Hybrid Corn CH576533 Breeding via Male Sterility and Backcrossing
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Solution Overview
Problem
Current corn breeding techniques face challenges in developing hybrid varieties that combine desirable traits such as high yield, disease resistance, and uniformity, while maintaining genetic stability and avoiding self-pollination, which limits the efficiency of trait introduction and hybrid seed production.
Innovation Solution
The development of the hybrid corn variety CH576533, which incorporates cytoplasmic or nuclear factors for male sterility and genetic loci conferring traits like herbicide resistance, disease resistance, and altered metabolism, along with a method for controlled cross-pollination using emasculation and self-incompatibility systems to produce hybrid seeds with specific characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If self-pollination is allowed in corn breeding, then genetic stability is maintained, but hybrid seed production efficiency decreases due to unwanted self-pollination
Solution Approach 1:
The patent applies preliminary action by inducing male sterility in the female parent before pollination occurs. This prevents self-pollination in advance, ensuring that only controlled cross-pollination with the male parent can occur, thereby提高 hybrid seed production efficiency while maintaining genetic stability through controlled breeding.
Solution Approach 2:
The patent uses an interspecific hybrid (S. arvenris × S. vulgaris) as an intermediary to transfer the male sterile trait from wild mustard to cultivated Brassica species. This intermediary approach enables the introduction of self-incompatibility mechanisms that prevent self-pollination while maintaining genetic stability through controlled cross-breeding programs.
2Productivity
If male sterility is induced to prevent self-pollination, then hybrid seed production efficiency improves, but breeding process complexity increases
Solution Approach 1:
The patent extracts and utilizes the natural self-incompatibility mechanism from the interspecific hybrid (S. arvenris × S. vulgaris) to induce male sterility. By taking out this pre-existing biological mechanism rather than creating artificial sterility systems, the breeding process complexity is minimized while still achieving efficient hybrid seed production through prevented self-pollination.
3Adaptability or versatility
If interspecific hybridization is used to introduce new traits, then genetic diversity and trait introduction improve, but genetic stability and uniformity decrease
Solution Approach 1:
The patent applies preliminary action by performing repeated backcrossing (BC1, BC2, BC3 generations) to progressively restore genetic uniformity after interspecific hybridization. This systematic approach allows new traits from S. arvenris to be introduced while gradually recovering the genetic stability and uniformity of the cultivated S. vulgaris parent through multiple generations of controlled breeding.
Solution Approach 2:
The patent employs feedback mechanisms through phenotypic selection at each backcrossing generation, where plants exhibiting desired traits and recovering parental characteristics are selected for further breeding. This feedback-driven selection process ensures that genetic uniformity is progressively restored while retaining beneficial traits from the interspecific hybrid.
Data Source
AI summary
According to the invention, there is provided seed and plants of the hybrid corn variety designated CH576533. The invention thus relates to the plants, seeds and tissue cultures of the variety CH576533, and to methods for producing a corn plant produced by crossing a corn plant of variety CH576533 with itself or with another corn plant, such as a plant of another variety. The invention further relates to genetic complements of plants of variety CH576533.