Pekka Lähdesmäki , Pekka Pietiläinen

Seasonal variation in the nitrogen metabolism of young Scots pine.

Lähdesmäki P., Pietiläinen P. (1988). Seasonal variation in the nitrogen metabolism of young Scots pine. Silva Fennica vol. 22 no. 3 article id 5356. https://doi.org/10.14214/sf.a15513

Abstract

Seasonal changed in total nitrogen, protein, amino acid, ammonia, nitrate and nitrite concentrations, and nitrate reductase and γ-glutamyltransferase activities in the needles, buds and shoots of young Scots pine (Pinus sylvestris L.) were studied. A relationship between the variation in the nitrogen metabolism and both winter dormancy and its breaking was proposed. Pine tissues stored soluble nitrogen over the winter largely in the form of arginine which, in addition to a high nitrogen content, can neutralize acidic cytoplasmic constituents such as nitrates and nitrites. Specific nitrate reductase and γ-glutamyltransferase activities were highest in late summer or autumn, and is apparently connected to the mobilization of nitrogen reserves for the winter.

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Keywords
Pinus sylvestris; winter dormancy; amino acids; arginine; proteins; nitrate reductase; γ-glutamyltransferase; pine buds and needles; nitrogen metabolism

Published in 1988

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Available at https://doi.org/10.14214/sf.a15513 | Download PDF