Tapetal Ultrastructural Changes During Pollen Development. I. Studies onAntirrhinum Maius
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Ultrastructural changes in the avian vitelline membrane during embryonic development.
The vitelline (yolk) membrane of the avian egg plays a dual role during early embryonic development; it encloses the yolk and provides a substratum for expansion of the embryo (Fig. 1). Expansion appears to be dependent upon the movement of cells at the edge of the blastoderm which is intimately associated with the inner layer of the vitelline membrane (New, 1959; Bellairs, 1963). The blastoder...
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The development of preparation techniques that include freeze fracturing provide an ideal method for studying the differentiation of plant tissues in the scanning electron microscope. This is illustrated with reference to tapetal development in Catananche caerulea, which has a plasmodial tapetum, and in Lolium perenne, which has a secretory tapetum.
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The Arabidopsis male sterility1 mutation results in mature anthers that are devoid of pollen. Meiosis and early development progress normally; however, after microspore release, the microspore cytoplasm and tapetum become abnormally granular and vacuolated, and degeneration occurs. Pollen wall development is seriously affected; primexine formation within the callose wall appears to occur normal...
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ژورنال
عنوان ژورنال: Caryologia
سال: 1976
ISSN: 0008-7114,2165-5391
DOI: 10.1080/00087114.1976.10796654