表皮(毛发)
表皮蜡
化学
蜡
植物角质层
红外光谱学
纳米尺度
红外线的
纳米技术
材料科学
有机化学
光学
遗传学
生物
物理
作者
Charles M. Farber,Rui Wang,Robert Chemelewski,John E. Mullet,Dmitry Kurouski
标识
DOI:10.1021/acs.analchem.8b05294
摘要
The cuticle covers external surfaces of plants, protecting them from biotic and abiotic stress factors. Epicuticular wax on the outer surface of the cuticle modifies reflectance and water loss from plant surfaces and has direct and indirect effects on photosynthesis. Variation in epicuticular wax accumulation, composition, and nanoscale structural organization impacts its biological function. Atomic force microscope infrared spectroscopy (AFM-IR) was utilized to investigate the internal and external surfaces of the cuticle of Sorghum bicolor, an important drought-tolerant cereal, forage, and high-biomass crop. AFM-IR revealed striking heterogeneity in chemical composition within and between the surfaces of the cuticle. The wax aggregate crystallinity and distribution of chemical functional groups across the surfaces was also probed and compared. These results, along with the noninvasive nondestructive nature of the method, suggest that AFM-IR can be used to investigate mechanisms of wax deposition and transport of charged molecules through the plant cuticle.
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