Apomixis

Author : Lenn Jerling
Publisher : Routledge
Page : 324 pages
File Size : 40,9 Mb
Release : 2017-11-22
Category : Science
ISBN : 9781351466301

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Apomixis in Plants by Lenn Jerling Pdf

Apomixis in Plants presents a comprehensive review of different aspects of asexual seed formation in plants. This is important in plant research since apomixis could greatly facilitate breeding in important crops. It is also interesting theoretically because it carries problems related to genetic variation and evolution to its extreme. The book features a broad selection of topics, including a historical review of ideas and landmarks in the field; comparisons with other types of asexual reproduction in higher plants and with related phenomena in animals and related plants; a presentation of cytology and embryology of apomicts and the diversified terminology in the field; views on the genetic background of apomixis and environmental effects on its expression; and the interrelation between apomixis and other traits. Additional topics covered include classical and modern theories of sexual versus asexual reproduction; geographical and taxonomical trends in apomicts; ecological implications of apomixis, and a review of future possibilities for using apomixis in plant breeding. Apomixis in Plants is an important reference volume for researchers and students in all areas of botany, ecology, and plant breeding.

Author : Tamara N. Naumova
Publisher : CRC Press
Page : 160 pages
File Size : 51,7 Mb
Release : 1992-11-18
Category : Science
ISBN : 0849345707

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Apomixis in Angiosperms by Tamara N. Naumova Pdf

Apomixis in Angiosperms: Nucellar and Integumentary Embryony is based on original cytoembryological data and critically reviewed literature on more than 250 species from 57 families of angiosperms. The book covers the complete process of nucellar and integumentary embryo formation and viable seed development within species, families, and among angiosperms in general. Many species (some of which are economically important) characterized by adventive embryony are listed. The book also provides an original simple classification of apomixis and offers a new approach to differentiating embryological structures in cases of apomixis and amphimixis. Apomixis in Angiosperms: Nucellar and Integumentary Embryony will be a useful reference for embryologists, botanists, cytologists, geneticists, and plant breeders. It will also benefit any researcher interested in studying somatic embryo formation in tissue culture.

Author : Yves Savidan,John G. Carman,Thomas Dresselhaus
Publisher : CIMMYT
Page : 260 pages
File Size : 46,7 Mb
Release : 2001
Category : Science
ISBN : 9706480749

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The Flowering of Apomixis by Yves Savidan,John G. Carman,Thomas Dresselhaus Pdf

Author : Sven Asker,Lenn Jerling
Publisher : CRC Press
Page : 324 pages
File Size : 42,9 Mb
Release : 1992-03-10
Category : Science
ISBN : 0849345456

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Apomixis in Plants by Sven Asker,Lenn Jerling Pdf

Apomixis in Plants presents a comprehensive review of different aspects of asexual seed formation in plants. This is important in plant research since apomixis could greatly facilitate breeding in important crops. It is also interesting theoretically because it carries problems related to genetic variation and evolution to its extreme. The book features a broad selection of topics, including a historical review of ideas and landmarks in the field; comparisons with other types of asexual reproduction in higher plants and with related phenomena in animals and related plants; a presentation of cytology and embryology of apomicts and the diversified terminology in the field; views on the genetic background of apomixis and environmental effects on its expression; and the interrelation between apomixis and other traits. Additional topics covered include classical and modern theories of sexual versus asexual reproduction; geographical and taxonomical trends in apomicts; ecological implications of apomixis, and a review of future possibilities for using apomixis in plant breeding. Apomixis in Plants is an important reference volume for researchers and students in all areas of botany, ecology, and plant breeding.

Author : Gurdev S. Khush
Publisher : Int. Rice Res. Inst.
Page : 86 pages
File Size : 42,6 Mb
Release : 1994
Category : Apomixis
ISBN : 9789712200649

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Apomixis by Gurdev S. Khush Pdf

Apomixis for rice improvement; Transferring apomixis to maize; Transfer of alien chromosome-carrying gene for apomixis to cultived pennisetum; Cytological mechanisms of apospory and diplospory; Genetics of apomixis mechanisms; Embryo and flower development in rice and apomixis in Chinese chive (Allium tuberosum); Modifying embryo sac development and strategies for cloning the apomixis gene from buffelgrass; Molecular markers for apomixis in Pennisetum; Using Arabidopsis in the analysis of megaspore development; Developmental genetics of floral patterning in Arabidopsis thaliana; Isolating apomictic mutnats in Arabidopsis thaliana - prospects adn progess.

