ISSN:
1550-7408
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Electron and fluorescence microscopy reveal a proplastid about 1 μ in diameter in dark-grown Euglena gracilis quite like those in higher plants. After the cells are placed in the light these structures lengthen, probably in part by coalescence of several proplastids. Full size is reached in some cells after about one day in light. Lamellae, growing as blebs off the inner proplastid membrane, develop in a roughly linear fashion with time, art average of one new lamella appearing after each 6 hours in the light. The maturation of the proplastid thus appears to differ appreciably from that in higher plants since the latter presumably create several lamellae simultaneously, and these appear able to replicate themselves in a geometrically parallel fashion. The question is raised whether the apparent differences in development may not be due to lesser discrimination in observing the sequence in the higher plants, for there are no observations necessarily inconsistent with the sequence found in Euglena.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1550-7408.1961.tb01238.x
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