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NITROGEN METABOLISM IN POTERIUM SANGUISORBA DURING WATER STRESS
Author(s) -
TAYLOR A. A.,
DEFELICE J.,
HAVILL D. C.
Publication year - 1982
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1982.tb03236.x
Subject(s) - nitrate reductase , glutamine synthetase , shoot , proline , chemistry , vermiculite , nitrogen , nitrogen assimilation , metabolism , enzyme , glutamine , nitrogen cycle , amino acid , polyethylene glycol , botany , assimilation (phonology) , biochemistry , horticulture , biology , organic chemistry , linguistics , philosophy
S ummary Water stress, produced either by the addition of polyethylene glycol 4000 to water culture‐grown Poterium sanguisorba or by withholding water from vermiculite‐grown material, reduced nitrate reductase activity, but increased the level of glutamine synthetase in shoots, in roots the levels of all the nitrogen‐assimilating enzymes studied were reduced. In both tissues these changes were accompanied by a fall in soluble protein and water content and by an increase in the total a‐amino and proline pools. Marked changes in shoot individual amino acids were also induced by water stress, but were reversed when stress was relieved. The significance of these changes are discussed in relation to nitrogen assimilation and the mechanism of proline accumulation during drought.