Registration of high-yielding exotically-derived soybean germplasm line LG03-4561-14

Authors: Smith, James - Rusty; Gillen, Anne; Nelson, Randall; Bruns, Herbert; Mengistu, Alemu; Li, Shuxian; Bellaloui, Nacer

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/7/2018
Publication Date: 2/28/2019
Citation: Smith, J.R., Gillen, A.M., Nelson, R.L., Bruns, H.A., Mengistu, A., Li, S., Bellaloui, N. 2019. Registration of high-yielding exotically-derived soybean germplasm line LG03-4561-14. Journal of Plant Registrations. 13:237-244. https://doi.org/10.3198/jpr2018.09.0061crg.
DOI: https://doi.org/10.3198/jpr2018.09.0061crg

Interpretive Summary: Studies by geneticists have shown that current U.S. soybean cultivars have only a few ancestors. This could lead to weaknesses in the U.S. soybean crop if new deadly diseases emerge, if the environment were to become increasingly stressful, or if soybean breeders could no longer improve the yields of new cultivars. To guard against these potential problems, the number and diversity of ancestors in future soybean cultivars needs to be expanded. New ancestors with positive genes for yield improvement, disease resistance, and tolerance to weather stresses need to be included in the pedigrees of new cultivars. A new soybean line (LG03-4561-14) was developed and released by the USDA, Agricultural Research Service in 2018. It has new and more diverse soybean ancestors, but still yields as well as current commercial cultivars. LG03-45461-14 is especially adapted to be planted very early in the midsouthern U.S., where planting early is a strategy used by farmers to avoid late season droughts. LG03-4561-14 is resistant to southern stem canker and frogeye leaf spot diseases, but susceptible to other fungal diseases, such as charcoal rot. It is also susceptible to microscopic round worms called nematodes that live in the soil. LG03-4561-14 was released to public and commercial soybean breeders so that they could use it in the development of new higher-yielding soybean cultivars for farmers.

Technical Abstract: The release of soybean [Glycine max (L.) Merr.] germplasm line LG03-4561-14 (Reg. No. ____, PI____) is part of an effort to expand the current narrow genetic base of the U.S.A. soybean breeding pool by incorporating new genetic diversity from exotic sources. LG03-4561-14 is a high-yielding, conventional, late maturity group III germplasm line that brings in new genetic diversity for potentially increasing seed yield. LG03-4561-14 was developed and released by the USDA Agricultural Research Service, Stoneville, MS, U.S.A. LG03-4561-14 was derived from FC 04007B and PIs 68508 and 445837, and has 25% exotic parentage. In four years of testing in the Southern Uniform Tests, LG03-4561-14 (3168 kg ha-1) was equivalent in yield to the high-yielding commercial cultivars AG3803 (3190 kg ha-1) and AG3934RR2Y (3214 kg ha-1). In the early production system of the midsouthern U.S.A., the seed yields across five years at Stoneville, MS of LG03-4561-14 (4242 kg ha-1), AG3803 (4659 kg ha-1), and AG3934RR2Y (4788 kg ha-1) were not significantly different. LG03-4561-14 is resistant to southern stem canker (Diaporthe aspalathi E. Jansen, Castl. & Crous) and frogeye leaf spot (Cercospora sojina Hara), but susceptible to soybean cyst nematode (Heterodera glycines Ichinohe), root-knot nematodes {[Meloidogyne incognita (Kofoid and White) Chitwood] and [Meloidogyne arenaria (Neal) Chitwood]}, sudden death syndrome (Fusarium virguliforme O’Donnell & T. Aoki), charcoal rot [Macrophomina phaseolina (Tassi) Goid.], and Phomopsis seed decay [Phomopsis longicolla T. W. Hobbs (syn. Diaporthe longicolla)]. LG03-4561-14 will be a valuable source of new genetic diversity for soybean breeding programs in both the public and private sectors.