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Effect of Mercuric Compounds on Pine and Sycamore Germination and Early Survival

American Journal of Plant Sciences 2012年第1期3卷 150-158页

作者： Sharon R. Jean-Philippe Nicole Labbé jeremie damay Jennifer A. Franklin Karen Hughes 不详

Mercury pollution has become an important current issue as a result of its environmental effects on a global scale. The Oak Ridge Reservation, established in 1942, was the designated site for the construction of the atomic bomb. During a 20-year period from 1944-1963 radioactive and toxic chemical pollutants, especially mercury compounds were released into the surrounding waterways.A germination study was conducted to investigate the ability of three tree species, American sycamore (Platanus occidentalis),shortleaf pine (Pinus echinata), and loblolly pine (Pinus taeda) seeds to germinate in mercuric nitrate (Hg(NO3)2 and methylmercury chloride (CH3HgCl) solutions. A subsequent greenhouse study was conducted to assess the phytotoxic effects of different mercuric solutions on Platanus occidentalis (American Sycamore), inoculated with soils from East Fork Poplar *** also measured vegetation stress by Near Infrared (NIR) *** wavelengths examined were those thatare specific to chlorophyll and several carotenoids, which are involved in photosynthesis: 430 nm (Chl a), 448 nm (Chl b, carotenoids), 471 nm (carotenoids), 642 nm (Chl b), 662 & 680 nm (Chl a). Principal component analysis (PCA) was performed to identify patterns in sycamore leaf spectral *** in vitro conditions, as mercury concentration increased above 100 mg·kg-1, germination of all species decreased, with P. echinata being the least sensitive. Germination was inhibited more when seeds were exposed to methyl mercury chloride than to mercuric nitrate. Organic species of mercury proved to be more toxic than inorganic species of mercury in our greenhouse study. Significant changes occurred in levels of all pigments sampled (p430, p448, p471, p642, p662, and p680) over the course of the experiment. NIR spectroscopy was not sensitive enough to detect other chemical changes to foliage following mercury application.

关键词： Emergence Mercuric Compounds NIR Pigments

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Effect of Mercuric Compounds on Pine and Sycamore Germination and Early Survival

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American Journal of Plant Sciences（美国植物学期刊） 2012年第1期

作者： Sharon R. Jean-Philippe Nicole Labbé jeremie damay Jennifer A. Franklin Karen Hughes

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