Effects of infection with Rhynchosporium secalis on some components of growth and yield in two barley cultivars
Authors AffiliationsM.A. Jackson was Postgraduate Research Plant Pathologist in the Department of Plant Pathology, University of California, Davis; R.K. Webster was Professor of Plant Pathology and Plant Pathologist in the Experiment Station, Davis.
Hilgardia 49(4):1-14. DOI:10.3733/hilg.v49n04p014. April 1981.
Two cultivars of barley, Numar and Briggs, differing in their susceptibility to Rhynchosporium secalis, but without any known vertical genes for disease resistance, were grown in replicate plots and either inoculated with race 74 of R. secalis or sprayed with Benlate for disease control. Measurements included height, numbers of various plant parts, leaf area, dry weight of plant parts, yield components and grain yield. Analysis of the data indicated the more resistant variety Briggs, outyielded the susceptible variety Numar, and differed in other growth components. Calculation of leaf life span indicated this was a key difference between varieties with respect to disease resistance. Further testing on the relationship between leaf life span and disease resistance is necessary, but measurement of leaf life span may be a useful tool in screening breeding material for a background level of horizontal resistance, as well as leading to better understanding of a mechanism of disease resistance.
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