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Monitoring Bacterial Colonization and Maintenance on Arabidopsis thaliana Roots in a Floating Hydroponic System

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Published on: May 28, 2019

Fine-root system development and susceptibility to pathogen colonization.

Bryan Emmett¹, Eric B Nelson, Andre Kessler

¹Department of Horticulture, Cornell University, 134A Plant Science Building, Ithaca, NY, 14853, USA.

|October 31, 2013

Summary

This summary is machine-generated.

Apple replant disease (ARD) pathogens primarily infect fine root tips, leading to disease. Less susceptible rootstocks resist ARD by maintaining root growth and altering defense compounds in young roots.

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Published on: October 1, 2015

Area of Science:

Plant pathology
Horticultural science
Root biology

Background:

Soil-borne pathogens cause apple replant disease (ARD), impacting apple tree establishment and productivity.
Root development influences plant-pathogen interactions by controlling susceptible tissue availability.

Purpose of the Study:

To investigate the relationship between root architecture and resistance to ARD pathogens.
To compare pathogen colonization across root orders in susceptible and less susceptible apple rootstocks.

Main Methods:

A bioassay was conducted comparing pathogen abundance across root branching orders in two rootstock genotypes (M.26 and CG.210).
Root growth, anatomical development, and secondary metabolite production were assessed as resistance mechanisms.

Main Results:

ARD pathogens predominantly colonized first and second-order roots, correlating with tissue senescence in second and third-order roots.
Defense compound allocation varied across root orders, with induced defenses concentrated in first-order and pioneer roots.
The less susceptible rootstock (CG.210) exhibited lower pathogen loads and maintained higher root growth rates.

Conclusions:

Apple replant disease development is largely driven by the attrition of fine root tips.
Resistance in less susceptible rootstocks involves pathogen avoidance in distal roots and tolerance through sustained root growth.
Understanding root development is crucial for managing ARD and improving apple orchard establishment.