Intra- and inter-specific comparisons of leaf UV-B absorbing-compound concentration of southern broadleaf trees in the United States

Yadong Qi; Shuju Bai; Wei Gao; Gordon M. Heisler

doi:10.1117/12.466231

1 July 2003 Intra- and inter-specific comparisons of leaf UV-B absorbing-compound concentration of southern broadleaf trees in the United States

Yadong Qi, Shuju Bai, Wei Gao, Gordon M. Heisler

Author Affiliations +

Proceedings Volume 4896, Ultraviolet Ground- and Space-based Measurements, Models, and Effects II; (2003) https://doi.org/10.1117/12.466231
Event: Third International Asia-Pacific Environmental Remote Sensing Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2002, Hangzhou, China

Abstract

Increased concentration of leaf UV-B absorbing-compounds due to exposure to UV-B radiation is widely accepted as one of the plant adaptations to resist enhanced UV-B radiation. This paper reports a field comparative study of dynamics and temporal changes of UV-B absorbing-compound concentration in 35 southern broadleaf trees over a growing season. Leaf UV-B absorbing-compound, chlorophyll concentration, and leaf thickness were measured from the sun-exposed leaves of 35 tree species collected monthly from individual trees growing within the city of Baton Rouge, Louisiana from April to October in 2000. The USDA UV-B Monitoring Network Baton Rouge Station provided the ambient UV-B radiation data. Leaf UV-B absorbing-compound concentration varied significantly with leaf age and species. Intra-specifically, leaf UV-B absorbing-compound concentration exhibited a generally increasing trend during leaf growth and development in response to the increased exposure to natural UV-B/solar radiation during the growing season. Inter-specifically, significant differences existed in leaf UV-B absorbing-compound concentration. The species were compared and ranked based on the growing season averages of the leaf total UV-B absorbing-compound concentration. The species were further classified into three levels (high, medium, and low) based on the magnitude of UV-B absorbing-compound concentration.

Citation Download Citation

Yadong Qi, Shuju Bai, Wei Gao, and Gordon M. Heisler "Intra- and inter-specific comparisons of leaf UV-B absorbing-compound concentration of southern broadleaf trees in the United States", Proc. SPIE 4896, Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, (1 July 2003); https://doi.org/10.1117/12.466231

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