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Assignment
on
Clonal selection and it’s utilization in
fruit breeding
Clone
 Progeny of a single plant
obtained by asexual
reproduction is known as
clone.
 Crop which are propagated
asexuall...
Features of Clones
 Homogeneous constitution :- Plants of a clone have similar genetic constitution.
 Heterozygosity :- ...
Origin of Genetic variation
within Clones.
1. Somatic mutation
2. Mechanical mixture
3. Sexual reproduction
4. Segregation...
Compairision among Clones, Purelines and
Inbreds
Particulars Clone Pureline Inbred
Mode of pollination Cross pollination S...
Clonal Degeneration
The loss in vigour and productivity of clone with time is known as
clonal degeneration.
 Clonal degen...
Method of improvement
 A single outstanding plant select from a population forms the
basis of a new variety.
 The breedi...
Clonal selections
Improvement of asexually propagated crops by
selecting superior clones is known as clonal selection.
Sup...
Breeding procedure of clonal
selection
FIRST YEAR :-
a) From a mixed variable population, few hundred to few
thousand desi...
SECOND YEAR:-
Clones from the selected plants grown separately.
a) Desirable clones selected
THIRD YEAR :-
Preliminary yield trials with standard checks.
a) Selection for quality, disease resistance etc. Disease
nur...
FOURTH-SIXTH YEAR :-
Multilocation yield trials with standard checks.
a) Best clone identified for release as a new
variet...
SEVENTH YEAR :-
The best clone release as a new variety.
a) Seed multiplication for distribution begins.
Schematic
representation
of clonal
selection
Merits
1) Useful in conserving heterosis for several generations
i.e. method retains all the characteristic of the parenta...
Demerits:-
1) Highly prone to new disease of new Races.
2) Can’t create new variability.
 Papaya:-
 Pineapple:-
 Litchi:-
 Aonla:-
 Bael:-
 Pomegranate:-
– CO-1, CO-2, CO-5, CO-6, Pusa giant, Pusa dwarf.
–...
Achievements in fruit crops:-
crop
 Mango:-
.
 Grapes:-
 Guava:-
 Sapota:-
Clonal var
– Dasehari-51, Niranjan, Cardoz ...
Breeding assignment on clonal selection
Breeding assignment on clonal selection
Breeding assignment on clonal selection
Breeding assignment on clonal selection
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Breeding assignment on clonal selection

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Breeding assignment on clonal selection

  1. 1. Assignment on Clonal selection and it’s utilization in fruit breeding
  2. 2. Clone  Progeny of a single plant obtained by asexual reproduction is known as clone.  Crop which are propagated asexually or by vegetative means clonal crops.
  3. 3. Features of Clones  Homogeneous constitution :- Plants of a clone have similar genetic constitution.  Heterozygosity :- Phenotypically similar but heterozygous.  Lack of genetic variation :- Phenotypically variation present within a clone is due to environmental effect not genetically. P=G+E+GE+mu  Immortality :- Maintained by asexual reproduction  Vigorous growth :- Clonal selection is useful in conserving the heterosis far a long period of time.  Wider Adaptation :- Due to high level of heterozygosity than pure lines.
  4. 4. Origin of Genetic variation within Clones. 1. Somatic mutation 2. Mechanical mixture 3. Sexual reproduction 4. Segregation in F1
  5. 5. Compairision among Clones, Purelines and Inbreds Particulars Clone Pureline Inbred Mode of pollination Cross pollination Self pollination Cross Pollination Natural mode of reproduction Asexual Sexual Sexual Genetic makeup of plant population Heterozygous Homozygous Hetrozygous Obtain through Asexual reproduction from a single plant Natural S.P. from a single homozygous plant Artificial self pollination and selection for several generation Maintained through Asexual reproduction Natural self pollination Artificial self pollination or Close Inbreeding Used as a variety Yes Yes No (Used for Hybrid and synthetic Hybrid development) Genetic makeup of plant with in an entity Heterozygous Homozygous Almost Homozygous
  6. 6. Clonal Degeneration The loss in vigour and productivity of clone with time is known as clonal degeneration.  Clonal degeneration= Degeneration is inherent in the clone.  Degeneration may result from 1) Mutation 2) Viral diseases 3) Bacterial diseases
  7. 7. Method of improvement  A single outstanding plant select from a population forms the basis of a new variety.  The breeding behaviour of genotype of this plant is not important since there would be no further sexual reproduction.  An improved variety that has becomes variable, or from a population produces by crossing two or more clones.
  8. 8. Clonal selections Improvement of asexually propagated crops by selecting superior clones is known as clonal selection. Superior clones can be isolated from three types of materials 1) Local variety 2) Introduced variety 3) Inter crossed population
  9. 9. Breeding procedure of clonal selection FIRST YEAR :- a) From a mixed variable population, few hundred to few thousand desirable plant are selected. b) A rigid selection can be done for simply inherited characters with high heritability. c) Plant with obvious weakness are eliminated.
  10. 10. SECOND YEAR:- Clones from the selected plants grown separately. a) Desirable clones selected
  11. 11. THIRD YEAR :- Preliminary yield trials with standard checks. a) Selection for quality, disease resistance etc. Disease nurseries may be planted. b) Few outstanding clone selected.
  12. 12. FOURTH-SIXTH YEAR :- Multilocation yield trials with standard checks. a) Best clone identified for release as a new variety.
  13. 13. SEVENTH YEAR :- The best clone release as a new variety. a) Seed multiplication for distribution begins.
  14. 14. Schematic representation of clonal selection
  15. 15. Merits 1) Useful in conserving heterosis for several generations i.e. method retains all the characteristic of the parental clone for several years. 2) Highly uniform and stable 3) Effective method for genetic improvement of asexually propagated crop plants.
  16. 16. Demerits:- 1) Highly prone to new disease of new Races. 2) Can’t create new variability.
  17. 17.  Papaya:-  Pineapple:-  Litchi:-  Aonla:-  Bael:-  Pomegranate:- – CO-1, CO-2, CO-5, CO-6, Pusa giant, Pusa dwarf. – Singapore Spanish, MasmerahPuerto Rico – glorff,Saharanpur sel, swarna roopa. – NA-4, NA-5, NA-6, NA-7,NA-8,NA-10 – NB-1,NB-5, NB-6 – G-137,CO-1, YCD-1 crop Clonal variety
  18. 18. Achievements in fruit crops:- crop  Mango:- .  Grapes:-  Guava:-  Sapota:- Clonal var – Dasehari-51, Niranjan, Cardoz mankurad, Payur-1 – Pusa seedless, Thomson seedless, Perlet, Tas –e- ganesh, Sonaka, Rao sahebi, dilkhus. – L-49 Jyoti, Alandi, S-1, Arka mridula, – Cricket ball, Kirthi bharti, Badami, Baramasi, Guthi, Thagarampudi.

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