Biology Commons^™

Selection Of Populations Of Puccinia Recondita F. Sp. Tritici For Shortened Latent Period On A Partially Resistant Wheat Cultivar, Jeffrey Lehman

Biology and Earth Science Faculty Scholarship

Wild-type fungal population 851-WT was selected for shortened latent period on cv. CI 13227 for five uredinial generations to study the adaptation of Puccinia recondita f. sp. tritici to partially resistant wheat cultivars. Differences among wild-type and selected populations for traits contributing to parasitic fitness (i.e., latent period, infection frequency, and uredinium area and growth rate) were assessed in monocyclic infection experiments on susceptible cv. Monon and partially resistant cvs. Suwon 85, Sw 72469-6, L-574-1, and CI 13227. Differences were greatest among fungal populations on cv. CI 13227. The mean latent period of selected population 851-C5 was 2 days shorter …

Phenology Of Apothecium Production In Populations Of Monilinia Vaccinii-Corymbosi From Early- And Late-Maturing Blueberry Cultivars, Jeffrey Lehman

Biology and Earth Science Faculty Scholarship

Pseudosclerotia were evaluated for differences in timing of apothecium development in four controlled experiments conducted over a 2-year period. In a separate experiment, conidia from 10 randomly selected isolates from both of the fungal populations were used to inoculate open flowers. Germination of pseudosclerotia produced from these artificial inoculations also was evaluated. The timing and rate of shoot elongation for cvs. Weymouth and Jersey were assessed in one greenhouse and two field experiments. Average development times for the fungal population from cv. Weymouth were 8 to 15 days earlier or 33 to 42% less than those for the population from …

Genetic Variation In Latent Period Among Isolates Of Puccinia Recondita F. Sp. Tritici On Partially Resistant Wheat Cultivars, Jeffrey Lehman

Biology and Earth Science Faculty Scholarship

The durability of partially resistant wheat cultivars to wheat leaf rust depends on the amount of genetic variation in parasitic fitness within populations of the pathogen Pucciniareconditaf. sp.tritici. To assess the durability ofpanialresistance, phenotypic variation inlatentperiod (a major component of parasitic fitness) was quantified and partitioned into genetic and nongenetic components for isolates of P.reconditaf. sp.triticion susceptible and partially resistant cultivars. Latent periods among isolates differed by 24 to 27% on individual partially resistant cultivars. In simulated epidemics, isolates with short latent periods caused 2 to 2.5 times more disease and overcame 13 to 35% of the

resistance of four …