Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 271-6 |
| Seitenumfang | 6 |
| Fachzeitschrift | IUBMB LIFE |
| Jahrgang | 48 |
| Ausgabenummer | 3 |
| Publikationsstatus | Veröffentlicht - Sept. 1999 |
| Extern publiziert | Ja |
Abstract
Two photosystems, I and II, absorb and convert light energy in photosynthesis in chloroplasts of green plants. The genes psbA and psaAB of the cytoplasmic chloroplast genome encode core components of photosystem II and photosystem I, respectively. Here we show that the absolute amounts of photosystem I and photosystem II respond, in a complementary manner, to changes in light quality that preferentially excite each photosystem in mustard seedlings. We also show that the initial response to altered energy distribution is a change in the rates of transcription of psbA and psaAB. Changes in chlorophyll fluorescence emission in vivo suggest that the signal initiating this change is the oxidation-reduction state of plastoquinone, a component of the photosynthetic electron transport chain that connects photosystem I and photosystem II. The results are consistent with transcriptional effects observed previously with chloroplasts isolated in vitro and demonstrate that redox control of chloroplast transcription initiates long-term adjustments that compensate for imbalance in energy distribution and adapt the whole plant to altered light environments.
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in: IUBMB LIFE, Jahrgang 48, Nr. 3, 09.1999, S. 271-6.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Direct transcriptional control of the chloroplast genes psbA and psaAB adjusts photosynthesis to light energy distribution in plants
AU - Pfannschmidt, T
AU - Nilsson, A
AU - Tullberg, A
AU - Link, G
AU - Allen, J F
PY - 1999/9
Y1 - 1999/9
N2 - Two photosystems, I and II, absorb and convert light energy in photosynthesis in chloroplasts of green plants. The genes psbA and psaAB of the cytoplasmic chloroplast genome encode core components of photosystem II and photosystem I, respectively. Here we show that the absolute amounts of photosystem I and photosystem II respond, in a complementary manner, to changes in light quality that preferentially excite each photosystem in mustard seedlings. We also show that the initial response to altered energy distribution is a change in the rates of transcription of psbA and psaAB. Changes in chlorophyll fluorescence emission in vivo suggest that the signal initiating this change is the oxidation-reduction state of plastoquinone, a component of the photosynthetic electron transport chain that connects photosystem I and photosystem II. The results are consistent with transcriptional effects observed previously with chloroplasts isolated in vitro and demonstrate that redox control of chloroplast transcription initiates long-term adjustments that compensate for imbalance in energy distribution and adapt the whole plant to altered light environments.
AB - Two photosystems, I and II, absorb and convert light energy in photosynthesis in chloroplasts of green plants. The genes psbA and psaAB of the cytoplasmic chloroplast genome encode core components of photosystem II and photosystem I, respectively. Here we show that the absolute amounts of photosystem I and photosystem II respond, in a complementary manner, to changes in light quality that preferentially excite each photosystem in mustard seedlings. We also show that the initial response to altered energy distribution is a change in the rates of transcription of psbA and psaAB. Changes in chlorophyll fluorescence emission in vivo suggest that the signal initiating this change is the oxidation-reduction state of plastoquinone, a component of the photosynthetic electron transport chain that connects photosystem I and photosystem II. The results are consistent with transcriptional effects observed previously with chloroplasts isolated in vitro and demonstrate that redox control of chloroplast transcription initiates long-term adjustments that compensate for imbalance in energy distribution and adapt the whole plant to altered light environments.
KW - Chloroplasts/physiology
KW - Gene Expression Regulation, Plant/physiology
KW - Light
KW - Light-Harvesting Protein Complexes
KW - Photosynthesis/genetics
KW - Photosynthetic Reaction Center Complex Proteins/genetics
KW - Photosystem I Protein Complex
KW - Photosystem II Protein Complex
KW - Plant Physiological Phenomena
KW - Plant Proteins/genetics
KW - Transcription, Genetic
U2 - 10.1080/713803507
DO - 10.1080/713803507
M3 - Article
C2 - 10690637
VL - 48
SP - 271
EP - 276
JO - IUBMB LIFE
JF - IUBMB LIFE
SN - 1521-6543
IS - 3
ER -