Skip to main content
ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #323596
Title: Evaluation of soybean breeding lines for resistance to phomopsis seed decay in stoneville mississippi 2014

Author
item Li, Shuxian
item Smith, James - Rusty

Submitted to: Plant Disease Management Reports
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/8/2016
Publication Date: 3/7/2016
Publication URL: http://handle.nal.usda.gov/10113/62350
Citation: Li, S., Smith, J.R. 2016. Evaluation of soybean breeding lines for resistance to phomopsis seed decay in stoneville mississippi 2014. Plant Disease Management Reports. 10:FC045.

Interpretive Summary: Phomopsis seed decay (PSD) of soybean is a major cause of poor seed quality in most soybean production areas, especially in the mid-southern region of the United States. Breeding for PSD-resistance is the most effective long-term strategy to control this disease. In this study, a total of 146 soybean breeding lines developed from the crosses between PSD-resistant and high-germination lines, as well as between PSD-resistant lines were planted at Stoneville, MS in 2014 for evaluation of resistance to PSD. Based on the seed assay, the range of Phomopsis seed infection was from 0 to 52% with an overall mean of 7.5%. In the cross of PI 80837 x SS93-6181 (Resistant x Resistant line), seven out of 11 plants had Phomopsis seed infection over 10%, but one plant was free from PSD. In the crosses of DS25-1 x PI 424324B and DS25-1 x PI 417050, 33 and 26 plants, respectively, had zero percent Phomopsis seed infection. Some of these soybean breeding lines have good potential to be released as resistant to PSD. All soybean plants tested in 2014 were planted in the field in 2015 for further evaluation of their resistance to PSD.

Technical Abstract: Phomopsis seed decay (PSD) of soybean is a major cause of poor seed quality in most soybean production areas, especially in the mid-southern region of the United States. Breeding for PSD-resistance is the most effective long-term strategy to control this disease. To breed soybean lines with resistance to PSD, multiple populations were developed from crosses between PSD-resistant and high-germination lines, as well as between PSD-resistant lines. A total of 146 soybean breeding lines derived from the above crosses were planted at Stoneville, MS on 12 and 19 May, 2014 for evaluation of resistance to PSD. Breeding lines were derived from six pedigrees and utilized five sources of PSD-resistance. Based on the seed plating assay, there were significant differences in reaction to PSD among plants within the same source, as well as among plants from different sources. However, there was no difference among source means. Overall, the range of Phomopsis seed infection was from 0 to 52% with an overall mean of 7.5%. In the pedigree of PI 80837 x SS93-6181 (Resistant x Resistant line), seven out of 11 plants had Phomopsis seed infection over 10%, but one plant was free from PSD. In the pedigrees of DS25-1 x PI 424324B and DS25-1 x PI 417050, 33 and 26 plants, respectively, had zero percent Phomopsis seed infection. Some of these soybean breeding lines have good potential to be released as resistant to PSD. All soybean plants tested in 2014 were planted in the field in 2015 for further evaluation of their resistance to PSD.