ISHS Acta Horticulturae 311: International Walnut Meeting
BEHAVIOUR OF THE PROGENY OF JUGLANS INTERSPECIFIC HYBRIDS TOWARDS CHERRY LEAF ROLL VIRUS (CLRV) |
| Authors: | F. Dosba, E. Germain |
| Abstract:
The majority of English walnut (Juglans regia L.) varieties are contaminated by a nepovirus, the Cherry leaf roll virus (CLRV), but since they do not show severe symptoms of infection, they may considered to be tolerant to CLRV. The other Juglans spp. are hypersensitive and so therefore do not allow virus multiplication. Thus, a black line develops at the graft-union, whenever J. regia grafted onto another Juglans spp. is contaminated by CLRV. In this study, the behaviour of F1 interspecific hybrids (J. nigra x J. regia), (J. major x J. regia) and their progeny BC1 was examined. All F1 and BC1 hybrids with J. nigra and J. major were found to be hypersensitive, including 50% of BC1 with J. regia. These results indicate that the character of hypersensitivity to CLRV is monogenic and dominant over the character of tolerance. Some BC1 hybrids with J. regia which were very vigorous and tolerant to CLRV, were selected as potential rootstocks. | |
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