Abstract
The CD3 mutation is known to be located in chromosome 7D. CD3 plants were crossed with monosomic ‘Chinese Spring’ plants. The resulting F1 plants were selfed to yield the F2 with varying ratios of dominant to recessive genes. Chlorophyll accumulation increased and the chlorophyll a/b ratio decreased as the dominant to recessive gene ratio increased. With a decrease in dominant genes the electron transport rate increased. This increase was greater at high fluence than at low fluence because of a chlorophyll deficiency. Fluorescence induction curves indicated that it was the electron transport chain that was inhibited in plants with a low dominant to recessive gene ratio. These plants were also more deficient in the light harvesting pigment complexes of photosystem I and photosystem II and in the 110-kDa photosystem I protein than those having a high dominant to recessive gene ratio. As the ratio of dominant to recessive genes decreased, there was a decrease in the number of grana and in the number of thylakoids per granum.
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