Production of pectinases and cellulase by six Pythium species isolated from necrotic strawberry roots
Polygalacturonase and polymethylgalacturonase activity was detected in filtrates ofPythium irregulare, P. perniciosum, P. sylvaticum, andP. dissotocum but not in filtrates ofP. rostratum andP. acanthicum. OnlyP. irregulare, P. perniciosum andP. dissotocum elaborated pectin methyl esterase and in trace amounts. None of the species produced detectable pectintrans-eliminase and “macerating enzyme” activity.P. sylvaticum was the only species of four tested which produced cellulase.
Histopathology of Pythium infected strawberry roots
Host–parasite interactions between eight Pythium species, previously isolated from necrotic strawberry root tissue, and Fragaria × ananassa Duch. runner plant main roots were studied. When excised ...
Action of Phytopathogenic Bacteria on Pectate Gel
MANY of the bacteria which cause diseases of plants attack their hosts, in the first instance, by breaking down the pectic substances of the middle lamella. This is particularly true of the soft-rot organisms and of those pathogens causing diseases of the parenchyma.