Question:
Transgenic Brassica napus has following feature
Transgenic Brassica napus has following feature
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The Barnase gene induces male sterility, while the Barstar gene restores male fertility.
This dual-gene system is a powerful tool for hybrid seed production in self-pollinating crops.
This dual-gene system is a powerful tool for hybrid seed production in self-pollinating crops.
Updated On: Jul 22, 2026
- Rich in vitamin-C
- Herbicide tolerant
- Insect resistance
- Male sterility
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify the primary biological trait introduced into transgenic Brassica napus (rapeseed/canola) from the given options.
Step 2: Key Concepts and Approach:
Genetic engineering is used to introduce agricultural traits like pest resistance, herbicide tolerance, or reproductive modifications into crops.
In Brassica napus, the barnase-barstar system was introduced to control pollination for hybrid seed production.
Step 3: Detailed Explanation:
• Barnase-Barstar System: This system is used in plant biotechnology to produce hybrid seeds.
• Male Sterility: The barnase gene (from the bacterium Bacillus amyloliquefaciens) codes for an extracellular ribonuclease.
Expressing this gene specifically in the tapetum cells of the anther destroys the RNA in these cells, preventing pollen development.
This induces male sterility in the plant.
• Restoration of Fertility: When this male-sterile plant is crossed with a line containing the barstar gene (which inhibits the barnase enzyme), the \(F_1\) hybrid offspring regain fertility.
This is an effective method for producing commercial hybrid seeds in self-pollinating crops like Brassica napus.
Step 4: Final Answer:
The defining trait introduced into this transgenic Brassica napus variety is male sterility.
The question asks to identify the primary biological trait introduced into transgenic Brassica napus (rapeseed/canola) from the given options.
Step 2: Key Concepts and Approach:
Genetic engineering is used to introduce agricultural traits like pest resistance, herbicide tolerance, or reproductive modifications into crops.
In Brassica napus, the barnase-barstar system was introduced to control pollination for hybrid seed production.
Step 3: Detailed Explanation:
• Barnase-Barstar System: This system is used in plant biotechnology to produce hybrid seeds.
• Male Sterility: The barnase gene (from the bacterium Bacillus amyloliquefaciens) codes for an extracellular ribonuclease.
Expressing this gene specifically in the tapetum cells of the anther destroys the RNA in these cells, preventing pollen development.
This induces male sterility in the plant.
• Restoration of Fertility: When this male-sterile plant is crossed with a line containing the barstar gene (which inhibits the barnase enzyme), the \(F_1\) hybrid offspring regain fertility.
This is an effective method for producing commercial hybrid seeds in self-pollinating crops like Brassica napus.
Step 4: Final Answer:
The defining trait introduced into this transgenic Brassica napus variety is male sterility.
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