|Sciumbato, Gabe -|
Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: January 26, 2012
Publication Date: March 30, 2012
Citation: Li, S., Sciumbato, G. 2012. Evaluation of maturity group III soybean lines for resistance to purple seed stain in Mississippi, 2010. Plant Disease. doi:10.1094/PDMR06: ST004. Interpretive Summary: Purple seed stain (PSS) caused 6.4 million bushels of yield losses in 16 southern states in 2009. It is an important disease that reduces seed quality and market grade and affects seed germination. To identify new sources of resistance to purple seed stain, 14 maturity group IV soybean lines were tested and planted at Stoneville, MS on 25 May 2010. Some soybean lines were resistant and some were susceptible to purple seed stain. PI 578486 and PI 437482 were among the lines with lowest disease rating. These soybean lines may be used in breeding programs to further reduce loss to PSS.
Technical Abstract: Purple seed stain (PSS) of soybean is an important disease caused by Cercospora kikuchii. PSS reduces seed quality and market grade, affects seed germination and vigor, and has been reported wherever soybeans are grown worldwide. In 2009, PSS caused 6.4 million bushels of yield losses in 16 southern states. To identify new sources of resistance to PSS, 14 maturity group IV soybean lines, originally from eight counties with different reactions to other diseases in previous trials, were screened in the field planted at Stoneville, MS on 25 May 2010. The experimental design was a randomized complete block with four replications. Seeds were harvested from each plot when the plants were mature. Seeds from each plot were tested for percent seed infection by C. kikuchii. Significant differences (P = 0.01) in seed infection by C. kikuchii were observed among soybean lines ranging from 2.0% to 16.0%. Soybean lines PI 578486 and PI 437482 were among the lines with lowest percentages of seed infection, while AG4403 had the highest percentage of seed infection. Of 14 lines tested, four lines had less than 5% seed infection. These soybean lines may be used in breeding programs to further reduce loss to PSS.