Digital measurement of heliotropic leaf response in soybean cultivars and leaf exposure to solar UVB radiation
Digital measurement of heliotropic leaf response in soybean cultivars and leaf exposure to solar UVB radiation
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DOI：
10.1016/j.agrformet.2003.08.013
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发表时间：
2003-12-24
影响因子：
6.2
通讯作者：
Gao, W
中科院分区：
文献类型：
--
作者：
Bawhey, CI;Grant, RH;Gao, W
对报道的大豆品种[Glycine max（L.）梅尔。]增强的紫外线B（UVB）辐照度的差异可能部分是由于实验条件的辐射环境的差异或由于日光响应引起的暴露差异。为了研究向日运动对大豆上三叶UVB暴露的影响，电子记录叶片位置，并计算三个大豆品种-Bay、约克和威廉姆斯82-在温室和田间条件下的叶片的倾斜度和方位角位置。利用各向异性和各向同性的天空辐射率分布，模拟了3个大豆品种的顶三叶的UVB照射量。威廉姆斯82 cv.结果表明，三个品种的叶片角度随太阳天顶角的变化最大，平均在19 - 47度之间，而约克和海湾品种的叶片角度随太阳天顶角的变化较小，在10- 27度之间。田间植物上部三叶的入射角数据与温室植物没有显著差异。对于晴朗的天空条件下，整体曝光差异表明，海湾品种接收更多的UVB比约克或威廉姆斯82品种，在很大程度上是由于较高的变化，在向日运动所示的海湾品种在响应太阳的位置。(C)2003 Elsevier B. V.保留所有权利。
Inconsistencies in reported sensitivities of soybean cultivars [Glycine max (L.) Merr.] to enhanced ultraviolet-B (UVB) irradiance may in part be due to differences in the radiative environment of the experimental conditions or differences in exposure due to heliotropic response. In order to examine the impact of heliotropic movement on UVB exposure of the soybean upper trifoliate, leaf position was electronically recorded and inclination and azimuthal position of the leaves calculated for three soybean cultivars-Bay, York, and Williams 82-under greenhouse and field conditions. The UVB exposures of the top trifoliate of three soybean cultivars were modeled using anisotropic and isotropic sky radiance distributions. The Williams 82 cv. produced the greatest variation in leaf angle with solar zenith angle of the three cultivars, averaging between 19 and 47degrees, compared with a lower 10-27degrees range for York and Bay cultivars. The incidence angle data for the upper trifoliates of the field plants were not significantly different from the greenhouse plants. For clear sky conditions, overall exposure differences indicated that the Bay cultivar receives more UVB than the York or Williams 82 cultivars, in large part due to the higher variation in heliotropic movement shown by the Bay cultivar in response to the sun location. (C) 2003 Elsevier B.V. All rights reserved.