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selfing and crossing techniques ppt

Botany, floral biology, selfing and crossing techniques for plantation crops Study of pollen viability, emasculation and pollination procedures in plantation crops Production of hybrids in plantation crops Types of Hybridization 3. The goals of plant breeding are to produce crop varieties that boast unique and … This mechanism of SI is widely used in Brassica and Raphanus for production of single-cross hybrid seeds (Chahal and Gosal, 2002). 9. Ø The details of the monohybrid cross are summarized in … For Hybrid Seed Production of Okra, the most productive and desirable hybrid seed is obtained from the female parent when there is a perfect coincidence of stigma receptiveness and pollen viability. Principles of Plant Breeding (Paper Code: 17010304) Theory Aims and objectives of plant breeding Floral biology, pollination and emasculation techniques in cereals, millets, pulses, oil seeds, fibers, plantation crops etc; modes of reproduction, sexual, asexual, apomixis and their classification; significance … The following factors were found to have pronounced effects: 1. crop variety or strain, 2. seasonal conditions, 3. wind speed and direction, and. Crossing techniques: Emasculation: Hand emasculation: Many generations of selfing lead to inbreeding depression; 15 Crossing and Test Crossing. Cleistogamous flowers cost less Crossing these lines yields fertile progeny because the male maintainer lines contribute nuclear restoring genes (Schnable and Wise, 1998). They also use certain methods and techniques, dictated by factors including plant mating system, source of genetic variability, and the number of genes that condition the target trait. Tomato is considered as a member of the family Solanaceae. NEXT . Plant breeding - Plant breeding - Evaluation of plants: The appraisal of the value of plants so that the breeder can decide which individuals should be discarded and which allowed to produce the next generation is a much more difficult task with some traits than with others. Preface This book is specifically written for the undergraduate and Post Graduate Students following the same syllabus of State Agricultural Universities and ICAR Institutes . History of Plant Breeding The most rudimentary forms of plant breeding likely originated during the transition of This book will be an indispensible guide and immensely helpful for JRF, Suitable hermaphrodite plants, which do not vary with climatic changes, are selected. TNAU Notes pdf can be easily downloaded by clicking on the below provided links. PGS-505 Agricultural research, research ethics and rural development programme (e-course) 1+0=1 ... selfing and crossing techniques. In cotton, heterosis of 50% over the popular variety and 20% over the popular hybrid is considered significant for development of … completely inbreeding (selfing) Floral structure: Cultivated Tomato Wild Tomato Cultivated tomatoes are self-pollinating. Basics of Experimental Design, Layout And. Artificial Selfing and Crossing Techniques in. Usually, there are 900-3000 spikelets per panicle, averaging 1600 spikelets. 2015). Cornerstones 4. It has been used to improve the quality of nutrition in products for humans and animals. From 15-30 selected F 1 plants, the F 2 seeds are collected to get a reasonable size of F 2 population and variation.. Third Year: In F 2 generation, 2000-10000 plants are space planted, 100-500 plants are selected and their seeds are harvested separately. PGS-504 Basic concepts in laboratory techniques 0+1=2 . ... speed back-crossing (can achieve the equivalent of BC4 at BC2) Breeding and selection predominantly • Backcross (including inbred-backcross and advanced-backcross) Handling of Segregating Generations. In India, “Green Revolution” was responsible […] Many students always searches about TNAU study material and TNAU agriculture notes but they didn't get it because of some misleading sites. Generations: P1 x P2 F1 F2 S1 families if self pollinated F3 if intermated Year 1 Year 2 Year 3. The first crops that used the CMS fertility-restoring gene system as a method for commercially producing hybrid seed were sorghum and corn (Poehlman and Sleper, 1995). Selfing techniques: Since a little amount of out-crossing occurs in ragi to ensure self- fertilization, butter paper bags are used to cover the panicle (ear heads). The percentage occurences of natural crossing and natural selfing within any of the abovementioned natural methods of pollination are expected to vary. Magnitude of Heterosis: For development of hybrid cultivars, there should be enough magnitude of heterosis. 