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ON THE SIGNAL-TRANSDUCTION CHAINS OF TWO Pfr- MEDIATED SHORT-TERM PROCESSES: INCREASE OF ANCHORAGE and MOVEMENT OF Mougeotia CHLOROPLASTS 总被引:1,自引:0,他引:1
Ekkehard Schonbohm Elfriede Schönbohm Jens Meyer-Wegener 《Photochemistry and photobiology》1990,52(1):203-209
Abstract— We examined two published hypotheses on the signal-transduction chain of the light-oriented chloroplast movements in the fresh-water alga Mougeotia. One hypothesis postulates a Ca2 +-influx controlled by a tetrapolar gradient of phytochrome in its far-red light absorbing form (Pfr). The other hypothesis postulates anchorage sites for actin-filaments even at those areas of the plasmalemma where phytochrome is in its inactive form (Pr). Calmodulin and Ca2 +-sequestering vesicles are assumed to be essential links of this transduction chain.
To test these hypotheses we have studied the effects of Ca2 +-entry blockers, Ca2 + deficiency and calmodulin antagonists on chloroplast movements and on chloroplast anchorage. None of our results support the Ca2 +/calmodulin hypotheses mentioned above. The results and their implications (with regard to the role of Ca2 ', calmodulin and anchorage sites) are discussed. 相似文献
To test these hypotheses we have studied the effects of Ca
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