scholarly journals Identification of resistance loci towards phytophthora sojae ( Rps ) in South Korean soybean plant introductions 407974B and 424487B

Crop Science ◽  
2021 ◽  
Author(s):  
Carlos Bolaños‐Carriel ◽  
Amine Batnini ◽  
Leah K. McHale ◽  
Anne E. Dorrance
Keyword(s):  
Phytophthora Sojae ◽  
Soybean Plant ◽  
Plant Introductions ◽  
South Korean

scholarly journals Genetic Analysis of Soybean Plant Introductions with Resistance to Phytophthora sojae

2007 ◽  
Vol 97 (1) ◽  
pp. 106-112 ◽  
Author(s):  
S. G. Gordon ◽  
S. A. Berry ◽  
S. K. St. Martin ◽  
A. E. Dorrance
Keyword(s):  
Single Gene ◽  
Phytophthora Sojae ◽  
Stem Rot ◽  
Soybean Plant ◽  
Phenotypic Analysis ◽  
Plant Introductions ◽  
Two Generations ◽  
Rps Gene ◽  
Serious Disease ◽  
The Individual

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.

scholarly journals Molecular Marker Analysis of Soybean Plant Introductions with Resistance to Phytophthora sojae

2007 ◽  
Vol 97 (1) ◽  
pp. 113-118 ◽  
Author(s):  
S. G. Gordon ◽  
K. Kowitwanich ◽  
W. Pipatpongpinyo ◽  
S. K. St. Martin ◽  
A. E. Dorrance
Keyword(s):  
Ssr Markers ◽  
Plant Pathogens ◽  
Phytophthora Sojae ◽  
Soybean Plant ◽  
The Novel ◽  
Sources Of Resistance ◽  
Novel Genes ◽  
Plant Introductions ◽  
Molecular Marker Analysis ◽  
Simple Sequence

Molecular analysis of sources of resistance to plant pathogens should expedite and confirm novel gene discovery and consequently the development of disease resistant cultivars. Recently, soybean plant introductions (PIs) were identified that contain putative novel Rps genes for resistance to Phytophthora sojae. The number of resistance genes that confer resistance to P. sojae isolates OH17 (1b,1d,2,3a,3b,3c,4,5,6,7) and OH25 (1a,1b,1c,1k,7) was then determined in several of the PIs. The objective of this study was to determine if the Rps genes present in these PIs were associated with eight described Rps loci that have been mapped on soybean molecular linkage groups F, G, J, and N. Nine F2:3 soybean populations were genotyped with simple sequence repeat (SSR) markers linked to previously mapped Rps loci. The nine PI populations all had SSR markers associated (P < 0.01) with resistance to P. sojae isolate OH17 in the Rps1 region. Rps1c is a likely candidate in eight PIs but novel genes may also be possible, while novel genes may confer resistance in one PI to P. sojae isolate OHI7. Two or more Rps genes, including some that are potentially novel, confer resistance to P. sojae isolate OH25 in eight of the populations. However, based on the response to these two isolates, virulence already exists for at least some of the novel genes identified in this study.

scholarly journals New Sources of Resistance to Phytophthora sojae in the Soybean Plant Introductions

Plant Disease ◽  
2000 ◽  
Vol 84 (12) ◽  
pp. 1303-1308 ◽  
Author(s):  
A. E. Dorrance ◽  
A. F. Schmitthenner
Keyword(s):  
Partial Resistance ◽  
Single Gene ◽  
Germplasm Collection ◽  
The United States ◽  
Phytophthora Sojae ◽  
Soybean Plant ◽  
United States Department ◽  
Sources Of Resistance ◽  
Plant Introductions ◽  
Many Sources

Single dominant Rps genes have been highly effective in managing Phytophthora sojae. However, numerous physiological races of P. sojae have developed in response to deploying single gene resistance. New sources of resistance with potentially novel Rps genes are needed. A selection of accessions (PI273483 to PI427107) from the United States Department of Agriculture Soybean Germplasm collection were evaluated for resistance to P. sojae using the hypocotyl inoculation technique for Rps genes and the layer test for partial resistance. Of the 1,015 accessions tested, 159 accessions were susceptible to races 7 (vir 1a, 2, 3a, 3c, 4, 5, 6, 7), 17 (1b, 1d, 2, 3a, 3b, 3c, 4, 5, 6, 7), and 25 (1a, 1b, 1c, 1k, 7). However, 162 accessions were resistant to these three races and 32 accessions were resistant to an additional five races chosen specifically to elicit a susceptible interaction with two and three Rps gene combinations. In addition, 55.5% of the 887 accessions tested had high levels of partial resistance or tolerance (scores ≤4.0) to P. sojae. The majority of the accessions that were resistant to all of the races tested and those that had very high levels of partial resistance originated in the Republic of Korea. These results indicate that this region is an area with many sources of resistance to P. sojae for both specific Rps genes and partial resistance.

