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The role of calcium in blue-light-dependent chloroplast movement in Lemna trisulca L. by Monika Tlałka; Mark Fricker is a Agricultural and Biological Sciences article available to read on EtoBox.

What is The role of calcium in blue-light-dependent chloroplast movement in Lemna trisulca L. about?

Chloroplast movements are a normal physiological response to changes in light intensity and provide a good model system to analyse the signal transduction pathways following light perception. Blue-light-dependent chloroplast movements were observed in Lemna trisulca using confocal optical sectioning and 3-D reconstruction or photometric measurements of leaf transmission. Chloroplasts moved away from strong blue light (SBL) towards the anticlinal walls (profile position), and towards the periclinal walls (face position) under weak blue light (WBL) over about 20-40 min. Cytoplasmic calcium ([Ca2 + ]cyt) forms part of the signalling system in response to SBL as movements were associated with small increases in [Ca2 + ]cyt and were blocked by antagonists of calcium homeostasis, including EGTA, nifedipine, verapamil, caffeine, thapsigargin, TFP (trifluoperazine), W7 and compound 48/80. Treatments predicted to affect internal Ca2 + stores gave the most rapid and pronounced effects. In addition, artificially increasing [Ca2 + ]cyt in darkness using the Ca2 + ionophore A23187 and high external Ca2 + (or Sr2 + ), triggered partial movement of chloroplasts to profile position analogous to a

Who reads The role of calcium in blue-light-dependent chloroplast movement in Lemna trisulca L.?

Author

Monika Tlałka; Mark Fricker

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0960-7412)

Published

1999

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)