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The relationship between tonicity and flagellar length

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Abstract

THE manner in which a cell regulates the size and number of its organelles is not fully understood. We have studied the regulation of flagellar length. Flagella are organelles involved in cellular motility and sensory transduction1, and in standardised conditions, the flagella of a given species are constant in length and number. Thus, taxonomists include these characteristics in species descriptions2. The organism we are investigating is the unicellular biflagellate green alga Chlamydomonas reinhardi, in which the two flagella are of equal length2. If the flagella of Chlamydomonas are amputated, they regenerate to their original length in approximately 90 min (ref. 3). If only one flagellum is removed the remaining organelle shrinks while the new flagellum is elongating, until both are of the same length. At this point both organelles proceed to elongate, stopping when the normal length is reached3,4. Resorption of organelles containing microtubules has been shown to occur under a number of conditions in different organisms5. Recently it has been shown that the flagella of Chlamydomonas can be caused to shorten by a variety of agents such as pyrophosphate6–8, chelators6, halo-thane9 and other salt solutions6,10,11. This large variety of substances led us to study the effects of tonicity, per se, on flagellar length.

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Authors and Affiliations

  1. Department of Biological Sciences, University of California, Santa Barbara, California, 93106

    KENNETH M. SOLTER & AHARON GIBOR

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  1. KENNETH M. SOLTER
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  2. AHARON GIBOR
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SOLTER, K., GIBOR, A. The relationship between tonicity and flagellar length. Nature 275, 651–652 (1978). https://doi.org/10.1038/275651a0

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