QTL mapping of yield, agronomic and quality traits in tetraploid potato (Solanum tuberosum subsp. tuberosum) |
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Authors: | John E Bradshaw Christine A Hackett Barnaly Pande Robbie Waugh Glenn J Bryan |
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Institution: | (1) SCRI, Invergowrie, Dundee, DD2 5DA, UK;(2) Biomathematics and Statistics Scotland, SCRI, Invergowrie, Dundee, DD2 5DA, UK |
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Abstract: | Interval mapping of quantitative trait loci (QTL) for 16 yield, agronomic and quality traits in potato was performed on a
tetraploid full-sib family comprising 227 clones from a cross between processing clone 12601ab1 and table cultivar Stirling.
Thirty-eight AFLP primer combinations and six SSRs provided 514 informative markers which formed a molecular marker map comprising
12 linkage groups (LGs) in 12601ab1 (nine with four homologous chromosomes) which were aligned with 12 in Stirling (11 with
four homologous chromosomes), with four partial groups remaining in 12601ab1. Two LGs were identified unequivocally as chromosomes
IV and V and eight others were tentatively assigned with chromosomes VII and X unidentified. All of the traits scored had
moderately high heritabilities with 54–92% of the variation in clone means over 3 years and two replicates being due to genetic
differences. A total of 39 QTLs were identified. A QTL for maturity was identified on chromosome V which explained 56% of
the phenotypic variance, whereas the other QTLs individually explained between 5.4 and 16.5%. However, six QTLs were detected
for after-cooking blackening and four for each of regularity of tuber shape, fry colour both after storage at 4 and 10°C and
sprouting. Just two QTLs were found for each of yield, the two ‘overall’ scores, crop emergence, tuber size and common scab
and just one QTL was detected for each of dry matter content, keeping quality, growth cracks and internal condition. The implications
for practical potato breeding and for practical linkage and QTL analysis in autotetraploids are discussed. |
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