期刊
NEW PHYTOLOGIST
卷 171, 期 4, 页码 751-758出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1469-8137.2006.01783.x
关键词
foliar manganese; Gossia bidwillii; hyperaccumulator; manganese sequestration; palisade mesophyll; photosynthetic tissues; proton induced X-ray emission; energy dispersive X-ray analysis (PIXE/EDAX) localization; Virotia neurophylla
Little is known about the spatial distribution of excess manganese (Mn) in the leaves of tolerant plants. Recently, the first such study of a Mn hyperaccumulator showed that the highest localized Mn concentrations occur in the photosynthetic tissue. This is in contrast to reports based on localization of foliar accumulation of other heavy metals. Here, four tree species, Gossia bidwillii, Virotia neurophylla, Macadamia integrifolia and Macadamia tetraphylla, which hyperaccumulate or strongly accumulate Mn, were studied. Cross-sectional foliar Mn localization was carried out in situ using proton-induced X-ray emission/energy dispersive X-ray analysis (PIXE/EDAX). All four species contained photosynthetic tissues with multiple palisade layers. These were shown to be the primary sequestration sites for Mn. Mn was not detected in the epidermal tissues. The findings of this study demonstrate a concurrence of three traits in four tree species, that is, accumulation of excess Mn in the leaves, its primary sequestration in the photosynthetic tissues, and multiple-layer palisade mesophyll.
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