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Substantial yield losses and poor seed quality are frequently associated with Ascochyta blight infection of lentil caused by  Ascochyta lentis . Recently reported changes in aggressiveness of  A. lentis  have led to decreased resistance within cultivars, such as Northfield and Nipper in Australia. Furthermore, the narrow genetic base of the current breeding program remains a risk for further selective pathogen evolution to overcome other currently used resistances. Therefore, incorporation of potentially novel and diverse resistance genes into the advanced lines will aid to improve cultivar stability. To identify these, 30 genotypes sourced from five wild species ( Lens orientalis, L. odomensis, L. ervoides, L. nigricans  and  L. lamottei ), including eight previously reported resistance sources, were screened for disease reaction to two recently isolated and highly aggressive isolates. Subsequently, two  L. orientalis  accessions were found highly resistant and a further six  L. nigricans , one  L. odomensis , one  L. ervoides , one  L. lamottei , and one  L. orientalis  accessions were moderately resistant. Several of these were more resistant than the currently deployed resistance source, ILL 7537. Furthermore,  L. orientalis  accession ILWL 180 was consistently resistant against other highly aggressive isolates recovered from diverse geographical lentil growing regions and host genotypes, suggesting stability and potential for future use of this accession in the Australian lentil breeding program.

A Novel Lens orientalis Resistance Source to the Recently Evolved Highly Aggressive Australian Ascochyta lentis Isolates