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Monday, May 18, 2020 | History

1 edition of Apomixis and its role in evolution and breeding found in the catalog.

Apomixis and its role in evolution and breeding

Apomixis and its role in evolution and breeding

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  • 32 Currently reading

Published by Oxonian Press in New Delhi .
Written in English

    Subjects:
  • Plant breeding.,
  • Apomixis -- Plant genetics.,
  • Plants -- Evolution.,
  • Parthenogenesis in animals.,
  • Parthenogenesis in plants.

  • Edition Notes

    Statementeditor-in-chief, D.F. Petrov.
    ContributionsPetrov, Dmitriĭ Fedorovich.
    Classifications
    LC ClassificationsSB123 .A65 1984
    The Physical Object
    Paginationviii, 267 p. :
    Number of Pages267
    ID Numbers
    Open LibraryOL3007670M
    LC Control Number84901217

    The term apomixis encompasses a suite of processes whereby seeds form asexually in plants. In contrast to sexual reproduction, seedlings arising from apomixis retain the genotype of the maternal parent. The transfer of apomixis and its effective utilization in crop plants (where it is largely absent) has major advantages in agriculture. The hallmark components of apomixis include female gamete. In discussions of the benefits genetic engineering can bring to small farmers, proponents love to point to apomixis - the production of cloned seed. This article examines apomixis research, and the main implications that transferring apomixis into crops may have for industry, farmers and the environment. It also looks at how the apomixis research agenda is being up led by the private sector.

      Apomixis Mechanisms. In contrast to sexual seed formation, apomixis can occur by various mechanisms that share three common developmental components: (i) a bypass of meiosis during embryo sac formation (apomeiosis), (ii) development of an embryo independent of fertilization (a process known as parthenogenesis), and (iii) formation of viable endosperm either via fertilization-independent Cited by:   1. Apomixis and its Application for crop improvement. PRESENTED BY: Pawan Nagar Reg. no.: (Fruit Science) 2. Apomixis refers to the development of seed without sexual fusion (fertilization). In apomixis embryo develops without fertilization. Thus apomixis is an asexual means of reproduction. 3.

    Define apomixis. apomixis synonyms, apomixis pronunciation, apomixis translation, English dictionary definition of apomixis. Traditional breeding based on the drought tolerance has been always the important strategy in citrus, but it is much more time-consuming because of .   For the buffelgrass plant discovered in a Texas pecan orchard about 30 years ago gave Bashaw, a U.S. Department of Agriculture plant geneticist, a way to use a trait called apomixis in plant breeding. The word apomixis (pronounced AP-o-MIX-sis) comes from the Greek apo (from) and mixis (a mingling). It is sexual reproduction through seed.


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Apomixis and its role in evolution and breeding Download PDF EPUB FB2

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Apomixis and Its Role in Evolution and Breed 1st Edition. by D. Petrov (Editor) ISBN ISBN X. Why is ISBN important. ISBN. This bar-code number lets you verify that you're getting exactly the right version or edition of a Author: D.

Petrov. In botany, apomixis was defined by Hans Winkler as replacement of the normal sexual reproduction by asexual reproduction, without fertilization. Its etymology is Greek for "away from" + "mixing". This definition notably does not mention "normal asexual reproduction" of plants, such as propagation from cuttings or leaves, has never been considered to be apomixis, but replacement of.

Book Review; Published: July Apomixis and its role in evolution and breeding. Petrov (ed.). Balkema, PostbusNL BR Rotterdam, The : J.

De Wet. If apomixis is engineered into sexual crops in a controlled manner, its impact on agriculture will be broad and profound.

In fact, apomixis will allow clonal seed production and thus enable efficient and consistent yields of high-quality seeds, fruits, and vegetables at lower by: Apomixis is a type of reproduction in which sexual organs of related structures take part but seeds are formed without union of gametes.

Seeds formed in this way are vegetative in origin. Apomixis is widely distributed among higher plants. More than species belonging to 35 families are apomictic. Here, a brief account of apomixis, is furnished only from the point of view of breeding. apomixis in plant breeding.

Our main attention is on its benefits in crop improvement rather than its physiological nature or molecular mechanisms. Methods to achieve apomixis in crop species and its economic advantages are also discussed.

