Selection of superior recombinant is the most crucial step for the success of plant breeding.

Explanation:

Plant breeding is the science of improving the genetic characteristics of plants to create new varieties with desirable traits. It involves various steps and techniques to achieve the desired goals. Among these steps, the selection of superior recombinants plays a crucial role in the success of plant breeding. Here's why:

1. Germplasm Collection:
- Germplasm collection involves the gathering and preservation of genetic material from various plant sources.
- It provides a diverse range of genetic resources that can be utilized in breeding programs.
- However, the collection of germplasm alone does not guarantee successful plant breeding.

2. Selection of Parent:
- Selecting suitable parent plants is essential for successful breeding.
- Parents should possess desirable traits that are targeted for improvement.
- This step involves assessing the phenotypic and genotypic characteristics of potential parents.
- While important, the selection of parent plants alone does not ensure the success of plant breeding.

3. Hybridization:
- Hybridization refers to the crossing of selected parent plants to produce offspring with desired characteristics.
- This step aims to combine the favorable traits of two different parents into a single progeny.
- Hybridization is a significant step in plant breeding but does not guarantee the success of the breeding program.

4. Selection of Superior Recombinants:
- The selection of superior recombinants is the most crucial step in plant breeding.
- After hybridization, a large number of offspring are obtained, and not all will possess the desired traits.
- The selection process involves evaluating the progeny for specific traits and choosing the individuals that exhibit superior characteristics.
- These selected recombinants are then further propagated and evaluated to ensure stability and consistency of the desired traits.
- This step requires careful observation, data analysis, and scientific judgment to identify the best individuals for further breeding and variety development.
- The success of plant breeding heavily relies on the selection of superior recombinants as they serve as the foundation for the development of improved plant varieties.

In conclusion, while all the mentioned steps are important in plant breeding, the selection of superior recombinants is the most crucial for achieving success. It involves identifying and selecting the best individuals with desirable traits, which serve as the basis for further breeding and variety development.