Influence of solar UV radiation on the nitrogen metabolism in needles of Scots pine (Pinus sylvestris L.) |
| |
Authors: | Krywult Marek Smykla Jerzy Kinnunen Heli Martz Françoise Sutinen Marja-Liisa Lakkala Kaisa Turunen Minna |
| |
Institution: | Department of Instrumental Analysis, Provincial Sanitary-Epidemiological Station, State Sanitary Inspection, Pradnicka 76, PL-31-202 Kraków, Poland. |
| |
Abstract: | Needles of 20-year-old Scots pine (Pinus sylvestris L.) saplings were studied in an ultraviolet (UV) exclusion field experiment (from 2000 to 2002) in northern Finland (67 °N). The chambers held filters that excluded both UV-B and UV-A, excluded UV-B only, transmitted all UV (control), or lacked filters (ambient). UV-B/UV-A exclusion decreased nitrate reductase (NR) activity of 1-year-old needles of Scots pines compared to the controls. The proportion of free amino acids varied in the range 1.08-1.94% of total proteins, and was significantly higher in needles of saplings grown under UV-B/UV-A exclusion compared to the controls or UV-B exclusion. NR activity correlated with air temperature, indicating a “chamber effect”. The study showed that both UV irradiance and increasing temperature are significant modulators of nitrogen (N) metabolism in Scots pine needles. |
| |
Keywords: | Nitrate reductase Nitrogen metabolism Amino acid Pinus sylvestris Subarctic UV radiation Temperature |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|