The species of uromyces on the tribe paniceae

Detection and phylogenetic relationships of Puccinia emaculata and Uromyces graminicola (Pucciniales) on switchgrass in New York State using rDNA sequence information

“…Uromyces graminicola has been reported to occur in at least 18 states, including the four states -Iowa, Nebraska, NY State, and South Dakota -from which it was identified on switchgrass in the present study (Table 1; Fig. 2; Ramachar and Cummins 1963;Farr and Rossman 2015). Collectively, the geographic distribution of U. graminicola in the continental U.S. appears to be nearly identical to that of P. emaculata extending from southern New England and states of the northern mid-west to New Mexico and Florida.…”

“…Moreover, given its range of telial hosts and large geographic distribution, studies into the winter survival of P. emaculata are also warranted. Ecological zones for winter survival may exist -similar to that described for rust fungi of cereals (Roelfs 1989 1945;Ramachar and Cummins 1963;Anonymous 1970;McCain et al 1990;Farr and Rossman 2015). As with P. emaculata, the geographic distribution of U. graminicola closely follows that of its telial hosts and, hence, is expansive.…”

“…3). Uromyces graminicola is the only one-celled teliospore-producing rust fungus known to infect switchgrass (Arthur 1934;Ramachar and Cummins 1963). Puccinia graminis and P.…”

“…As noted previously, no identical or near identical ITS sequence(s) exist in GenBank to compare with our Clade II taxa. However, based on morphological results, the ten taxa examined from Clade II were identified to U. graminicola (Arthur 1934;Ramachar and Cummins 1963;Cummins 1971): teliospores brown to chestnut-brown, one-celled, oblong to ovoid, and 21.0-34.5 x 12.8-23.3 µm; cell wall 1.7-4.8 µm thick at sides, 4.5-10.4 µm apically (Fig. 3B).…”

“…Moreover, rusts are unique fungi as a single species can produce up to five, functionally and morphologically different spore stages (macrocyclic O-IV; O = spermatium, I = aceciospore, II = urediniospore, III = teliospore, and IV = basidiospore) and require at least two taxonomically unrelated host plants to complete their life cycle (heteroecious; Cummins and Hiratsuka 2003). Historically, the taxonomic classification of rust fungi in large part has been based on morphologic discontinuities among telia and teliospores, and to a lesser extent, urediniospores (Arthur 1934, Ramachar and Cummins 1963, 1965Cummins 1971;Cummins and Hiratsuka 2003). The alternate host(s) and morphology of the aecial state have also been utilized to delimit heteroecious rusts.…”