Variações diurnas no teor de carboidratos solúveis de haste e folhas de capim napier (Pennisetum purpureum, Schum)

Abstract

RESUMO Amostras de haste e folhas de capim Napier(Pennisetum purpureum, Schum) foram colhidas às 7, 10, 15 e 17 horas e analisadas quanto aos teores de carboidratos solúveis totais e açúcares redutores.Na haste, o teor de carboidratos solúveis totais foi mínimo às 17 horas e nas folhas não foram deterctadas diferenças significativas. O teor de açúcares redutores da haste foi máxima às 15 horas e nas folhas não foram detectadas diferenças significativas.A relação açúcares redutores/carboidratos totais, praticamente, não sofreu variações durante as colheitas, tanto para haste como para folhas.

Adaptive responses of millet (Pennisetum glaucum) and elephant grass (Pennisetum purpureum) at salinity

“…The reducing sugars are capable of reducing the oxidizing agents present in the plant, distinguishing it from other sugars as oligosaccharides and polysaccharides, which do not have this feature without suffering hydrolysis of connection glicosídica, are referred to as sugars non-reducing (Maldonade et al, 2013). Gutierrez et al (1976), studying the species of P. purpureum with the title variations of daylight in carbohydrate content soluble stem and leafs of grass, Napier, observed that the content of reducing sugars in the stem was maximum at 15 hours, and in the leaves were not detected significant differences. The ratio sugars/carbohydrate total, practically has not suffered variations during the harvest, both for rod as for the leaves, comparing with the present work we can observe differences, because unlike the cited work, there was a higher accumulation of soluble sugar than sugars (The), sheets interim (B) Hem (C) and roots (D) plants of millet (P. glaucum) and grass elephant (P. purpureum) grown in solutions nutritional of Hoagland and submitted to the treatments control (white bar) and stress-buffered saline with NaCl to 60 mM (bars in dark gray).…”