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1987 (1)
1Author    JackD. Ekker, Barbara WestfallRequires cookie*
 Title    A Temporal Phase Mutation of Chlorophyll Fluorescence in Triazine-Resistant Brassica napus  
 Abstract    The objectives o f this study were to determ ine if there were variations in triazine-resistant and -susceptible Brassica napus leaf disc chlorophyll fluorescence (LCF) intensity in terms of: age of leaf on the plant and time o f day. In growth room and field experim ents triazine-susceptible B. napus cv. "T ow er", and triazine-resistant B. napus cv. "O A C Triton" were used. Chlorophyll fluorescence intensity m easurem ents were made 30 min after disc removal. In both environm ents, two periods o f reduced photosynthetic efficiency occurred in the diurnal. The tim es that these periods occurred during the diurnal differed between biotypes. A phase shift in LCF maxima betw een resistant and susceptible biotypes resulted in two periods, early and late in the light period o f the diurnal, o f increased LCF in resistant tissue. This differential pattern in LCF is support for the hypothesis that triazine resistance chloroplast alterations could imply an alteration in the temporal organization o f chloroplast physiological function. 
  Reference    Z. Naturforsch. 42c, 775 (1987); received Novem ber 11 1986 
  Published    1987 
  Keywords    C hronobiology, Chronoresistance, Chronomutant, Circadian Clock, R apeseed, Photosynthetic Electron Transport 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-0775.pdf 
 Identifier    ZNC-1987-42c-0775 
 Volume    42