Title: Photoinhibition, xanthophyll cycle and in vivo chlorophyll fluorescence quenching of chilling‐tolerant <i>Oxyria digyna</i> and chilling‐sensitive <i>Zea mays</i>
Abstract: The relationship between susceptibility to photoinhibition, zeaxanthin formation and chlorophyll fluorescence quenching at suboptimal temperatures was studied in chilling‐sensitive maize and in non‐acclimated and cold‐acclimated Oxyria digyna , a chilling‐tolerant plant of arctic and alpine habitats. In maize, zeaxanthin formation was strongly suppressed by chilling. Zeaxanthin formed during preillumination at 20°C did not protect maize leaves from photoinhibition during a subsequent high‐light, low‐temperature treatment, as judged from the ratios of variable to maximal fluorescence, F v /F m . However, such preillumination significantly increased non‐photochemical quenching (q N ) at low temperatures, mainly due to an enhancement of the fast‐relaxing q N component (i.e., of energy‐dependent quenching. q E ). In O. digyna , cold‐acclimation resulted in an increased zeaxanthin formation in the temperature range of 2.5–20°C. Cold‐acclimation substantially decreased the susceptibility towards photoinhibition at 4°C, but q N remained nearly unchanged between 2 and 38°C, as compared to control plants. Effects of cold acclimation on photosynthesis, photochemical quenching and quantum efficiency of photosystem II were small and indicated a slight amelioration only of the function of the photosynthetic apparatus at suboptimal temperatures (2–20°Ct. I) is concluded, that the xanthophyll cycle is strongly influenced by cold acclimation, while effects on the photosynthetic carbon assimilation only play a minor role in O. digyna.
Publication Year: 1994
Publication Date: 1994-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 49
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