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Questions and Answers
What type of crops are involved in line development and maintenance breeding?
What type of crops are involved in line development and maintenance breeding?
What is the ultimate goal of line development and maintenance breeding in self and cross-pollinated crops?
What is the ultimate goal of line development and maintenance breeding in self and cross-pollinated crops?
What is referred to by the term '2 line system' in the context of line development and maintenance breeding?
What is referred to by the term '2 line system' in the context of line development and maintenance breeding?
What is the primary purpose of breeding in self-pollinated crops?
What is the primary purpose of breeding in self-pollinated crops?
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What is the result of line development and maintenance breeding in cross-pollinated crops?
What is the result of line development and maintenance breeding in cross-pollinated crops?
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Study Notes
Line Development and Maintenance in Self-Pollinated Crops
- Two-line system: A breeding method used in self-pollinated crops, involving the development of two inbred lines, which are then crossed to produce a hybrid.
- Line development: Involves identifying and selecting desired traits in a crop, followed by repeated self-pollination to fix those traits.
- Line maintenance: The process of preserving the genetic integrity of a developed line, involving continuous self-pollination and selection.
Hybrid Seed Production in Self-Pollinated Crops
- Hybrid seed production: Involves crossing two inbred lines to produce a hybrid seed, which exhibits heterosis (hybrid vigor).
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A, B, and R lines: Specialized lines used in hybrid seed production:
- A lines: Male-sterile lines used as the female parent in hybrid seed production.
- B lines: Male-fertile lines used as the male parent in hybrid seed production.
- R lines: Restorer lines used to restore fertility to the hybrid seed.
Line Development and Maintenance in Cross-Pollinated Crops
- Cross-pollinated crops: Crops that rely on external agents (e.g., insects, wind) for pollination, such as corn and sunflowers.
- Hybrid seed production: Involves crossing two inbred lines to produce a hybrid seed, which exhibits heterosis (hybrid vigor).
- Inbreeding depression: A phenomenon in cross-pollinated crops, where inbreeding leads to a decline in vigor and fertility.
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Description
This quiz covers the principles and practices of line development and maintenance in self and cross-pollinated crops, including A/B/R and 2-line systems for hybrid development and seed production.
