Título:	Biochemical and genomic analysis of sucrose metabolism during coffee (Coffea arabica) fruit development.
Autoria:	GEROMEL, C. FERREIRA, L. P. GUERREIRO, S. M. C. CAVALARI, A. A. POT, D. PEREIRA, L. F. P. LEROY, T. VIEIRA, L. G. E. MAZZAFERA, P. MARRACCINI, P.
Afiliação:	CLARA GEROMEL, UNIVERSIDADE ESTADUAL DE CAMPINAS; LÚCIA PIRES FERREIRA, INSTITUTO AGRONÔMICO DO PARANÁ; SANDRA MARIA CARMELO GUERREIRO, UNIVERSIDADE ESTADUAL DE CAMPINAS; ALINE ANDRÉIA CAVALARI, UNIVERSIDADE ESTADUAL DE CAMPINAS; DAVID POT, INSTITUTO AGRONÔMICO DO PARANÁ; LUIZ FILIPE PROTASIO PEREIRA, CNPCa; THIERRY LEROY, CENTRO DE COOPERAÇÃO INTERNACIONAL EM PESQUISA AGRONÔMICA PARA O DESENVOLVIMENTO; LUIZ GONZAGA ESTEVES VIEIRA, INSTITUTO AGRONÔMICO DO PARANÁ; PAULO MAZZAFERA, UNIVERSIDADE ESTADUAL DE CAMPINAS; PIERRE MARRACCINI, CENTRO DE COOPERAÇÃO INTERNACIONAL EM PESQUISA AGRONÔMICA PARA O DESENVOLVIMENTO.
Ano de publicação:	2006
Referência:	Journal of Experimental Botany, v. 57, n. 12, p. 3243-3258, 2006.
Conteúdo:	Sucrose metabolism and the role of sucrose synthase were investigated in the fruit tissues (pericarp, perisperm, and endosperm) of Coffea arabica during development. Acid invertase, sucrose phosphate synthase, and sucrose synthase activities were monitored and compared with the levels of sucrose and reducing sugars. Among these enzymes, sucrose synthase showed the highest activities during the last stage of endosperm and pericarp development and this activity paralleled closely the accumulation of sucrose in these tissues at this stage. Carbon partitioning in fruits was studied by pulse-chase experiments with C-14-sugars and revealed high rates of sucrose turnover in perisperm and endosperm tissues. Additional feeding experiments with (CO2)-C-14 showed that leaf photosynthesis contributed more to seed development than the pericarp in terms of photosynthate supply to the endosperm. Sugar analysis, feeding experiments, and histological studies indicated that the perisperm plays an important role in this downloading process. It was observed that the perisperm presents a transient accumulation of starch which is degraded as the seed develops. Two full-length cDNAs (CaSUS1 and CaSUS2) and the complete gene sequence of the latter were also isolated. They encode sucrose synthase isoforms that are phylogenetically distinct, indicating their involvement in different physiological functions during cherry development. Contrasting expression patterns were observed for CaSUS1 and CaSUS2 in perisperm, endosperm, and pericarp tissues: CaSUS1 mRNAs accumulated mainly during the early development of perisperm and endosperm, as well as during pericarp growing phases, whereas those of CaSUS2 paralleled sucrose synthase activity in the last weeks of pericarp and endosperm development. Taken together, these results indicate that sucrose synthase plays an important role in sugar metabolism during sucrose accumulation in the coffee fruit.
Thesagro:	Coffea Arábica
NAL Thesaurus:	Endosperm Gene expression Sucrose synthase
Digital Object Identifier:	https://www.doi.org/10.1093/jxb/erl084
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (SAPC)