Reference Report for IND22041766
| Title: | Influence of wp on pod characteristics and agronomic traits of soybean lines |
| Authors: | Gay, D.C., Hegstad, J.M., Stephens, P.A., Nickell, C.D. |
| Source: | Soybean Genet. Newsl. 1999, v. 26 |
| Abstract: | Homozygous recessive wp alleles produce pink flower colour in soyabean when in the presence of the non-allelic gene W1 by modifying the expression of purple pigmentation. In the literature, there are no reports relating flower colour with seeds per pod or loculi per pod. The objective of this study was to describe the influence of wp upon pod characteristics and agronomic traits when crossed into a different genetic background. The materials in this study were F5-derived lines from the cross LN89-5322-2 (W1W1wpwp) √ó Burlison (w1w1WpWp), or its reciprocal. F2-derived families were generated based upon flower colour with no selection pressure for agronomic characteristics. In the summer of 1994, individual plants from seven F2:5 families were selected. These families represent four possible combinations of flower colour from this cross. Two families segregated pink/white (W1w1wpwp) (LNPK90-107-2-36 and LNPK90-114-1-15), two segregated purple/pink (W1W1Wpwp) (LNPK90-107-1-33 and LNPK90-107-1-18), one segregated purple/white (W1w1WpWp) (LNPK90-107-1-12), and two segregated purple/pink/white (W1w1Wpwp) (LNPK90-107-3-6 and LNPK90-1-27) for flower colour. Both pink/white families and one purple/pink family also segregated for pubescence colour. From each family approximately 120 plants were tagged by flower colour, and the total number of seeds and loculi of each pod were counted for each plant. One hundred plants were selected from each of the seven families, based on total seeds produced, for single progeny line testing in 1995. Nine agronomic traits were recorded during the growing season and at harvest and statistical comparisons were made among flower colour types within each family for each of the recorded agronomic traits. Differences in agronomic traits were evident when W1W1wpwp (pink flower) lines were compared with W1W1WpWp (purple flower) lines. The data show that wpwp appears to be associated with reduced seed yield, fewer loculi per pod, fewer seeds per pod, and higher seed protein concentration compared with WpWp lines. Yield differences in this study may be attributed to a reduction in seeds per pod associated with wp. The results suggest that wp may influence seed protein concentration. Lines containing wpwp averaged 1.4% higher seed protein concentration than WpWp lines. In the populations examined, soyabean lines containing wpwp averaged lower yield, fewer loculi per pod, fewer seeds per pod, and higher seed protein concentration than WpWp lines. Lower seed yield for pink flowered lines may be the result of a reduction in seeds per pod and loculi per pod. The association of wp and yield, seed size, protein, loculi per pod, and seeds per pod is likely the result of linkage or pleiotropy and the data suggest that a high yielding, high protein wpwp line could be developed through crossing and selection. |
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