Apomixis and Polyembryony in the Guggul Plant, Commiphora wightii. PROMILA GUPTA, K. R. SHIVANNA and H. Y. MOHAN RAM. Department of Botany, Uni. In botany, apomixis was defined by Hans Winkler as replacement of the normal sexual .. “Asynchronous expression of duplicate genes in angiosperms may cause apomixis, bispory, tetraspory, and polyembryony”. Biological Journal of the . Polyembryony is the phenomenon of two or more embryos developing from a single fertilized . “Polyembryony and seedling emergence traits in apomictic citrus”. Scientia Horticulturae. – doi/a
|Published (Last):||20 February 2005|
|PDF File Size:||7.86 Mb|
|ePub File Size:||8.64 Mb|
|Price:||Free* [*Free Regsitration Required]|
Formation of embryo directly from diploid egg without fertilization is called diploid parthenogenesis, e.
Moreover, we tested if polyembryonic apomictic embryos would develop normally into seedlings. Facultative apomixis adn that apomixis does not always occur, i. This article is about plants.
An introduction to the embryology of the angiosperms. An embryo develops directly from a diploid cell other than egg like that of nucellus and integument, e.
Polyembryony and apomixis in Eriotheca pubescens (Malvaceae – Bombacoideae).
This page was last edited on 7 Novemberat A review of the cases and a hypothesis for its evolution”. The term is also used in botany to describe the phenomenon of seedlings emerging from one embryo. The University of Chicago press. Obligately polyembryonic insects fall in two classes: Sign In or Create an Account. Adventitious embryony and apomictic seedlings would explain the mostly clonal populations suggested by molecular studies.
In flowering plants, the term “apomixis” is commonly used in a restricted sense to mean agamospermyi.
Apomixis and Polyembryony in Flowering Plants
There may be more than one egg cell in an embryo sac or more than one embryo sac in an ovule. Thus “normal asexual reproduction ” of plants, such as propagation from cuttings or leaves, has never been considered to be xnd, but replacement of the seed by a plantlet or replacement of the flower by bulbils were categorized as types of apomixis.
Leave a Reply Click here to cancel reply. PlantsReproduction in Plants. From Wikipedia, the free encyclopedia. A more striking example of the use of polyembryony as a competitive reproductive tool is found in the parasitoid Hymenopterafamily Encyrtidae.
Polyembryony – Wikipedia
Significance of Pollen-Pistil Interaction to Plants. An unusual feature of polyemhryony female nine-banded armadillo’s reproductive tract may explain why her litters consist of four genetically identical offspring”.
Textbook of botany Strasburger’s textbook of botany, rewritten. Polyembryony also occurs in Bryozoa. In gametophytic apomixisthe embryo arises from an unfertilized egg cell i.
It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide.
Polyembryony is the phenomenon of two or more embryos developing from a single fertilized egg. Embryologie und Fortpflanzungsbiologie der Angiospermen: The present report is a part of our study on the reproductive biology of a traditional Indian medicinal plant, Commiphora wightiia source of guggul steroids.
In some of these cases stimulus of pollination may be required. Surrogate mother for endangered Cupressus “. Biological Journal of the Linnean Society.
Apogamy is a related term that has had various meanings over time. Embolism resistance in stems of herbaceous Brassicaceae and Asteraceae is linked to differences in woodiness and precipitation.
The genus Citrus has a number polyemryony species that undergo polyembryony, where multiple nucellar-cell-derived embryos exist alongside sexually-derived embryos.