Putative Alleles for Increased Yield from Soybean Plant Introductions

Crop Science ◽  
2004 ◽  
Vol 44 (3) ◽  
pp. 784 ◽  
Author(s):  
E. A. Kabelka ◽  
B. W. Diers ◽  
W. R. Fehr ◽  
A. R. LeRoy ◽  
I. C. Baianu ◽  
...  
Keyword(s):  
Soybean Plant ◽  
Plant Introductions

scholarly journals Two Soybean Plant Introductions Display Slow Leaf Wilting and Reduced Yield Loss under Drought

2014 ◽  
Vol 200 (3) ◽  
pp. 231-236 ◽  
Author(s):  
S. M. Pathan ◽  
J.-D. Lee ◽  
D. A. Sleper ◽  
F. B. Fritschi ◽  
R. E. Sharp ◽  
...  
Keyword(s):  
Yield Loss ◽  
Soybean Plant ◽  
Plant Introductions

Within-field Pathogenic Diversity of Phytophthora sojae in Commercial Soybean Fields in Iowa

2009 ◽  
Vol 10 (1) ◽  
pp. 8 ◽  
Author(s):  
Alison E. Robertson ◽  
Silvia R. Cianzio ◽  
Sarah M. Cerra ◽  
Richard O. Pope
Keyword(s):  
The United States ◽  
Phytophthora Sojae ◽  
Soil Samples ◽  
Soybean Plant ◽  
North Central Region ◽  
North Central ◽  
The North ◽  
History Of ◽  
The Many ◽  
Pathogenic Diversity

Phytophthora root and stem rot (PRR), caused by the oomycete Phytophthora sojae, is an economically important soybean disease in the north central region of the United States, including Iowa. Previous surveys of the pathogenic diversity of P. sojae in Iowa did not investigate whether multiple pathotypes of the pathogen existed in individual fields. Considering the many pathotypes of P. sojae that have been reported in Iowa, we hypothesized multiple pathotypes could exist within single fields. In the research reported herein, several soil samples were collected systematically from each of two commercial fields with a history of PRR in Iowa, and each soil sample was baited separately for isolates of P. sojae. Numerous pathotypes of P. sojae were detected from both fields. As many as four pathotypes were detected in some soil samples (each consisting of six to eight soil cores), which suggests that a single soybean plant could be subjected to infection by more than one pathotype. This possibility presents important implications in breeding resistant cultivars and in the management of PRR. Accepted for publication 14 July 2009. Published 8 September 2009.

Putative Alleles for Increased Yield from Soybean Plant Introductions

Crop Science ◽  
2004 ◽  
Vol 44 (3) ◽  
pp. 784-791 ◽  
Author(s):  
E. A. Kabelka ◽  
B. W. Diers ◽  
W. R. Fehr ◽  
A. R. LeRoy ◽  
I. C. Baianu ◽  
...  
Keyword(s):  
Soybean Plant ◽  
Plant Introductions

scholarly journals Similarities in Seed and Aphid Transmission Among Soybean mosaic virus Isolates

Plant Disease ◽  
2007 ◽  
Vol 91 (5) ◽  
pp. 546-550 ◽  
Author(s):  
Leslie L. Domier ◽  
Todd A. Steinlage ◽  
Houston A. Hobbs ◽  
Yi Wang ◽  
Gabriel Herrera-Rodriguez ◽  
...  
Keyword(s):  
Mosaic Virus ◽  
Field Experiments ◽  
Soybean Mosaic Virus ◽  
Aphid Transmission ◽  
Amino Acid Sequences ◽  
Mechanical Transmission ◽  
Soybean Plant ◽  
Loss Of Function ◽  
Strain Specificity ◽  
Plant Introductions

Soybean mosaic virus (SMV) is an aphid- and seed-transmitted virus that infects soybean (Glycine max) plants and causes significant yield losses. Seed-borne infections are the primary sources of inoculum for SMV infections. The strain specificity of SMV transmission through seed and SMV-induced seed-coat mottling were investigated in field experiments. Six soybean plant introductions (PIs) were inoculated with eight SMV strains and isolates. Transmission of SMV through seed ranged from 0 to 43%, and isolate-by-soybean line interactions occurred in both transmission rates and percentages of mottled seeds. For example, SMV 746 was transmitted through 43% of seed in PI 229324, but was not transmitted through seed of PIs 68522, 68671, or 86449. In contrast, SMV 413 was transmitted through seed from all PIs. SMVs that were transmitted poorly by the Asian soybean aphid, Aphis glycines, also were transmitted poorly through seed. No predicted amino acid sequences within the helper-component protease or coat protein coding regions differentiated the two groups of SMV strains. The loss of aphid and seed transmissibility by repeated mechanical transmission suggests that constant selection pressure is needed to maintain the regions of the SMV genome controlling the two phenotypes from genetic drift and loss of function.

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