"DEFEATED" Rps1 GENE IN SOYBEAN

1988 ◽  
Vol 68 (1) ◽  
pp. 225-227
Author(s):  
T.R. ANDERSON ◽  
R.I. BUZZELL
Keyword(s):  
Glycine Max ◽  
Specific Resistance ◽  
Field Testing ◽  
Residual Effects ◽  
Phytophthora Megasperma ◽  
Glycine Max L ◽  
Phytophthora Rot

Field testing of 10 backcross-derived Rps1Rps1 cultivars/lines of soybean (Glycine max (L.) Merr.) and their recurrent rps1rps1 cultivars in the presence of compatible races of Phytophthora megasperma f. sp. glycinea showed no residual effects of race-specific resistance on tolerance of soybean to the disease.Key words: Soybean, race-specific resistance, tolerance, phytophthora rot

Penetration and growth of compatible and incompatible races of Phytophthora megasperma var. sojae in soybean hypocotyl tissues differing in age

1980 ◽  
Vol 58 (24) ◽  
pp. 2594-2601 ◽  
Author(s):  
P. Stössel ◽  
G. Lazarovits ◽  
E. W. B. Ward
Keyword(s):  
Glycine Max ◽  
Epidermal Cells ◽  
Mechanisms Of Resistance ◽  
Hypocotyl Growth ◽  
Phytophthora Megasperma ◽  
Cell Layers ◽  
Glycine Max L ◽  
Incompatible Reaction ◽  
Race 4 ◽  
Incompatible Interactions

Intact 6-day old soybean hypocotyls (Glycine max L., cv. Altona) were inoculated with zoospores of Phytophthora megasperma Drechs. var. sojae Hildeb. either at the top (susceptible to compatible races, resistant to incompatible races) or the bottom (resistant to both compatible and incompatible races) and, after a 22-h incubation, were examined by light microscopy. Penetration at the top and bottom by both compatible (race 6) and incompatible (race 4) P. megasperma var. sojae was predominantly between anticlinal walls of epidermal cells. Both races, but especially race 4, also penetrated directly into the outer walls of epidermal cells, but epidermal cells rarely were invaded. Both races grew mainly intercellularly, but race 6 produced haustoria more frequently than race 4. Race 6 haustoria at the top of the hypocotyl were usually encased, those of race 4 were not. Growth of both races was equally dense in the first few cell layers, but the numbers of race 4 hyphae decreased rapidly while those of race 6 became more abundant in the deeper layers. With race 4, but not with race 6, most cells in the infected tissue were necrotic. Differences between the compatible and the incompatible interactions were not absolute; there were many unsuccessful invasion attempts by race 6 and individual hyphae of race 4 spread deeply into the tissue. At the bottom of the hypocotyl, growth of both races was more restricted. Race 6 produced fewer haustoria than at the top, and similarities to the incompatible reaction with race 4 at the top suggest that similar mechanisms of resistance may be involved.

OAC Musca soybean

1991 ◽  
Vol 71 (2) ◽  
pp. 497-498 ◽  
Author(s):  
W. D. Beversdorf ◽  
D. J. Hume ◽  
P. Gostovic ◽  
J. C. Muscat ◽  
S. Pararajasingham
Keyword(s):  
Glycine Max ◽  
Key Words ◽  
Soybean Cultivar ◽  
Clay Soils ◽  
Phytophthora Megasperma ◽  
Low Field ◽  
Glycine Max L ◽  
Cultivar Description

OAC Musca is a soybean (Glycine max (L.) Merr.) cultivar which is 3 d earlier than Hodgson and 2% higher in yield in Ontario trials. It has exhibited low field losses to Phytophthora megasperma f. sp. glycinea in Ontario testing, is a tall cultivar and is intended for use on clay soils. Key words: Soybean, cultivar description

Identification and Utilization of Variation in Herbicide Tolerance in Soybean (Glycine max) Breeding

Weed Science ◽  
1987 ◽  
Vol 35 (S1) ◽  
pp. 4-8 ◽  
Author(s):  
Edgar E. Hartwig
Keyword(s):  
Glycine Max ◽  
Herbicide Tolerance ◽  
Growing Season ◽  
Eastern Asia ◽  
Phytophthora Megasperma ◽  
Breeding Lines ◽  
Yield Variation ◽  
Phytophthora Rot ◽  
High Level ◽  
Over The Top

