Development of the pollen grain wall: Further work withTradescantia bracteata

PROTOPLASMA ◽  
1970 ◽  
Vol 71 (1-2) ◽  
pp. 39-54 ◽  
Author(s):  
R. H. Mepham
Keyword(s):  
Pollen Grain ◽  
Pollen Grain Wall

Anatomy of the Unpollinated and Pollinated Watermelon Stigma

1982 ◽  
Vol 54 (1) ◽  
pp. 341-355
Author(s):  
M. SEDGLEY
Keyword(s):  
Electron Microscopy ◽  
Endoplasmic Reticulum ◽  
Light And Electron Microscopy ◽  
Freeze Fracture ◽  
Pollen Grain ◽  
Acidic Polysaccharides ◽  
Before And After ◽  
Em Autoradiography ◽  
Pollen Grain Wall ◽  
Stigma Secretion

The structure of the watermelon stigma before and after pollination was studied using light and electron microscopy, freeze-fracture and autoradiography. The wall thickenings of the papilla transfer cells contained callose and their presence prior to pollination was confirmed using EM-autoradiography, freeze-fracture and fixation. No further callose thickenings were produced following pollination. Pollination resulted in a rapid increase in aqueous stigma secretion and localized disruption of the cuticle, which appeared to remain on the surface of the secretion. Autolysis of the papilla cells, which had commenced prior to pollination, was accelerated and appeared to take place via cup-shaped vacuoles developed from distended endoplasmic reticulum. The reaction was localized to the papilla cells adjacent to the pollen tube only. Both pollen-grain wall and stigma secretion contained proteins, carbohydrates, acidic polysaccharides, lipids and phenolics.

Coenocytism, ameiosis, and chromosome diminution in intergeneric hybrids in the perennial Triticeae

Genome ◽  
1988 ◽  
Vol 30 (5) ◽  
pp. 766-775 ◽  
Author(s):  
Richard R.-C. Wang
Keyword(s):  
Intergeneric Hybrid ◽  
Chromosome Elimination ◽  
Intergeneric Hybrids ◽  
Pollen Grain ◽  
Unreduced Gamete ◽  
Pollen Mother Cells ◽  
Psathyrostachys Juncea ◽  
Hybrid Plants ◽  
Mother Cells ◽  
Pollen Grain Wall

Three different pathways of ameiotic microsporogenesis were observed in some intergeneric hybrids of the perennial Triticeae grasses. In one of the hybrids between Pseudoroegneria spicata ssp. inermis and Psathyrostachys juncea, pollen mother cells remained as premeiotic interphase cells when the pollen grain wall started to form. The microspores in such an ameiotic plant are presumably unreduced. Coenocyte formation coupled with ameiosis occurred in two hybrid plants of Psathyrostachys huashanica × Secale montanum. Less than 10% of the pollen mother cells had one nucleus. An average of 4.44 nuclei, ranging from 1 to 25 per pollen mother cell, was observed. The nuclei in coenocytes remained unfused when the pollen grain wall was formed. Nucleus splitting followed by cytoplasmic budding or cleavage, possibly a process of chromosome diminution or elimination, replaced meiotic divisions in most of the pollen mother cells in one plant of Leymus angustus × Hordeum bulbosum and two plants of Thinopyrum elongatum × Psathyrostachys juncea. It is evident that these meiotic abnormalities are under genetic control. Probable locations for these genes controlling these phenomena are suggested.Key words: coenocyte, ameiosis, chromosome diminution, chromosome elimination, microsporogenesis, unreduced gamete, polyploidy, intergeneric hybrid.

Localization of Antigens associated with the Pollen Grain Wall by Immunofluorescence

Nature ◽  
1970 ◽  
Vol 225 (5237) ◽  
pp. 1066-1068 ◽  
Author(s):  
R. B. KNOX ◽  
J. HESLOP-HARRISON ◽  
C. REED
Keyword(s):  
Pollen Grain ◽  
Pollen Grain Wall

scholarly journals A Route for the Transfer of Materials Through the Pollen Grain Wall

1959 ◽  
Vol 6 (3) ◽  
pp. 537-538 ◽  
Author(s):  
J. R. Rowley ◽  
K. Mühlethaler ◽  
A. Frey-Wyssling
Keyword(s):  
Pollen Grain ◽  
Pollen Grain Wall

Pollen grain wall structure ofCaytonanthus arberi (Caytoniales)

1986 ◽  
Vol 153 (3-4) ◽  
pp. 259-264 ◽  
Author(s):  
Michael S. Zavada ◽  
William L. Crepet
Keyword(s):  
Pollen Grain ◽  
Wall Structure ◽  
Pollen Grain Wall

The development of the pollen grain wall in Ipomoea purpurea (L.) Roth

1967 ◽  
Vol 3 (1-4) ◽  
pp. 181-195 ◽  
Author(s):  
H. Godwin ◽  
P. Echlin ◽  
B. Chapman
Keyword(s):  
Pollen Grain ◽  
Ipomoea Purpurea ◽  
Pollen Grain Wall

scholarly journals Radioautographic visualization of incorporation of lipid precursors into anthers of Muscari comosum (L.) Mili.

2015 ◽  
Vol 46 (2) ◽  
pp. 295-302 ◽  
Author(s):  
Barbara Gabara
Keyword(s):  
Acetic Acid ◽  
Palmitic Acid ◽  
Developmental Stages ◽  
Mevalonic Acid ◽  
Pollen Grains ◽  
Pollen Grain ◽  
Tetrad Stage ◽  
Lipid Precursor ◽  
Mother Cells ◽  
Pollen Grain Wall

Incorporation of the following lipid precursors: DL-mevalonic acid-2 <sup>3</sup>H, <sup>3</sup>H palmitic acid and acetic acid-<sup>3</sup>H sodium salt, into the anther cells of <i>Muscari comosum</i> (L.) Mili. has been investigated. These lipid precursors have been demonstrated to incorporate into pollen mother cells, pollen grains and the tapetum at the consecutive developmental stages. Ali used isotopes are incorporated into the cytoplasm of these cells and in the case of pollen grain the radioactivity of pollen grain wall (mainly composed of sporopellenin) is noticed. The highest radioactivity of pollen grain wall is observed after acetic acid, the lower one after palmitic acid, whereas the lowest uptake of lipid precursor occurs after mevalonic acid. In comparison with tetrad stage the distinct inrease of the cytoplasmic radioactivity of tapetum, which appears to1 accompany the labelling of pollen grain wall, seems to indicate the participation of tapetum in the formation of exine. A possible role of Ubisch bodies in the formation of pollen grain wall is discussed.

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