ISSN:
1615-6102
Keywords:
Bangia
;
Differentiation
;
Organelles
;
Rhodophyta
;
Spermatiogenesis
;
Ultrastructural transformation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary The major organelles within the cells of maleBangia atropurpurea (Roth) C. Ag. filaments undergo a series of ultrastructural transformations during the production of spermatia. Initially, thylakoids within the large axial chloroplast develop a reticulate pattern commencing at the central pyrenoid region. Subsequent changes involve loss of lobes and diminution of volume through division; chloroplasts in final stages contain a few dilated, distorted thylakoids and many plastoglobuli. During differentiation the large nucleolus disappears from the nucleus and four masses of chromatin aggregate near the nuclear envelope. Furrows originating from the nuclear envelope form double membranes around each of the chromatin masses and most of the nucleoplasm is eliminated. Several types of fibrillar vesicles are formed during the process and large floridean starch reserves are utilized. Multilamellar bodies and microbody-like structures occur within the cells during certain phases of spermatiogenesis.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01279591
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