How tester are selected in recurrent selection

In recurrent selection (RS), testers are used as a means to evaluate the performance of progeny resulting from crosses. These testers are typically elite lines or varieties that possess a broad genetic base and exhibit desirable traits. The selection of appropriate testers is crucial in recurrent selection programs as they serve as the benchmark against which the performance of progeny is compared.

The choice of testers depends on several factors including:

·         Genetic Diversity: Testers should represent a diverse genetic background to capture a wide range of genetic variability present in the breeding population.

·         Adaptability: Testers should be well-adapted to the target environment(s) where the progeny will be evaluated. This ensures that the performance of progeny is assessed under conditions relevant to their intended use.

·         Desirable Traits: Testers should possess the desirable traits that are targeted for improvement through recurrent selection. These traits may include yield potential, disease resistance, stress tolerance, and other agronomic characteristics.

·       Stability: Testers should exhibit stable performance across different environments to provide reliable comparisons with the progeny.

·         Ease of Evaluation: Testers should be easy to evaluate and characterize for the traits of interest, facilitating efficient selection decisions.

·     Compatibility: Testers should be compatible with the breeding goals and objectives of the recurrent selection program.

The selection of testers is often a collaborative effort involving plant breeders, geneticists, and agronomists who assess potential candidates based on their performance data, pedigree information, and breeding objectives. Once chosen, testers are strategically incorporated into the breeding program to assess the performance of progeny and guide the selection process towards the desired breeding goals.