Summary
The concentration of lipophilic plastid quinones (plastoquinone, plastoquinol, α-tocopherol, α-tocoquinone) in the C4-plants Zea mays and Atriplex rosea is lower than in the already studied C3-plants.
In Zea mays the concentration of plastid quinones increases only a little with the age of the plant and then decreases again, while the concentration of quinones in Atriplex rosea constantly rises during the whole test period of 10 weeks.
The ratio of chlorophyll a:b is 3,5 in Zea mays and 3,6 in Atriplex rosea.
The data lead to the supposition that the concentration of photosystem-II-components is lower than the concentration of photosystem-I-components. We assume that especially in the bundle sheath chloroplasts there is a lack of quinones. In the case of Zea mays this could be the reason for the low system-II-activity which has been found by Anderson et al. (1971).
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Abbreviations
- Chl:
-
Chlorophyll
- Car:
-
Carotinoide
- PQ 45:
-
Plastochinon
- PQH2 45:
-
Plastohydrochinon
- α-T:
-
α-Tocopherol
- α-TQ:
-
α-Tocochinon
Literatur
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Wild, A., Conrad, G. & Zickler, HO. Der Gehalt an Plastidenchinonen und Pigmenten von Zea mays und Atriplex rosea in Abhängigkeit von der Lichtintensität und dem Alter der Pflanzen. Planta 103, 181–187 (1972). https://doi.org/10.1007/BF00387369
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DOI: https://doi.org/10.1007/BF00387369