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- W2043070423 abstract "The fine structure of the cuticle of mature needles of Pinus radiata has been studied from electron micrographs of carbon replicas of the needle surface. The whole of the needle surface appears to be covered by a layer of wax from which, with the exception of the inner surface normally enclosed by the sheath, arise numerous tubular waxy outgrowths similar to those previously observed in P. sylvestris. Unlike P. sylvestris, these outgrowths cover only a portion of the exposed needle surface and the underlying wax layer ranges in appearance from smooth to slightly granular, with no indication of a plate-like structure. When the needles were immersed in water, very little was taken up into the basal region of the needles normally enclosed by the sheath compared with the exposed surfaces; the tips of the needles showed the highest permeability to water. The inner surfaces of the needles were consistently more wettable than the outer surfaces, and the surfaces normally enclosed by the basal sheath, corresponding to the youngest regions of the needle, were much less wettable than the exposed surfaces. The inner enclosed surface was the least wettable of all; this may be due to differences in the chemical composition of the wax, besides the absence of weathering. When young needles were prematurely exposed by removing the basal sheath, tubular, waxy outgrowths appeared, similar to those found on the exposed surfaces of the mature needles; when young needles were bound together to prevent them from parting, an entirely different structure developed consisting of minute granules forming a reticulum over the surface. The significance of the above findings is discussed in relation to the reputed relatively high cuticular transpiration of P. radiata and its ability to absorb water directly into the foliage from precipitation; it appears that this species is well adapted to the moist atmospheric conditions characteristic of its native habitat in the Californian ‘fog belt’ region." @default.
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- W2043070423 date "1968-01-01" @default.
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- W2043070423 title "CUTICLE STRUCTURE AND WATER RELATIONS OF THE NEEDLES OF PINUS RADIATA (D. DON)" @default.
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- W2043070423 doi "https://doi.org/10.1111/j.1469-8137.1968.tb05451.x" @default.
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