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SCANNING ELECTRON MICROSCOPY OF THE UREDINIAL STAGE OF PUCCINIA CANALICULATA ON YELLOW NUTSEDGE, CYPERUS ESCULENTUS (CYPERACEAE)
Author(s) -
Wetzstein Hazel Y.,
Phatak Sharad C.
Publication year - 1987
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1987.tb08583.x
Subject(s) - biology , urediniospore , botany , cyperus , weed , germination
The ultrastructure of the uredinial stage of the rust fungus, Puccinia canaliculata (Schw.) Lagerh., on yellow nutsedge (Cyperus esculentus L.) is described using scanning electron microscopy. This rust has been proposed as a potential biological control agent against this serious weed species. Urediniospores are ellipsoid to ovoid, and echinulate with the spines distributed over the surface except at basal portions. Spines are in circular depressions, encircled by annuli. Germination is through one of two equatorial germ pores. Germ tube growth is primarily perpendicular to the longitudinal orientation of epidermal cells. Appressoria completely cover stomata. Uredinia develop within linearly aligned intercellular cavities in substomatal regions. Uredinia become erumpent, exposing pedicellate urediniospores and smooth paraphyses scattered throughout the sori. Uredinia are nonperidiate.