Volume 47, Number 7, 268-271, DOI: 10.1007/BF02864828

Potato clones remain free from leaf roll virus after repeated attempts to infect them

J. P. Mackinnon

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Abstract

Potato seedlings grown from true seed were screened for resistance to leaf roll virus. Infected seedlings were discarded, and the screening process was repeated for four subsequent tuber generations. Forty-one of an original 717 clones (six crosses and three selfed lines) remained free from the virus. Challenge inoculations were made with aphids,Myzus persicae (Sulz.), that had been colonized on infected excised leaves ofPhysalis floridana Rydb. Recovery tests were attempted with non-viru-liferous aphids that were tested on healthyP. floridana.
In comparative tests, more clones remained free from the virus among progeny of the cross F5569×F4896 and of a self of the Katahdin variety, than among any other progeny tested.
Se examinaron plantulas de papa provenientes de semilla botánica en busca de resistencia contra el virus del enrollamineto de hoja.
El proceso de examinación y eliminación fue repetido durante cuatro generaciones subsiguientes de tuberculos. De los 717 clones originarios (seis cruces y tres autofecundaciones) 41 permanecieron libres del virus.
Inoculaciones de detección (challenge) fueron hechas con áfidos,Myzus persicae (Sulz.) los cuales habian sido colonizados en hojas cortadas dePhysalis floridana Rydb. Tests de recuperación fueron intentados con áfidos no viruliferos. La prueba fue llevada a cabo en plantas sanas deP. floridiana.
Comparando los diferentes tests se observo que clones de la progenie del cruce F5569×F4896 y de una autofecundacion de la variedad Katahdin presentaron un mayor porcentaje de plantas libres de virus.

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