Pedigree selection

1. Submitted to:- Dr. Khursheed Hussain
Course title:- Breeding of vegetable crops
Course No.:- VSC-503
Credit load::- 2+1

2. Assignment on
PEDIGREE SELECTION

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. 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. 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. 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. A simplified schematic representation of
pedigree method

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. 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.