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Influence of rooting medium pH and shoot and root temperature on the nitrate reductase activity of winter barley
Author(s) -
Klessa David A,
Hall David A,
Sym Gordon J
Publication year - 1990
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740500402
Subject(s) - nitrate reductase , shoot , nitrate , nitrogen , chemistry , horticulture , botany , agronomy , biology , organic chemistry
In three separate experiments, the effects of rooting medium pH (pH 4.0, 5.3 and 6.5), root temperature (5, 10 and 15 C) and shoot temperature (6 and 17 C) on the growth, in‐vivo nitrate reductase activity and nitrogen status of winter barley were investigated. Except where temperature was specifically studied, air and/or root temperatures were maintained at 10 C to simulate the typically cool conditions which prevail during the early growing season for cereals in northern Europe. Although growth, nitrate uptake and nitrate reductase activity were markedly affected by variations in temperature and pH. the Nitrogen Response Index, which is the quotient of in‐vivo induced and endogenous nitrate reductase activities in shoot or root material, was unaffected and uniquely reflected the N status of the plant.