Differentiate between inbred line and a hybrid variety of crop. Explain the steps involved in the production of Hybrid variety.

Hi Rajkrishnan,
Please find below the solution to the asked query:

Inbred lines (also known as inbred strains) are nearly identical individuals of a particular species. They are related in their genotypes due to long inbreeding.
Hybrid lines are the first filial generation of offsprings which have different parents.

Hybridization is the process by which two dissimilar plants with desired characteristics are mated or crossed. The resultant plant will have the characteristics of both the parent plants. 
In hybridization, two plants are selected having desirable traits and the pollen bearing anthers of female plant are removed so that only the selected male pollen can pollinate it. The hybrid plants produced by this method will display desirable traits of both parent plants. 
Steps involved in the production of Hybrid variety
Collection of genetic variability
  • Genetic variability is availed from the wild relatives of the crop. Hence, all the wild varieties and relatives of the crop are collected and preserved. The natural genes available in a population are utilised by this method. Entire collection of plants/seeds (wild types/relatives) of the given crop, which has all the diverse alleles for all genes is called germplasm collection.
Evaluation and selection of parents: 
  • From the available genetic variability, the germplasm is analysed and evaluated to identify the plants with desirable traits.
Crop hybridisation among selected parents
  • Two selected parents are crossed (hybridised). This facilitates the combination of desired traits from two different plants. Pollen grains from one plant are dusted over the stigma of the other plant.
Selection of superior recombinants
  • Among the hybrid progeny, those plants are selected which have the desired character combination. Careful scientific evaluation of progeny is required for selection. This step yields the plant that is superior to both the parents. 
Testing, release and commercialisation
  • Selected yields are evaluated for traits like quality, disease resistance, insect resistance, etc. These crops are grown in research fields and their performance is recorded under ideal conditions. This crop is then grown by farmers at several locations, for at least three growing seasons. The crop is evaluated by comparing with the best available local crop cultivar (which acts as a reference).
Hope this information will clear your doubts about the the inbred and hybrid line and the steps involved in production of Hybrid variety.
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