Changes in lipids and polysaccharides during pollen ontogeny in Oenothera anthers

1992 ◽  
Vol 5 (2) ◽  
pp. 110-116 ◽  
Author(s):  
I. Noher de Halac ◽  
G. Fama ◽  
I. A. Cismondi
Keyword(s):  
Pollen Ontogeny

Pollen ontogeny in Brasenia (Cabombaceae, Nymphaeales)

2006 ◽  
Vol 93 (3) ◽  
pp. 344-356 ◽  
Author(s):  
Mackenzie L Taylor ◽  
Jeffrey M Osborn
Keyword(s):  
Pollen Ontogeny

scholarly journals Male reproductive development: gene expression profiling of maize anther and pollen ontogeny

2008 ◽  
Vol 9 (12) ◽  
pp. R181 ◽  
Author(s):  
Jiong Ma ◽  
David S Skibbe ◽  
John Fernandes ◽  
Virginia Walbot
Keyword(s):  
Gene Expression ◽  
Gene Expression Profiling ◽  
Expression Profiling ◽  
Reproductive Development ◽  
Pollen Ontogeny

Pollen Ontogeny inRuppia(Alismatidae)

2018 ◽  
Vol 179 (3) ◽  
pp. 217-230 ◽  
Author(s):  
Mackenzie L. Taylor ◽  
Kristine M. Altrichter ◽  
Luke B. Aeilts
Keyword(s):  
Pollen Ontogeny

Evidence for silicon as a prevalent elemental component in pollen wall structure

1974 ◽  
Vol 52 (10) ◽  
pp. 2171-2174 ◽  
Author(s):  
Richard E. Crang ◽  
Georgiana May
Keyword(s):  
Tapetal Cell ◽  
Dry Weight ◽  
Pollen Wall ◽  
Wall Structure ◽  
Elemental Silicon ◽  
Pollen Ontogeny ◽  
Elemental Component ◽  
High Degree

Lychnis alba pollen possesses 0.73–0.79% elemental silicon (dry weight), and levels at least as high as in pollen exines have been indicated in tapetal orbicules upon maturation. Even higher levels of elemental silicon (1.30–1.37%) were recorded from Impatiens sultanii pollen. This may indicate that silicon is an important elemental component of exine materials characteristic of many types of pollen, in which silicate compounds may aid in the high degree of pollen resistance to geological weathering, microbial decay, and acetolysis treatments. Further, the data for the incorporation of silicon in L. alba pollen in this report support the concept that exine materials are derived from tapetal cell secretions during pollen ontogeny.

scholarly journals Characterization of a caleosin expressed during olive (Olea europaea L.) pollen ontogeny

2011 ◽  
Vol 11 (1) ◽  
pp. 122 ◽  
Author(s):  
Krzysztof Zienkiewicz ◽  
Agnieszka Zienkiewicz ◽  
María Rodríguez-García ◽  
Antonio J Castro
Keyword(s):  
Olea Europaea ◽  
Olea Europaea L ◽  
Pollen Ontogeny ◽  
Olea Europaéa

Microsporogenesis and microgametogenesis of Cardiospermum grandiflorum and Urvillea chacoensis (Sapindaceae, Paullinieae)

2010 ◽  
Vol 58 (7) ◽  
pp. 597 ◽  
Author(s):  
Stella M. Solís ◽  
Beatriz Galati ◽  
María S. Ferrucci
Keyword(s):  
Electron Microscopy ◽  
Pollen Grains ◽  
Basic Type ◽  
Anther Wall ◽  
Anther Dehiscence ◽  
Transmission Electron ◽  
Pollen Ontogeny ◽  
Tapetal Cells ◽  
The Difference ◽  
Mature Anther

Microsporogenesis and microgametogenesis of two species, Cardiospermum grandiflorum Sw. and Urvillea chacoensis Hunz. (Sapindaceae, Paullinieae), were studied using light and transmission electron microscopy. Both species are monoecious, with staminate and hermaphrodite, although functionally pistillate, flowers. A comparative pollen-development study of these two floral morphs is reported. For the present study, five stages of pollen ontogeny were identified. The development of the anther wall is of basic type. Its wall consists of epidermis, endothecium, two middle layers and a uninucleate secretory tapetum. The microspore tetrads are tetrahedral. The mature anther in staminate flowers presents the endothecium with well developed fibrillar thickenings, remains of tapetal cells, a single locule formed in the theca by dissolution of the septum before anther dehiscence and two-celled pollen grains when shed. In functionally pistillate flowers, the mature anthers present remnants of the middle layers, tapetal cells without signs of degradation, the theca with two locules and pollen grains uni- or bicellular, some of them with the cytoplasm collapsed. These anthers are not dehiscent. It can be concluded that male sterility is characterised by failure to produce functional pollen grains, an event that would be associated with the persistence of tapetal cells. Ultrastructural analysis clearly shows the difference in tapetal cells between the two flower morphs.

scholarly journals Developmental role of the tomato Mediator complex subunit MED18 in pollen ontogeny

2018 ◽  
Vol 96 (2) ◽  
pp. 300-315 ◽  
Author(s):  
Fernando Pérez-Martín ◽  
Fernando J. Yuste-Lisbona ◽  
Benito Pineda ◽  
Begoña García-Sogo ◽  
Iván del Olmo ◽  
...  
Keyword(s):  
Mediator Complex ◽  
Pollen Ontogeny ◽  
Developmental Role
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