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

Resistance of Soybean Plant Introductions to Three Colonies of Soybean Aphid (Hemiptera: Aphididae) Biotype 4

2019 ◽  
Vol 112 (5) ◽  
pp. 2407-2417 ◽  
Author(s):  
Sophia R Conzemius ◽  
Louis S Hesler ◽  
Adam J Varenhorst ◽  
Kelley J Tilmon
Keyword(s):  
Yield Loss ◽  
Integrated Approach ◽  
Soybean Aphid ◽  
Soybean Plant ◽  
Soybean Aphids ◽  
Plant Introductions ◽  
Choice Tests ◽  
Separate Site ◽  
Management Approaches ◽  
Aphis Glycines Matsumura

Abstract Soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), infestations of soybean, Glycine max (L.) Merr. (Fabales: Fabaceae), and the associated yield loss have led to a large dependence on insecticidal management in soybean throughout the Midwestern United States. However, several populations of pyrethroid-resistant soybean aphids have recently been found in Iowa, Minnesota, North Dakota and South Dakota, which highlights the importance of alternative management approaches. One such alternative method is host-plant resistance, which uses naturally occurring plant defenses in crop cultivars to reduce the potential for yield loss from a pest population. Current soybean aphid-resistant cultivars do not protect against all soybean aphids due to the presence of virulent biotypes. In particular, soybean aphid biotype 4 is virulent to Rag1 and Rag2 resistance genes both individually and in combination. However, we hypothesized that resistance to biotype 4 may exist in previously identified, but uncharacterized resistant soybean plant introductions (PIs). To test this, we evaluated 51 previously identified but uncharacterized soybean aphid-resistant PIs for their resistance to colonies of soybean aphid biotype 4 collected in separate site-years (Lomira, WI 2013; Volga, SD 2015, 2016). Free-choice tests identified 14 PIs with putative resistance to ‘Lomira13’, two to ‘Volga15’, and eight to ‘Volga16’ soybean aphid colonies. Follow-up, no-choice tests corroborated two to three resistant PIs per colony, and PI 437696, which was resistant to each of the three colonies and could aid in breeding efforts and an integrated approach to soybean aphid management.

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

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.

Genetic Relationships among Soybean Plant Introductions with Resistance to Soybean Cyst Nematodes

Crop Science ◽  
1997 ◽  
Vol 37 (6) ◽  
pp. 1966-1972 ◽  
Author(s):  
B. W. Diers ◽  
H. T. Skorupska ◽  
A. P. Rao‐Arelli ◽  
S. R. Cianzio
Keyword(s):  
Genetic Relationships ◽  
Soybean Plant ◽  
Cyst Nematodes ◽  
Plant Introductions ◽  
Soybean Cyst Nematodes

Shattercane (Sorghum bicolor) Interference in Soybean (Glycine max)

Weed Science ◽  
1992 ◽  
Vol 40 (1) ◽  
pp. 68-73 ◽  
Author(s):  
Gary M. Fellows ◽  
Fred W. Roeth
Keyword(s):  
Glycine Max ◽  
Plant Height ◽  
Direct Relationship ◽  
Yield Loss ◽  
Economic Loss ◽  
Hyperbolic Function ◽  
Yield Reduction ◽  
Soybean Plant ◽  
Soybean Yield ◽  
Forage Sorghum

Shattercane interference in irrigated soybean was evaluated during 1987, 1988, and 1989 at Clay Center, NE, using ‘Rox’ forage sorghum to simulate shattercane. Soybean yield reduction did not occur if shattercane was removed by 2 wk after emergence in 1987 and 6 wk after emergence in 1988 and 1989. Shattercane interference with soybean began when shattercane height exceeded soybean height. Soybean yield was reduced up to 25% before the height differential reached 30 cm, the minimum difference required for selectively applying glyphosate with a wiper applicator. Soybean nodes per stem, pods per stem, and beans per pod decreased as duration of interference increased. A direct relationship between soybean yield loss and shattercane density fit a rectangular hyperbolic function. Yield loss per shattercane plant was highest at low shattercane densities. Soybean plant height, biomass, nodes per stem, pods per stem, pods per node, and beans per pod decreased as shattercane density increased. An interference model for estimation of soybean yield and economic loss based on shattercane density was developed.

scholarly journals Reaction of Selected Soybean Genotypes to Isolates of Fusarium solani f. sp. glycines and Their Culture Filtrates

Plant Disease ◽  
1998 ◽  
Vol 82 (9) ◽  
pp. 999-1002 ◽  
Author(s):  
Y. H. Huang ◽  
G. L. Hartman
Keyword(s):  
Great Lakes ◽  
Disease Severity ◽  
Culture Filtrate ◽  
Fusarium Solani ◽  
Stem Length ◽  
Soybean Plant ◽  
Foliar Disease ◽  
Plant Introductions ◽  
Disease Progress ◽  
Progress Curve

Four soybean plant introductions, PI 520.733, PI 567.374, PI 567.650B, and PI 567.659, and one soybean cultivar, Great Lakes 3202, were inoculated under greenhouse conditions with four isolates of Fusarium solani f. sp. glycines. Foliar disease severity rating was greatest on PI 567.659, followed by Great Lakes 3202, PI 520.733, PI 567.650B, and PI 567.374. There was no significant interaction between isolates and soybean entries for foliar disease severity ratings. Experiments also were conducted to determine if disease development and root colonization differed among entries. Root infection of the five entries did not differ (P = 0.05). Foliar disease progress curves increased faster for PI 567.659 and Great Lakes 3202 than for PI 567.374. The area under the disease progress curve (AUDPC) value for PI 567.374 was the lowest and differed (P = 0.01) from AUDPC values for Great Lakes 3202 and PI 567.659. There were no differences (P = 0.01) in length of taproot lesions, losses in root dry weight, and vascular stem length discoloration among the entries, and there was no correlation (P = 0.05) between these measurements and foliar AUDPC values. Cut seedling stems immersed in culture filtrate developed interveinal chlorosis on leaves of each entry within 2 days. Disease severity on cut seedlings of PI 567.374 was lower (P = 0.01) than on the other entries. There was a positive correlation (r = 0.94, P = 0.05) between AUDPC values of the five entries inoculated with the fungus and the cut seedling test using culture filtrate.

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