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Ultrastructure of mesophyll cells in and near necrotic spots on otherwise green needles of Norway spruce
Author(s) -
Sutinen Sirkka
Publication year - 1986
Publication title -
european journal of forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 0300-1237
DOI - 10.1111/j.1439-0329.1986.tb00204.x
Subject(s) - spots , biology , ultrastructure , chloroplast , picea abies , cytoplasm , botany , stroma , ribosome , microbiology and biotechnology , rna , genetics , immunohistochemistry , immunology , gene
The fine structure of mesophyll cells in and near necrotic spots on otherwise green needles of Picea abies were studied. The main changes were seen in the chloroplasts, which were extremely flat and smaller than normally. The stroma was minute and the envelopes were degenerating or degenerated. Furthermore, ribosome‐like particles were accumulated both in the stroma and in the degenerated cytoplasm. The character of the changes suggests the action of ozone. The necrotic spots with typical fine structural injuries were seen before the wintering of the youngest needles suggesting that the spots here can not be primarily caused by winter coldness.