Journal Article

Acclimation of loblolly pine (<i>Pinus taeda</i>) seedlings to high temperatures

Robert O. Teskey and Rodney E. Will

in Tree Physiology

Volume 19, issue 8, pages 519-525
Published in print July 1999 | ISSN: 0829-318X
Published online July 1999 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/19.8.519
Acclimation of loblolly pine (Pinus taeda) seedlings to high temperatures

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To determine the extent to which loblolly pine seedlings (Pinus taeda L.) acclimate to high temperatures, seedlings from three provenances—southeastern Texas (mean annual temperature 20.3 °C), southwestern Arkansas (mean annual temperature 16.2 °C) and Chesapeake, Maryland (mean annual temperature 12.8 °C)—were grown at constant temperatures of 25, 30, 35 or 40 °C in growth chambers. After two months, only 14% of the seedlings in the 40 °C treatment survived, so the treatment was dropped from the experiment. Provenance and family differences were not significant for most measured variables. Total biomass was similar in the 25 and 30 °C treatments, and less in the 35 °C treatment. Foliage biomass was higher, and root biomass lower, in the 30 °C treatment compared with the 25 °C treatment. Net photosynthesis and dark respiration of all seedlings were measured at 25, 30 and 35 °C. Both net photosynthesis and dark respiration exhibited acclimation to the temperature at which the seedlings were grown. For each temperature treatment, the highest rate of net photosynthesis was measured at the growth temperature. Dark respiration rates increased with increasing measurement temperature, but the basal rate of respiration, measured at 25 °C, decreased from 0.617 μmol m−2 s−1 in the 25 °C treatment to 0.348 μmol m−2 s−1 in the 35 °C treatment, resulting in less carbon loss in the higher temperature treatments than if the seedlings had not acclimated to the growth conditions. Temperature acclimation, particularly of dark respiration, may explain why total biomass of seedlings grown at 30 °C was similar to that of seedlings grown at 25 °C.

Keywords: biomass; dark respiration; net photosynthesis; provenance

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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