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Pedigree Selection

Pedigree selection

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Pedigree Selection

  1. 1. Submitted to:- Dr. Khursheed Hussain Course title:- Breeding of vegetable crops Course No.:- VSC-503 Credit load::- 2+1
  2. 2. Assignment on PEDIGREE SELECTION
  3. 3. INTRODUCTION  The pedigree method was first outlined by Love in 1927. in this method, individual plants are selected from F2 and subsequent generations, there progenies are grown, and a record of all the parent-offspring relationships is maintained. Individual plant selection is continued till the progenies become homozygous, and they show no segeration.
  4. 4. Pedigree record  In pedigree method, a detailed record of the relationships between the selected plants and there progenies is maintained; such a record is known as pedigree record are simply pedigree.  The pedigree is helpful in finding out if two individual are related by descent, i.e have a common parent in their ancestry, and therefore are likely to have some alleles in common.
  5. 5. Applications of pedigree method  Pedigree method is the most commonly used method for selection from segregating generations of crosses of self pollinated crops.  This method is often used to correct some specific weaknesses of an established variety.  This method is suitable for improving specific characteristics, such as disease resistance, plant height, maturity time, yield etc.
  6. 6. Procedure for pedigree method  Hybridization  F1 generation  F2 generation  F3 generation  F4 generation  F5 generation  F6 generation  F7generation  F8 to F10 generation  F11 generation
  7. 7. A simplified schematic representation of pedigree method
  8. 8. Merits  It is well suited for the improvement of easily identified and simply inherited characters.  It takes less time then the bulk method to develop a new variety.  Plants and progenies with visible defects and weaknesses are eliminated at an early stage in the breeding programme, this saves resourses and the time of breeders.
  9. 9. Demerits  Maintenance of accurate pedigree records takes up valuable time. Sometimes it may be a limiting factor in a large breeding programme.  The success of this method largely depends on skill of the breeder.  There is no opportunity for natural selection to influence the populations.

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