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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #337744
Title: Evaluation of commercial soybean cultivars for reaction to Phomopsis seed decay

Author
item Li, Shuxian
item SCIUMBATO, GABE - Mississippi State University
item RUPE, JOHN - University Of Arkansas
item SHANNON, GROVER - University Of Missouri
item CHEN, PENGYIN - University Of Missouri
item Boykin, Deborah

Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/13/2017
Publication Date: 12/15/2017
Citation: Li, S., Sciumbato, G., Rupe, J., Shannon, G., Chen, P., Boykin, D.L. 2017. Evaluation of commercial soybean cultivars for reaction to Phomopsis seed decay. Plant Disease. 101(12):1990-1997. https://doi.org/10.1094/PDIS-02-17-0204-RE.
DOI: https://doi.org/10.1094/PDIS-02-17-0204-RE

Interpretive Summary: Phomopsis seed decay (PSD) is an economically important soybean disease causing poor seed quality. Planting resistant cultivars is one of the most effective means to control PSD. In this study, 16 commercially available soybean cultivars were evaluated for their resistance to PSD with pathogen and no-pathogen treatments and harvested promptly or with a two-week delay in harvest. Six cultivars (Morsoy R2 491, Progeny 5650, Progeny 5706, Asgrow 5606, Asgrow 5831 and Dyna-Gro33C59) had significantly reduced seed infection compared to the susceptible checks and previously reported resistant cultivar SS93-6181 in the same test. Information obtained from this study will be useful for soybean growers and breeders for selection of resistant cultivars for planting or developing cultivars with improved resistance to PSD.

Technical Abstract: Phomopsis seed decay (PSD), caused by Phomopsis longicolla (syn. Diaporthe longicolla), is an economically important soybean disease causing poor seed quality. Planting resistant cultivars is one of the most effective means to control PSD. In this study, 16 commercially available maturity groups IV and V soybean cultivars, including two previously identified PSD-resistant and two PSD-susceptible checks, were evaluated for seed infection by P. longicolla in inoculated and non-inoculated plots, and harvested promptly or with a two-week delay in harvest. The test was conducted at Stoneville, Mississippi in 2012 and 2013. Seed infection by P. longicolla ranged from 0.5% to 76%, and seed germination ranged from 18% to 97%. One MG IV cultivar, (Morsoy R2 491) and five MG V cultivars (Progeny 5650, Progeny 5706, Asgrow 5606, Asgrow 5831 and Dyna-Gro33C59) had significantly (P = 0.05) lower percent seed infected by P. longicolla than their respective susceptible checks and other cultivars including previously reported resistant cultivar SS93-6181 in the same test. Information obtained from this study will be useful for soybean growers and breeders for selection of cultivars for planting or breeding and future genetic studies in the development of cultivars with improved resistance to PSD.