CARBOHYDRATE COMPOSITION AND METABOLISM OF <i>SENECIO SQUALIDUS</i> L. LEAVES INFECTED WITH <i>ALBUGO TRAGOPOGONIS</i> (PERS.) S. F. GRAY

Abstract

S ummary The soluble and insoluble carbohydrates of healthy and Albugo‐infected leaves of Senecio squalidus were determined qualitatively. Quantitative analyses were made of the soluble carbohydrates. Trehalose was synthesized within pustules by the fungus but no acyclic polyols were found. Accumulation of hexoses around pustules together with increased hydrolysis of exogenous sucrose by pustular material indicated increased invertase activity within infected tissues. It is suggested that host‐fungus movement of carbohydrates in Albugo is maintained by hydrolysis of host sucrose and uptake of hexoses, followed by accumulation of trehalose within the mycelium and spores.