Pedigree Breeding Method

It is method helps for handling segregation population , and maintain the population record for every generation, which helps breeders to select lines and know the pedigree information regarding lines

1. Handling of Segregation Population: Pedigree Method Dr. Rajendragouda Patil Assistant professor Genetics and Plant Breeding School of Agricultural Sciences and Technology (SAST), NMIMS, MPTP Shirpur

2. Hybridization: crossing between genetically dissimilar plants. Intervarietal (two varieties or genotypes of same species) Interspecific (two species of the same genus) Intergeneric (two genera of the same family) Hybridization uses- 3 ways To combine several desirable traits in to single genotype To create vast genetic variability To develop hybrid varieties for commercial cultivation Methods to handle segregating population Pedigree breeding method Back cross breeding method Bulk breeding method

3. Introduction The method was described by H H Lowe in 1927 Pedigree refers to record of the ancestry of an individual selected plant The pedigree may be defined as a description of the ancestry of an individual and generally goes back to some distant ancestors It will helps to know about the parents, grand parents and great grand parents so on… Pedigree Method

4. Helps in finding out if two individuals are related by descent their ancestor and likely to have common genes It is method of genetic improvement of self pollinated crops. Superior plants are selected from segregating generation and proper record of ancestry of selected plants are maintained in each generation Each progeny in every generation can be tract back to the F2 plants from which progeny originated such record is known as pedigree-record

5. Features Application : applicable to self pollinated crop species and used to develop varieties , used for polygenic traits, in cross pollinated crops used to develop inbred lines. Record : it maintained ancestors record Selection : Artificial selection/ human selection, Natural selection is allowed in modified mass pedigree selection Time : 14-15 years Genetic nature : homozygous and homogeneous

6. Variety A Variety B - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Procedure Parents F 1 F 2 F 3 F 4 F 5 Bulk plot Space planting Plant to rows Family selection Family selection

7. Cont.… F 6 F 7 F 8 F 9 -F 12 Progeny selection Progeny selection Progeny selection Preliminary yield trial Yield trial F 5

8. Mass Pedigree Method Modified Pedigree method , was proposed by Harrington (1937) Growing of segregating population by bulk or mass selection when conditions are unfavorable Use of progeny testing/pedigree method when conditions are favorable Harlan applied in Cotton

9. Merits and demerits SN Merits Demerits 1. Provides mode of inheritance of various trait’s information Material becomes large, difficult to handle. 2. There is chance of recovering transgressive segregates The continuous record has to maintain 3. Takes 14-15 years compared to bulk method Large number of progeny are rejected 4. The value of selected plants ascertained by progeny test

10. Achievements Rice- ADT-25, Jaya, Padma , Sabarmati, Bala Wheat- NP-52, 120, 125, DWR 39, WH 331 Cotton- Digvijay , Abhadita , Sharda , Sahana Pigeon pea- T21 and Prabhat Green gram: Sheela Chick pea: Radhey Sorghum: Co 18 Tobacco: NP 222