scholarly journals Mechanisms of Soybean Host-Plant Resistance Against Megacopta cribraria (Hemiptera: Plataspidae)

2020 ◽  
Vol 49 (4) ◽  
pp. 876-885
Author(s):  
S Lahiri ◽  
D D Reisig ◽  
Lisa L Dean ◽  
F P F Reay-Jones ◽  
J K Greene ◽  
...  
Keyword(s):  
Host Plant ◽  
Plant Resistance ◽  
Host Plant Resistance ◽  
Hexadecenoic Acid ◽  
Mechanisms Of Resistance ◽  
Useful Knowledge ◽  
Plant Volatile ◽  
Volatile Organic ◽  
Positive Correlations

Abstract A number of soybean varieties traditionally bred for resistance to various soybean arthropod pests have been identified as resistant to Megacopta cribraria (F.) (Hemiptera: Plataspidae). However, the mechanisms of host-plant resistance (HPR) in this system are not understood. The goal of this study was to identify the mechanisms of resistance by examining the role of plant volatile organic compounds (VOCs) and free amino acids (FAAs) among 16 soybean varieties. Choice and no-choice cage experiments identified several soybean varieties that demonstrated antixenosis as well as antibiosis. However, resistance varied over time in certain soybean varieties, such as N02-7002 and PI567352B. Mean nymph number from choice experiments had positive correlations with the FAAs asparagine, tryptophan, alanine, phenylanaline, and serine; negative correlation with leucine and threonine. Four plant volatiles, hexanal, 2-pentylfuran, beta-cyclocitral, and cis-9-hexadecenal, were positively correlated with subsequent nymph development, whereas n-hexadecenoic acid was negatively correlated with nymph number only, in adult choice cage experiments. This study contributes to understanding the mechanisms of HPR through associations with plant VOCs and FAAs in relation to M. cribraria development and provides useful knowledge for developing soybean varieties for M. cribraria management.

Role of Host-plant Resistance and Disease Development Stage on Leaf Photosynthetic Competence of Soybean Rust Infected Leaves

Crop Science ◽  
2010 ◽  
Vol 50 (6) ◽  
pp. 2533-2542 ◽  
Author(s):  
S. Kumudini ◽  
C. V. Godoy ◽  
B. Kennedy ◽  
E. Prior ◽  
J. Omielan ◽  
...  
Keyword(s):  
Host Plant ◽  
Plant Resistance ◽  
Host Plant Resistance ◽  
Development Stage ◽  
Soybean Rust ◽  
Disease Development

Soybean Host Plant Resistance to Megacopta cribraria (Hemiptera: Plataspidae) and the Potential Role of Leaf Trichome Density

2020 ◽  
Vol 49 (1) ◽  
pp. 88-97 ◽  
Author(s):  
S Lahiri ◽  
D D Reisig ◽  
F P F Reay-Jones ◽  
J K Greene ◽  
T E Carter ◽  
...  
Keyword(s):  
South Carolina ◽  
Host Plant ◽  
Plant Resistance ◽  
Host Plant Resistance ◽  
Current Trend ◽  
Field Resistance ◽  
Invasive Pest ◽  
Trichome Density ◽  
Significant Difference

Abstract Megacopta cribraria (F.) (Hemiptera: Plataspidae) is an invasive pest of soybean that has spread across the southeastern United States since its initial discovery in 2009 in Georgia. Previous studies in the southeastern states have documented both the population dynamics of this pest and host plant resistance (HPR) among soybean varieties, although the specific mechanisms of HPR remain unknown. The objectives of this study were, therefore, to 1) quantify field resistance to M. cribraria in multiple soybean varieties in two states previously affected by severe M. cribraria infestations, North Carolina (NC) and South Carolina (SC); and 2) study the role of soybean trichome density in imparting resistance against M. cribraria. Soybean variety ‘Camp’ was least attractive to M. cribraria, through time and locations, suggesting consistent resistance. Other varieties showed variable performance among the locations and sampling dates. A significant difference in trichome density was evident. However, there was no correlation between trichome density and M. cribraria infestation. Compared to a previously published study in the same location, when M. cribraria adults emerging from overwintering dispersed into soybeans, in our study only first-generation adults dispersed into soybeans. Considering the current trend of significantly lower M. cribraria infestation rates in North and South Carolina, this pest may be finally succumbing to indigenous natural enemies and should be managed by incorporating integrated pest management tactics, such as HPR, that help conserve natural enemy populations.

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