Abstract
The relative amounts of chlorophyll b (Cb) and various chlorophyll a (Ca) forms in nine plant species were determined by computer analysis of low-temperature absorption spectra. The results show that (a) the amount of Cb is inversely related to the sum of the amounts of the bulk Ca from both photosystems, (b) a direct correlation is likely to occur between the amounts of Cb and the Ca bands peaking around 685 nm and 640 nm, and (c) no correlation exists between the amounts of Cb and the Ca662 and Ca695 forms. These data are interpreted to suggest that Cb is capable of taking over the antenna function of the bulk Ca, whereas it may occur in a complex carrying the Ca685 form as well.
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