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Genetic Analysis of Soybean Plant Introductions with Resistance to Phytophthora sojae

Phytophthora sojae, which causes Phytophthora root and stem rot of soybean, is a serious disease worldwide and is managed primarily by deploying cultivars with resistance. Thirty-two soybean plant introductions (PIs), all but three of which were from South Korea, were proposed as new sources of sing...

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Published in:Phytopathology 2007, Vol.97 (1), p.106-112
Main Authors: Gordon, S.G, Berry, S.A, St. Martin, S.K, Dorrance, A.E
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container_title Phytopathology
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creator Gordon, S.G
Berry, S.A
St. Martin, S.K
Dorrance, A.E
description Phytophthora sojae, which causes Phytophthora root and stem rot of soybean, is a serious disease worldwide and is managed primarily by deploying cultivars with resistance. Thirty-two soybean plant introductions (PIs), all but three of which were from South Korea, were proposed as new sources of single-gene resistance to P. sojae. The objective of this study was to characterize the inheritance of resistance to P. sojae in these PIs. Twenty-two soybean populations from crosses of these PIs and the susceptible cv. Williams were inoculated with P. sojae OH17 (vir 1b, 1d, 2, 3a, 3b, 3c, 4, 5, 6, 7), and OH25 (vir 1a, 1b, 1c, 1k, 7). These isolates were selected because they are virulent on soybeans with all known Rps genes and many Rps gene combinations. Thirteen of the twenty-two populations had consistent segregation responses following inoculations between the two generations. In two PIs, resistance was conferred by two genes to OH17 and three genes to OH25. Resistance to both isolates was conferred by a single gene in PI 398440 although the individual families were not resistant to the same isolates. The data suggest that six of the populations have three-Rps gene combinations as previously proposed, while another four may have either a novel Rps gene or a four-Rps gene combination. Based on this phenotypic analysis, novel and uncharacterized Rps genes may be present in this material. More importantly, these PIs may serve as sources of novel Rps genes that can be used to more effectively manage Phytophthora root and stem rot.
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Thirty-two soybean plant introductions (PIs), all but three of which were from South Korea, were proposed as new sources of single-gene resistance to P. sojae. The objective of this study was to characterize the inheritance of resistance to P. sojae in these PIs. Twenty-two soybean populations from crosses of these PIs and the susceptible cv. Williams were inoculated with P. sojae OH17 (vir 1b, 1d, 2, 3a, 3b, 3c, 4, 5, 6, 7), and OH25 (vir 1a, 1b, 1c, 1k, 7). These isolates were selected because they are virulent on soybeans with all known Rps genes and many Rps gene combinations. Thirteen of the twenty-two populations had consistent segregation responses following inoculations between the two generations. In two PIs, resistance was conferred by two genes to OH17 and three genes to OH25. Resistance to both isolates was conferred by a single gene in PI 398440 although the individual families were not resistant to the same isolates. 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Plant and forest protection</topic><topic>Phytophthora sojae</topic><topic>plant breeding</topic><topic>plant pathogenic fungi</topic><topic>progeny testing</topic><topic>soybeans</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gordon, S.G</creatorcontrib><creatorcontrib>Berry, S.A</creatorcontrib><creatorcontrib>St. Martin, S.K</creatorcontrib><creatorcontrib>Dorrance, A.E</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Phytopathology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gordon, S.G</au><au>Berry, S.A</au><au>St. Martin, S.K</au><au>Dorrance, A.E</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Genetic Analysis of Soybean Plant Introductions with Resistance to Phytophthora sojae</atitle><jtitle>Phytopathology</jtitle><addtitle>Phytopathology</addtitle><date>2007</date><risdate>2007</risdate><volume>97</volume><issue>1</issue><spage>106</spage><epage>112</epage><pages>106-112</pages><issn>0031-949X</issn><eissn>1943-7684</eissn><coden>PHYTAJ</coden><abstract>Phytophthora sojae, which causes Phytophthora root and stem rot of soybean, is a serious disease worldwide and is managed primarily by deploying cultivars with resistance. 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subjects Biological and medical sciences
cultivars
disease resistance
Fundamental and applied biological sciences. Psychology
fungal diseases of plants
Fungal plant pathogens
genetic resistance
genetic variation
Glycine max
pathogenicity
Phytopathology. Animal pests. Plant and forest protection
Phytophthora sojae
plant breeding
plant pathogenic fungi
progeny testing
soybeans
title Genetic Analysis of Soybean Plant Introductions with Resistance to Phytophthora sojae
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