Question

Statistical technique for selecting elite inbred lines from mixed population is

• A. Path and discriminant analysis
• B. Diallel analysis
• C. Adaptability analysis
• D. Stability analysis

Hint:

Whenever selection involves multiple traits simultaneously to identify elite lines, selection indexes based on discriminant functions are mathematically the most efficient approach.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
In plant breeding and genetics, selecting superior genotypes or elite inbred lines from a highly heterogeneous mixed population is a primary objective.
Because complex agronomic traits like yield are polygenic and heavily influenced by environmental interactions, direct selection based on yield alone is often inefficient.
Biometrical and statistical techniques help breeders evaluate the direct and indirect relationships among component traits and construct selection indexes.
This mathematical approach assigns weight to various traits to maximize genetic gain during selection.

Step 2: Detailed Explanation:
Discriminant function analysis is a multivariate statistical technique used to classify observations into distinct groups and construct a selection index.
In crop breeding, it allows the breeder to combine multiple desirable phenotypic characters into a single index value, maximizing the ratio of genetic variance to phenotypic variance.
This index serves as an objective tool to select elite inbred lines from a diverse mixed population.
Path coefficient analysis, developed by Sewall Wright, complements this by partitioning simple correlation coefficients into direct and indirect effects.
This analysis helps breeders understand the direct causal pathways of yield-contributing characters, ensuring that selection for one trait does not negatively impact another.
Other options like Diallel analysis are used to estimate combining ability (General Combining Ability and Specific Combining Ability) of parental lines and study gene action.
Stability analysis (such as the Eberhart and Russell model) evaluates how consistently genotypes perform across diverse environments.
Adaptability analysis measures the capability of a genotype to adjust to specific environmental conditions.
While these methods assist in genotype evaluation, path and discriminant analysis provides the direct statistical foundation for constructing selection indexes to identify elite lines.

Step 3: Final Answer:
Hence, path and discriminant analysis is the statistical technique employed for selecting elite inbred lines from mixed populations based on multi-trait criteria.