TECHNIQUES FOR

BREAKING SEED

DORMANCY

HOW TO BREAK…..

Hard seed coat dormancy

light sensitive seeds dormancy

Dormancy due to chilling requirement

Immature embryo dormancy

BREAKING DORMANCY OF HARD SEED COAT

Scarification

Hot water treatment

Sulphuric acid treatment

Micro-organisms reaction

BREAKING DORMANCY OF LIGHT SENSITIVE

SEEDS

Exposure to white light

Exposure to red and far red light

Role of phytochromes

Use of plant hormones

Role of darkness

BREAKING DORMANCY OF CHILLING REQUIRING

SEEDS

Stratification

GA role

ROLE OF GROWTH PROMOTING SUBSTANCES IN

BREAKING SEED DORMANCY

Potassium nitrate

Thiourea

Ethylene chlorhydrin

Some plant hormones

RUNNING WATER TREATMENT

Running water treatment is given to seeds so

that Running water washes off the inhibitors

from the seeds and breaks dormancy