Structural studies of microsporogenesis in fertile and male-sterile onions (Allium cepa L.) containing the cms-S cytoplasm

The structure of anther tissues has been studied during microsporogenesis in male-sterile and -fertile onions. Three types of abnormal tapetal behaviour have been observed within the single line II/3ms containing the cms-S cytoplasm: type 1, the premature breakdown of the tapetum at the tetrad stage...

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Bibliographic Details
Published in:Theoretical and applied genetics 1991-10, Vol.82 (6), p.745-755
Main Authors: Holford, P. (Birmingham Univ. (United Kingdom). School of Biological Sciences), Croft, J.H, Newbury, H.J
Format: Article
Language:English
Subjects:
ALLIUM CEPA
ANALISIS HISTOCITOLOGICO
ANALYSE HISTOCYTOLOGIQUE
Biological and medical sciences
CYTOPLASMIC MALE STERILITY
ELECTRICAL ENGINEERING
ESTERILIDAD MASCULINA CITOPLASMICA
Fundamental and applied biological sciences. Psychology
GAMETOGENESE
GAMETOGENESIS
GENIE ELECTRIQUE
HISTOCYTOLOGICAL ANALYSIS
INGENIERIA ELECTRICA
MICROSCOPIA
MICROSCOPIE
MICROSCOPY
Microsporogenesis
Plant physiology and development
STERILITE MALE CYTOPLASMIQUE
Tissue cultures, protoplasts
Transmission electron microscopy
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Summary:The structure of anther tissues has been studied during microsporogenesis in male-sterile and -fertile onions. Three types of abnormal tapetal behaviour have been observed within the single line II/3ms containing the cms-S cytoplasm: type 1, the premature breakdown of the tapetum at the tetrad stage, type 2, the hypertrophy of the tapetum after the diad stage followed by its premature autolysis and, type 3, in which the tapetum remains in good condition but for an abnormally long period of time. Tapetal autolysis proceeds in the same manner in both male-steriles and -fertiles with only the stage at which it occurs differing between the types of plants. Mitochondria were prominent in the tapetal tissue of all onion types throughout all stages of microsporogenesis and were still visible during the last stages of tapetal autolysis. In a detailed study of type 2 behaviour, no differences in mitochondrial volumes were found until the tapetum hypertrophied.
ISSN:0040-5752
1432-2242
DOI:10.1007/BF00227320