caa a22 4500 469097418 CHVBK 20180323133035.0 cr unu---uuuuu 170328e19920801xx s 000 0 eng 10.1007/BF00317245 doi (NATIONALLICENCE)springer-10.1007/BF00317245 Plant competition and disease in genetically diverse wheat populations [Elektronische Daten] [Maria Finckh, Christopher Mundt] Summary: The direct and indirect effects of plant genetic diversity on epidemics and the influence of disease on plant competition were investigated using the wheat (Triticum aestivum)/stripe rust (Puccinia striiformis) system. Replacement series consisting of a susceptible and a resistant wheat genotype or two wheat genotypes susceptible to different races of stripe rust were grown in the presence and absence of the pathogen. Stripe rust severity, number of seed heads, seed yield, and seed weight were determined separately for each wheat genotype in the mixtures and the pure stands. The frequency of susceptible genotypes in a mixture explained up to 67% of the variation in disease severity. However, competitive interactions among plant genotypes sometimes appeared to alter susceptibility and obscured the relationship. In pure stands of single genotypes, disease severity explained between 52 and 58% of the variation in seed yield. In mixtures, coefficients of determination were only 10 and 31%, suggesting a strong influence of plant-plant interactions on seed yield. These results suggest that host-parasite coevolutionary models need to account for the strong effect that specific plant genotype combinations may have on disease severity and plant reproduction. Springer-Verlag, 1992 Plant disease nationallicence Genetic diversity nationallicence Frequency-dependence nationallicence Triticum aestivum nationallicence Puccinia striiformis nationallicence Finckh Maria Department of Botany and Plant Pathology, Oregon State University, Cordley 2082, 97331-2902, Corvallis, OR, USA aut Mundt Christopher Department of Botany and Plant Pathology, Oregon State University, Cordley 2082, 97331-2902, Corvallis, OR, USA aut Oecologia Springer-Verlag 91/1(1992-08-01), 82-92 0029-8549 91:1<82 1992 91 442 https://doi.org/10.1007/BF00317245 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317245 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Finckh Maria Department of Botany and Plant Pathology, Oregon State University, Cordley 2082, 97331-2902, Corvallis, OR, USA aut NATIONALLICENCE 700 1- Mundt Christopher Department of Botany and Plant Pathology, Oregon State University, Cordley 2082, 97331-2902, Corvallis, OR, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 91/1(1992-08-01), 82-92 0029-8549 91:1<82 1992 91 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer