TABLE 3

Biometric parameters of individual QTLs conferring resistance to bacterial blight of cotton

Probable gene identitybNearest DNA markerChromosome or linkage groupVariation (%)Mode of gene actionc
PopulationXcm RaceaLODadd/a
Empire B22 (4)B2G121920103.1298.0−3.513.56−1.01D
Empire B32 (4)B3pGH510a2023.2188.2−2.70−1.110.41AR
18 (7)B3pGH510a2010.5653.4−0.75−0.010.01A
Empire B2b62 (4)B2G12192053.3692.2−3.603.50−0.97D
18 (7)Qb6aA1666U013.3226.9−2.74−0.850.31RA
18 (7)(Qb6b)P12-20a53.0722.40.52−3.46−6.65D
18 (7)Qb6cpAR827D043.5319.4−1.78−2.401.35R
18 (7)(Qb6d)pAR723143.0116.31.53−1.99−1.30D
S29518 (2, 4, 7)B12pAR0431450.4694.2−3.663.49−0.95D
  • A, additive; D, dominant; R, recessive (Paterson et al. 1991).

  • a Parentheses indicate Xcm race phenotypes that were highly correlated with the Xcm race phenotypes used to calculate biometric parameters.

  • b Parentheses indicate that the QTL had an effect opposite to that expected from the parental phenotype.

  • c Biometric parameters were calculated using “recessiveness” and “dominance” to refer to the behavior of the G. hirsutum alleles, a, (HH − BB)/2; d, H/B − [(HH + BB)/2)]. Mode indicates the gene action of individual QTLs with the G. hirsutum allele. When two modes of gene action could not be deemed unlikely, the more likely mode was listed first.