Diversity of non-structural carbohydrates in grasses (Poaceae) from Brazil

Autor(es)

Moraes, M. G. ^[1] ; Chatterton, N. J. ^[2] ; Harrison, P. A. ^[2] ; Filgueiras, T. S. ^[3] ; Figueiredo-Ribeiro, R. C. L. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Fed Goias, Inst Ciencias Biol, BR-74001970 Goiania, Go - Brazil

^[2] ARS, Forage & Range Res Lab, USDA, Logan, UT - USA

^[3] 3 Herbarium Maria Eneyda P Kauffman Fidalgo Inst, Sao Paulo - Brazil

^[4] Inst Bot, Nucleo Fisiol & Bioquim Plantas 4, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: GRASS AND FORAGE SCIENCE; v. 68, n. 1, p. 165-177, MAR 2013.
• Citações Web of Science: 11

Resumo

Non-structural carbohydrates (NSC) are the primary energy available for growth and dry-mass production in forage grasses. They are also associated with tolerance to environmental stresses, including drought. Soluble carbohydrates, especially fructans of temperate forage grasses, have been extensively studied; however, little is known about NSC of tropical grasses. These plants are abundant in the Cerrado, a savanna-like vegetation with a definite seasonality in rainfall distribution. Such an environment presents an ideal condition for the occurrence of fructans. However, the present analysis of carbohydrates in aerial parts of twenty-four tropical grass species, mainly from the Panicoideae subfamily in the Cerrado, shows a distinctively different NSC profile when compared with temperate grasses. Free glucose and starch are common NSC found in most plant organs. However, free fructose and sucrose-based oligosaccharides were only found in very low amounts. Sucrose was detected in higher amounts only in stems. A linear series of malto-oligosaccharides was found in leaf blades, sheaths and stems of most of the Cerrado grasses, except for those from the Andropogoneae tribe. These results indicate a diversity of regulatory pathways of NSC metabolism in tropical forage grasses from the Cerrado. (AU)

• Processo FAPESP: 00/06422-4 - Caesalpinia echinata (Pau-brasil) da semente à madeira, um modelo para estudos de plantas arbóreas tropicais brasileiras
• Beneficiário: Rita de Cassia Leone Figueiredo Ribeiro
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 05/04139-7 - Carboidratos de plantas tropicais como moduladores de processos ecofisiológicos e indicadores de respostas a estresses ambientais
• Beneficiário: Marcia Regina Braga
• Modalidade de apoio: Auxílio à Pesquisa - Temático