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Plant Pathology Journal
  Year: 2005 | Volume: 4 | Issue: 2 | Page No.: 113-121
DOI: 10.3923/ppj.2005.113.121
Soil Water Pressure Affects Population Dynamics of Biocontrol Agents of Verticillium dahliae, the Cause of Potato Early Dying
Shaukat Hussain, Mary Powelson, Neil Christensen and S. Jawad Ahmad Shah

Abstract:
Studies were conducted to determine the effect of different osmotic potentials on time required for 95% spore germination, mycelial growth and sporulation of Verticillium dahliae and its four known biocontrol agents. Time for 95% spore germination increased as osmotic potential of the medium decreased from -0.12 to -8.13 MPa and ranged from 8-29, 16-72, 16-46 and 13-60 h for Fusarium equiseti, Gliocladium virens, Trichoderma viride and Verticillium dahliae. Ascospores of Talaromyces flavus did not obtain 95% germination even after heat treatment at 70°C for one hour. Mycelial growth decreased as osmotic potential of the medium decreased. In a greenhouse study F. equiseti reduced colonization of roots by V. dahliae and increased foliar dry weight. Gliocladium virens, on the other hand, did not have an effect on colonization of roots by V. dahliae, it did increase both foliar dry weight and log root/shoot ratio. Fresh root weight, root/shoot ratio and colonization of roots by G. virens was greater at -0.15 than at -0.03 MPa whereas infection of roots by V. dahliae was reduced at -0.03 MPa. Population density of F. equiseti on roots was not affected by soil water pressure.
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How to cite this article:

Shaukat Hussain, Mary Powelson, Neil Christensen and S. Jawad Ahmad Shah, 2005. Soil Water Pressure Affects Population Dynamics of Biocontrol Agents of Verticillium dahliae, the Cause of Potato Early Dying. Plant Pathology Journal, 4: 113-121.

DOI: 10.3923/ppj.2005.113.121

URL: https://scialert.net/abstract/?doi=ppj.2005.113.121

 
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