Changes in the activities of nitrogen assimilation enzymes ofLolium perenne L. during regrowth after cutting View Full Text


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Article Info

DATE

1989-02

AUTHORS

J. Boucaud, J. Bigot

ABSTRACT

The activities of key enzymes involved in N assimilation were investigated after defoliation of 6-week-old ryegrass plants grown in water culture conditions. In a first experiment, nitrate reductase, glutamine synthetase and glutamate dehydrogenase activities were measured in roots, stubble and leaves on the day of cutting and at 7-day intervals over the following 5-week period of regrowth. Ammonia assimilation enzymes showed little change whereas the nitrate reductase activity sharply decreased 2 weeks after clipping. In a second experiment, the nitrate reductase activity was measured at 2- or 3-day intervals 1 week before and 3 weeks after clipping.In vivo andin vitro assays both showed an increasing activity in leaves up to 8 days after cutting while root activity decreased. The opposite changes then occurred and both organs recovered their initial nitrate reductase activity levels after 12–14 days of regrowth. These fluctuations in nitrate reductase activity were considered to be related to the capacity for C assimilation and the nitrate availability. More... »

PAGES

121-125

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02203089

DOI

http://dx.doi.org/10.1007/bf02203089

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1003158385


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