Development of Photochemical Activity and the Appearance of the High Potential Form of Cytochrome b-559 in Greening Barley Seedlings |
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| Authors: | Henningsen K W Boardman N K |
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| Affiliation: | Division of Plant Industry, Commonwealth Scientific and Industrial Research Organization, Canberra 2601, Australia. |
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| Abstract: | The development of photochemical activity during the greening of dark-grown barley seedlings (Hordeum vulgare L. cv. Svalöfs Bonus) was studied in relation to the formation of the high potential form of cytochrome b-559 (cytochrome b-559HP). Photosynthetic oxygen evolution from leaves was detected at 30 minutes of illumination. The rate of oxygen evolution per gram fresh weight of leaf was as high at 2 to 2.5 hours of greening as at 24 hours or in fully greened leaves. On a chlorophyll basis, the photosynthetic rate at 90 minutes of greening was 80-fold greater than the rate at 45 hours. It is concluded that the majority of photosynthetic units are functional at an early stage of greening, and that chlorophyll synthesis during greening serves to increase the size of the units. |
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