Photosynthesis and Transpiration of Loblolly Pine Seedlings as Influenced by Moisture-Stress Conditioning
Abstract:This study was conducted to investigate the potential for modifying drought tolerance of loblolly pine (Pinus taeda L.). Photosynthesis, transpiration rate, and water-use efficiency of loblolly pine seedlings were evaluated following exposure to sublethal water stress. One-year-old loblolly pine seedlings were exposed to 8 weeks of moisture-stress conditioning (MSC); seedlings were watered only when pre-dawn needle water potentials fell below - 1.4 MPa. A control group of seedlings was kept well watered. Seedlings exposed to MSC continued photosynthesis to much lower needle water potentials than controls. This response is at least partially attributed to the significant 0.45 MPa decrease in needle osmotic potential found in MSC seedlings. Although it is not clear whether this adjustment was an active osmotic adjustment, it did result in MSC seedlings being able to maintain turgor to lower needle water potentials. Transpiration rate was decreased 30 percent and water-use efficiency increased 67 percent as a result of MSC. These responses all indicate significant improvements in loblolly pine drought tolerance as a result of moisture-stress conditioning. Forest Sci. 31:742-749.
Document Type: Journal Article
Affiliations: Assistant Professor, Department of Forestry, School of Forest Resources and Conservation, University of Florida, Gainesville, FL 32611
Publication date: 1985-09-01
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