Leaf epidermal transmittance of ultraviolet radiation and its implications for plant sensitivity to ulraviolet-radiation induced injury
Leaf epidermal transmittance of ultraviolet radiation and its implications for plant sensitivity to ulraviolet-radiation induced injury
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DOI：
10.1007/bf00345107
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发表时间：
2004
期刊：
影响因子：
2.7
通讯作者：
R. Robberecht;M. Caldwell
中科院分区：
文献类型：
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作者：
R. Robberecht;M. Caldwell
测定了几种植物的叶表皮对紫外线(280-400 nm)的透过率，以确定叶表皮对太阳紫外线辐射的衰减能力。用机械分离的方法分离表皮样本，用分光辐射计/积分球进行透过率检查。对25种暴露在自然日照下的植物进行了调查。虽然不同物种的生活型、栖息地类型和表皮特征不同，但其表皮透过率一般不到10%。在超过一半的物种中，紫外线辐射减弱了95%到99%。在16种植物中，表皮中的类黄酮和相关色素占衰减的20%至57%。在温室内，几种植物在补充紫外线(288~315 nm)照射下，其表皮透光率显著降低(P≦0.05)，降幅为31%~47%，这显然是由于吸收紫外线的色素增加所致。
Leaf epidermal transmittance of ultraviolet radiation (280–400 nm) was examined in several plant species to determine the capability of the epidermis to attenuate solar ultraviolet radiation. Epidermal samples were mechanically isolated and examined with a spectroradiometer/integrating sphere for transmittance. A survey of 25 species exposed to natural insolation was conducted. Although the species differed in life form, habitat type, and epidermal characteristics, epidermal transmittance was generally less than 10%. Ultraviolet radiation was attenuated 95 to 99% in more than half of the species. In 16 species, flavonoid and related pigments in the epidermis accounted for 20 to 57% of the attenuation. Several species exposed to supplemental ultraviolet irradiation (288–315 nm) in a greenhouse exhibited significant (P≦0.05) depressions in epidermal transmittance of 31 to 47%, apparently resulting from an increase in ultraviolet-absorbing pigments.