Question:
Which one of the following genetic tests is considered while grading superior trees as Elite trees?
Which one of the following genetic tests is considered while grading superior trees as Elite trees?
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A Plus tree is selected on phenotype alone, whereas an Elite tree has its genetic superiority proven through progeny trials.
Updated On: Jul 28, 2026
- Clolity testing
- Provence test
- Progeny testing
- Germition and viability test
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Tree improvement programs involve progressive selection stages.
Candidate trees are initially selected phenotypically as "Plus trees," but their genetic superiority must be scientifically validated before they can be officially graded as "Elite trees."
Step 2: Detailed Explation:
A Plus tree is selected solely on the basis of its superior phenotype (height, diameter, straightness, pest resistance) compared to its surrounding canopy.
However, phenotypic superiority can be due to favorable environmental factors rather than genetics.
To prove that these superior traits are heritable, progeny testing is conducted.
Progeny testing involves raising offspring from the Plus tree and evaluating their performance under controlled field trials.
If the progeny consistently show superior growth and traits compared to control groups, the genetic superiority of the parent is confirmed.
The parent tree is then upgraded to an Elite tree.
Provence tests evaluate geographical races, while germition tests assess seed quality.
Step 3: Fil Answer:
Progeny testing is the genetic test required to grade a Plus tree as an Elite tree.
Hence, the correct option is (C).
Tree improvement programs involve progressive selection stages.
Candidate trees are initially selected phenotypically as "Plus trees," but their genetic superiority must be scientifically validated before they can be officially graded as "Elite trees."
Step 2: Detailed Explation:
A Plus tree is selected solely on the basis of its superior phenotype (height, diameter, straightness, pest resistance) compared to its surrounding canopy.
However, phenotypic superiority can be due to favorable environmental factors rather than genetics.
To prove that these superior traits are heritable, progeny testing is conducted.
Progeny testing involves raising offspring from the Plus tree and evaluating their performance under controlled field trials.
If the progeny consistently show superior growth and traits compared to control groups, the genetic superiority of the parent is confirmed.
The parent tree is then upgraded to an Elite tree.
Provence tests evaluate geographical races, while germition tests assess seed quality.
Step 3: Fil Answer:
Progeny testing is the genetic test required to grade a Plus tree as an Elite tree.
Hence, the correct option is (C).
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