Q.You are a Botanist, working in the area of plant breeding. Describe the various steps that you will undertake to release a new variety.
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Start your 14-day free trial to unlock the full solution →Developing a new crop variety through plant breeding follows a systematic sequence: collect variability, select parents, hybridize, select superior progeny, test performance across locations, then release the variety.
As a plant breeder aiming to develop and release a new crop variety, the following systematic steps would be undertaken:
1. Collection of variability (Germplasm collection):
The entire collection of plants/seeds having all the diverse alleles for all genes in a given crop is called germplasm. Genetic variability is the basis for any breeding programme, so wild species, local varieties, and other cultivars are collected and preserved (in a germplasm bank) so they can be evaluated for useful traits.
2. Evaluation and selection of parents:
The collected germplasm is evaluated to identify plants with desirable combinations of characters, such as high yield, disease resistance, or quality traits. Pure lines are identified and selected, to be used as parents in hybridization.
3. Cross-hybridization among the selected parents:
The genes/characters selected from different parents need to be combined into a single plant. This is achieved by cross-pollinating (hybridizing) the two (or more) selected parents so that the desirable characters/genes from both parents can be recombined in the hybrid offspring. This is often laborious and time-consuming, especially ensuring cross-pollination (e.g., emasculation and bagging) in normally self-pollinating crops.
4. Selection and testing of superior recombinants:
The progeny (offspring) resulting from the crosses are selected for the desired trait combination — plants that have successfully combined the desirable characters of both parents (superior recombinants) are identified and selected. These are then self-pollinated for several generations until they achieve a state of uniformity (homozygosity), so that the characters do not segregate further in the progeny.
5. Testing, release and commercialization of new cultivars: …
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