Three line system of hybrid seed production

Three line system of hybrid seed

production

A.Murugan

Bsc.,agri

Hybrids

It begins at 20th centuary.

First generation offspring of a cross between the genetically diverse parents .

Always heterozygous.

100% cross pollination.

100% seed set is not possible.

Three line system

A line

Stable Sterility.

Well developed floral traits for outcrossing.

Easily, widespectum, strongly restored.

B line

Maintainable line.

Well developed floral traits with large pollen load.

Good combining ability.

A &B – nucleus should be same only cytoplasm

will vary.

R line

Able to restore / fertile the male fertility character.

Good combining ability.

Taller than A line.

Large pollen load, normal flowering traits.

No extra parents need for R line multiplication.

Success of hybrid seed production

• Choice of location.

• Selection of seed fields.

• Isolation.

• Cultural practices.