Abstract
Seed and seedling traits related to germination and stand establishment are important in the production of cultivated lettuce (Lactuca sativa L.). Six seed and seedling traits segregating in a L. sativa cv. Salinas x L. serriola recombinant inbred line population consisting of 103 F8 families revealed a total of 17 significant quantitative trait loci (QTL) resulting from three seed production environments. Significant QTL were identified for germination in darkness, germination at 25 and 35°C, median maximum temperature of germination, hypocotyl length at 72 h post-imbibition, and plant (seedling) quality. Some QTL for germination and early seedling growth characteristics were co-located, suggestive of pleiotropic loci regulating these traits. A single QTL (Htg6.1) described 25 and 23% of the total phenotypic variation for high temperature germination in California- and Netherlands-grown populations, respectively, and was significant between 33 and 37°C. Additionally, Htg6.1 showed significant epistatic interactions with other Htg QTL and a consistent effect across all the three seed production environments. L. serriola alleles increased germination at these QTL. The estimate of narrow-sense heritability (h2) of Htg6.1 was 0.84, indicating potential for L. serriola as a source of germination thermotolerance for lettuce introgression programs.
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This work was supported by the United States Department of Agriculture Initiative for Future Agriculture and Food Systems grant No. 00–52100–9609 and by National Science Foundation grant DBI-0421630.
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Argyris, J., Truco, M.J., Ochoa, O. et al. Quantitative trait loci associated with seed and seedling traits in Lactuca . Theor Appl Genet 111, 1365–1376 (2005). https://doi.org/10.1007/s00122-005-0066-4
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DOI: https://doi.org/10.1007/s00122-005-0066-4