Genetic mapping of QTLs conditioning soybean sprout yield and quality

Citation
Sh. Lee et al., Genetic mapping of QTLs conditioning soybean sprout yield and quality, THEOR A GEN, 103(5), 2001, pp. 702-709
Citations number
28
Categorie Soggetti
Plant Sciences","Animal & Plant Sciences
Journal title
THEORETICAL AND APPLIED GENETICS
ISSN journal
00405752 → ACNP
Volume
103
Issue
5
Year of publication
2001
Pages
702 - 709
Database
ISI
SICI code
0040-5752(200110)103:5<702:GMOQCS>2.0.ZU;2-6
Abstract
Soybean sprouts have been used as a food in the Orient since ancient times. In this study, 92 restriction fragment length polymorphism (RFLP) loci and two morphological markers (WI and T) were used to identify quantitative tr ait loci (QTLs) associated with soybean sprout-related traits in 100 F-2-de rived lines from the cross of 'Pureunkong' x 'Jinpumkong 2'. The genetic ma p consisted of 76 loci which covered about 756 cM and converged into 20 lin kage groups. Eighteen markers remained unlinked. Phenotypic data were colle cted in 1996 and 1997 for hypocotyl length, percentage of abnormal seedling s, and sprout yield 6 days after germination at 20 degreesC. Hypocotyl leng th was determined as the average length from the point of initiation of the first secondary root to the point of attachment of the cotyledons. The num ber of decayed seeds and seedlings, plus the number of stunted seedlings (l ess than 2-cm growth), was recorded a s abnormal seedlings. Seed weight was determined based on the 50-seed sample. Sprout yield was recorded as the t otal fresh weight of soybean sprouts produced from the 50-seed sample divid ed by the dry weight of the 50-seed sample. Four QTLs were associated with sprout yield in the combined analysis across 2 years. For the QTL linked to L154 on the Linkage Group (LG) G the positive allele was derived from Pure unkong (R-2 = 0.19), whereas at the other three QTLs (A089 on LG B1, A668n on LG K and B046 on LG L) the positive alleles were from Jinpumkong 2. QTLs conditioning seed weight were linked to markers A802n (LG B1), A069 (LG E) , Cr321 (LG F) and A235 (LG G). At these four markers, the Jinpumkong allel e increased seed weight. Markers KO I ln on LG B1, W1 on LG F and A757 on L G L were linked to QTLs conditioning hypocotyl length; and Bng119, K455n an d K418n to QTLs conditioning the abnormal seedlings. The QTLs conditioning sprout yield were in the same genomic locations as the QTLs for seed weight identified in this population or from previously published research, indic ating that QTLs for sprout yield are genetically linked to seed-weight QTLs or else that seed-weight QTLs pleiotropically condition sprout yield. Thes e data demonstrate that effective marker-assisted selection may be feasible for enhancing sprout yield in a soybean. The transgressive segregation of sprout yield, as well as the existence of two QTLs conditioning greater tha n 10% of the phenotypic variation in sprout yields provides an opportunity to select for progeny lines with a greater sprout yield than currently pref erred cultivars such as Pureunkong.