Cytokinesis in Pollen Mother Cells of Angiosperms, with Emphasis on &lt;i&gt;Laurelia novae-zelandiae&lt;/i&gt; (Monimiaceae)

Sampson, F. B.

doi:10.1508/cytologia.34.627

Cited by 37 publications

(29 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, genes controlling 2n gamete formation have been described in only a few plant species; Datura (Satina and Blakeslee 1935), Zea mays (Rhoades and Dempsey 1966), Solanum (Mok and Peloquin 1975) and Medicago sativa (McCoy 1982). Basically two distinct types of cytokinesis have been recognised in angiosperms viz., suc cessive type by cell-plate formation and simultaneous type by construction furrows (Sampson 1969). However, Heslop-Harrison (1971) and Stanley and Linskens (1974) are of the view that cytokinesis in angiosperms takes place by cell-plate formation.…”

Section: Discussionmentioning

confidence: 99%

The mechanism of 2n pollen formation in diploids of Costus speciosus (Koenig) J.E. Smith and role of sexual polyploidization in the origin of intraspecific chromosomal races.

Tyagi

1988

CYTOLOGIA

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

The mechanism of 2n pollen formation in diploids of Costus speciosus (Koenig) J.E. Smith and role of sexual polyploidization in the origin of intraspecific chromosomal races.

Tyagi

1988

CYTOLOGIA

View full text Add to dashboard Cite

“…However, centrifugal cell plate formation has also been recorded in the simultaneous type at the end of meiosis II, e.g., in Hel/eborus (Waterkeyn 1962). Sampson (1969) described these three categories, and Longly and Waterkeyn (1979) further investigated the number and the structure of the cell plates, although absolute differences in the way the divisions occur remain unclear. Which of the two basic types is primitive has been a matter of conjecture.…”

Section: Microsporogenesismentioning

confidence: 99%

Steps Toward a Natural System of the Dicotyledons

Dahlgren¹

1991

aliso

View full text Add to dashboard Cite

Embryological character states are mapped on the diagrams of dicotyledons (G. Dahlgren 1989). The often well-defined pattern of distribution forms a basis for discussing and clarifying phylogenetic relations. It is shown how numerous embryological characters, alone or in combinations, support certain systematic constellations, even if the character states may have arisen independently within a varying number of evolutionary lines. Characters presented are: anther wall formation; tapetum types; cells in pollen grains at dispersal; microsporogenesis; ovule morphology; ovule integuments; endothelium; obturator; parietal tissue; embryo sac formation; antipodal cells; hypostase, embryogeny; polyembryony; endosperm formation; persistence of endosperm; ruminate endosperm; endosperm haustoria; perisperm; storage compounds in the endosperm; chlorophyllous embryo; embryo size, seed coat characters; arils; dry and wet stigma types.

show abstract

“…The existing typological convention for microsporogenesis in angiosperms recognizes two patterns, i.e. simultaneous and successive, although intermediate patterns called modified simultaneous can also been seen (Sampson 1969). The successive division involves the formation of centrifugal cell plates, whereas simultaneous division involves the formation of centripetal furrows, although this may not be always the case (Furness and Rudall 1999).…”

Section: Discussionmentioning

confidence: 99%

Investigation of mitosis, microsporogenesis and pollen germination in the critically endangered plantAmsonia orientalis(Apocynaceae)

2013

View full text Add to dashboard Cite

Amsonia orientalis Decne. (Apocynaceae) is a medically useful and critically endangered plant which has very restricted distribution world-wide. The root tips and flower buds of A. orientalis were used as an experimental material and they were squashed in aceto-orcein. Fresh flowers and a liquid medium were used for pollen germination tests. In spite of the small size of the cells and chromosomes, all phases of mitosis and meiosis were observed. Generally the phases of mitosis were regular but there were a few abnormalities, such as laggard chromosome in metaphase and bridge formation in anaphase. There was a good relationship between the stages of pollen development and floral bud length. As a result of the cytokinesis, tetrahedral types of tetrads were occurred in microsporogenesis. The tetrad nuclei resulting from the simultaneous type of meiosis were found to be of equal size. Pollen germination had started from the first hour and pollen tube lengths and germination percentages regularly increased with increasing time. This is the first study that identifies mitotic and meiotic cycles and pollen germination in A. orientalis. Our findings about the mitosis and reproduction biology of this critically endangered plant will be useful for in vitro and in situ conservation, taxonomic and genetic studies.

show abstract

Cytokinesis in Pollen Mother Cells of Angiosperms, with Emphasis on <i>Laurelia novae-zelandiae</i> (Monimiaceae)

Cited by 37 publications

References 9 publications

The mechanism of 2n pollen formation in diploids of Costus speciosus (Koenig) J.E. Smith and role of sexual polyploidization in the origin of intraspecific chromosomal races.

The mechanism of 2n pollen formation in diploids of Costus speciosus (Koenig) J.E. Smith and role of sexual polyploidization in the origin of intraspecific chromosomal races.

Steps Toward a Natural System of the Dicotyledons

Investigation of mitosis, microsporogenesis and pollen germination in the critically endangered plantAmsonia orientalis(Apocynaceae)

Contact Info

Product

Resources

About