American Potato Journal

, Volume 61, Issue 9, pp 557–568 | Cite as

Root deterioration in the potato early dying syndrome: Causes and effects of root biomass reductions associated with colonization byVerticillium dahliae

  • J. B. Kotcon
  • D. I. Rouse


Russet Burbank potatoes were grown in the greenhouse in a split-root culture system to assess the impact of pathogens associated with the Potato Early Dying Syndrome (PED) on root deterioration. Plants were grown with all, half, or none of the root system in steamed soil infested withVerticillium dahliae, or in field soil infested withV. dahliae and other PED pathogens. The direct impact of pathogens on root deterioration versus indirect effects resulting from premature senescence of the whole plant was evaluated. Root biomass did not differ significantly between root halves from the same plant in infested and uninfested soil. Root biomass from plants with both halves of the root system in uninfested soil was usually greater than from plants with one or both halves growing in infested soil. Root biomass decreased rapidly after plant stems were inoculated with conidial suspensions ofV. dahliae. Root deterioration in PED was associated with premature senescence of foliar tissue and occurred independently of root colonization by root-colonizing pathogens.

Key Words

Root growth root deterioration potato early dying root colonization Verticillium dahliae Pratylenchus penetrans Colletotrichum coccodes Fusarium spp. soil-borne diseases 


Papas del cultivar Russet Burbank fueron sembradas en el invernadero en un sistema de cultivo de raíces divididas con al propósito de determinar el impacto de patógenos asociados al síndrome de muerte temprana (PED) en el deterioro de raíces. Las plantas crecieron con todo, la mitad y nada de su sistema radicular en un suelo esterilizado e inoculado conVerticillium dahliae ó en suelo de campo infestado conV. dahliae y otros patógenos que causan muerte temprana en papa (PED) el impacto directo de los patógenos en el deterioro de las raíces versus los efectos indirectos resultantes de una senescencia prematura en toda la planta fueron evaluados. La biomasa de raíces no definió significativamente entre mitades de raíces de una misma planta en suelo infestado y no-infestado. La biomasa de raíces de plantas con ambas mitades de su sistema radicular en suelo no-infestado fue generalmente mayor que aquella de plantas con una ó ambas mitades creciendo en suelo infestado. La biomasa de raices decreció rápidamente luego que los tallos de las plantas fueron inoculados con una suspensión de conidias deV. dahliae. El deterioro de raíces en PED fue asociado con senescencia prematura del follaje y ocurrió independientemente de la colonización de las raíces por patógenos colonizadores de raices.


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Copyright information

© 1984 1984

Authors and Affiliations

  • J. B. Kotcon
    • 1
  • D. I. Rouse
    • 1
  1. 1.Department of Plant PathologyUniversity of Wisconsin-MadisonMadison

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