Genetic studies of pea leaf-roll (top-yellows) virus resistance inPisum sativum

Abstract

Six pea cultivars and their Fl and F2 progenies were assessed for resistance to pea leaf-roll (top-yellows) virus infection under natural epidemic conditions. Two cultivars were highly resistant, two moderately resistant, and two highly susceptible; all Fl and the majority of F2 hybrids between any two cultivars showed a lower mean resistance than the better of the two parents. Resistance to infection was controlled by an additive system of inheritance, with "moderate" resistance being dominant to both susceptibility and high resistance. The effect of disease on components of yield was also shown to be inherited in a quantitative manner, but no hybrid combination exhibited high economic value for all characters. The effect of top-yellows infection on yield in the New Zealand pea experiment was similar to that on infected field beans in England.

Control of Plant Virus Diseases in Cool-Season Grain Legume Crops

“…van Leur, Kumari, et al (2013) quantified BLRV resistance in Australian pea cultivars, but did not find immunity. Crampton and Watts (1968) in New Zealand concluded that resistance to pea leaf-roll/top-yellows (likely a combination of BWYV and SbDV) was based on additive and dominant genes.…”

Inheritance of Viral Bean Leaf Roll Tolerance in Peas

“…Results of pea luteovirus resistance studies with peas were reported simultaneously by Drijfhout (1968) and Crampton and Watts (1968). Results reported by Wilson and Close (1973), Grylls and Peak (1969), and Johnstone and Duffus (1984) suggest that Crampton and Watts probably described resistance to either (or both) beet western yellows or subterranean clover redleaf luteoviruses.…”

“…728 variations in segregation ratios were noted. From segregation ratios of field-inoculated breeding progenies, Crampton and Watts (1968) concluded that resistance to "pea leaf-roll virus" (probably luteovirus complex) infection "was controlled by an additive system of inheritance, with moderate resistance being dominant to both susceptibility and high resistance".…”

Virus resistance of Australian pea (Pisum sativum) varieties

“…Both Drijfhout (1968) in the Netherlands and Baggett & Hampton (1991) in the USA concluded that the resistance was based on a single recessive gene, but commented on the difficulties in distinguishing between resistant and susceptible segregants. Crampton & Watts (1968) in New Zealand on the other hand concluded that resistance to pea leaf-roll (top-yellows) was based on additive and dominant genes. Wilson (1968) described studies of the vectors on 'pea leaf roll virus' in New Zealand, but did not confirm the identity of the causal organism with serology.…”