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. 2013;8(3):e58040.
doi: 10.1371/journal.pone.0058040. Epub 2013 Mar 11.

A novel and major quantitative trait locus for fusarium crown rot resistance in a genotype of Wild Barley (Hordeum spontaneum L.)

Guangdeng Chen  1 , Yaxi Liu, Jun Ma, Zhi Zheng, Yuming Wei, C Lynne McIntyre, You-Liang Zheng, Chunji Liu
Affiliations

A novel and major quantitative trait locus for fusarium crown rot resistance in a genotype of Wild Barley (Hordeum spontaneum L.)

Guangdeng Chen et al. PLoS One. 2013.

Abstract

Fusarium crown rot (FCR), caused by various Fusarium species, is a destructive disease of cereal crops in semiarid regions worldwide. As part of our contribution to the development of Fusarium resistant cultivars, we identified several novel sources of resistance by systematically assessing barley genotypes representing different geographical origins and plant types. One of these sources of resistance was investigated in this study by generating and analysing two populations of recombinant inbred lines. A major locus conferring FCR resistance, designated as Qcrs.cpi-4H, was detected in one of the populations (mapping population) and the effects of the QTL was confirmed in the other population. The QTL was mapped to the distal end of chromosome arm 4HL and it is effective against both of the Fusarium isolates tested, one F. pseudograminearum and the other F. graminearum. The QTL explains up to 45.3% of the phenotypic variance. As distinct from an earlier report which demonstrated co-locations of loci conferring FCR resistance and plant height in barley, a correlation between these two traits was not detected in the mapping population. However, as observed in a screen of random genotypes, an association between FCR resistance and plant growth rate was detected and a QTL controlling the latter was detected near the Qcrs.cpi-4H locus in the mapping population. Existing data indicate that, although growth rate may affect FCR resistance, different genes at this locus are likely involved in controlling these two traits.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist

Figures

Figure 1
Figure 1. Difference in resistance to Fusarium crown rot between Baudin (P1) and AWCS276 (P2) detected with an isolate of F. pseudograminearum (CS3096).
The photo was taken 21 days post inoculation.
Figure 2
Figure 2. QTL conferring FCR resistance detected in the population of Baudin/AWCS276 using an isolate of F. pseudograminearum (CS3096).
Marker positions are shown to the left of the linkage map and distances in centiMorgan (cM) between loci are shown to the right. The vertical dotted line indicates the significance threshold of LOD 3.0.
Figure 3
Figure 3. QTL conferring FCR resistance detected in the population of Baudin/AWCS276 using an isolate of F. graminearum (CS3005).
Marker positions are shown to the left of the linkage map and distances in centiMorgan (cM) between loci are shown to the right. The vertical dotted line indicates the significance threshold of LOD 3.0.
Figure 4
Figure 4. Distributions and medium of Fusarium crown rot disease index among genotypes in each of the two groups with different growth rates.
See this image and copyright information in PMC

References

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