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Managing on-farm biosecurity risk through pre-emptive breeding: rust of pea and lentils

AutorBarilli, Eleonora ; Rubiales, Diego ; Lichtenzveig, Judith; Lee, Robert
Fecha de publicación2017
EditorInstitute of Field and Vegetable Crops
CitaciónCOSTWG1 / EPPN2020 workshop: 88 (2017)
ResumenRust is a significant yield constraint in the production of lentil and field pea in various regions of the world. Rust is incited by Uromyces viciae-fabae in lentils and in in peas under tropical conditions, while U. pisi is the principal agent causing pea rust in temperate regions. A pea and lentil germplasm collection consisting on more than 300 accessions including current elite cultivars and breeding lines selected in key rust host-spots, were evaluated in terms of rust resistance under field and controlled conditions to allow the identification of novel sources of resistance and introgression of resistant loci into locally adapted elite germplasm. Plants were artificially inoculated and were macroscopically evaluated under field conditions at Córdoba, Spain during two growing seasons. In addition, germplasm was also evaluated under controlled conditions against 4 different rust isolates from various origins. Plant responses were assessed in terms of infection type (IT) and percentage of disease severity (DS %). The most common response of pea to U. pisi was of susceptibility, with all pea accessions showing compatible reaction with mature pustules (IT=4) although 17% of them showed partial resistance associated with reduced DS (<10%). Similarly, susceptibility was also very frequent in lentil accessions against U. viciae-fabae, although in this case low IT was identified. Still, 15% of the accessions showed DS < 10%. These results were validated under controlled conditions with isolates from diverse geographical origins. Selected resistant accessions are being crossed with elite Australian germplasm and markers associated with rust resistance will be developed.
DescripciónTrabajo presentado en COSTWG1 / EPPN2020 workshop, celebrado en Novi Sad (Serbia) el 29 y 30 de septiembre de 2017.
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