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Effects of recessive alleles for low alkaloid content on chemical and agronomic characteristics of burley tobacco nicotiana tabacum



Effects of recessive alleles for low alkaloid content on chemical and agronomic characteristics of burley tobacco nicotiana tabacum



Crop Science 22(3): 499-503



Conventional [cv. Burley 21] and doubled haploid derived alkaloid lines were studied to determine the effects of recessive alleles for low alkaloid content on chemical and agronomic characteristics of tobacco (N. tabacum L.) Statistically significant differences were detected among genotypes for total alkaloids, total-N, protein-N, and total volatile nitrogenous bases (TVNB). Levels of total-N and TVNB were higher in high alkaloid lines, but, in general, protein-N was higher in low alkaloid lines. Dominant alleles at both the A and B alkaloid loci were associated with higher levels of total alkaloids, total-N and TVNB, but lower levels of protein-N, than were recessive alleles. Significant differences in nitrate-N concentrations were not detected between dominant and recessive alleles at either locus. Although significant genotypic differences were detected for several agronomic characteristics, no consistent ranking of genotypes was evident. Conventional lines contained significantly higher concentrations of total alkaloids and TVNB and lower concentrations of protein-N than did doubled haploid-derived lines. Conventional lines had larger bottom leaves, greater yield and earlier maturity dates than did haploid derived lines.

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Accession: 005322902

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