Loading…
The influence of growth stage of different cereal species on host susceptibility to Gaeumannomyces graminis var. tritici and on Pseudomonas populations in the rhizosphere
The dynamics of infection by Gaeumannomyces graminis var. tritici ( Ggt ), the soil-borne fungus causing the disease take-all, in wheat ( Triticum aestivum L.), rye ( Secale cereale L.), barley ( Hordeum vulgare L.) and triticale (x Triticosecale Wittmack) was investigated at different growth stages...
Saved in:
Published in: | Australasian plant pathology 2015-01, Vol.44 (1), p.57-70 |
---|---|
Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | The dynamics of infection by
Gaeumannomyces graminis
var.
tritici
(
Ggt
), the soil-borne fungus causing the disease take-all, in wheat (
Triticum aestivum
L.), rye (
Secale cereale
L.), barley (
Hordeum vulgare
L.) and triticale (x
Triticosecale
Wittmack) was investigated at different growth stages of the cereal hosts. In the field,
Ggt
spreads along rows of plants from the inoculum sources. At harvest,
Ggt
DNA was detected up to 60 cm away from inoculum sources in all species except rye, although most of the take-all lesions occurred in roots less than 30 cm away in all species, with rye being the least affected. The greatest populations of fluorescent
Pseudomonas
sp-species were extracted from the rhizosphere of cereal roots sampled near the points of
Ggt
inoculation; were found prior to the booting growth stage in triticale and rye; and were not related to the concentration of
Ggt
in the roots. In pots in a glasshouse experiment,
Ggt
colonised seedling wheat roots to a concentration of 103 ng DNA/mg dried roots and caused 14 % take-all severity in roots during plant development. In rye, seedling roots contained
Ggt
DNA at 15 ng/mg dried root, which decreased to negligible concentrations until heading, then increased rapidly to 280 ng DNA/mg dried root at kernel development. Take-all root severity in rye increased from 1 to 50 % over that period. In a second glasshouse experiment, inoculation of roots of host plants at various growth stages with actively growing hyphae of
Ggt
showed that the pathogen was able to overcome resistance in rye plants after an establishment phase. |
---|---|
ISSN: | 0815-3191 1448-6032 |
DOI: | 10.1007/s13313-014-0324-5 |