This presentation discusses hybridization techniques in rice. It begins with definitions of key terms like hybrid and homozygous. It describes the objectives of hybridization like increasing yield and developing disease resistance. The materials, floral biology, and step-by-step process of emasculation and pollination are explained. Maintaining genetic diversity through hybridization is important for crop health. Hybrid rice often displays heterosis or hybrid vigor, increasing yields. The Green Revolution widely used hybridization to create high-yielding rice varieties adapted to local conditions.

1. WELCOME
TO
PRESENTATION
ORGANIZED BY : SHAHANAZ PARVEEN
ASSISTANT PROFESSOR
DEPT. OF GENETICS AND PLANT BREEDING
SHER-E-BANGLA AGRICULTURAL UNIVERSITY

2. HYBRIDIZATION
TECHNIQUE IN
RICE

3. Group name: Gladiolous
Prepared by :

4. DISCUSSION
TOPICS
•Definition
•Objectives
•Materials Required
•Floral Biology
•Steps in Hybridization

5. What is Hybridization?
Hybrid
Homozygous
parents
Genetically
Dissimilar
Crossing

6. • The offspring that is obtained by crossing two genetically dissimilar
homozygous parents is called hybrid and the process of producing
hybrid is called hybridization.
• Yuan Longping, the "Father of Hybrid Rice", may be the most
famous in research on hybrid rice. In the 1970 s, he made his
discovery of the genetic basis of heterosis in rice. This was a unique
discovery because it had been previously thought that heterosis
was not possible for self-pollinating crops such as rice.

7. Objectives
• To create variability
• To increase the yield of grain
• To increase grain quality
• To develop early maturity variety
• To develop disease resistant variety
• To develop insect and pest resistant variety
• To improve cooking characteristics

8. MATERIALS
• Rectified Spirit
• Needle
• Scissor
• Forceps
• James Clips
• Tags
• Polythene Bags
• Bamboo Sticks
• Conical Flask
• Threads

9. FLORAL BIOLOGY
• Terminal panicle which bears perfect flower.
• Sessile,bi-sexual,self pollinated flower.
• Flower having six stamens.
• Flower surrounded by lemma and palea.
• Gynocium consists of carpel-1,superior ovary and one chambered
hypogynous.
• Most of the flowers bloom between 2-4 days.
• Blooming of the spikelets starts from panicle apex and proceeds
downward.
• Pollen shed at the time of flower opening.
• Stigma remains receptive for 4-5 days.
• Pollen preservation possible for 24 hours at 54 degree F at 95% humidity
• Fertilization completes within 3 hours after pollination

10. Diagrams
of Floral
Biology

11. STEPS IN HYBRIDIZATION

12. 1. Selection of female plants
• Insect and disease free healthy plant
• Selection of flowers expected to open by next morning
• Removal of immature and open flowers

13. 2. EMASCULATION
• Purpose of emasculation to prevent pollination
• Selection of panicles expected to open in the morning
• Selection of spikelets whose anther length about 60%
• Lemma and palea need to cut at a place 20% bellow from the tip
• Stamens need to remove one by one with sterized needle or forceps
• Best time : afternoon
• Bagging of emasculated flowers with polythene

14. EMASCULATION PROCESS

15. Diagrams of
emasculation
process

16. Mechanical
emasculation
 Mechanically
prevented of pollen
transfer
 Time saving,
extensive,quite cheap
 vacuuming of anthers
involves an aspirator
and high speed suction
of pollen from the
anthers of flowers with
a minimum damage to
the stigma.

17. 3. POLLINATION
• Process of collecting anther and pollen grains of desired male parent and
putting in the stigma at the emasculated flower of desired female parent
• Done in the next morning when the stigma is receptive
• Collection of yellow and turgid anthers from desired male plant and
putting them in bright sunlight for 15 minutes
• Temporary removal of bag from female plants and pollination is done by
dusting pollens over stigma surface of emasculated buds
• Sometimes whole anther is inserted inside the florets with the help of
forceps

18. BAGGING
• Fixation of bamboo stick
• Top of the plants with bud inside the bag
• Two james clip through holes
• Exchanges of gases
• Stop the visit of insect

19. TAGGING
• After bagging tag bear following information:
Cross combination (BR3 x BRRI dhan 29)
Date of emasculation
Date of pollination
Numbers of buds pollinated
Signature of the breeder

20. • In agriculture, it is vitally important to maintain genetic diversity to
obtain the health and longevity of a crop.
• As with other types of hybrids, hybrid rice typically displays
heterosis
• Green Revolution popularized the use of conventional
hybridization to increase yield by creating "high-yielding varieties".
• Often the handful of hybridized breeds originated in developed
countries and were further hybridized with local varieties in the rest
of the developing world to create high yield strains resistant to
local climate and diseases