recurrent selection and its application in self pollinated crop.pptx

recurrent selection

1. Recurrent Selection and Its application in Self Pollinated Crops Presented By Sourav Ranjan Nanda Adm No-231232103

2. Recurrent selection suggested by Hays and Garber Recurrent selection suggested East and Jones Early Testing by Jenkin RSGCA by Jenkin RSSCA by Hull 1919 1920 1935 1940 1945 1949 RRS by Comstock. Robinson and Harvey HISTROTY OF RECUURENT SELECTION

3. Definition Recurrent selection is a cyclical improvement method aimed at concentrating desirable alleles in a population through a process of detecting better members of a population.  Isolating an outstanding lines depends in: Proportion of superior inbred in the base population Effectiveness of selection

4. Types of Recurrent Selection Simple recurrent selection (SRS) Recurrent selection for general combining ability (RSGCA) Recurrent selection for specific combining ability (RSSCA) Reciprocal recurrent selection (RRS )

5. Simple recurrent selection (SRS) Recurrent selection for general combining ability (RSGCA) Recurrent selection for specific combining ability (RSSCA) Reciprocal recurrent selection (RRS)

6. Simple Recurrent Selection Several phenotypically superior plant selected Selected plants self pollinated Selfed seeds harvested separately Selfed seeds evaluated, superior seeds retained Individual plant progenies planted All possible intercross made Equal amounts of seed from all intercrosses composited Composited intercross seed planted Several phenotypically superior plant selected Selected plants self pollinated Selfed seeds harvested separately Selfed seeds evaluated, superior seeds retained Individual plant progenies planted All possible intercross made Equal amounts of seed from all intercrosses composited Original Population Intercross Block Composite of Intercrosses Intercross Block May be repeated As in the first recurrent selection cycle Original Selection Cycle First Recurrent Selection Cycle

7. Simple recurrent selection (SRS) Recurrent selection for general combining ability (RSGCA) Recurrent selection for specific combining ability (RSSCA) Reciprocal recurrent selection (RRS)

8. Recurrent Selection For General Combining Ability Several phenotypically superior plant selected. Selected plants self pollinated. Test crossed as males to a number of randomly selected plant from a tester with a broad genetic base. Test cross seeds and selfed seeds from each Selected plant harvested separately. Replicated yield trial conducted using testcross seeds. Superior progenies identified. Selfed seeds from the plants producing superior testcross progenies planted in a crossing block. All possible intercross made. Equal amount of seed from a\ ll the intercrosses composited . Original Selection Cycle Composited Seed From the intercrosses planted. Several phenotypically superior plant selected Selected plants self pollinated Test crossed as males to a number of randomly selected plant from a tester with a broad genetic base Test cross seeds and selfed seeds from each Selected plant harvested separately Replicated yield trial conducted using testcross seeds Superior progenies identified Selfed seeds from the plants producing superior testcross progenies planted in a crossing block All possible intercross made Equal amount of seed from a\ ll the intercrosses composited First Recurrent Selection Cycle Original Population Intercross Block Intercross Block Replicated Yield Trial Replicated Yield Trial May be repeated As in the first recurrent selection cycle composite of Intercross Tester (OPV) Test Cross SP Seeds SP Seeds Test Cross Test Cross

9. Simple recurrent selection (SRS) Recurrent selection for general combining ability (RSGCA) Recurrent selection for specific combining ability (RSSCA) Reciprocal recurrent selection (RRS)

10. Recurrent Selection For Specific Combining Ability Several phenotypically superior plant selected. Selected plants self pollinated. Test crossed as males to a number of randomly selected plant from a tester with narrow genetic base. Test cross seeds and selfed seeds from each Selected plant harvested separately. Replicated yield trial conducted using testcross seeds. Superior progenies identified. Selfed seeds from the plants producing superior testcross progenies planted in a crossing block. All possible intercross made. Equal amount of seed from a\ ll the intercrosses composited . Original Selection Cycle Composited Seed From the intercrosses planted. Several phenotypically superior plant selected Selected plants self pollinated Test crossed as males to a number of randomly selected plant from a tester with a broad genetic base Test cross seeds and selfed seeds from each Selected plant harvested separately Replicated yield trial conducted using testcross seeds Superior progenies identified Selfed seeds from the plants producing superior testcross progenies planted in a crossing block All possible intercross made Equal amount of seed from a\ ll the intercrosses composited First Recurrent Selection Cycle Original Population Intercross Block Intercross Block Replicated Yield Trial Replicated Yield Trial May be repeated As in the first recurrent selection cycle composite of Intercross Tester (inbred) Test Cross SP Seeds SP Seeds Test Cross Test Cross

