Home

Organizing Committee

Presentations

Poster Presentations

Outcomes


Poster Presentations


Field evaluation of early maturing Chinese soybean germplasm for rust resistance.

Presenter: Dechun Wang, Dept. of Crop & Soil Sci., Michigan State University
Coauthor(s): Huaigu Chen, Jiangsu Acad. of Agri. Sci., Nanjing, Jiangsu, China; Ray Hammerschmidt, Dept. of Plant Pathology, Michigan State Univ.; Ying Luo/Sanming, Institute of Agri. Sci., Sanming, Fujian, China; Shuming Wang, Jilin Acad. of Agri. Sci., Gongzhuling, Jilin, China.

Soybean rust has been reported as a major yield-reducing disease in many countries throughout the world. Fungicide application is currently the major method to control the disease. Very limited sources of soybean germplasm are known to possess some level of resistance. The objective of this research was to evaluate early maturing Chinese soybean germplasm for rust resistance in the field. Over 1,800 accessions of early maturing Chinese soybean germplasm were evaluated for rust resistance in two rust nurseries, one in Jiangsu Province and the other in Fujian Province of China, in 2004 and 2005. Each accession was planted in single one-meter row plots with two replications at each nursery. The rust nursery in Fujian was naturally infected and the rust nursery in Jiangsu was inoculated with mixtures of rust pathogen originally collected from Fujian. The nursery in Jiangsu was inoculated several times during V3, R1, and R2 stages with urediniospores of Phakopsora pachyrhizi. Ten plants from each plot were rated for rust severity 10-15 days before maturity using a rating system modified from the system developed by the International Working Group on Soybean Rust (IWGSR) in 1976. Nineteen accessions showed resistance in both nurseries in 2004 and four of these accessions remain resistant in both nurseries in 2005. Over 20 additional accessions showed resistance in both nurseries in 2005. These accessions will be further evaluated to confirm or negate their rust resistance.

View Poster                                         Back to Poster Presentations