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GERMPLASM

Registration of Soybean Germplasm SS93-6012 and SS93-6181 Resistant to Phomopsis Seed Decay

^a Division of Plant Sciences, Univ. of Missouri–Columbia, Columbia, MO 65211
^b Division of Plant Sciences, Univ. of Missouri–Delta Center, P.O. Box 160, Portageville, MO 63873
^c Delta Research and Extension Center, Mississippi State Univ., Stoneville, MS 38776

^* Corresponding author (sleperd{at}missouri.edu).

ABSTRACT

Soybean [Glycine max (L.) Merr.] germplasm SS93-6012 (Reg. No. GP-362, PI 652442) and SS93-6181 (Reg. No. GP-363, PI 652443) were developed and released by the University of Missouri–Columbia in January 2006 as resistant to Phomopsis seed decay (PSD), caused by Phomopsis spp. Both lines were developed from a cross between MO/PSD-0259 (PI562694) (PSD-resistant MGIV germplasm) and ‘Asgrow 3834’ (PSD-susceptible MGIII cultivar) made in 1990 at the Bradford Research and Extension Center of the University of Missouri, Columbia, MO. The lines were composited in the F₅ generation and evaluated for yield and Phomopsis seed decay infection. These lines are highly resistant to Phomopsis spp. SS93-6012 has a relative maturity of 4.2, purple flowers, gray pubescence, an indeterminate growth habit, tan pods at maturity, yellow color seeds, buff hila, and seed weight of 14 g per 100 seeds. SS93-6181 has a relative maturity of 4.0, purple flowers, tawny pubescence, an indeterminate growth habit, tan pods at maturity, yellow color seeds, imperfect black hila, and seed weight of 16 g per 100 seeds. So far, PSD-resistant commercial soybean cultivars are not available, and these two lines may be used for development of PSD-resistant high-yielding soybean cultivars.

Abbreviations: BREC, Bradford Research and Extension Center • ESPS, early soybean production system • PI, Plant introduction • PSD, Phomopsis seed decay