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Genetic Diversity in Burley and Flue‐cured Tobacco 1
Author(s) -
Legg Paul D.,
Chaplin J. F.,
Williamson R. E.
Publication year - 1977
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1977.0011183x001700060032x
Subject(s) - backcrossing , curing of tobacco , biology , allele , nicotiana tabacum , locus (genetics) , chlorophyll , botany , genetic diversity , cultivar , genetics , horticulture , gene , population , demography , sociology
Chlorophyll content in burley and flue‐cured tobacco, Nicotiana tabacum L., is influenced by genetic factors at two major loci. Burley is genotypically yb 1 yb 1 yb 2 yb 2 an has a low chlorophyll level in growing plants; whereas, a dominant allele at either locus will give a high level of chlorophyll characteristic of flue‐cured tobacco. A backcrossing program was used to obtain lines that were near isogenic for all genetic factors except alleles at the yb loci. Comparison of converted burley fines (ones carrying a Yb allele) with flue‐cured cultivars and tests comparing the near isogenic lines indicated that most of the genetic differences between flue‐cured and burley tobacco in chemical composition resulted from the influence of alleles at the two yb loci. The only differences between the two classes were for polyphenols and reducing sugars, and these may have been independent of the yb loci. Even these two constituents, however, showed as much diversity within classes as between classes.