Mechanisms of apomixis There are various mechanisms of apomixis, some of which. Apomixis may have played a role in building and maintaining new genome combinations in Pennisetum. Hanna and Dujardin () summarized some of their research, which showed how apomixis was used in crosses among two sexual and three apomictic species in the x = 7 and x = 9 chromosome groups from the primary, secondary, and tertiary gene pools.

Comparison between conventional and apomixis-mediated methods for breeding F 1 hybrid varieties. In traditional breeding, within a segregating population (e.g., F 2 population) some genotypes are selected and after some generation of selfing followed by phenotypic selection, tested for their specific combining ability in order to be used as parental lines for the constitution of heterotic F 1 Cited by:   Apomixis is the mechanism of seed production without involving the process of meiosis and syngamy.

It plays an important role in hybrid seed production. The method of producing hybrid seeds by cultivation is very expensive for farmers.

Also, by sowing hybrid seeds, it is difficult to maintain hybrid characters as characters segregate during. This two-volume work surveys the entire range of general aspects of chromosome research on plants. This first volume is divided into two sections. Section A consists of 11 chapters covering the entire range of general aspects of chromosome research in plants (including a chapter on genetic engineering in crop improvement).

Section B is devoted to cytogenetics of cereals and millets (wheat, rye. elements of apomixis from Tripsacum to maize, in Apomixis and its role in evolution and breeding (ed. D.F. Petrov). Oxonian Press Ltd., New Delhi, India, pp. 9–Author: Bryan Kindiger. Since apomixis can incorporate different developmental events to achieve the end result of clonal progeny through seeds, multiple steps in a pathway may have undergone mutation and selection during evolution.

Apomixis includes both sporophytic and gametophytic types (Nogler, ). Somatic cells of the ovule directly form embryos during. ADVERTISEMENTS: Everything you need to know about apomixis in plant breeding.

Q What is apomixis. Give its main features. Ans. The term apomixis was first used by Winkler in Apomixis refers to the development of seed without fertilization.

In other words it does not involve sexual fusion for development of seed. It differs from [ ]. It has been 10 years since the last review on apomixis, or asexual seed formation, in this journal ([Koltunow, ][1]).

In that article, emphasis was given to the commonalties known among apomictic processes relative to the events of sexual reproduction.

The inheritance of apomixis had beenCited by: Find many great new & used options and get the best deals for Developments in Plant Genetics and Breeding: Chromosome Engineering in Plants: Genetics, Breeding, Evolution Pt. A (, Hardcover) at the best online prices at eBay. Free shipping for many products.

Apomixis: Genetics and Breeding. June ; /ch2. In book: Plant Breeding Reviews, Volume 18 (pp - 86) it is important to understand the role of apomixis in plant Author: Yves Savidan. Apomixis produces new hydrid breeds in lesser time.

Hybrid varieties of seeds having better yield and quality can be produced. Disease-free plants can be obtained; It transfers all the characters to the progeny.

Manifold yield of crops. Apomixis is an intriguing trait in plants that results in maternal clones through seed reproduction. Apomixis is an elusive, but potentially revolutionary, trait for plant breeding and hybrid seed production. Recent studies arguing that apomicts are not evolutionary dead ends have generated further interest in the evolution of asexual flowering by:   The major advantage of apomixis over sexual reproduction is the possibility to select individuals with desirable gene combinations and to propagate them as clones.

Also, it plays an important role in hybrid seed production. Apomixis prevents the loss of specific characters in the hybrid. It is also a cost-effective method for producing seeds. Apomixis in plants 1. Apomixis, derived from two Greek word "APO" (away from) and "mixis" (act of mixing or mingling).

APOMIXS is a type of reproduction in which sexual organs of related structures take part but seeds are formed without union of gametes. The first discovery of this phenomenon is credited to Leuwen hock as early as in Citrus seeds.

The genotype of the .Apomixis is found in over species of at least 35 different plant families (Bashaw & Hanna, ).

Scientists and geneticists have studied the two broad categories of apomixis—gametophytic and sporophytic—because of their widespread occurrence and potential usefulness in plant breeding. The genetic analysis of apomixisFile Size: KB.Download Cytology-and-evolution-in-parthenogenesis ebook PDF or Read Online This book brings out the central role of evolutionary genetics in all aspects of its connection to evolutionary biology.

and a review of future possibilities for using apomixis in plant breeding. Apomixis in Plants is an important reference volume for.