@article{manjarrezsandoval_carter_webb_burton_1997, title={Heterosis in soybean and its prediction by genetic similarity measures}, volume={37}, ISSN={["1435-0653"]}, DOI={10.2135/cropsci1997.0011183X003700050005x}, abstractNote={Coefficient of parentage (CP) and restriction fragment length polymorphism‐based genetic similarity estimates (RFLP‐GS) have been proposed as measures of genetic distance in crop species. If these measures are to have application in practical breeding, it is important to validate their utility in predicting genetic traits of interest such as heterosis. The objectives of this paper were to (i) estimate heterosis for yield in soybean [Glycine max (L.) Merr.] adapted to the southern USA, and (ii) predict heterosis by means of CP and RFLP‐GS as genetic distance measures. Twenty‐four F2 populations were developed by crossing three testers (‘Young’, ‘Centennial’, and ‘Tracy’) eight contrasting parents, representing a wide range of CP and RFLPGS. The experimental material was divided into three sets representing the testers above, and was evaluated in eight replications at Clayton and Plymouth, NC, in 1994. Midparent heterosis for yield was 7.9, 4.5, and 7.9% for Sets 1, 2, and 3, respectively. Heterosis was 3.5, 1.6, and 3.0% for 100‐seed weight, and 4.1, 5.4, and 13.2% for plant height. The CP and RFLP‐GS were highly correlated (r = 0.80, 0.92 and 0.95 for Sets 1, 2, and 3, respectively, P = 0.01), but neither predicted heterosis well for yield averaged across locations because of a large genotype × environment (G × E) interaction. In contrast, CP and RFLP‐GS predicted heterosis well for 100‐seed weight and plant height in two of the three sets averaged over locations. Our estimates of high parent heterosis for yield (as high as 11% over locations), may justify soybean hybrids as a breeding objective. However, the limited predictive value of CP and RFLP‐GS in our study indicates that the identification of favorable heterotic combinations may require extensive field testing.}, number={5}, journal={CROP SCIENCE}, author={ManjarrezSandoval, P and Carter, TE and Webb, DM and Burton, JW}, year={1997}, pages={1443–1452} }
 @article{manjarrezsandoval_carter_webb_burton_1997, title={RFLP genetic similarity estimates and coefficient of parentage as genetic variance predictors for soybean yield}, volume={37}, ISSN={["1435-0653"]}, DOI={10.2135/cropsci1997.0011183X003700030002x}, abstractNote={RFLP genetic‐similarity estimates (RFLP‐GS) and coefficient of parentage (CP) have been used as measures of genetic similarity within crop species. However, practical application of these measures in plant breeding remains uncertain. This study was designed to probe the utility of RFLP‐GS and CP in predicting genetic variance (GV) for seed yield among inbred soybean [Glycine max (L.) Merr.] lines. achieve this goal, five single seed descent populations were studied, representing a range of RFLP‐GS and CP between the parents from 57 to 75% and 0.06 to 0.5, respectively. The GV for yield was estimated for each population through field evaluation of 30 inbred lines per population, in two North Carolina field locations during 1994. Both RFLP‐GS and CP correctly identified the population with the highest GV; however, CP predicted GV for yield more efficiently (rCP.RFLP‐GS = 0.91*; rCP.GV = −0.81*; and rRFLP‐GS.GV = −0,58). The GV was near zero when the CP between parents was larger than 0.27 or when RFLP‐GS was larger than 75%. Neither genotype × environment interaction nor low field precision were factors for the lower predictive value of RFLP‐GS. Expected gains from selection agreed partially with RFLP‐GS results but closely matched CP and the actual fate of populations in a USDA breeding program. These results indicated that caution should be taken in an applied soybean breeding program when crossing parents with a relationship larger than half‐sib or when the RFLP‐GS is larger than 75% when yield improvement is the main breeding objective.}, number={3}, journal={CROP SCIENCE}, author={ManjarrezSandoval, P and Carter, TE and Webb, DM and Burton, JW}, year={1997}, pages={698–703} }
 @article{manjarrez-sandoval_carter_webb_burton_1996, title={Can heterosis be predicted by genetic similarity measures in soybean?}, volume={23}, journal={Soybean Genetics Newsletter}, author={Manjarrez-Sandoval, P. and Carter, T. E., Jr. and Webb, D. M. and Burton, J. W.}, year={1996}, pages={192} }
 @article{manjarrez-sandoval_carter_webb_burton_1996, title={Coefficient of parentage and RFLP markers: Are they useful in predicting genetic variance in soybean populations?}, volume={23}, journal={Soybean Genetics Newsletter}, author={Manjarrez-Sandoval, P. and Carter, T. E., Jr. and Webb, D. M. and Burton, J. W.}, year={1996}, pages={197} }