diallele selective mating

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Information about diallele selective mating
Science-Technology

Published on October 15, 2014

Author: pragadaveraja

Source: authorstream.com

WELCOME: WELCOME TOPIC: DIALLEL SELECTIVE MATING APPROACH PREPARED BY: PRAGADA VERAJA 13MSSDCI032 SAMHIGGINBOTTOM INSTITUTE OF AGRICULTURE, TECHNOLOGY AND SCIENCES, ALLAHABAD, UTTAR PRADESH, INDIA : TOPIC: DIALLEL SELECTIVE MATING APPROACH PREPARED BY: PRAGADA VERAJA 13MSSDCI032 SAMHIGGINBOTTOM INSTITUTE OF AGRICULTURE, TECHNOLOGY AND SCIENCES, ALLAHABAD, UTTAR PRADESH, INDIA POPULATION IMPROVEMENT APPROACHES: 1.Recurrent selection 2.Disruptive selection 3.Diallel selective mating 4.Biparental mating: POPULATION IMPROVEMENT APPROACHES: 1.Recurrent selection 2.Disruptive selection 3.Diallel selective mating 4.Biparental mating DIALLEL SELECTIVE MATING APPROACH: DIALLEL SELECTIVE MATING APPROACH CONTENT: 1.Introduction 2.Definition of DSM approach 3.Features of DMS approach 4.Breeding procedure 5.Merits 6.Demerits: CONTENT: 1.Introduction 2.Definition of DSM approach 3.Features of DMS approach 4.Breeding procedure 5.Merits 6.Demerits INTRODUCTION: The concept of diallel selective mating selective (DSM) was originally developed by Jensen in 1970. Jensen used this system for genetic improvement of wheat. Now this system is used for genetic improvement of various autogamous crops especially small grain crops such as wheat, barley, rice,etc.: INTRODUCTION: The concept of diallel selective mating selective (DSM) was originally developed by Jensen in 1970. Jensen used this system for genetic improvement of wheat. Now this system is used for genetic improvement of various autogamous crops especially small grain crops such as wheat, barley, rice,etc. DEFINITION OF DSM APPROACH: A method of population improvement of autogamous species that involves parental diallel series,F1 diallel series and selective mating series in the breeding procedure.: DEFINITION OF DSM APPROACH: A method of population improvement of autogamous species that involves parental diallel series,F 1 diallel series and selective mating series in the breeding procedure. FEATURES OF DSM APPROACH: 1. Effective method of improving those autogamous species which are difficult to cross and have few seeds per cross. It is useful in improving small grain crops. 2. This is the important method of population improvement in self pollinating species. 3.This is generally a form of recurrent , because it involves selection and intermating in segregating generations.: FEATURES OF DSM APPROACH: 1. Effective method of improving those autogamous species which are difficult to cross and have few seeds per cross. It is useful in improving small grain crops. 2. This is the important method of population improvement in self pollinating species. 3.This is generally a form of recurrent , because it involves selection and intermating in segregating generations. 4.It permits use of conventional breeding method (mass selection, recurrent selection) and improvement of population by intermating. 5.This system permits identification of superior genotypes and new cultivars at various stages. 6.This system permits incorporation of new germplasm at any stage in the breeding programme. : 4.It permits use of conventional breeding method (mass selection, recurrent selection) and improvement of population by intermating. 5.This system permits identification of superior genotypes and new cultivars at various stages. 6.This system permits incorporation of new germplasm at any stage in the breeding programme. 7.This system permits inclusion of multiple parents in the breeding programme. 8.This system fulfils both short term and long term breeding goals. 9.The end product of DSM can be used as a pureline variety, mass selected variety or as parental lines for further use in the breeding programme. : 7.This system permits inclusion of multiple parents in the breeding programme. 8.This system fulfils both short term and long term breeding goals. 9.The end product of DSM can be used as a pureline variety, mass selected variety or as parental lines for further use in the breeding programme. BREEDING PROCEDURE: The breeding procedure of DSM consists of three major steps: 1.Parental diallel series 2.F1 diallel series 3.Selective mating series: BREEDING PROCEDURE: The breeding procedure of DSM consists of three major steps: 1.Parental diallel series 2.F 1 diallel series 3.Selective mating series 1.PARENTAL DIALLEL SERIES: The parental lines are selected keeping in view the breeding objectives. The selected parents are crossed in a diallel fashion and F1 seeds are obtained. If the number of parents is 7 or less, complete diallel is used. When the number of parents is more than 7, partial diallel cross is made. The parental diallel series is designated as P1.: 1.PARENTAL DIALLEL SERIES: The parental lines are selected keeping in view the breeding objectives. The selected parents are crossed in a diallel fashion and F 1 seeds are obtained. If the number of parents is 7 or less, complete diallel is used. When the number of parents is more than 7, partial diallel cross is made. The parental diallel series is designated as P 1 . 