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Elevated carbon dioxide and/or ozone concentrations induce hormonal changes in Pinus tabulaeformis.
Xue-Mei Li1, Li-Hong Zhang, Lian-Ju Ma
1College of Chemical and Life Science, Shenyang Normal University, Shenyang, People's Republic of China. lxmls132@163.com
Journal of Chemical Ecology
|May 26, 2011
Summary
Elevated carbon dioxide (CO(2)) boosted plant hormone levels and needle growth in pine trees. CO(2) also mitigated negative impacts from increased ozone (O(3)) exposure, suggesting a protective effect on tree health.
Area of Science:
- Plant Physiology
- Environmental Science
- Forest Ecology
Background:
- Plants are exposed to changing atmospheric conditions, including elevated carbon dioxide (CO(2)) and ozone (O(3)).
- These environmental factors can influence plant hormone levels and growth, impacting overall tree health and productivity.
Purpose of the Study:
- To investigate the effects of elevated CO(2) and O(3) on endogenous plant hormones and needle growth in Pinus tabulaeformis.
- To determine if CO(2) exposure can ameliorate the negative impacts of O(3) on tree physiology and growth.
Main Methods:
- Pinus tabulaeformis seedlings were grown in open-top chambers under controlled conditions.
- Plants were exposed to ambient or elevated concentrations of CO(2) and/or O(3) for 100 days.
- Needle growth (fresh and dry weight) and endogenous plant hormone levels (IAA, iPA, DHZR, ABA, ZR) were measured.
Main Results:
- Elevated CO(2) increased fresh needle weight and levels of IAA, iPA, and DHZR, while decreasing ABA. The IAA/ABA and total cytokinins (CKs)/ABA ratios increased.
- Elevated O(3) decreased IAA and ZR, increased ABA, and reduced the IAA/ABA and CKs/ABA ratios.
- Combined CO(2) and O(3) treatment increased ABA and the IAA/ABA ratio but decreased the CKs/ABA ratio, with no significant effect on overall growth.
Conclusions:
- Elevated CO(2) positively influences plant hormone balance and needle growth in Pinus tabulaeformis.
- Elevated CO(2) can counteract the detrimental effects of elevated O(3) on tree growth, indicating a potential mitigating role in a changing climate.
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