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1 February 2004 Elevated Ultraviolet-B Radiation Induces Cross-protection to Cold in Leaves of Rhododendron Under Field Conditions
Linda Chalker-Scott, James D. Scott
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Abstract

Previously, we have shown a cold-hardening response in Rhododendron ‘English Roseum’ exposed to elevated ultraviolet-B radiation (UV-B, 280–320 nm) under growth chamber conditions. We have conducted the present study under field conditions to provide for a higher ratio of photosynthetically active radiation to UV-B (PAR:UV-B) than is possible in the laboratory and to more accurately reflect natural conditions of solar irradiance. Leaf disks taken after 3 months from UV-B–exposed plants exhibited a greater tolerance to freezing temperatures than those from control plants that received no supplemental UV-B exposure during this time. Leaf disks taken from UV-B–irradiated plants survived temperatures below −8°C, whereas control disks were killed at −6°C. Cold hardiness did not significantly increase until September, when environmental cues such as decreasing day length and night temperatures also may have enhanced hardening. Our field findings confirm our previous laboratory study, demonstrating that elevated UV-B induces cross-protection to cold in Rhododendron leaf tissues.

Linda Chalker-Scott and James D. Scott "Elevated Ultraviolet-B Radiation Induces Cross-protection to Cold in Leaves of Rhododendron Under Field Conditions," Photochemistry and Photobiology 79(2), 199-204, (1 February 2004). https://doi.org/10.1562/0031-8655(2004)079<0199:EURICT>2.0.CO;2
Received: 6 June 2003; Accepted: 1 November 2003; Published: 1 February 2004
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