Self incompatibility in plants
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Mode of pollination is very important in plant breeding because it determines the genetic constitution, nature of gene action, ease in pollination control and stability of varieties after release. There are several mechanisms that promote cross pollination, among these self-incompatibility. Self incompatibility is defined as the prevention of fusion of fertile (functional) male and female gametes of the same plant (Gowers, 1989). Self incompatibility is a system where self-recognition and rejection is the rule that prevents inbreeding depression.Apomixis
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MASS SELECTION
Mass selection is a method of breeding in which individual plants are selected on the basis of phenotype from a mixed population , their seeds are bulked and used to grow the next generation.
Selection cycle may be repeated one or more times to increase the frequency of favorable alleles - phenotypic recurrent selection.
PURELINE SELECTION
A pureline is the progeny of a single homozygous plant of a self-pollinated species. All the plants in a pureline have the same genotype and the phenotypic variation within a pureline is due to the environment alone and has no genetic basis. However, variation within a pureline is not heritable. Hence selection in a pureline is not effective. Johannsen (1903,1926), a Danish biologist, developed the concept of pureline theory working with Princess variety of French bean (Phaseolus vulgaris), which showed variation for seed size. From a commercial seed lot he selected seeds of different sizes and grew them separately. The progenies differed in seed size. Progenies from larger seeds produced larger seeds than those obtained from smaller seeds. This clearly showed that the variation in seed size in the commercial seed lot of princess variety had a genetic base. As a result selection for seed size was effective.
Introduction
PEDIGREE SELECTION
Pedigree selection is a widely used method of breeding self-pollinated species.
A key difference between pedigree selection and mass selection or pure-line selection is that hybridization is used to generate variability (for the base population), unlike the other methods in which production of genetic variation is not a feature.
The method was first described by H. H. Lowe in 1927.
Pedigree selection is a breeding method in which the breeder keeps records of the ancestry of the cultivar.
The base population is established by crossing selected parents, followed by handling an actively segregating population.
Documentation of the pedigree enables breeders to trace parent–progeny back to an individual F2 plant from any subsequent generation.
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1) A synthetic variety is developed by inter-crossing multiple good inbred lines and mixing their F1 seeds. It partially exploits heterosis through open pollination over generations.
2) Synthetic varieties are developed to exploit heterosis and additive gene effects. They have wider adaptability than hybrids due to genetic diversity.
3) A synthetic variety initially consists of many heterozygotes, but some homozygosity is fixed over generations through self-pollination. Later generations consist of both heterozygotes and homozygotes.Heterosis
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Mode of pollination is very important in plant breeding because it determines the genetic constitution, nature of gene action, ease in pollination control and stability of varieties after release. There are several mechanisms that promote cross pollination, among these self-incompatibility. Self incompatibility is defined as the prevention of fusion of fertile (functional) male and female gametes of the same plant (Gowers, 1989). Self incompatibility is a system where self-recognition and rejection is the rule that prevents inbreeding depression.Apomixis
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This document discusses the diallel selective mating approach (DSM) for genetic improvement of autogamous crops. DSM involves three steps: 1) a parental diallel series of crosses between multiple parents, 2) F1 diallel series of crosses between F1 plants, and 3) selective mating series where selected F2 plants are intercrossed and selfed in successive generations. The goal is to accumulate desirable genes and increase recombination through restoring heterozygosity via intermating selected plants over multiple cycles. While it broadens the genetic base, DSM is more complex than pedigree methods and success depends on identifying desirable plants in segregating generations.$Male sterility
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SELECTION METHODS IN SELF-POLLINATED CROPS viz., mass selection, pureline sel...AMIT RANA Ph. D Scholar
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MASS SELECTION
Mass selection is a method of breeding in which individual plants are selected on the basis of phenotype from a mixed population , their seeds are bulked and used to grow the next generation.
Selection cycle may be repeated one or more times to increase the frequency of favorable alleles - phenotypic recurrent selection.
