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Combined effect of light and temperature on triacylglycerol accumulation in Dicranum elongatum
Author(s) -
Karunen Pirjo,
Hakala Kaija,
Mikola Heikki
Publication year - 1988
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1988.tb00607.x
Subject(s) - subarctic climate , moss , light intensity , biology , zoology , horticulture , botany , chemistry , ecology , physics , optics
In the subarctic moss Dicranum elongatum Schleich & Schwaegr., the level of total lipids and triacylglycerols (TAG) was high in late winter and spring and low in autumn and winter. Four‐week exposure of field material to continuous light (135μmol m −2 s −1 ) at 1°C resulted in a considerable increase in the amount of TAG in the autumn material acclimated to low temperatures and rhythmic light in the field. In contrast, the same treatment did not cause any increase in TAG in the spring material, acclimated to low temperatures and continuous light in the field. Results from experiments, in which moss cultivated for 4 months at 9°C on 12‐h photoperiods (135μmol m −2 s −1 ) was kept for 3 weeks at low temperatures (9°C and −3°C) either in continuous light (135 or 70 μmol m −2 s −1 ) or with 12‐h photoperiods (135 μmol m −2 s −1 ), indicated that the TAG level was higher at higher light intensity. At 9°C it was also higher in continuous light of both intensities than in rhythmic light. These results strongly suggest that decreasing irradiance and decreasing daylength limits the accumulation of TAG in D. elongatum during autumn in the subarctic.