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Nuclear Deoxyribonucleic Acid Metabolism and Membrane Fatty Acid Content Related to Chilling Resistance in Germinating Cotton ( Gossypium barbadense )
Author(s) -
CLAY WILLARD F.,
BARTKOWSKI EDMUND J.,
KATTERMAN FRANK R. H.
Publication year - 1976
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.1399-3054.1976.tb03985.x
Subject(s) - gossypium barbadense , germination , fatty acid , nuclear dna , gossypium hirsutum , dna damage , biology , dna , gossypium , nuclear membrane , polymerase , horticulture , chemistry , membrane , biochemistry , botany , gene , mitochondrial dna
Chilling damage was examined in the chilling‐sensitive plant Gossypium barbadense . Between 30 and 36 h of germination at 34°C, the seedlings are extremely sensitive to temperatures below 10°C. The initiation of chilling damage by exposure to 2°C for 5 h during the sensitive period resulted in a large reduction in DNA synthesis. The reduction was correlated with a reduced efficiency of nuclear DNA polymerase activity. Comparing a more chilling resistant genotype to a more sensitive variety indicated that the resistant genotype nuclear DNA polymerase activity is more efficient when exposed to a chilling stress. Resistance was also correlated with a higher degree of unsaturated fatty acid content in the nuclear membranes of the resistant variety.