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Genetic architecture of spring and autumn phenology in Salix

Ghelardini, Luisa and Berlin Kolm, Sofia and Weih, Martin and Lagercrantz, Ulf and Gyllenstrand, Niclas and Rönnberg Wästljung, Ann-Christin (2014). Genetic architecture of spring and autumn phenology in Salix. BMC plant biology. 14:31, 1-18
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Official URL: http://dx.doi.org/10.1186/1471-2229-14-31

Abstract

BACKGROUND
In woody plants from temperate regions, adaptation to the local climate results in annual cycles of growth and dormancy, and optimal regulation of these cycles are critical for growth, long-term survival, and competitive success. In this study we have investigated the genetic background to growth phenology in a Salix pedigree by assessing genetic and phenotypic variation in growth cessation, leaf senescence and bud burst in different years and environments. A previously constructed linkage map using the same pedigree and anchored to the annotated genome of P. trichocarpa was improved in target regions and used for QTL analysis of the traits. The major aims in this study were to map QTLs for phenology traits in Salix, and to identify candidate genes in QTL hot spots through comparative mapping with the closely related Populus trichocarpa. 
RESULTS
All traits varied significantly among genotypes and the broad-sense heritabilities ranged between 0.5 and 0.9, with the highest for leaf senescence. In total across experiment and years, 80 QTLs were detected. For individual traits, the QTLs explained together from 21.5 to 56.5% of the variation. Generally each individual QTL explained a low amount of the variation but three QTLs explained above 15% of the variation with one QTL for leaf senescence explaining 34% of the variation. The majority of the QTLs were recurrently identified across traits, years and environments. Two hotspots were identified on linkage group (LG) II and X where narrow QTLs for all traits co-localized. 
CONCLUSIONS
This study provides the most detailed analysis of QTL detection for phenology in Salix conducted so far. Several hotspot regions were found where QTLs for different traits and QTLs for the same trait but identified during different years co-localised. Many QTLs co-localised with QTLs found in poplar for similar traits that could indicate common pathways for these traits in Salicaceae. This study is an important first step in identifying QTLs and candidate genes for phenology traits in Salix.

Authors/Creators:Ghelardini, Luisa and Berlin Kolm, Sofia and Weih, Martin and Lagercrantz, Ulf and Gyllenstrand, Niclas and Rönnberg Wästljung, Ann-Christin
Title:Genetic architecture of spring and autumn phenology in Salix
Series/Journal:BMC plant biology (10381464)
Year of publishing :2014
Volume:14
Number:31
Page range:1-18
Number of Pages:18
Publisher:BioMed Central
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:F Plant production > F30 Plant genetics and breeding
K Forestry > K01 Forestry - General aspects
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Botany
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Genetics and Breeding
Agrovoc terms:phenology, adaptation, Salix, QTL (quantitative trait loci), genes
Keywords:phenology, adaptation, Salix, QTL, candidate genes
URN:NBN:urn:nbn:se:slu:epsilon-e-2043
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2043
Additional ID:
Type of IDID
Web of Science (WoS)000334471800001
DOI10.1186/1471-2229-14-31
ID Code:11383
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Crop Production Ecology
(NL, NJ) > Department of Plant Biology (from 140101)
Deposited By: SLUpub Connector
Deposited On:13 Aug 2014 09:49
Metadata Last Modified:02 Dec 2014 11:07

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