PURELINE SELECTION
A pureline is the progeny of a single homozygous plant of a self-pollinated species. All the plants in a pureline have the same genotype and the phenotypic variation within a pureline is due to the environment alone and has no genetic basis. However, variation within a pureline is not heritable. Hence selection in a pureline is not effective. Johannsen (1903,1926), a Danish biologist, developed the concept of pureline theory working with Princess variety of French bean (Phaseolus vulgaris), which showed variation for seed size. From a commercial seed lot he selected seeds of different sizes and grew them separately. The progenies differed in seed size. Progenies from larger seeds produced larger seeds than those obtained from smaller seeds. This clearly showed that the variation in seed size in the commercial seed lot of princess variety had a genetic base. As a result selection for seed size was effective.
Introduction
PEDIGREE SELECTION
Pedigree selection is a widely used method of breeding self-pollinated species.
A key difference between pedigree selection and mass selection or pure-line selection is that hybridization is used to generate variability (for the base population), unlike the other methods in which production of genetic variation is not a feature.
The method was first described by H. H. Lowe in 1927.
Pedigree selection is a breeding method in which the breeder keeps records of the ancestry of the cultivar.
The base population is established by crossing selected parents, followed by handling an actively segregating population.
Documentation of the pedigree enables breeders to trace parent–progeny back to an individual F2 plant from any subsequent generation.
The breeder should develop an effective, easy to maintain system of record keeping.
Pedigree selection is applicable to breeding species that allow individual plants to be observed, described, and harvested separately.
Self incompatibility
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This document discusses self-incompatibility in plants. It begins by defining self-incompatibility as the prevention of fertilization after self-pollination. There are two main types of self-incompatibility systems - homomorphic and heteromorphic. Heteromorphic systems involve morphological differences between flowers like distyly seen in Primula, while homomorphic systems do not. Homomorphic systems include gametophytic and sporophytic self-incompatibility, which differ in how the incompatibility reaction is controlled. Self-incompatibility promotes outbreeding and maintains genetic diversity in plant species. It has applications for plant breeding through hybrid seed production.Asexuapropagation and clonal propagation
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Some agricultural and horticultural crops such as sugarcane, potato, banana, and citrus propagate asexually through vegetative means rather than sexually from seeds. There are several reasons for this type of asexual reproduction: many of the crops are perennial plants that show reduced flowering and seed set or do not flower at all; propagating asexually avoids inbreeding depression in crops that are cross-pollinated and highly heterozygous; and some species are interspecific hybrids.SELECTION METHODS IN SELF-POLLINATED CROPS viz., mass selection, pureline sel...
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interspecific incompability
General features of Self-incompatibility
Classification of Self-incompatibility
Types of self - incompatibility
Mechanism of self - incompatibilitypresentation on self incompatibility.pptx
presentation on self incompatibility.pptxamitadhruva2018
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This presentation is about self incompatibility, a mechanism that promotes cross pollination and inhibits self pollination. This presentation just tells you all about self incompatibility in a precise manner and very easy for students to understand as important points have been highlighted. Pollination Control Method : Self in compatibility and Male sterility
Pollination Control Method : Self in compatibility and Male sterilitySubhashchandra Shabannavar
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pollination control methodsSelf incompatibility in hybrid seed production
Self incompatibility in hybrid seed productionParanjayRohiwala
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This presentation covers the role of Self incompatibility in hybrid seed production and development, maintenace and use for the same.Self incompatability in plants,pseudoalleles and isoalleles
Self incompatability in plants,pseudoalleles and isoallelesKanimoli Mathivathana
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Inability of a plant with functional pollen to set seed when self-pollinated.
Hindrance to self-fertilization.
Prevents inbreeding and promotes outcrossing.
Reported in about 70 families of angiosperms including crop species.
Self incompatibility in Plants
Self incompatibility in PlantsDhanya AJ
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Self-incompatibility refers to the inability of a plant with functional pollen to set seeds when self pollinated. It is the failure of pollen from a flower to fertilize the same flower or other flowers of the same plant.
This presentation includes, Single-locus self-incompatibility- {Gametophytic self-incompatibility (GSI) and Sporophytic self-incompatibility (SSI)},2-locus gametophytic self-incompatibility, Heteromorphic self-incompatibility,Cryptic self-incompatibility (CSI) and Late-acting self-incompatibility (LSI).