2.F1 DIALLEL SERIES: The above F1 crosses are used in 2 ways: (1) to produce F2 population, and (2) to develop F1 diallel series. Mass selection is practiced to advance the F2 population. The F1 diallel series is also known as multiple parent crosses because each cross involves four parents. The F1 diallel series is designated as P2.: 2.F1 DIALLEL SERIES: The above F 1 crosses are used in 2 ways: (1) to produce F 2 population, and (2) to develop F 1 diallel series. Mass selection is practiced to advance the F 2 population. The F 1 diallel series is also known as multiple parent crosses because each cross involves four parents. The F 1 diallel series is designated as P 2 . 3.SELECTIVE MATING SERIES: The F1 from the multiple crosses are selfed to produce F2 population. The F2 population is used in two ways: (1) to produce F3 population by mass selection (2) to develop first selective mating series P3 by intermating selected F2 plants.: 3.SELECTIVE MATING SERIES: The F 1 from the multiple crosses are selfed to produce F 2 population. The F 2 population is used in two ways: (1) to produce F 3 population by mass selection (2) to develop first selective mating series P 3 by intermating selected F 2 plants. PowerPoint Presentation: F 1 crosses developed by selective mating are used in 3 ways Intermating to form 2 nd selective mating series P3 Crossed with new parents or new germplasm lines Selfed to produce F 2 population PowerPoint Presentation: Parent diallel series (P1) F1 F2 F3 F4 F5 line selection F1 diallel series (P2) F1 F2 F3 F4 1 st selective mating series P3 2 nd selective mating series P3 F1 F2 F1 MAIN STEPS IN DIALLEL SELECTIVE MATING SYSTEM (JENSEN,1970) Mass selection MERITS: 1) DSM is very much useful in broadening the genetic base populations by incorporation of multiple parents (germplasm lines) in the breeding programme. 2) This system is very effective in breaking undesirable linkage blocks, because it permits intermating of selected plants in segregating generations. In other words, DSM fasters genetic recombination. : MERITS: 1) DSM is very much useful in broadening the genetic base populations by incorporation of multiple parents (germplasm lines) in the breeding programme. 2) This system is very effective in breaking undesirable linkage blocks, because it permits intermating of selected plants in segregating generations. In other words, DSM fasters genetic recombination. 3) This system also results in creation of vast genetic variability for various economic characters. This is possible due to incorporation of multiple parents in the breeding programme and intermating in segregating populations. 4) In small grain crops, this system has been reported to be very effective in developing new cultivars. (Jensen 1978) : 3) This system also results in creation of vast genetic variability for various economic characters. This is possible due to incorporation of multiple parents in the breeding programme and intermating in segregating populations. 4) In small grain crops, this system has been reported to be very effective in developing new cultivars. (Jensen 1978) DEMERITS: 1)In this system, large numbers of crosses have to be made to obtain sufficient quantity of crossed seeds. This is a difficult task without the use of male sterility. 2)This system involves the handling of materials by mass selection as well as intermating in segregating populations which require more labour and space. : DEMERITS: 1) In this system, large numbers of crosses have to be made to obtain sufficient quantity of crossed seeds. This is a difficult task without the use of male sterility. 2)This system involves the handling of materials by mass selection as well as intermating in segregating populations which require more labour and space. 3)This method is less effective in improving those characters which have low heritability. 4)This system is rarely used in crop improvement and has not become very popular so far. : 3)This method is less effective in improving those characters which have low heritability. 4)This system is rarely used in crop improvement and has not become very popular so far. REFERENCE: Plant breeding by B.D.SINGH.: REFERENCE: Plant breeding by B.D.SINGH. THANK YOU: THANK YOU

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