11. Simple recurrent selection (SRS) Recurrent selection for general combining ability (RSGCA) Recurrent selection for specific combining ability (RSSCA) Reciprocal recurrent selection (RRS )

12. Original Population A Reciprocal Recurrent Selection Original Population B Separate field trial for population A and B SP Seeds SP Seeds Test Cross Separate Intercross Block Several superior plant selected in population in both the population selected plants self pollinated Each selected plant from population A is test crossed with several random plant from population B Test cross and selfed seed from each selected plant harvest separately Separate yield trials conducted for test cross progenies of the selected plants from population A and B. Superior progenies identified. Selfed seeds from plants that produced superior test cross progenies are planted separately for population A and B in crossing blocks. All possible intercrosses of population A are mixed together, and those of population. Seeds from all intercross of population A are mixed together and those of population B are mixed together. Original Selection Cycle Selfed Seed Cont.

13. Separate Intercross Block Composite of Intercross Separate field trial for population A and B Composite seed from intercrosses planted separately for population A and B. Several superior plant selected in population in both the population selected plants self pollinated Each selected plant from population A is test crossed with several random plant from population B Test cross and selfed seed from each selected plant harvest separately Separate yield trials conducted for test cross progenies of the selected plants from population A and B. Superior progenies identified. Selfed seeds from plants that produced superior test cross progenies are planted separately for population A and B in crossing blocks. All possible intercrosses of population A are mixed together, and those of population. Seeds from all intercross of population A are mixed together and those of population B are mixed together. First Recurrent Selection Cycle May be repeated As in the first recurrent selection cycle

14. C omparison among different Recurrent selection Recurrent Selection Effectiveness Dominance is incomplete RRS=RSGCA>RSSCA Dominance is complete RRS=RSGCA=RSSCA Overdominance RRS=RSSCA>RSGCA

15. Application in Self Pollinated Crop Can be used produce half sib progenies by Genetic Male Sterility. Selection of Single and Multiple cross and introgression of new germplasm. Effective selection of genotype having genetic variability. Inter population improvement. Overcome the difficulty imposed by undesirable genetic linkage.

16. Case studies

17. Male sterility facilitated Recurrent selection in Rice Breeding Male sterility facilitated Recurrent selection to elevate level of stem borer resistance IR36 ms /ARC10451 - - - - - - - - - - - - - - - - - - - - - - - - - - - - -IR36 ms /WC1263 IR36 ms/f 1 Bulk population with 3 staggered planting to synchronizing flowering Bulk population with 3 staggered planting to synchronizing flowering Repeat steps3 and 4 at least 2 more cycle Select fertile plant purify by the pedigree method and test BC 1 F 2 Mixed seeds Male crosses with donors Interplant F 1 with IR36 ms . Lines , with coincide flower Harvest the seed separately. Use all seed harvested from IR36 ms plants about 30 g from each F 1 to prepare bulk Grow at stem borer hotspot to coincide with peak population Grow under pest pressure . At maturity selected resistant plants and bulk Select elevated level of resistance

18. Male sterility facilitated Recurrent selection in rainfed lowland rice IR 36 ms Donors with desirable characters' for rainfed low land F 2s (Fertile) from different crosses New germplasms or lines can be added Open Pollination Open Pollination Open Pollination Self Pollination Self Pollination Self Pollination Selection and Evalution -------------------------------------------------------------------------------------------------------------------------------------------------- 25 % Sterile 75% Fertile 33 % Sterile 67 % Fertile 50 % Sterile 50 % Fertile 75 % Sterile 25 % Fertile 84 % Sterile 16 % Fertile 91 % Sterile 9 % Fertile Desired fertile harvested and handled according to pedigree In creasing Sterility   F 1 R 1 F 2 R 3 F 4 R 2 F 1 R 3 F 1 R 3 F 2 R 3 F 3