Self incompatibility
Self incompatibilityHammad Uddin
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Self-incompatibility refers to a plant's inability to set seeds when self-pollinated. There are several types of self-incompatibility mechanisms in plants including homomorphic and heteromorphic self-incompatibility. Homomorphic self-incompatibility includes gametophytic and sporophytic types, while heteromorphic involves distyly and tristyly where the stamens and pistils exist in two or three distinct forms. Self-incompatibility promotes outbreeding and genetic variation in plant populations. It is important for plant breeding as it requires planting two cross-compatible varieties to ensure fruitfulness and can be used for hybrid seed production. However, self-incompatibility also has limitations like difficulty producing inbred lines andself incompatibility and male sterility
self incompatibility and male sterilityIshita Dey
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This document discusses self-incompatibility and male sterility in plants, including their classification and uses in crop improvement. It is classified based on flower morphology, genes involved, site of expression, and pollen cytology. Male sterility is classified as genetic male sterility, cytoplasmic male sterility, or cytoplasmic genetic male sterility depending on whether nuclear genes, cytoplasmic genes, or both control sterility. Self-incompatibility and male sterility help promote cross-pollination and are useful for hybrid seed production without emasculation in crops like cabbage and cauliflower.FLOWERING PROCESS- A TRANSITION FROM VEGETATIVE TO REPRODUCTIVE ORGAN.pptx
FLOWERING PROCESS- A TRANSITION FROM VEGETATIVE TO REPRODUCTIVE ORGAN.pptx406SAKSHIPRIYA
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Flowering involves the sequential action of two groups of genes: those that switch the fate of the meristem from vegetative to floral (floral meristem identity genes) and those that direct the formation of the various flower parts (organ identity genes.)
self incompatability.ppt
self incompatability.pptPudhuvai Baveesh
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Self-incompatibility is a plant's inability to set seed when self-pollinated due to morphological, genetic, physiological or biochemical causes controlled by the multi-allelic S locus. It is classified based on flower morphology, genes involved, site of expression, and pollen cytology. Two main types are distyly found in primula, controlled by two S alleles, and tristyly found in lythrum, controlled by S and M genes determining three style positions. Self-incompatibility prevents self-fertilization by arresting pollen tube growth when the pollen and pistil share the same S allele.Pollen pistil interaction
Pollen pistil interactionGovt. Degree College for Women (A), Begumpet, Hyderabad, Telangana
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Pollen pistil interaction
Types of Incompatibility in plants
Methods to overcome Incompatibility
Prepared by
Dr. T. Annie Sheron
Assistant Professor of Botany
DEPARTMENT OF BOTANY
KAKATIYA GOVERNMENT COLLEGE, HANAMKONDARecently uploaded (20)
Research & Research Methods: Basic Concepts and Types.pptx
Research & Research Methods: Basic Concepts and Types.pptxDr. Sarita Anand
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This ppt has been made for the students pursuing PG in social science and humanities like M.Ed., M.A. (Education), Ph.D. Scholars. It will be also beneficial for the teachers and other faculty members interested in research and teaching research concepts.
How to use Init Hooks in Odoo 18 - Odoo ºÝºÝߣs
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In this slide, we’ll discuss on how to use Init Hooks in Odoo 18. In Odoo, Init Hooks are essential functions specified as strings in the __init__ file of a module.How to Modify Existing Web Pages in Odoo 18
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In this slide, we’ll discuss on how to modify existing web pages in Odoo 18. Web pages in Odoo 18 can also gather user data through user-friendly forms, encourage interaction through engaging features. Year 10 The Senior Phase Session 3 Term 1.pptx
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Year 10 The Senior Phase Session 3 Term 1.pptxMate, a short story by Kate Grenvile.pptx
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A powerpoint presentation on the short story Mate by Kate Greenville. This presentation provides information on Kate Greenville, a character list, plot summary and critical analysis of the short story.Blind Spots in AI and Formulation Science Knowledge Pyramid (Updated Perspect...
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This presentation delves into the systemic blind spots within pharmaceutical science and regulatory systems, emphasizing the significance of "inactive ingredients" and their influence on therapeutic equivalence. These blind spots, indicative of normalized systemic failures, go beyond mere chance occurrences and are ingrained deeply enough to compromise decision-making processes and erode trust.
Historical instances like the 1938 FD&C Act and the Generic Drug Scandals underscore how crisis-triggered reforms often fail to address the fundamental issues, perpetuating inefficiencies and hazards.
