The development of Synthetic Varieties is practiced commonly in some cross-pollinated crops. It involves several important steps as given below. Arrange the steps of synthetic variety development in chronological order i.e. from the beginning to the last:
Choose the correct answer from the options given below:
कुछ पर-परागित फसलों में संश्लिष्ट किस्मों (Synthetic Varieties) का विकास आमतौर पर किया जाता है। इसमें नीचे दिए गए कई महत्वपूर्ण चरण शामिल हैं। संश्लिष्ट किस्म विकास के चरणों को कालानुक्रमिक क्रम में व्यवस्थित कीजिए:
नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:
Method of Developing Synthetic Varieties:
- Step 1 (C) - Isolation/Collection of Inbreds: Developing or assembling a large number of diverse inbred lines or open-pollinated clones.
- Step 2 (A) - Evaluation for GCA: Evaluating all inbred lines for General Combining Ability (GCA) using topcross, polycross, or diallel mating designs, and selecting 4–10 lines with superior GCA as parents.
- Step 3 (D) - Intermating / Diallel Crossing: Growing the selected parents in isolation and intermating them in all possible combinations (diallel cross) and harvesting equal quantities of seed from each cross to compose the synthetic ($Syn_0 / Syn_1$).
- Step 4 (B) - Multiplication in Isolation: Multiplying the synthetic composite population under open pollination in isolation for 1–2 generations ($Syn_2$) to reach Hardy-Weinberg equilibrium, followed by certified seed distribution to farmers.
Correct order: (C), (A), (D), (B).
Correct Answer: Option 4.
विस्तृत व्याख्या:
Method of Developing Synthetic Varieties (संश्लिष्ट किस्म विकास के चरण):
- Step 1 (C) - Isolation/Collection of Inbreds: Developing or assembling a large number of diverse inbred lines or open-pollinated clones.
- Step 2 (A) - Evaluation for GCA: Evaluating all inbred lines for General Combining Ability (GCA) using topcross, polycross, or diallel mating designs, and selecting 4–10 lines with superior GCA as parents.
- Step 3 (D) - Intermating / Diallel Crossing: Growing the selected parents in isolation and intermating them in all possible combinations (diallel cross) and harvesting equal quantities of seed from each cross to compose the synthetic ($Syn_0 / Syn_1$).
- Step 4 (B) - Multiplication in Isolation: Multiplying the synthetic composite population under open pollination in isolation for 1–2 generations ($Syn_2$) to reach Hardy-Weinberg equilibrium, followed by certified seed distribution to farmers.
Correct order: (C), (A), (D), (B).
Correct Answer: Option 4.