Evaluation of tobacco mosaic resistance factor transferred from burley to flue-cured tobacco

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Abstract
Isogenic or near isogenic lines of flue-cured tobacco were produced containing the N. glutinosa type of mosaic resistance from Burley 21. The mosaic resistance factor was transferred into six cultivars of flue-cured tobacco by the backcross method. From each backcross family two resistant selections and one sister susceptible selection were compared with their recurrent parent for agronomic and chemical characteristics. The mosaic resistance factor was associated with reduced yield and off-quality charac teristics. These results parallel those of a previous study in which resistance from Va. 45 was used, so that it may be inherently difficult to disassociate these adverse characteristics from TMV resistance in flue-cured tobacco. Breeding techniques that might offset these unfavorable associations should be explored, or a new segmental substitution attempted.