10 Visit to Biotechnology Lab & study of in– vitro breeding techniques 315-318 11 Exposure to resistance breeding & screening techniques 319-324 12 Practices in mutation breeding 325-329 13 Botany, floral biology, selfing and crossing techniques for plantation crops 330-336 However, the availability of alternative suitable methods to avoid selfing and optimize crossing will considerably reduce the cost of F 1 seed (Kumar and Singh 2005, Sharma et al. I - Plant Breeding and Genetics - M. A. Arterburn, S. S. Jones and K. K. Kidwell ©Encyclopedia of Life Support Systems (EOLSS) 2. Pollen shedding often occurs before flowers open. Course Material. A very large, searchable collection of highquality SELFING AND EMASCULATION IN PLANTS PPT presentations preconverted to enable easy online viewing with full. SELFING AND CROSSING TECHNIQUES - authorSTREAM Presentation. Better management can increase yield but only to a limited extent. The bisexual or hermaphrodite floret consists of a pistil and three anthers. Each spikelets has two florets, one bisexual and other staminate. How Pollination without emasculation: an efficient method of Result of crossing … Sekaki packed for the local market Eksotika packed for export market But plant breeding as a technology increased yield to a very large extent. Different Crop Plants. It involves selfing regular and prolific bearing hermaphrodite and or crossing (sibmating) the female with hermaphrodite. Selfing and Crossing Techniques Controlled pollination without resort to emasculation is a common phenomena in peal millet. Emasculation is a method of “Artificial Hybridization” generally used to promote cross pollination in plants and avoid self pollination. By performing a test cross, one can determine whether the individual is homozygous or heterozygous dominant. F 1 generation seeds are space planted and selfing is allowed, each F 1 will produce more F 2 seeds. SI promotes heterozygosity and therefore is desirable. Plant breeding is the science of changing the traits of plants in order to produce desired characteristics. Demonstration of Selfing and Crossing Techniques in Cotton (Gossypium hirsutum L.) Download Files l-1.ppt (6.07 MB ) Introduction to Hybridization: The mating or crossing of two plants or lines of dissimilar genotype is known as hybridization. After blooming completes in all the spikes, these bags are removed. unique among modes of selfing (Schoen and Lloyd 1984; Lively and Lloyd 1990) in possessing an advantage over outcrossing (the "cost of out- crossing") that is derived from a cost of producing males, as modeled by Maynard Smith (1971), rather than a cost of meiosis, as described by Williams (1971). Ex. The crossing phase may require specialized equipment and pollinators. Maintenance of Records. Introduction to Hybridization 2. ... crossing over-mechanisms and theories of crossing over- recombination models, Crossing is useful when trying to create hybrid seed. By crossing Inbred A x Inbred a you would obtain an F1 hybrid Aa ; Crossing is used to produce the hybrid seed farmers use to plant in the spring ; Test Crossing is useful to test general combining Methods. Slide 49: The method suitable for a particular species is determined by the following factors: a) The size of its flowers Cotton, gram, brassica etc. Ø The F2 dwarf plant on selfing produced all dwarf progenies (F3 generation). out crossing, (3) flower biology, and (4) availability of male sterility system. When it is desired to overcome SI to promote homozygosity, techniques like removal of stigma surface and bud pollination can be used (Chahal and Gosal, 2002). The transfer of pollen from male parent to female parent is called as pollination. 8. Ø The 2/3 of the tall F2 on selfing produce tall and dwarf plants in 3 : 1 ratio (F3 generation). UNESCO – EOLSS SAMPLE CHAPTERS SOILS, PLANT GROWTH AND CROP PRODUCTION - Vol. The natural crossing, however, can be major source of contamination due to natural crossing are the breeding system of the species, isolation distance, varietal mass and pollinating agent. Green Revolution: Traditional farming can only yield limited food for humans and animals. cotton-latest-winter-2015-16.ppt (6.90 MB ) PREV. Under the law of dominance in genetics, an individual expressing a dominant phenotype could contain either two copies of the dominant allele (homozygous dominant) or one copy of each dominant and recessive allele (heterozygousdominant). Synthetic/Composite Varieties. Plant breeding - Plant breeding - Breeding self-pollinated species: The breeding methods that have proved successful with self-pollinated species are: (1) mass selection; (2) pure-line selection; (3) hybridization, with the segregating generations handled by the pedigree method, the bulk method, or by the backcross method; and (4) development of hybrid varieties. In plants, crossing is done by placing pollen grains from one genotype i.e., male parent, on […] ADVERTISEMENTS: Plant Breeding: Steps and Methods of Plant Breeding for Disease Resistance! crossing between the three different sex forms and the resulting sex of the progenies: l hermaphrodite x hermaphrodite (as in selfing of hermaphrodites) →1 female: 2 hermaphrodites; 3 MARDI: The Malaysian Agricultural Research and Development Institute, established in 1969. Abstract. In this article we will discuss about:- 1. Ø The F2 tall plant on selfing, only 1/3 breed true (produce only tall plants). The production of a hybrid corn variety involves three steps: (1) the selection of superior plants; (2) selfing for several generations to produce a series of inbred lines, which although different from each other are each pure-breeding and highly uniform; and (3) crossing selected inbred lines. 7. Of the various types of the flower produced by a hermaphrodite plants Study the ports of entry to plants9.

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