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Effect of Light Intensity on Growth, CO 2 Fixation, and Chlorophyll and Polar Lipid Production in Germinating Polytrichum commune Spores
Author(s) -
KARUNEN PIRJO
Publication year - 1979
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.1399-3054.1979.tb01686.x
Subject(s) - light intensity , chlorophyll , chlorophyll a , protonema , botany , chemistry , horticulture , biology , moss , physics , optics
The dry matter production in Polytrichum commune protonemata was increased when the light intensity was increased from 0 to 160 μE m −2 s −1 , and at 160 μE m −2 s −1 production was about 200% of that found at 17 μE m −2 s −1 . Production of chlorophyll (Chl) was increased by increasing light intensity from 0 to 17 μE m −2 s −1 , but decreasing at light intensities above 17 μE m −2 s −1 . At 160 μE m −2 s −1 the production of Chl was only about 50% of that at 17 μE m −2 s −1 . The rate of CO 2 fixation was low (0.31 μg CO 2 /mg Chi × h) at the light intensity of 17 μE m −2 s −1 as compared with that at 160 μE m −2 s −1 (0.83 μg CO 2 /mg Chi × h). Production of mono‐ (MGDG) and diglycosyl diglycerides (DGDG) was closely associated with that of chlorophylls. At the higher light intensity (160 μE m −2 s −1 ) production of glycolipids was about 60% of that at 17 μE m −2 s −1 . Production of more polar lipids was less affected by light intensity. Light intensity also affected the fatty acid pattern of the lipid fractions. The effect was most pronounced in the MGDG fraction, where the proportion of C 18: 3ω3 + C 16: 3ω3 was higher at the higher light intensity.