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Fatty acid desaturation in monogalactosyldiacylglycerol of Brassica napus leaves during low temperature acclimation
Author(s) -
Williams John P.,
Khan Mobashsher U.,
Wong Doris
Publication year - 1996
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.1399-3054.1996.tb00211.x
Subject(s) - brassica , fatty acid , acclimatization , botany , biology , chemistry , food science , biochemistry
Brassica napus plants grown at 5°C have the potential to desaturate fatty acids in the major membrane diacylglycerols of leaves at rates much higher than those of plants grown at 30°C. This low temperature‐induced desaturation (LTD) is rapidly deactivated if plants grown at 5°C are transferred to 30°C for several hours. By exposure to 14 CO 2 and a computer simulation program, we estimated the rate of desaturation of monogalactosyldiacylglycerol by (ω9‐, ω6‐ and ω3‐desaturases of plants grown at 5, 10, 20 and 30°C. Data show that LTD can be induced in mature leaves of plants grown at 20 and 30°C after transfer to 5°C. Full activation of LTD takes several weeks and occurs more rapidly in plants grown at 20°C than 30°C. This activation is largely due to the increased activity of ω9‐ and ω6‐desaturases on C16 fatty acids and ω6‐desaturase on C18 fatty acids.