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Proceedings Paper

Impact of enhanced ultraviolet-B irradiance on maize yield and its seed qualities: a field evaluation
Author(s): Wei Gao; Youfei Zheng; James R. Slusser; Gordon M. Heisler; Douliang He; Jianqiang Xu
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Paper Abstract

Stratospheric ozone depletion has caused an increase in the amount of UV-B radiation reaching the earth’s surface. Numerous investigations have demonstrated that the effect of UV-B enhancements on plants includes reduction in grain yield, alteration in species competition, susceptibility to disease, and changes in plant structure and pigmentation. Many experiments examining UV-B radiation effects on plants were conducted in growth chambers or greenhouses. It has been questioned if the effect of UV-B radiation on plants can be extrapolated to field responses from indoor studies because of the unnaturally high ratios of UV-B/UV-A and UV-B/PAR in many indoor studies. Field studies on UV-B radiation effect on plants has been recommended in order to use the UV and PAR irradiance provided by natural light. This study reported the growth and yield responses of a maize crop exposed to enhanced UV-B radiation and the UV-B effects on maize seed qualities under field conditions. Enhanced UV-B radiation caused a significant reduction of the dry matter accumulation, and the maize yield in turn was affected. With increased UV-B radiation the flavonoid accumulation in maize leaves increased, and the contents of chlorophyll a, b, and (a+b) of maize leaves were reduced. The levels of protein, sugar, and starch of maize seed decreased with enhanced UV-B radiation, while the level of lysine increased with enhanced UV-B radiation.

Paper Details

Date Published: 1 July 2003
PDF: 6 pages
Proc. SPIE 4896, Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, (1 July 2003); doi: 10.1117/12.466201
Show Author Affiliations
Wei Gao, Colorado State Univ. (United States)
Youfei Zheng, Nanjing Institute of Meteorology (China)
James R. Slusser, Colorado State Univ. (United States)
Gordon M. Heisler, U.S. Dept. of Agriculture Forest Service (United States)
Douliang He, Nanjing Institute of Meteorology (China)
Jianqiang Xu, Nanjing Institute of Meteorology (China)

Published in SPIE Proceedings Vol. 4896:
Ultraviolet Ground- and Space-based Measurements, Models, and Effects II
Wei Gao; Jay R. Herman; Guangyu Shi; Kazuo Shibasaki; James R. Slusser, Editor(s)

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