5 Questions
What type of crops are involved in line development and maintenance breeding?
Both self-pollinated and cross-pollinated crops
What is the ultimate goal of line development and maintenance breeding in self and cross-pollinated crops?
To produce hybrids and seed
What is referred to by the term '2 line system' in the context of line development and maintenance breeding?
A system used for producing hybrids
What is the primary purpose of breeding in self-pollinated crops?
To develop inbred lines
What is the result of line development and maintenance breeding in cross-pollinated crops?
Production of hybrids and seed
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.
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.
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