Abstract:
:Oxygen evolution and energy storage yields in tobacco (Nicotiana tabacum L.) wild-type (cv. John Williams Broadleaf) and a mutant (Su/su) deficient in chlorophyll were compared using the photoacoustic technique. Oxygen-evolution and energy-storage quantum yields in the mutant were higher when measured in red light (640-690 nm) than green or blue light (540 nm and 440 nm, respectively), indicating that carotenoids in this mutant do not transfer energy efficiently to the photochemical reaction centers. It is suggested that carotenoids may play a role in protecting the photosynthetic apparatus against damage by high energy fluxes. In the wild-type, the oxygenevolution yield did not change drastically throughout the visible spectrum. The mutant had a higher quantum yield of oxygen evolution than the wildtype. Similarly maximum rates obtained from saturation curves for the mutant were more than twice higher per leaf area and about five times higher per chlorophyll, as compared to the wild-type.
journal_name
Plantajournal_title
Plantaauthors
Canaani O,Motzan Z,Malkin Sdoi
10.1007/BF00395963subject
Has Abstractpub_date
1985-07-01 00:00:00pages
480-6issue
4eissn
0032-0935issn
1432-2048journal_volume
164pub_type
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