Reciprocal differences in intraspecies crosses of tobacco (Nicotiana tabacum L.)

Abstract

Reciprocal differences in a diallel cross experiment with air-cured tobacco strains were found to be significant for certain characteristics, but relatively small compared to differences between strains in general combining ability. A factorial analysis designed to detect maternal effects in the same material failed to substantiate significance for these characteristics. A separate experiment with flue-cured tobacco strains involving genome transfer by backcrossing, gave no indication of a cytoplasmic contribution to variation in the characteristics measured.Resiproke verskille in 'n dialleel-studie op lugdroog-tabak was betekenisvol vir enkele karakteristieke. Die variansiekomponent vir resiproke verskille was klein in vergelyking met die van algemene kombineervermoe en 'n faktoriale analise op dieselfde data vir moontlike moedereffekte het goon betekenisvolheid aangedui nie. In 'n aparte studie waar terugkruising gebruik is om 'n moontlike sitoplasmiese bydrae van Coker 139 tot verskeie genetiese agtergronde na te gaan kon geen sodanige bydrae vasgestel word nie.