Herbicides marketed for selected crops were chosen on the basis that major cultivars of the specific crop were tolerant. Our work with soybeans [Glycine max(L.) Merr.] has demonstrated that variability exists with regard to sensitivity or tolerance to several herbicides. As a part of our breeding program to develop improved soybean cultivars, we have evaluated advanced breeding lines and germplasm for reaction to herbicides on the market as well as experimental herbicides. A breeding line was identified and released for production which showed very little injury from two over-the-top applications of a double rate of 2,4-DB [4-(2,4-dichlorophenoxy)butyric acid]. Other strains showed severe injury and depressed seed yield. Variation in reaction to glyphosate [N-(phosphonomethyl)glycine] has been observed. Lines tolerant to 0.56 kg ai/ha in one growing season were severely damaged the following season. When 200 germplasm lines from eastern Asia were treated with glyphosate, 6% showed less than 15% injury while 21% showed over 80% injury. The cultivar ‘Tracy′, selected for tolerance to 2,4-DB and a high level of resistance to the soil-borne disease causing phytophthora rot, was found to be sensitive to metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one]. Tracy has two major genes controlling resistance to phytophthora rot caused byPhytophthora megaspermaDrechs. f. sp.glycineaKuan and Erwin. One of these genes is closely linked with a gene controlling reaction to metribuzin. A crossover type was identified. The cultivar ‘Tracy-M’ retains the high level of resistance to phytophthora rot and is tolerant to metribuzin. A small percentage of germplasm lines evaluated were found to be sensitive to bentazon. Reaction to bentazon [3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] is simply inherited.

RCAT Persian soybean

1991 ◽  
Vol 71 (1) ◽  
pp. 175-176
Author(s):  
G. R. Ablett ◽  
W. D. Beversdorf
Keyword(s):  
Glycine Max ◽  
Root Rot ◽  
Yield Potential ◽  
Maturity Group ◽  
Phytophthora Megasperma ◽  
Phytophthora Root Rot ◽  
Group I ◽  
Glycine Max L ◽  
Cultivar Description ◽  
Late Maturity

RCAT Persian is a mid-late Maturity Group I soybean [Glycine max L. (Merr.)] cultivar with excellent yield potential, good lodging tolerance and resistance to most races of phytophthora root rot caused by Phytophthora megasperma f. sp. glycinea (Pmg) found in Ontario. Key words: Soybean, cultivar description

KG 41 SOYBEAN

1990 ◽  
Vol 70 (2) ◽  
pp. 537-538
Author(s):  
N. R. BRADNER ◽  
R. D. SIMPSON ◽  
A. A. HADLOCK
Keyword(s):  
Glycine Max ◽  
Maturity Group ◽  
Lodging Resistance ◽  
Yield Performance ◽  
Glycine Max L ◽  
Phytophthora Rot

KG 41 is a Maturity Group 00 soybean (Glycine max (L.) Merr.) cultivar which is 2 d earlier and higher yielding than the cultivar Bicentennial. Its main advantages are its yield performance, lodging resistance and phytophthora rot tolerance.Key words: Glycine max, KG 41 cultivar, soybean

Evaluation of four Japanese soybean cultivars for Rps alleles conferring resistance to Phytophthora megasperma f. sp. glycinea

1992 ◽  
Vol 72 (1) ◽  
pp. 217-220 ◽  
Author(s):  
B. D. Rennie ◽  
V. D. Beversdorf ◽  
R. I. Buzzell ◽  
T. R. Anderson
Keyword(s):  
Glycine Max ◽  
Key Words ◽  
Phytophthora Megasperma ◽  
Soybean Cultivars ◽  
Glycine Max L ◽  
Phytophthora Resistance

Four Japanese soybean (Glycine max (L) Merr.) cultivars (Fujiotome (PI 360836), Misaodaizu (PI 360839), Nezumisaya (PI 360841) and Honiku 65 (PI 360837)) were evaluated for Rps alleles conferring resistance for Phytophthora megasperma (Drechs.) f. sp. glycinea (Hildeb.) Kuan & Erwin. Fujiotome contains Rps1-a and Rps5; Misaodaizu contains Rsp1-c and Rps3; and Nezumisaya contains Rps1-b and a new allele, designated Rps? (Nezumisaya). Honiku 65 is susceptible but two variants obtained from it each contain a new Rps allele designated Rps? (OX939) and Rps? (OX940).Key words: Soybean, Phytophthora resistance

RCAT ALLIANCE SOYBEAN

1990 ◽  
Vol 70 (3) ◽  
pp. 855-856
Author(s):  
G. R. ABLETT ◽  
W. D. BEVERSDORF
Keyword(s):  
Glycine Max ◽  
Soybean Cultivar ◽  
Maturity Group ◽  
Phytophthora Megasperma ◽  
Group I ◽  
Glycine Max L ◽  
Cultivar Description ◽  
Late Maturity

RCAT Alliance is a late Maturity Group I soybean [Glycine max L. (Merr.)] cultivar which carries the Rps1-c gene for resistance to the major races of Phytophthora megasperma f. sp. glycinea in Ontario.Key words: Soybean, cultivar description

KG 100 SOYBEAN

1989 ◽  
Vol 69 (4) ◽  
pp. 1271-1272
Author(s):  
N. R. BRADNER ◽  
R. D. SIMPSON ◽  
A. A. HADLOCK
Keyword(s):  
Glycine Max ◽  
Maturity Group ◽  
Yield Performance ◽  
Glycine Max L ◽  
Group Ii ◽  
Phytophthora Rot

KG 100 is a Maturity Group II soybean (Glycine max (L.) Merr.) cultivar which is 2 d later and higher yielding than the cultivar Jacques 103. Its main advantage is its yield performance and excellent phytophthora rot tolerance.Key words: Glycine max, KG 100 cultivar, soybean

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