Alleles at a quantitative trait locus for stem solidness in wheat affect temporal patterns of pith expression and level of resistance to the wheat stem sawfly
The stem solidness trait in wheat has been the most effective mechanism for management of the wheat stem sawfly (WSS) for six decades. However, recent results have shown that in certain genotypes, the degree of stem solidness is not a useful indicator of WSS resistance. A morphological characterizat...
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Published in | Plant breeding Vol. 135; no. 5; pp. 546 - 551 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin
Blackwell Publishing Ltd
01.10.2016
Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | The stem solidness trait in wheat has been the most effective mechanism for management of the wheat stem sawfly (WSS) for six decades. However, recent results have shown that in certain genotypes, the degree of stem solidness is not a useful indicator of WSS resistance. A morphological characterization of solidness expression indicated that in the genotype ‘Conan’, very solid pith undergoes rapid retraction during stem maturation, resulting in significantly less solidness at maturity. In other solid‐stemmed genotypes, including the standard WSS‐resistant cultivar ‘Choteau’, dense pith in the stem remains nearly unchanged throughout plant development. In cage trials, ‘Conan’ plants were less preferred for oviposition by the WSS when paired with ‘Choteau’ plants. Field bioassays using near‐isogenic lines differing for alleles at Qss.msub‐3BL showed that the Conan allele provides higher levels of early stem solidness and rapid pith retraction during stem maturation. These results suggest that the traditional approach for increasing WSS resistance by selecting for increasing stem solidness needs to be modified to consider temporal variations in pith expression associated with alleles at Qss.msub‐3BL. |
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Bibliography: | ark:/67375/WNG-5CKXTG6Z-Z USDA National Institute of Food and Agriculture - No. 2011-68002-30029; No. 2013-67013-21106 Montana Wheat and Barley Committee Montana Board of Research and Commercialization Technology Project 06-07 ArticleID:PBR12398 Table S1. Slope ± SE and intercept ± SE of regression lines modeling temporal patterns of pith expression in genotypes expressing different levels of stem solidness. Data averaged over replications and years. Table S2. Mixed model analysis and mean ± SE for pith moisture and stem density of wheat genotypes expressing different levels of stem solidness. Data averaged over replications. Table S3. Slope ± SE and intercept ± SE of regression lines modeling temporal patterns of pith moisture and stem density in genotypes expressing different levels of stem solidness. Table S4. Slope ± SE and intercept ± SE of regression lines modeling temporal patterns of pith expression in NILs derived from three different genetic backgrounds along with parental lines. Data averaged over replications and years. istex:36FC03F314D0BB2AA0EBE9BD2DBF4DABE4EB90A2 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0179-9541 1439-0523 |
DOI: | 10.1111/pbr.12398 |