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Green Stem Disorder of Soybean.

H A Hobbs1, C B Hill1, C R Grau2

  • 1Department of Crop Sciences, University of Illinois, Urbana 61801.

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Green stem disorder in soybean is not caused by Bean pod mottle virus (BPMV). Research found no link between BPMV infection and green stem disorder, indicating the cause remains unknown.

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Area of Science:

  • Plant Pathology
  • Agronomy
  • Molecular Biology

Background:

  • Green stem disorder (GSD) in soybean (Glycine max) is a condition marked by delayed stem senescence, occurring alongside normal pod ripening and seed maturation.
  • Understanding the etiology of GSD is crucial for soybean production, as it impacts crop quality and yield.

Purpose of the Study:

  • To investigate the relationship between Green Stem Disorder (GSD) in soybean and Bean Pod Mottle Virus (BPMV).
  • To explore other potential factors contributing to GSD development in soybean.

Main Methods:

  • Field surveys across multiple seasons to correlate GSD incidence with BPMV infection (detected via ELISA) at growth stage R6.
  • Comparative analysis of GSD incidence in soybean entries across locations with varying natural virus infection levels.
  • Controlled field cage experiments to assess GSD development with and without BPMV infection, and in response to insect feeding.

Main Results:

  • A chi-square test revealed no statistical independence between BPMV infection and GSD at growth stage R6 (P = 0.98).
  • GSD incidence was similar across different locations despite variations in BPMV infection rates.
  • GSD developed in field cages without BPMV infection, and BPMV presence did not increase GSD incidence.

Conclusions:

  • Bean Pod Mottle Virus (BPMV) is not a causative agent of Green Stem Disorder (GSD) in soybean.
  • The underlying cause of Green Stem Disorder in soybean remains undetermined, warranting further investigation into other potential factors.