Journal Article

Influence of ozone on cold acclimation in sugar maple seedlings

Annick Bertrand, Gilles Robitaille, Paul Nadeau and Yves Castonguay

in Tree Physiology

Volume 19, issue 8, pages 527-534
Published in print July 1999 | ISSN: 0829-318X
Published online July 1999 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/19.8.527
Influence of ozone on cold acclimation in sugar maple seedlings

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During summer 1994, sugar maple (Acer saccharum Marsh.) seedlings were grown in open-top chambers supplied with air containing near ambient ozone concentration (control, low O3) or three times the ambient ozone concentration (high O3). The rate of CO2 assimilation was significantly reduced by chronic exposure to a high concentration of ozone during the summer. During fall, seedlings were removed from the open-top chambers and acclimated to cold under natural conditions. In both species during cold acclimation, the starch concentration decreased, whereas the sucrose concentration increased. There was no treatment effect on the freezing tolerance of roots, even though roots in the high-O3 treatment accumulated higher concentrations of the cryoprotective oligosaccharides raffinose and stachyose than control roots. Cold acclimation occurred earlier and stachyose concentration of stems was higher in high-O3-treated seedlings than in low-O3-treated seedlings. Cold acclimation was associated with an earlier accumulation of ABA in the xylem sap of high-O3-treated seedlings compared with low-O3-treated seedlings.

Keywords: abscisic acid; Acer saccharum; carbohydrates; raffinose; stachyose; starch; sucrose

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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