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- Title
Natural variation in ozone sensitivity among Arabidopsis thaliana accessions and its relation to stomatal conductance.
- Authors
BROSCHÉ, MIKAEL; MERILO, EBE; MAYER, FLORIAN; PECHTER, PRIIT; PUZÕRJOVA, IRINA; BRADER, GÜNTER; KANGASJÄRVI, JAAKKO; KOLLIST, HANNES
- Abstract
Genetic variation between naturally occurring populations provides a unique source to unravel the complex mechanisms of stress tolerance. Here, we have analysed O3 sensitivity of 93 natural Arabidopsis thaliana accessions together with five O3-sensitive mutants to acute O3 exposure. The variation in O3 sensitivity among the natural accessions was much higher than among the O3-sensitive mutants and corresponding wild types. A subset of nine accessions with major variation in their O3 responses was studied in more detail. Among the traits assayed, stomatal conductance ( gst) was an important factor determining O3 sensitivity of the selected accessions. The most O3-sensitive accession, Cvi-0, had constitutively high gst, leading to high initial O3 uptake rate and dose received during the first 30 min of exposure. Analyzing O3-induced changes in stress hormone concentrations indicated that jasmonate (JA) concentration was also positively correlated with leaf damage. Quantitative trait loci (QTL) mapping in a Col-0 × Cvi-0 recombinant inbred line (RIL) population identified three QTLs for O3 sensitivity, and one for high water loss of Cvi-0. The major O3 QTL mapped to the same position as the water loss QTL further supporting the role of stomata in regulating O3 entry and damage.
- Subjects
OZONE; GENETIC polymorphisms; ARABIDOPSIS thaliana; STOMATA; BRASSICACEAE
- Publication
Plant, Cell & Environment, 2010, Vol 33, Issue 6, p914
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.2010.02116.x