Abstract Detail

Host/Plant Pathogen Interactions and Plant Health Management

Xi, Kequan [1], Turkington, T. Kelly [2], Capettini, Flavio [3], Juskiw, Patricia [4], Nyachiro, Joseph [3].

Genotype and Environment Interactions for Barley Scald Resistance.

Broad sense heritability of resistance to scald (Rhynchosporium secalis) of barley was estimated based on the ratio of genotypic variance over the total variance using transformed scald ratings from a variety of field trials across central Alberta. Field trials included advanced yield tests, scald differential, representative cultivar tests and scald screening trials from 2012 to 2014. Scald severity was assessed based on a 0-9 scale. The rating scores were transformed using a Horsfall Barrett scale and followed by an arcsine transformation for data analyses. The majority of phenotypic variation in scald resistance was accounted by genotypic variance and heritability estimates for this trait ranged from 0.60 to 0.88 in eight of ten field trails analyzed. No heritability was estimated for the remaining two yield trials due to the non-significant effect of scald reactions following data analysis using ANOVA. Scald reactions in the differentials and representative cultivars in multiple locations were visualized based on a GGE plot analysis. While a cluster consisting of several differentials with major resistance genes was consistently observed, some of the resistant cultivars such as Seebe, Manny and Sundre, were distributed differently between the 2013 and 2014 plots. Furthermore, there were significant genotype and environment interactions in the majority of tests using ANOVA. This suggested that environment and pathogen effects played a role in causing variability of barley scald reactions.

Related Links:
heribility of barley scald resistance

1 - Alberta Agriculture, Field Crop Development Centre, 6000 C and E Trail, Lacombe, AB, T4L 1W1, Canada
2 - Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C and E Trail, Lacombe, AB, T4L 1W1, Canada
3 - Alberta Agriculture, Field Crop Development Centre, 5030-50 Street, Lacombe, AB, T4L 1W8, Canada
4 - Field Crop Development Centre, Alberta Agriculture and Rural Development, 5030 50th Street, Lacombe, AB, T4L 1W8, Canada

Keywords:
barley
scald
heritability.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PPA015
Abstract ID:1133
Candidate for Awards:None