Author : Diego Hojsgaard,Thammineni Pullaiah
Publisher : CRC Press
Page : 498 pages
File Size : 53,7 Mb
Release : 2022-08-19
Category : Science
ISBN : 9781000624014

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Apomixis in Angiosperms by Diego Hojsgaard,Thammineni Pullaiah Pdf

Apomixis is a difficult-to-analyse trait with a complex molecular basis and a substantive effect on the biology of a species. Thus, apomixis is an interesting characteristic for researchers and students working in different fields of plant science and agriculture, and technological advances are enabling and making apomixis studies more common. Apomixis in Angiosperms: Mechanisms, Occurrences, and Biotechnology provides a systematic introduction to the mechanisms and developmental types of apomixis along with an overview of alternative methodologies for identifying apomixis and a detailed reassessment of the occurrences of apomictic species among angiosperm families. Optional methods are illustrated with examples of all types of apomixis and biological levels of analysis, i.e. cells, ovules, seeds and offspring. Data on apomictic species are collected in tables along with information on ploidy, type of apomixis and references. Occurrences of apomixis are briefly discussed in phylogenetic and evolutionary contexts. An outline of the molecular basis of apomixis in plants is presented, together with prospects and challenges that remain for its biotechnological exploitation. This book: Provides a systematic overview of the mechanisms of apomixis, developmental types and methodology for apomixis research. Reassesses apomixis at the species level in angiosperm families. Contains tables summarizing relevant information on apomixis. Analyses occurrences of apomixis in phylogenetic and evolutionary contexts. Outlines the molecular basis and biotechnological perspective of apomixis breeding. This book presents an accessible overview of apomixis research and a curated dataset of apomictic species. It serves as a reference book for students, researchers and citizen scientists interested in apomixis, as well as researchers, business innovators and entrepreneurs pursuing apomixis breeding. It can also be used as a textbook in graduate courses on plant reproduction.

Author : Diego Hojsgaard
Publisher : MDPI
Page : 300 pages
File Size : 50,8 Mb
Release : 2021-09-08
Category : Science
ISBN : 9783036515083

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Molecular Basis of Apomixis in Plants by Diego Hojsgaard Pdf

Apomixis is the consequence of a concerted mechanism that harnesses the sexual machinery and coordinates developmental steps in the ovule to produce an asexual (clonal) seed. Altered sexual developments involve widely characterized functional and anatomical changes in meiosis, gametogenesis, and embryo and endosperm formation. The ovules of apomictic plants skip meiosis and form unreduced female gametophytes whose egg cells develop into a parthenogenetic embryo, and the central cells may or may not fuse to a sperm to develop the seed endosperm. Thus, functional apomixis involves at least three components, apomeiosis, parthenogenesis, and endosperm development, modified from sexual reproduction that must be coordinated at the molecular level to progress through the developmental steps and form a clonal seed. Despite recent progress uncovering specific genes related to apomixis-like phenotypes and the formation of clonal seeds, the molecular basis and regulatory network of apomixis is still unknown. This is a central problem underlying the current limitations of apomixis breeding. This book collates twelve publications addressing different topics around the molecular basis of apomixis, illustrating recent discoveries and advances toward understanding the genetic regulation of the trait, discussing the possible origins of apomixis and the remaining challenges for its commercial deployment in plants.

Author : P. K. Gupta
Publisher : Rastogi Publications
Page : 436 pages
File Size : 40,6 Mb
Release : 2007
Category : Cytogenetics
ISBN : 8171337376

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Cytogenetics by P. K. Gupta Pdf

Author : Tamara N. Naumova
Publisher : CRC Press
Page : 152 pages
File Size : 51,8 Mb
Release : 2018-01-10
Category : Science
ISBN : 9781351086653

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Apomixis in Angiosperms by Tamara N. Naumova Pdf

Apomixis in Angiosperms: Nucellar and Integumentary Embryony is based on original cytoembryological data and critically reviewed literature on more than 250 species from 57 families of angiosperms. The book covers the complete process of nucellar and integumentary embryo formation and viable seed development within species, families, and among angiosperms in general. Many species (some of which are economically important) characterized by adventive embryony are listed. The book also provides an original simple classification of apomixis and offers a new approach to differentiating embryological structures in cases of apomixis and amphimixis. Apomixis in Angiosperms: Nucellar and Integumentary Embryony will be a useful reference for embryologists, botanists, cytologists, geneticists, and plant breeders. It will also benefit any researcher interested in studying somatic embryo formation in tissue culture.

