Gamon J A, Field C B, Bilger W, Björkman O, Fredeen A L, Peñuelas J
Department of Plant Biology, Carnegie Institution of Washington, 290 Panama Street, 94305, Stanford, CA, USA.
Oecologia. 1990 Nov;85(1):1-7. doi: 10.1007/BF00317336.
Sudden illumination of sunflower (Helianthus annuus L. cv. CGL 208) leaves and canopies led to excess absorbed PFD and induced apparent reflectance changes in the green, red and near-infrared detectable with a remote spectroradiometer. The green shift, centered near 531 nm, was caused by reflectance changes associated with the de-epoxidation of violaxanthin to zeaxanthin via antheraxanthin and with the chloroplast thylakoid pH gradient. The red (685 nm) and near-infrared (738 nm) signals were due to quenching of chlorophyll fluorescence. Remote sensing of shifts in these spectral regions provides non-destructive information on in situ photosynthetic performance and could lead to improved techniques for remote sensing of canopy photosynthesis.
对向日葵（向日葵品种CGL 208）叶片和冠层进行突然光照，会导致吸收的光合有效辐射（PFD）过量，并引起绿色、红色和近红外波段的表观反射率变化，这些变化可用遥测光谱辐射计检测到。以531nm附近为中心的绿移是由与紫黄质经中间态的环氧玉米黄质去环氧化形成玉米黄质相关的反射率变化以及叶绿体类囊体pH梯度引起的。红色（685nm）和近红外（738nm）信号是由于叶绿素荧光猝灭所致。对这些光谱区域变化的遥感可为原位光合性能提供无损信息，并可能带来改进的冠层光合作用遥感技术。
