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Title: Resistance to an eriophyid mite in an interspecific hybrid pedigree of Populus

Abstract

Schizoempodium mesophyllincola is an eriophyid mite that feeds in leaves of Populus trichocarpa in the central part of this cottonwood tree’s range (i.e., coastal British Columbia, Washington and Oregon) in the Pacific Northwest (PNW) of North America, and on some interspecific hybrids planted in short-rotation, intensive forestry in the region. The mite, a leaf vagrant, sucks the contents of spongy mesophyll cells, causing leaf discoloration, or “bronzing.” Here, we investigate the inheritance pattern of resistance to leaf bronzing using a three-generation Populus trichocarpa x P. deltoides hybrid pedigree. We found that resistance to the mite is an exaptation in that its source in two related F2 families of the TxD hybrid pedigree was the non-native host, P. deltoides. Two grandparental genotypes of the latter, ‘ILL-5’ and ‘ILL-129’, were completely free of the bronzing symptom and that phenotype was inherited in a Mendelian manner in the F1 and F2. Resistance to S. mesophyllincola is similar to resistance to many other regional pathogens of P. trichocarpa (e.g., Melampsora occidentalis, Venturia inopina, Sphaerulina populicola, and Taphrina sp.) in that it is inherited from the non-native grandparent (e.g., P. deltoides, P. nigra, or P. maximowiczii) in three-generation, hybrid pedigrees. In addition to finding evidencemore » for Mendelian inheritance, we found two QTLs with LOD scores 5.03 and 3.12 mapped on linkage groups (LG) III and I, and they explained 6.7 and 4.2% of the phenotypic variance, respectively. The LG I QTL is close to, or synonymous with, one for resistance to sap-feeding arthropods and leaf developmental traits as expressed in a British study utilizing the same pedigree.« less

Authors:
 [1]; ORCiD logo [2];  [3]
  1. Univ. of Idaho, Moscow, ID (United States). College of Natural Resources
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Division
  3. Oregon State Univ., Corvallis, OR (United States). Botany and Plant Pathology Dept.
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1566971
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
PLoS ONE
Additional Journal Information:
Journal Volume: 13; Journal Issue: 11; Journal ID: ISSN 1932-6203
Publisher:
Public Library of Science
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Newcombe, Georege, Muchero, Wellington, and Busby, Posy. Resistance to an eriophyid mite in an interspecific hybrid pedigree of Populus. United States: N. p., 2018. Web. https://doi.org/10.1371/journal.pone.0207839.
Newcombe, Georege, Muchero, Wellington, & Busby, Posy. Resistance to an eriophyid mite in an interspecific hybrid pedigree of Populus. United States. https://doi.org/10.1371/journal.pone.0207839
Newcombe, Georege, Muchero, Wellington, and Busby, Posy. Mon . "Resistance to an eriophyid mite in an interspecific hybrid pedigree of Populus". United States. https://doi.org/10.1371/journal.pone.0207839. https://www.osti.gov/servlets/purl/1566971.
@article{osti_1566971,
title = {Resistance to an eriophyid mite in an interspecific hybrid pedigree of Populus},
author = {Newcombe, Georege and Muchero, Wellington and Busby, Posy},
abstractNote = {Schizoempodium mesophyllincola is an eriophyid mite that feeds in leaves of Populus trichocarpa in the central part of this cottonwood tree’s range (i.e., coastal British Columbia, Washington and Oregon) in the Pacific Northwest (PNW) of North America, and on some interspecific hybrids planted in short-rotation, intensive forestry in the region. The mite, a leaf vagrant, sucks the contents of spongy mesophyll cells, causing leaf discoloration, or “bronzing.” Here, we investigate the inheritance pattern of resistance to leaf bronzing using a three-generation Populus trichocarpa x P. deltoides hybrid pedigree. We found that resistance to the mite is an exaptation in that its source in two related F2 families of the TxD hybrid pedigree was the non-native host, P. deltoides. Two grandparental genotypes of the latter, ‘ILL-5’ and ‘ILL-129’, were completely free of the bronzing symptom and that phenotype was inherited in a Mendelian manner in the F1 and F2. Resistance to S. mesophyllincola is similar to resistance to many other regional pathogens of P. trichocarpa (e.g., Melampsora occidentalis, Venturia inopina, Sphaerulina populicola, and Taphrina sp.) in that it is inherited from the non-native grandparent (e.g., P. deltoides, P. nigra, or P. maximowiczii) in three-generation, hybrid pedigrees. In addition to finding evidence for Mendelian inheritance, we found two QTLs with LOD scores 5.03 and 3.12 mapped on linkage groups (LG) III and I, and they explained 6.7 and 4.2% of the phenotypic variance, respectively. The LG I QTL is close to, or synonymous with, one for resistance to sap-feeding arthropods and leaf developmental traits as expressed in a British study utilizing the same pedigree.},
doi = {10.1371/journal.pone.0207839},
journal = {PLoS ONE},
number = 11,
volume = 13,
place = {United States},
year = {2018},
month = {11}
}

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Figures / Tables:

Fig 1 Fig 1: Leaf bronzing on Populus trichocarpa caused by Schizoempodium mesophyllincola.

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    Works referencing / citing this record:

    Contingency rules for pathogen competition and antagonism in a genetically based, plant defense hierarchy
    journal, May 2019

    • Busby, Posy E.; Crutsinger, Gregory; Barbour, Matthew
    • Ecology and Evolution, Vol. 9, Issue 12
    • DOI: 10.1002/ece3.5253

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