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Histological differentiation among abiotic causes of conifer needle necrosis .

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Title	Histological differentiation among abiotic causes of conifer needle necrosis.
Creator	Carlson, Clinton E.
Contributor	Gilligan, Carma J. ;<br> Intermountain Forest and Range Experiment Station (Ogden, Utah)
Description	Symptoms induced by phytotoxic gases within conifer needles can be differentiated histologically from those causes by other abiotic agents including winter drying, drought, and salt. However, it is not possible to differentiate among symptoms causes by hydrogen fluoride, sulfur dioxide, ethyl mercaptan, and hydrogen sulfide. Phytotoxic gases cause hypertrophy and hyperplasia of vascular parenchyma, endodermis collapse, and intense vascular staining. The other abiotic agents induce mesophyll collapse with little or no observable effects on vascular tissues. Histological analyses should be useful in diagnosis of air pollution-induced injury and damage in coniferous forests.
Publisher	Ogden, UT : U.S. Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, 1983.
Subject	Conifers.
Relation	Research paper INT ; 298
Source	A 13.78:INT-298
Date Original	1983-03-01
Date Digital	2007;
Type	text
Format	application/pdf
Resource Identifier	mtg002095
Contributing Institution	The University of Montana
Language	en
Digitization Specifications	Scanned by Lacey Gibbons using an OpticBook 3600 scanner at 400 dpi, 8 bit gray scale. Master images stored as TIFF and derivatives presented as PDF. Abbey FineReader 8.0 used for optical character recognition.