Investigating the Impact of Tillage and Crop Rotation on the Prevalence of phlD-Carrying Pseudomonas Potentially Involved in Disease Suppression

Author:

Rathore Ridhdhi12,Forristal Dermot2,Spink John2,Dowling David1,Germaine Kieran J.1ORCID

Affiliation:

1. EnviroCore, Dargan Research Centre, South East Technological University (SETU), R93 V960 Carlow, Ireland

2. Teagasc Agriculture and Food Development Authority, Oak Park Research Centre, R93 XE12 Carlow, Ireland

Abstract

Winter oilseed rape (OSR) is becoming an increasingly popular crop in rotations as it provides a cash crop and reduces the incidence of take-all fungal disease (caused by Gaeumannomyces graminis) in subsequent wheat production. The exact mechanism of this inhibition of fungal pathogens is not fully understood; however, the selective recruitment of bacterial groups with the ability to suppress pathogen growth and reproduction is thought to play a role. Here we examine the effect of tillage practice on the proliferation of microbes that possess the phlD gene involved in the production of the antifungal compound 2,4-diacetylphloroglucinol (2,4-DAPG), in the rhizospheres of both winter oilseed rape and winter wheat grown in rotation over a two-year period. The results showed that conservation strip tillage led to a significantly greater phlD gene copy number, both in the soil and in the roots, of oilseed rape and wheat crops, whereas crop rotation of oilseed rape and wheat did not increase the phlD gene copy number in winter wheat.

Funder

Teagasc Walsh Fellowship Scheme

Publisher

MDPI AG

Subject

Virology,Microbiology (medical),Microbiology

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