Hybrid seed production
The
varieties with heterozygous dominant and recessive genotypes will produce two
types of pollen grains. These are known as dimorphic pollen grains.
Hybridization is a process in which two different plant are crossed together to
form seeds- the hybrid seeds. To prevent self pollination in these plants it is
convenient that the female parent should have non- functional pollen grains.
Hybrid seed production involve following steps-
1) Multiplication of CMS (A) lines These are male sterile lines, which act as
female parent
.
2) Multiplication of
maintainer (B) and Restorer (R) lines-
B- Line is
the fertile variety of the plant, having same characters as (A).
R- Line
carries the genes for fertility restoration.
3) Production of hybrid
seed by crossing (A) X (R) lines.
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