Abstract
The main sterols of mature barley, wheat and wild oat straw were sitosterol, stigmasterol and campesterol at approximately 60, 18 and 15%, respectively. The sterols were distributed in the four sterol classes free sterols, steryl esters, steryl glucosides and acylated steryl glucosides at about 53, 25, 17 and 8%. The total sterol content for barley, wheat and wild oat straw was 668, 391 and 490 μg/g fr. wt, respectively. A species of Phytophthora causing serious root rot of carrots in Alberta, recently identified as P. porri, was induced to form oospores following long-term incubation with cereal straw sections. Therefore, under field conditions, where these cereal straws are abundant, they may serve as a natural source of sterols which are required for oospore production and thus be of significance in accounting for the survival of this fungus in the field.
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