Document Detail

Transgressive physiological and transcriptomic responses to light stress in allopolyploid Glycine dolichocarpa (Leguminosae).
MedLine Citation:
PMID:  23149457     Owner:  NLM     Status:  MEDLINE    
Allopolyploidy is often associated with increased photosynthetic capacity as well as enhanced stress tolerance. Excess light is a ubiquitous plant stress associated with photosynthetic light harvesting. We show that under chronic excess light, the capacity for non-photochemical quenching (NPQ(max)), a photoprotective mechanism, was higher in a recently formed natural allotetraploid (Glycine dolichocarpa, designated 'T2') than in its diploid progenitors (G. tomentella, 'D3'; and G. syndetika, 'D4'). This enhancement in NPQ(max) was due to an increase in energy-dependent quenching (qE) relative to D3, combined with an increase in zeaxanthin-dependent quenching (qZ) relative to D4. To explore the genetic basis for this phenotype, we profiled D3, D4 and T2 leaf transcriptomes and found that T2 overexpressed genes of the water-water cycle relative to both diploid progenitors, as well as genes involved in cyclic electron flow around photosystem I (CEF-PSI) and the xanthophyll cycle, relative to D4. Xanthophyll pigments have critical roles in NPQ, and the water-water cycle and CEF-PSI are non-photosynthetic electron transport pathways believed to facilitate NPQ formation. In the absence of CO(2), T2 also exhibited greater quantum yield of photosystem II than either diploid, indicating a greater capacity for non-photosynthetic electron transport. We postulate that, relative to its diploid progenitors, T2 is able to achieve higher NPQ(max) due to an increase in xanthophyll pigments coupled with enhanced electron flow through the water-water cycle and CEF-PSI.
J E Coate; A F Powell; T G Owens; J J Doyle
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-11-14
Journal Detail:
Title:  Heredity     Volume:  110     ISSN:  1365-2540     ISO Abbreviation:  Heredity (Edinb)     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-16     Completed Date:  2013-06-17     Revised Date:  2014-02-04    
Medline Journal Info:
Nlm Unique ID:  0373007     Medline TA:  Heredity (Edinb)     Country:  England    
Other Details:
Languages:  eng     Pagination:  160-70     Citation Subset:  IM    
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MeSH Terms
Fabaceae / metabolism,  physiology,  radiation effects*
Gene Expression / radiation effects
Gene Expression Regulation, Plant / radiation effects
Genes, Plant
Oxidative Stress / radiation effects*
Photosystem II Protein Complex / metabolism
Plant Leaves / metabolism,  physiology,  radiation effects*
Plant Proteins / genetics,  metabolism
Stress, Physiological / radiation effects
Transcriptome / radiation effects*
Reg. No./Substance:
0/Photosystem II Protein Complex; 0/Plant Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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