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Mass selection
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Pure line selection
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1. The plant variety formed is mixture of pure lines.
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1. The plant variety formed is pure line.
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2. This method of crop improvement is practiced in both the self-pollinated and cross pollinated plants.
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2. This method of crop improvement is practiced in the self-pollinated crops.
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3. The crop which is developed will have mixture of different characters.
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3. The crop developed possess uniform characteristics.
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4. The mass selection procedures must be done every year so as to maintain the purity.
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4. The pure line variety formed can be maintained easily.
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5. The variety developed usually possesses much adaptability and stability.
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5. The variety developed usually possesses narrow adaptability and stability.
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6. The pollination is not controlled.
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6. The process of pollination has to be controlled in order to maintain self-pollination only.
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7. Mass selection creates genetic variability as it maintains heterozygosis.
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7. Pure line selection maintains homozygous condition.
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8. The new variety is not easily identifiable during the seed certification.
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8. The new variety is easily identifiable in seed certification programmes.
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