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The Stimulating Effect of a Cold Dark Pretreatment on the Accumulation of Components of Light‐Harvesting Chlorophyll a / b Complexes and on Photosynthetic Activity in Wheat ( Triticum aestivum )
Author(s) -
Zwicker H.G.,
Schulz R.,
Schönbohm E.
Publication year - 1993
Publication title -
botanica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0932-8629
DOI - 10.1111/j.1438-8677.1993.tb00763.x
Subject(s) - etiolation , photosynthesis , xanthophyll , chlorophyll fluorescence , chlorophyll , botany , photosystem , chemistry , kinetics , pigment , quenching (fluorescence) , chlorophyll a , horticulture , fluorescence , photosystem ii , biology , biochemistry , physics , organic chemistry , quantum mechanics , enzyme
Recently we reported on the stimulating effect of a cold dark pretreatment (cold‐dp) on the chlorophyll accumulation (Schönbohm et al., 1988) and on the CO 2 ‐ and O 2 ‐gas exchange (Schönbohm and Czeska‐Werner, 1990) during de‐etiolation of wheat leaves under white light. The goal of the present paper was to study the effect of a cold‐dp on the accumulation of chloroplast pigments, on the kinetics of fluorescence quenching, on the synthesis of Cab ‐proteins and on the amounts of cab ‐transcripts during de‐etiolation under white light. The following results were obtained:1 Not only the chlorophyll synthesis but also the synthesis of xanthophylls and of β‐carotene is highly increased by a cold‐dp. 2 The kinetics of the PAM‐fluorescence curves demonstrate that the activity and co‐operation of the two photosystems start earlier and with higher efficiency during de‐etiolation in cold‐dp than in warm‐dp wheat leaves. 3 The amount of cab ‐transcripts can be elevated by a cold‐dp. 4 The amount of Cab ‐proteins during de‐etiolation is much higher in cold‐dp than in warm‐dp wheat leaves.The presented data are in accordance with our earlier published results. Consequences of these results on seedlings growing under natural conditions with fluctuating temperatures during day and night are pointed out.