Disease‐ and Performance‐Related Traits of Ethylene‐Insensitive Soybean

Ethylene controls many beneficial responses in plants but also promotes chlorosis, senescence, disease, and fruit over‐ripening. The present study compared previously isolated ethylene‐insensitive lines of soybean [Glycine max (L.) Merr.] to their isogenic, ethylene‐sensitive parent with respect to...

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Bibliographic Details
Published in:Crop science 2006-03, Vol.46 (2), p.893-901
Main Authors: Bent, Andrew F., Hoffman, Thomas K., Schmidt, J. Scott, Hartman, Glen L., Hoffman, David D., Xue, Ping, Tucker, Mark L.
Format: Article
Language:English
Subjects:
Abscission
Agronomy. Soil science and plant productions
Biological and medical sciences
Crop diseases
Crop yield
Data analysis
Disease resistance
Ethylene
Flowers & plants
Fundamental and applied biological sciences. Psychology
Genetics and breeding of economic plants
Glycine max
Laboratory tests
Leaves
Nematoda
Pathogens
Plant hormones
Sclerotinia sclerotiorum
Septoria
Soybean
Soybeans
Studies
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Summary:Ethylene controls many beneficial responses in plants but also promotes chlorosis, senescence, disease, and fruit over‐ripening. The present study compared previously isolated ethylene‐insensitive lines of soybean [Glycine max (L.) Merr.] to their isogenic, ethylene‐sensitive parent with respect to disease resistance, seed yield, and other field performance traits. In laboratory tests, ethylene insensitivity reduced root colonization by soybean cyst nematode. Using healthy young plants, ethylene‐insensitivity also reduced ethylene‐activated leaf chlorosis and abscission. However, in the field, leaf chlorophyll and late‐season senescence were not altered, suggesting that ethylene is not a main determinant of late‐season senescence of soybean leaves. Field studies also revealed no changes in susceptibility to Septoria brown spot disease (caused by Septoria glycines Hemmi), flowering date, plant height, or seed total protein and oil concentration. Field studies did demonstrate elevated susceptibility to white mold disease [Sclerotinia sclerotiorum (Lib.) deBary], poor stand establishment in some but not all environments, altered plant architecture, and earlier maturity date in the ethylene‐insensitive lines. Seed yield was notably undependable, being similar to the parental line in some field locations but significantly reduced in most environments. To avoid these negative impacts on overall performance, manipulation of plant ethylene responses should be targeted to specific tissues, growth stages, or growth environments.
ISSN:0011-183X
1435-0653
DOI:10.2135/cropsci2005.08-0235