Lettuce Line RX06473469 Breeding Self-Pollination
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Solution Overview
Problem
Current lettuce breeding methods face challenges in developing uniform and high-yielding varieties due to the tedious nature of manual crossing and low seed production per cross, as well as limited genetic diversity from self-pollination, which restricts the introduction of desirable traits like herbicide tolerance, insect resistance, and disease resistance.
Innovation Solution
The development of the lettuce line RX06473469, which is homozygous and self-pollinated to ensure uniformity and stability, combined with genetic transformation techniques to introduce desired traits such as herbicide tolerance, insect resistance, and disease resistance, and the use of tissue culture for regenerating plants with specific characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual crossing is used for lettuce breeding, then genetic diversity can be introduced, but the process becomes tedious and seed production per cross is low
Solution Approach 1:
The patent utilizes lettuce's natural self-pollination capability to propagate homozygous inbred lines without requiring manual crossing for seed production. This self-service mechanism maintains genetic uniformity while achieving high seed yields, resolving the contradiction between genetic diversity introduction and productivity.
Solution Approach 2:
The breeding program is segmented into distinct phases: manual crossing is used only for initial hybrid generation to introduce genetic diversity, then self-pollination is employed for subsequent generations to produce uniform inbred lines at high productivity. This segmentation allows each method to be used where it is most effective.
2Stability of the object's composition
If self-pollination is used to develop uniform inbred lines, then genetic homozygosity and uniformity are achieved, but genetic diversity is limited
Solution Approach 1:
Manual crossing is performed as a preliminary action to create initial genetic variation and hybrid populations. Subsequent self-pollination then fixes these variations into uniform homozygous lines. This preliminary action ensures genetic diversity is introduced before uniformity is established.
Solution Approach 2:
The breeding program employs periodic alternation between cross-pollination (to introduce diversity) and self-pollination (to establish uniformity). This periodic switching allows the program to cycle between generating genetic variation and fixing it into stable, uniform lines.
3Ease of operation
If emasculation is performed before crossing, then cross-pollination can be controlled, but the process becomes more difficult and time-consuming
Solution Approach 1:
Instead of emasculating flowers before crossing to prevent self-pollination, the patent inverts the approach by allowing self-pollination to occur naturally and then using selective breeding and multiple generations of selfing to achieve the desired genetic outcomes. This inversion eliminates the time-consuming emasculation step.
Solution Approach 2:
The patent extracts and eliminates the emasculation step from the breeding process entirely. By relying on natural self-pollination followed by selective breeding, the time-consuming emasculation operation is removed while still achieving controlled genetic outcomes through systematic selection.
4Adaptability or versatility
If hybrid development is pursued, then genetic variation is increased, but seed production per cross remains low and the process is tedious
Solution Approach 1:
The patent employs self-pollination as a self-service mechanism to produce seeds from selected individuals without requiring controlled cross-pollination. This approach maintains genetic variation through selection while achieving high seed production efficiency, resolving the contradiction between genetic variation and productivity.
Solution Approach 2:
The patent creates and propagates superior genetic copies through self-pollination of selected individuals. By copying the genetics of high-performing plants through selfing and selection, the program achieves both genetic improvement and high seed production efficiency without tedious cross-pollination.
Data Source
AI summary
The invention provides seed and plants of the lettuce line designated RX06473469. The invention thus relates to the plants, seeds and tissue cultures of lettuce line RX06473469, and to methods for producing a lettuce plant produced by crossing a plant of lettuce line RX06473469 with itself or with another lettuce plant, such as a plant of another line. The invention further relates to seeds and plants produced by such crossing. The invention further relates to parts of a plant of lettuce line RX06473469, including the gametes of such plants.