scholarly journals Ubisch bodies and pollen ontogeny in Oxalis articulata Savigny

BIOCELL ◽  
2005 ◽  
Vol 29 (3) ◽  
pp. 271-278 ◽  
Author(s):  
SONIA ROSENFELDT ◽  
BEATRIZ G. GALATI
Keyword(s):  
Ubisch Bodies ◽  
Pollen Ontogeny

Ultrastructural aspects of gymnosperms reproductive organs tissues due to their functional condition

1978 ◽  
Vol 36 (2) ◽  
pp. 440-441
Author(s):  
G. M. Kozubov
Keyword(s):  
Metabolic Activity ◽  
Functional Condition ◽  
Reproductive Organs ◽  
Considerable Change ◽  
Complicated Structure ◽  
Tetrad Stage ◽  
Ubisch Bodies ◽  
Similar Organization ◽  
Female Reproductive Organs ◽  
High Metabolic Activity

The ultrastructure of reproductive organs of pine, spruce, larch and ginkgo was investigated. It was found that the male reproductive organs possess similar organization. The most considerable change in the ultrastructure of the microsporocytes occur in meiosis. Sporoderm is being laid at the late tetrad stage. The cells of the male gameto-phyte are distinguished according to the metabolic activity of the or- ganells. They are most weakly developed in the spermiogenic cell. Ta-petum of the gymnosperms is of the periplasmodic - secretorial type. The Ubisch bodies which possess similar structure in the types investigated but are specific in details in different species are produced in tapetum.Parietal and subepidermal layers are distinguished for their high metabolic activity and are capable of the autonomous photosynthesis. Female reproductive organs differ more greatly in their struture and have the most complicated structure in primitive groups. On the first stages of their formation the inner cells of nucellus are transformed into the nucellar tapetum in which the structures similar to the Ubisch bodies taking part in the formation of the sporoderm of female gametophyte have been found.

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

The Ultrastructure and Ontogeny of Pollen in Helleborus Foetidus L

1968 ◽  
Vol 3 (2) ◽  
pp. 161-174
Author(s):  
P. ECHLIN ◽  
H. GODWIN
Keyword(s):  
Cell Wall ◽  
Tapetal Cell ◽  
Pollen Grains ◽  
Ultrastructural Level ◽  
Low Molecular Weight ◽  
Cell Organelles ◽  
Helleborus Foetidus ◽  
Ubisch Bodies ◽  
Ubisch Body ◽  
Development Proceeds

The ontogeny of the tapetum and Ubisch bodies in Helleborus foetidus L. has been examined at the ultrastructural level, and their development has been closely linked with that of the sporogenous cell and pollen grains. During development the tapetum passes through successive phases of synthesis, maturity and senescence, ending in complete dissolution. During the anabolic phase of growth, precursors of the Ubisch bodies are formed as spheroidal vesicles of medium electron density within the tapetal cytoplasm; they are associated with a zone of radiating ribosomes, which, as development proceeds, can clearly be seen to be situated on strands of endoplasmic reticulum. The callose special wall round the microspores and the tapetal cell wall now disintegrate and the pro-Ubisch bodies are extruded through the cell membrance of the tapetal cells, where they remain on the surface of the anther cavity and soon become irregularly coated with sporopollenin. Deposition of sporopollenin continues on the Ubisch bodies at the same time as upon the exines of the developing pollen grains. In both cases, the later stages of sporopollenin deposition are associated with electron-transparent layers of unit-membrane dimensions appearing in section as white lines of uniform thickness. Continuing deposition of sporopollenin leads to the formation of compound or aggregate Ubisch bodies. It is conjectured that the sporopollenin is synthesized from the compounds of low molecular weight released into the anther loculus by the breakdown of the callose special wall and the tapetal cell wall. The final stages of tapetal autolysis involve the disappearance of all the cell organelles. An attempt is made to relate the findings to those described in other recent studies on Ubisch body formation and to combine them in a common ontogenetic pattern.

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.

Role of Ubisch bodies secreted by tapetum in Ca2+ transprot

2000 ◽  
Vol 45 (7) ◽  
pp. 630-634 ◽  
Author(s):  
Xianghong Meng ◽  
Jianbo Wang ◽  
Rongqian Li
Keyword(s):  
Ubisch Bodies

scholarly journals TDR INTERACTING PROTEIN 3 , encoding a PHD ‐finger transcription factor, regulates Ubisch bodies and pollen wall formation in rice

2019 ◽  
Vol 99 (5) ◽  
pp. 844-861 ◽  
Author(s):  
Zhengfu Yang ◽  
Lianping Sun ◽  
Peipei Zhang ◽  
Yingxin Zhang ◽  
Ping Yu ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Pollen Wall ◽  
Interacting Protein ◽  
Phd Finger ◽  
Wall Formation ◽  
Ubisch Bodies
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