, Volume 167, Issue 1, pp 19–32

Scale biogenesis in the green alga,Mesostigma viride


  • D. S. Domozych
    • Department of BiologySkidmore College
  • B. Wells
    • Department of Cell BiologyJohn Innes Institute for Plant Science Research
  • P. J. Shaw
    • Department of Cell BiologyJohn Innes Institute for Plant Science Research
Original Papers

DOI: 10.1007/BF01353577

Cite this article as:
Domozych, D.S., Wells, B. & Shaw, P.J. Protoplasma (1992) 167: 19. doi:10.1007/BF01353577


The unicellular green algal flagellate,Mesostigma viride, is characterized by an extracellular matrix of multiple layers of scales. These scales are processed within the Golgi apparatus (GA). The GA consists of 11–13 closely stacked cisternae. The cis cisternae are highly fenestrated and grow via vesicles from adjacent transition ER. Medial-trans cisternae are plate-like with swollen peripheries. The calcified basket scales are produced in the peripheries of GA cisternae, usually first observable in the medial zone of the cisternal stack. Cisternal membrane closely conforms to the precise architecture of the developing scale. Antimonate labeling reveals that a population of smooth cytoplasmic vacuoles situated near the GA contains a store of calcium, perhaps used for scale processing. Vesicles carry calcium from these vacuoles to the cisternal loci where basket scale ontogenesis is occurring. The smaller scale types are produced within the central areas of the GA. A discussion concerning membrane flow through the GA is provided.


ScalesGolgi apparatusVacuoleCalciumVesicle

Copyright information

© Springer-Verlag 1992