Author : S.M. Jain,D.S. Brar,B.S. Ahloowalia
Publisher : Springer Science & Business Media
Page : 644 pages
File Size : 43,9 Mb
Release : 1998-05-31
Category : Science
ISBN : 0792348621

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Somaclonal Variation and Induced Mutations in Crop Improvement by S.M. Jain,D.S. Brar,B.S. Ahloowalia Pdf

Genetic variability is an important parameter for plant breeders in any con ventional crop improvement programme. Very often the desired variation is un available in the right combination, or simply does not exist at all. However, plant breeders have successfully recombined the desired genes from cultivated crop gerrnplasm and related wild species by sexual hybridization, and have been able to develop new cultivars with desirable agronomie traits, such as high yield, disease, pest, and drought resistance. So far, conventional breeding methods have managed to feed the world's ever-growing population. Continued population growth, no further scope of expanding arable land, soil degradation, environ mental pollution and global warrning are causes of concern to plant biologists and planners. Plant breeders are under continuous pressure to improve and develop new cultivars for sustainable food production. However, it takes several years to develop a new cultivar. Therefore, they have to look for new technologies, which could be combined with conventional methods to create more genetic variability, and reduce the time in developing new cultivars, with early-maturity, and improved yield. The first report on induced mutation of a gene by HJ. Muller in 1927 was a major mi1estone in enhancing variation, and also indicated the potential applica tions of mutagenesis in plant improvement. Radiation sources, such as X-rays, gamma rays and fast neutrons, and chemical mutagens (e. g. , ethyl methane sulphonate) have been widely used to induce mutations.

Author : Elvira Hörandl
Publisher : Gantner Publishing
Page : 432 pages
File Size : 53,6 Mb
Release : 2007
Category : Gardening
ISBN : UOM:39015068765331

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Apomixis by Elvira Hörandl Pdf

Apomixis (asexual reproduction without fertilisation) is no longer regarded as a 'blind alley' of evolution, but rather as an alternative mechanism to the predominant sexual pathway, and that needs to be explored in many details to fully understand its role in nature.

Author : Keith Roberts
Publisher : John Wiley & Sons
Page : 1697 pages
File Size : 40,5 Mb
Release : 2007-12-10
Category : Science
ISBN : 9780470057230

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Handbook of Plant Science, 2 Volume Set by Keith Roberts Pdf

Plant Science, like the biological sciences in general, has undergone seismic shifts in the last thirty or so years. Of course science is always changing and metamorphosing, but these shifts have meant that modern plant science has moved away from its previous more agricultural and botanical context, to become a core biological discipline in its own right. However the sheer amount of information that is accumulating about plant science, and the difficulty of grasping it all, understanding it and evaluating it intelligently, has never been harder for the new generation of plant scientists or, for that matter, established scientists. And that is precisely why this Handbook of Plant Science has been put together. Discover modern, molecular plant sciences as they link traditional disciplines! Derived from the acclaimed Encyclopedia of Life Sciences! Thorough reference of up-to-the minute, reliable, self-contained, peer-reviewed articles – cross-referenced throughout! Contains 255 articles and 48 full-colour pages, written by top scientists in each field! The Handbook of Plant Science is an authoritative source of up-to-date, practical information for all teachers, students and researchers working in the field of plant science, botany, plant biotechnology, agriculture and horticulture.

Author : N. Kumar
Publisher : New India Publishing
Page : 230 pages
File Size : 52,8 Mb
Release : 2006
Category : Horticultural crops
ISBN : 8189422049

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Breeding of Horticultural Crops by N. Kumar Pdf

The book has been designed with the main consideration to serve a dual purpose of being a text and reference. Keeping this thing in mind the entire book has been divided into three major parts. The first part deals with the principles and methods of breeding adopted in horticultural crops propagated both sexually and asexually. The second part deals with the achievements in breeding of perennial horticultural crops. The third part covers achievements made in breeding of annual horticultural crops.

Author : Ram J. Singh
Publisher : CRC Press
Page : 549 pages
File Size : 49,8 Mb
Release : 2016-11-18
Category : Science
ISBN : 9781439884195

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Plant Cytogenetics by Ram J. Singh Pdf

Cytogenetics plays an important role in understanding the chromosomal and genetic architecture of plant species. Plant Cytogenetics, Third Edition follows the tradition of its predecessors presenting theoretical and practical aspects of plant cytogenetics. Chapters describe correct handling of plant chromosomes, methods in plant cytogenetics, cell division, reproduction methods, chromosome nomenclature, karyotype analysis, chromosomal aberrations, genome analysis, transgenic crops, and cytogenetics in plant breeding. This new edition begins with a brief introduction on the historical aspect of cytogenetics and flows directly into handling of plant chromosomes by classical and modern cytological techniques, classical Mendelian Genetics, brief description of cell division, and chromosome identification by karyotype analysis. The comprehension of cytogenetics is incomplete without information on the role of aneuploidy in associating a gene on a particular chromosome, and the book covers these methodologies as a primary topic. Covering classical to modern cytogenetics, the book presents to the reader the crucial role of cytogenetics in improving crops.

Author : G. S. Chahal,S. S. Gosal
Publisher : Alpha Science Int'l Ltd.
Page : 628 pages
File Size : 47,6 Mb
Release : 2002
Category : Nature
ISBN : 184265036X

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Principles and Procedures of Plant Breeding by G. S. Chahal,S. S. Gosal Pdf

Alternate approaches for the exploitation of heterosis and population improvement have been elaborated with the help of schematic diagrams.