Sunflower Microspore Culture with HDACi for Haploid Plant Production
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Solution Overview
Problem
Existing methods for producing haploid and doubled haploid sunflower plants are inefficient and genotype-dependent, particularly in anther culture and parthenogenesis, limiting the development of competitive F1 hybrids.
Innovation Solution
A method involving isolated microspore culture with a histone deacetylase inhibitor (HDACi) and a complex protein composition is used to induce callus or embryo formation, followed by cultivation and regeneration to produce haploid, polyhaploid, or doubled haploid plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If anther culture or parthenogenesis methods are used to produce haploid plants, then some haploid plants can be obtained, but the production efficiency is very low and regeneration rates are very low
Solution Approach 1:
The patent applies parameter changes by modifying culture conditions including temperature (24-27°C), light intensity (16-20 μmol m⁻² s⁻¹), and nutrient composition (specific B5 medium formulation with adjusted sucrose concentrations) to optimize microspore culture and dramatically improve both productivity and reliability of haploid plant production
Solution Approach 2:
The patent uses isolated microspores as an intermediary between anther culture and embryo development. By isolating microspores from anthers and culturing them separately in controlled conditions, the method achieves higher regeneration rates compared to direct anther culture, resolving the contradiction between productivity and reliability
2Productivity
If conventional microspore culture methods are used, then some callus formation occurs, but efficient production of doubled haploid plants cannot be achieved
Solution Approach 1:
The patent employs specific parameter changes including culture temperature (24-27°C), light conditions (16-20 μmol m⁻² s⁻¹), and nutrient composition (B5 medium with 30g/L or 40g/L sucrose) to transform low-quality callus formation into efficient doubled haploid plant production, achieving up to 80% regeneration rate
Solution Approach 2:
The patent applies preliminary action by pre-treating microspores with specific culture conditions and nutrient compositions before embryo induction, which prepares the microspores for optimal development and significantly improves the quality of callus formation and subsequent doubled haploid plant production
3Productivity
If chromosome doubling agents are used to produce doubled haploid plants, then doubled haploid plants can be obtained, but the process requires additional chemical treatments and time
Solution Approach 1:
The patent applies self-service by enabling spontaneous chromosome doubling within the microspore culture system itself. The optimized culture conditions (temperature, light, nutrients) naturally induce chromosome doubling without requiring external chemical agents, thereby simplifying the process while maintaining high productivity
Solution Approach 2:
The patent extracts the chromosome doubling function from external chemical agents and integrates it into the culture medium composition. By incorporating specific nutrients and growth conditions in the B5 medium, the system internally generates chromosome doubling, eliminating the need for separate chemical treatment steps
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the efficient production of hundreds of haploid or doubled haploid plants from a single sunflower inflorescence, with a high spontaneous doubling rate, reducing the need for chromosome doubling agents and facilitating rapid breeding.
Implementation Method 1
contacting the isolated microspores with a histone deacetylase inhibitor (HDACi)
Data Source
AI summary
The present invention relates to a method for the production of haploid, polyhaploid and/or doubled haploid embryos, calli, seeds and/or plants of the species Helianthus annuus from isolated microspore cultures, more specifically to a method comprising contacting the isolated microspores with a histone deacetylase inhibitor (HDACi) and a complex protein composition. The present invention also provides a kit for producing a haploid, polyhaploid and/or doubled haploid embryo, callus, seed and/or plant of the species Helianthus annuus from at least one isolated microspore as well as the use of a histone deacetylase inhibitor (HDACi) and a complex protein composition for producing a haploid, polyhaploid and/or doubled haploid embryo, callus, seed and/or plant of the species Helianthus annuus. Finally, the present invention also relates to a population of haploid, polyhaploid and/or doubled haploid Helianthus annuus plants directly derived from at least one sunflower apical or lateral capitula.