Submitted to: Journal of Breeding Science
Publication Type: Peer reviewed journal
Publication Acceptance Date: 12/6/2011
Publication Date: 2/4/2012
Citation: Sugimoto, T., Yoshida, S., Kato, M., Kaga, A., Hajika, M., Watanabe, K., Masataka, A., Matoh, T., Walker, D.R., Biggs, A.R., Ishimoto, M. 2012. Pathogenic diversity of Phytophthora sojae and breeding strategies to develop Phytophthora-resistant soybeans. Journal of Breeding Science. 61:511-522. Interpretive Summary: This review article summarizes knowledge about Phytophthora stem and root rot, caused by Phytophthora sojae, which is one of the most widespread and economically destructive diseases of soybean worldwide. The planting of resistant cultivars with either race-specific or partial resistance to diverse races has been an effective component of disease management. Marker-assisted selection using DNA markers tightly linked to Rps genes conditioning resistance to specific races or to quantitative trait loci associated with partial resistance can facilitate the development of new resistant cultivars when used to supplement conventional breeding efforts, but breeders must decide which Rps gene(s) to select for on the basis of the composition of P. sojae populations in the targeted soybean production region(s). This article will be of interest to plant breeders and plant pathologists.
Technical Abstract: Phytophthora stem and root rot disease, caused by Phytophthora sojae, is one of the most destructive diseases of soybean (Glycine max (L.) Merr.), and has been increasing in several soybean-producing areas around the world. This disease induces serious limitations on soybean production, with yield losses ranging from 4 to 100%. The most effective method to reduce damage from this disease to soybean would be to develop and establish Phytophthora-resistant cultivars. To date, two types of host resistance, 1) race-specific resistance with single dominant Rps genes, and 2) partial resistance (tolerance or field resistance) conferred by multiple genes, could provide reasonable protection from this pathogen. Molecular markers linked to the Rps genes for race-specific resistance or to quantitative trait loci for partial resistance have been discovered on several molecular linkage groups representing chromosomes. These markers will make it possible to screen for Phytophthora-resistant plants rapidly and efficiently. This paper reviews pathogenic races of Phytophthora sojae around the world, selection of soybean resistance sources with Rps genes or partial resistance, and the current state and future scope of breeding Phytophthora-resistant soybean cultivars with race-specific resistance and/or partial resistance.