Mapping QTLs for developmental traits in raspberry from bud break to ripe fruit |
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Authors: | Julie Graham Christine A Hackett Kay Smith Mary Woodhead Ingo Hein Susan McCallum |
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Institution: | (1) SCRI, Invergowrie, Dundee, DD2 5DA, Scotland, UK;(2) BioSS, Invergowrie, Dundee, DD2 5DA, Scotland, UK |
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Abstract: | Protected cropping systems have been adopted by the UK industry to improve fruit quality and extend the current season. Further
manipulation of season, alongside consideration of climate change scenarios, requires an understanding of the processes controlling
fruit ripening. Ripening stages were scored from May to July across different years and environments from a raspberry mapping
population. Here the interest was in identifying QTLs for the overall ripening process as well as for the time to reach each
stage, and principal coordinate analysis was used to summarise the ripening process. Linear interpolation was also used to
estimate the time (in days) taken for each plot to reach each of the stages assessed. QTLs were identified across four chromosomes
for ripening and the time to reach each stage. A MADS-box gene, Gene H and several raspberry ESTs were associated with the
QTLs and markers associated with plant height have also been identified, paving the way for marker assisted selection in Rubus idaeus. |
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