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Variation patterns within 153 flax (Linum usitatissimum L.) genebank accessions based on evaluation for resistance to fusarium wilt, anthracnose and pasmo

Published online by Cambridge University Press:  01 April 2008

Axel Diederichsen ,
Tatiana A. Rozhmina  and
Ljudmilla P. Kudrjavceva
Axel Diederichsen*
Affiliation:
Plant Gene Resources of Canada (PGRC), Saskatoon Research Centre, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, Saskatchewan, CanadaS7N 0X2
Tatiana A. Rozhmina
Affiliation:
All-Russian Flax Research Institute (VNIIL), Lunacharsky Str. 35, Torzhok 172060, Tver District, Russian Federation
Ljudmilla P. Kudrjavceva
Affiliation:
All-Russian Flax Research Institute (VNIIL), Lunacharsky Str. 35, Torzhok 172060, Tver District, Russian Federation
*
*Corresponding author. E-mail: diederichsena@agr.gc.ca
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Abstract

Germplasm of 153 flax (Linum usitatissimum) accessions from 24 countries held at Plant Gene Resources of Canada (PGRC) was evaluated for resistance to fusarium wilt (Fusarium oxysporum), anthracnose (Colletotrichum lini) and pasmo (Septoria linicola). The screening was conducted at the All-Russian Flax Research Institute (VNIIL) at Torzhok, Russia, over 3 years for fusarium wilt and anthracnose, and over 2 years for pasmo. A disease severity index ranging from 0% (no infection) to 100% (heavy infection) was calculated based on observations after artificial inoculation with the pathogens in the greenhouse (fusarium wilt) or in field nurseries (anthracnose and pasmo). The average disease severity index for fusarium wilt was 56.6 ± 34.4% (range 0–100.0%), for anthracnose 59.8 ± 8.1% (range 43.8–83.9%) and for pasmo 74.2 ± 11.8% (range 27.3–100.0%). The variation of disease severity indices among the years and within each accession was highest for fusarium wilt. Higher than average resistance for all three diseases was found in accessions from East Asia, while germplasm from the Indian subcontinent showed considerably lower than average resistance. Germplasm from North America and South America (mostly linseed) displayed above average resistance to fusarium wilt, while European accessions (mostly fibre flax) showed lower than average resistance to this disease. The different resistance levels reflected the improvements made by plant breeding and differences in the environments under which the germplasm accessions evolved. Accessions with potential use in linseed and fibre flax breeding were identified.

Keywords

disease resistancefibre flaxgenetic resourcesgermplasm screeninglinseedLinum usitatissimum L.
Type
Research Article
Information
Plant Genetic Resources , Volume 6 , Issue 1 , April 2008 , pp. 22 - 32
Copyright
Copyright © NIAB 2008

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