Observations on the ultrastructure of the uredinial stage ofPuccinia polypogonis onPolypogon monspeliensis

Comparative morphology of uredinia and urediniospores of sixPucciniaspecies parasitic on Poaceae in Saudi Arabia

“…The spine morphology on the studied Puccinia species is in agreement with the descriptions for most other rust fungi (Littlefield and Heath, 1979) as being conical and sometimes curved at the tip, with the angle between the spines and the spore surface (Amerson and Van Dyke, 1978). Surface morphology and ornamentation features of rust urediniospores have been studied extensively with SEM (Stanbridge and Gay, 1969;Corlett, 1970;Amerson and Van Dyke, 1978;Brown and Brotzman, 1979;Littlefield and Heath, 1979;Harder, 1984;Gardner and Hodges, 1985;Woods and Beckett, 1987;Baka and Lo¨sel, 1992;Baka, 1992Baka, , 1996aBaka, , 1996bBaka, , 2003. The depressions and raised annuli around spines observed here are common in Puccinia and Uromyces species (Littlefield and Heath, 1979).…”

Ultrastructure of the dikaryotic stage of anise rust, Puccinia pimpinellae (F. Strauss) Link.

“…The haustorium of P. pimpinellae showed the ultrastructural characteristics described by other investigators for other club-shaped dikaryotic haustoria with two nuclei in their bodies (Baka, 1992;Baka and Gjaerum, 1996;Baka, 2002;Baka and Lösel, 1992a;Classen et al, 2001;Mims et al, 2002). It is generally assumed that, at maturity, two nuclei are present in the haustorium body.…”

“…The urediniospores of P. pimpinellae are pedicellate, with microechinulate walls resembling those found in other rust fungi such as Puccinia (Littlefield and Heath, 1979;Baka, 1992;Baka and Lösel, 1992a;Littlefield, 2000;Baka, 2004;Baka et al, 2004), Uromyces (Hwang et al, 2011), Coleosporium (Mims and Richardson, 2011), Ravenelia (Shivas et al, 2013). Urediniospores have been defined morphologically as always borne singly on pedicels that arise from successive new growing points on a sporogenous cell (Kunholtz-Lordat, 1943), although Heath and Bonde (1983) reported that in the case of the rust fungus, Physopella zeae several successive urediniospores were produced from the same site on a sporogenous cell.…”

“…Bar = 5.0 μm. that of most other rust fungi (Littlefield and Heath, 1979;Baka, 1992;Baka and Gjaerum, 1996;Baka and Lösel, 1992a). The extramural substances between intercellular hyphae and host cell wall may have adhesive function and related to the establishment of compatibility or incompatibility.…”

Puccinia romagnoliana Marie & Sacc. – a Potential Bioherbicide Agent for Biocontrol of Purple Nutsedge (Cyperus rotundus L.) in Mulberry

“…Uredinia were paraphysate, as reported in cases of other rusts on graminaceous plants (Purdy, 1985;Kulik and Dery, 1992). The pedicellate urediniospores resembled those found in most of the rust fungi, in which they were characterized by a microechinulate wall (Ehrlich and Ehrlich, 1969;Standbridge and Gay, 1969;Traquair and Kokko, 1983;Baka, 1992). However, differences in patterns of echinulae on spore wall, distribution of germpores and hilum structure were reported in different Puccinia species (Cummins, 1936;Hiratsuka and Sato, 1982;Traquair and Kokko, 1983).…”