Effects of temperature, levels of nitrate supply and duration of light and growth on nitrate reductase activity in Agrostis tenuis and Agrostis stolonifera

Nitrate reductase activity (NRA) was assessed at several moments within the day during the early stages of establishment of tiller generated plants and seedling swards of Agrostis tenuis and A. stolonifera grown at different temperatures and levels of nitrate supply. Agrostis tenuis consistently exh...

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Bibliographic Details
Published in:The New phytologist 1983-01, Vol.93 (2), p.193-201
Main Authors: Harris, P, Whittington, W.J
Format: Article
Language:English
Subjects:
Agriculture
Agrostis stolonifera
Agrostis tenuis
Nitrates
Photoperiod
plant biochemistry
plant nutrition
Plant physiology
Plant roots
Plants
Productivity
Seedlings
Sward
Tillers
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Summary:Nitrate reductase activity (NRA) was assessed at several moments within the day during the early stages of establishment of tiller generated plants and seedling swards of Agrostis tenuis and A. stolonifera grown at different temperatures and levels of nitrate supply. Agrostis tenuis consistently exhibited higher NRA values than A. stolonifera at initial developmental stages or low nitrate availability. The reverse situation was found to occur at high nitrate availability or in longer established plants and seedling swards. This emphasizes the difficulties in establishing consistent differences between species in NRA. Both species showed increased NRA with increased nitrate availability, increased night temperature or decreased day temperature. Agrostis stolonifera increased its NRA to a greater extent than A. tenuis as nitrate availability increased. The importance of daily and developmental variation in NRA in establishing differences between these species is discussed.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.1983.tb03423.x