What is isolation distance?
Isolation distance is the specified distance from a known or potential contaminant. An acceptable level of contamination is expected from that object.
| Major subject | Plant breeding |
| Category | Plant breeding and genetics |
| Type | Educational, B.Sc. and M.Sc. in Agriculture |
Also read: Plant Breeding Objective Questions
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Why is it essential?
Isolation of seed crop is essential to avoid genetic and physical impurities. Genetic or varietal purity may be deteriorated by cross pollination from the nearby plants. Physical impurities may occur due to physical or mechanical admixture with other crop species or varieties from the nearby plots.
It is essential to protect the seed crops from these sources of contamination for maintaining genetic and physical impurities.
How is it affected?
I.D. is affected by mode of pollination, pollination activities as well as direction and velocity of wind.
How does it work?
The increase in natural cross pollination percentage requires increasing I.D.
Also read: Plant Breeding, Genetics, Multiple Choice Questions (MCQ)
01: 150 m distance for loose smt susceptible wheat if infection is more than 0.1% in foundation seed and 0.5% in certified seed.
02: Maintain isolation from other varieties.
Isolation from the same variety not confirming to varietal purity requirements to varietal purity requirements for certification.
03: Distance will be 5 m from the varieties of other species of different ploidy level.
5 m distance in certified seeds blocks of parental lines of the same hybrid.
04: Isolation from the other variety not confirming to varietal purity requirements to varietal purity requirements for certification.
05: Other varieties of the same species, the same variety not confirming to varietal purity requirements for certification.
Examples: Salad and other Brassica spp.
06: Other variety, the same variety not confirming to varietal purity requirements for certification.
07: Isolation from Abelmoschus manihot, Abelmoschus moschatus.
These are objectionable weeds of okra.
08: Isolation from Brassica oleracea varieties, brussels sprouts, cauliflower, collards and kale, knol-khol.
09: Other variety, the same variety not confirming to varietal purity requirements for certification.
10: Other variety, the same variety not confirming to varietal purity requirements for certification.
Also read: Genetics and Plant Breeding Important Terminologies