Abstract
We report here the first genetic linkage maps of pecan [Carya illinoinensis (Wangenh.) K. Koch], using random amplified polymorphic DNA (RAPD) and amplified fragment length polymorphism (AFLP) markers. Independent maps were constructed for the cultivars ‘Pawnee’ and ‘Elliot’ using the double pseudo-testcross mapping strategy and 120 F1 seedlings from a full-sib family. A total of 477 markers, including 217 RAPD, 258 AFLP, and two morphological markers were used in linkage analysis. The ‘Pawnee’ linkage map has 218 markers, comprising 176 testcross and 42 intercross markers placed in 16 major and 13 minor (doublets and triplets) linkage groups. The ‘Pawnee’ linkage map covered 2,227 cM with an average map distance of 12.7 cM between adjacent markers. The ‘Elliot’ linkage map has 174 markers comprising 150 testcross and 22 intercross markers placed in 17 major and nine minor linkage groups. The ‘Elliot’ map covered 1,698 cM with an average map distance of 11.2 cM between adjacent markers. Segregation ratios for dichogamy type and stigma color were not significantly different from 1:1, suggesting that both traits are controlled by single loci with protogyny and green stigmas dominant to protandry and red stigmas. These loci were tightly linked (1.9 cM) and were placed in ‘Elliot’ linkage group 16. These linkage maps are an important first step towards the detection of genes controlling horticulturally important traits such as nut size, nut maturity date, kernel quality, and disease resistance.
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Beedanagari, S.R., Dove, S.K., Wood, B.W. et al. A first linkage map of pecan cultivars based on RAPD and AFLP markers. Theor Appl Genet 110, 1127–1137 (2005). https://doi.org/10.1007/s00122-005-1944-5
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DOI: https://doi.org/10.1007/s00122-005-1944-5