http://dx.doi.org/10.1111/ppl.12650
http://www.locus.ufv.br/handle/123456789/16414
Data do documento: 12-Dez-2017
Aparece nas coleções:Artigos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
artigo.pdftexto completo4,94 MBAdobe PDFThumbnail
Visualizar/Abrir


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.