The narrative advocates a shift from reactive crisis management to proactive, adaptable systems prioritizing continuous enhancement. Key hurdles involve challenging outdated assumptions regarding bioavailability, inadequately funded research ventures, and the impact of vague language in regulatory frameworks.
The rise of large language models (LLMs) presents promising solutions, albeit with accompanying risks necessitating thorough validation and seamless integration.
Tackling these blind spots demands a holistic approach, embracing adaptive learning and a steadfast commitment to self-improvement. By nurturing curiosity, refining regulatory terminology, and judiciously harnessing new technologies, the pharmaceutical sector can progress towards better public health service delivery and ensure the safety, efficacy, and real-world impact of drug products.FESTIVAL: SINULOG & THINGYAN-LESSON 4.pptx
FESTIVAL: SINULOG & THINGYAN-LESSON 4.pptxDanmarieMuli1
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Sinulog Festival of Cebu City, and Thingyan Festival of Myanmar.Kaun TALHA quiz Finals -- El Dorado 2025
Kaun TALHA quiz Finals -- El Dorado 2025Conquiztadors- the Quiz Society of Sri Venkateswara College
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Finals of Kaun TALHA : a Travel, Architecture, Lifestyle, Heritage and Activism quiz, organized by Conquiztadors, the Quiz society of Sri Venkateswara College under their annual quizzing fest El Dorado 2025. Principle and Practices of Animal Breeding || Boby Basnet
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Principle and Practices of Animal Breeding Full Note
|| Assistant Professor Boby Basnet ||IAAS || AFU || PU || FUKaun TALHA quiz Prelims - El Dorado 2025
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Prelims of Kaun TALHA : a Travel, Architecture, Lifestyle, Heritage and Activism quiz, organized by Conquiztadors, the Quiz society of Sri Venkateswara College under their annual quizzing fest El Dorado 2025. Eng7-Q4-Lesson 1 Part 1 Understanding Discipline-Specific Words, Voice, and T...
Eng7-Q4-Lesson 1 Part 1 Understanding Discipline-Specific Words, Voice, and T...sandynavergas1
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Understanding Discipline-Specific Words, Voice, and Technical Terms
Useful environment methods in Odoo 18 - Odoo ºÝºÝߣs
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In this slide we’ll discuss on the useful environment methods in Odoo 18. In Odoo 18, environment methods play a crucial role in simplifying model interactions and enhancing data processing within the ORM framework.
APM People Interest Network Conference - Tim Lyons - The neurological levels ...
APM People Interest Network Conference - Tim Lyons - The neurological levels ...Association for Project Management
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APM People Interest Network Conference 2025
-Autonomy, Teams and Tension: Projects under stress
-Tim Lyons
-The neurological levels of
team-working: Harmony and tensions
With a background in projects spanning more than 40 years, Tim Lyons specialised in the delivery of large, complex, multi-disciplinary programmes for clients including Crossrail, Network Rail, ExxonMobil, Siemens and in patent development. His first career was in broadcasting, where he designed and built commercial radio station studios in Manchester, Cardiff and Bristol, also working as a presenter and programme producer. Tim now writes and presents extensively on matters relating to the human and neurological aspects of projects, including communication, ethics and coaching. He holds a Master’s degree in NLP, is an NLP Master Practitioner and International Coach. He is the Deputy Lead for APM’s People Interest Network.
Session | The Neurological Levels of Team-working: Harmony and Tensions
Understanding how teams really work at conscious and unconscious levels is critical to a harmonious workplace. This session uncovers what those levels are, how to use them to detect and avoid tensions and how to smooth the management of change by checking you have considered all of them.Kaun TALHA quiz Finals -- El Dorado 2025
Kaun TALHA quiz Finals -- El Dorado 2025Conquiztadors- the Quiz Society of Sri Venkateswara College
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Kaun TALHA quiz Prelims - El Dorado 2025
Kaun TALHA quiz Prelims - El Dorado 2025Conquiztadors- the Quiz Society of Sri Venkateswara College
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APM People Interest Network Conference - Tim Lyons - The neurological levels ...
APM People Interest Network Conference - Tim Lyons - The neurological levels ...Association for Project Management
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