Nuclear variations and tapetum polyploidy related to pollen grain development in Passiflora L. (Passifloraceae)

2021 ◽  
Author(s):  
Letícia M. Parteka ◽  
Jorge E. A. Mariath ◽  
André L. L. Vanzela ◽  
Adriano Silvério
Keyword(s):  
Pollen Grain ◽  
Grain Development

scholarly journals Meiosis and pollen grain development in Isolepis cernua f. cernua (Cyperaceae)

Caryologia ◽  
1999 ◽  
Vol 52 (3-4) ◽  
pp. 197-201 ◽  
Author(s):  
L.P. Dopchiz ◽  
L. Poggio
Keyword(s):  
Pollen Grain ◽  
Grain Development

The Ultrastructure of Pollen Grain Development inLycopersicum Peruvianum

Caryologia ◽  
1984 ◽  
Vol 37 (1-2) ◽  
pp. 21-50 ◽  
Author(s):  
Ettore Pacini ◽  
Barrie Juniper
Keyword(s):  
Pollen Grain ◽  
Grain Development

scholarly journals Ultrastructural transformations in the cytoplasm of differentiating Hyacinthus orientalis L. pollen cells

2014 ◽  
Vol 57 (2) ◽  
pp. 235-245 ◽  
Author(s):  
Elżbieta Bednarska
Keyword(s):  
Vegetative Cell ◽  
Generative Cell ◽  
Pollen Grain ◽  
Border Region ◽  
Ultrastructural Changes ◽  
Grain Development ◽  
Callose Wall ◽  
Highly Active ◽  
Hyacinthus Orientalis

The sequence of ultrastructural changes in the cytoplasm during the successive stages of pollen grain development in <em>Hyacinthus orientulis</em> pollen cells was studied. The cytoplasmic transformations of the generative cell included the elimination of plastids, increase in the number of mitochondria, assumption of a spindle shape with the aid of microtubules and the characteristic development of the vacuole system with the formation of so-called colored bodies. The cytoplasmic transformations of the generative cell encompassed changes in the plastids, which began to accumulate starch soon after the cell was formed, then released it shortly before anthesis, an increase in the number of mitochondria and an increase in the number of highly active dictyosomes just before anthesis. Changes in the structure of the border region between the differentiating pollen cells were associated mainly with the periodical appearance of a callose wall and the presence of lysosome-like bodies in the cytoplasm of the vegetative cell surrounding the generative cell. They arose soon after the disappearance of the callose wall and disappeared shortly before anthesis.

Pollen grain development is highly sensitive to temperature stress inVitis vinifera

2014 ◽  
Vol 20 (3) ◽  
pp. 474-484 ◽  
Author(s):  
H.S. Pereira ◽  
M. Delgado ◽  
A.P. Avó ◽  
A. Barão ◽  
I. Serrano ◽  
...  
Keyword(s):  
Temperature Stress ◽  
Pollen Grain ◽  
Grain Development ◽  
Highly Sensitive
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