Microspore Culture for Doubled-Haploid Apiaceae
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Solution Overview
Problem
Current methods for generating doubled-haploid plants from microspores in species like fennel and caraway are inefficient due to low frequency of occurrence, limited applicability, and high rates of albino plant formation, with varying success across cultivars and genetic backgrounds, making it challenging to achieve rapid selection of desirable traits.
Innovation Solution
A process involving cultivating microspore donor plants under specific conditions, isolating microspores at the uninucleate to early binucleate stage, and culturing them in media with optimal mineral and carbohydrate compositions, including sucrose and brassinosteroids, to induce embryo development and generate doubled-haploid plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to generate doubled-haploid plants from microspores, then the process can be attempted, but the frequency of occurrence is low and the rate of albino plant formation is high
Solution Approach 1:
The patent applies parameter changes by optimizing culture medium composition (specific minerals, carbohydrates, and plant growth regulators), controlling incubation temperature (25-30°C), and timing of microspore isolation to maximize embryo formation while minimizing albino plant development. These parameter optimizations directly address the contradiction by improving productivity while reducing harmful outcomes.
Solution Approach 2:
The patent converts the harmful effect of albino plant formation into a beneficial selection mechanism by using the albino phenotype as a marker to identify and eliminate non-viable or genetically abnormal plants, thereby improving the overall reliability of the doubled-haploid production process.
2Ease of manufacture
If microspore culture is performed without optimized conditions, then the process is simpler, but success varies across cultivars and genetic backgrounds
Solution Approach 1:
The patent develops a universal culture medium formulation and protocol that can be applied across multiple Apiaceae species and cultivars. The medium contains specific combinations of minerals, carbohydrates, and plant growth regulators that function effectively across different genetic backgrounds, making the method broadly applicable while maintaining standardized procedures.
Solution Approach 2:
The patent optimizes specific cultural parameters including temperature (25-30°C), light conditions, and medium composition to create a standardized protocol that works across diverse cultivars. These parameter changes ensure adaptability while maintaining ease of manufacture through standardized procedures.
3Productivity
If rapid selection of doubled-haploid lines is pursued, then breeding efficiency improves, but the complexity of optimizing culture conditions increases
Solution Approach 1:
The patent employs preliminary action by pre-optimizing and standardizing all culture conditions before actual microspore culture begins. The culture medium formulation, incubation parameters, and timing protocols are predetermined and standardized, allowing rapid execution of the breeding process without complex optimization during implementation.
Solution Approach 2:
The patent establishes specific parameter ranges (temperature 25-30°C, defined medium composition, timing of microspore isolation) that, when implemented, enable rapid production of doubled-haploid lines. These parameter specifications simplify the process while maintaining high breeding efficiency.
Data Source
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AI summary
The present invention relates to culruring isolated microspores and the subsequent generation of doubled-haploid plant lines that are suitable for the rapid selection of plants with improved composition and agronomic performance. Processes developed for the recovery of microspore-derived embryos from fennel and caraway may be adapted to related species in the Apiaceae family including, but not limited to, fennel, carrot, dill, anise, lovage, parsnip, and laceflower.