Hybrid Mushroom Strain Development Using Bridging Cross
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Solution Overview
Problem
The mushroom industry faces challenges in developing novel Agaricus bisporus strains that combine desirable traits without relying on special 'bridging cross strains', particularly with the genetic material of strain BP-1, which often results in hybrids lacking acceptable agronomic characteristics.
Innovation Solution
Development of a new heterokaryotic strain, B12998, and related strains that can be used to produce hybrid mushroom cultures with improved traits, allowing for matings with BP-1 without the need for a special bridging cross strain, and incorporating genetic material from diverse lineage groups like Somycel 76 and Somycel 53 to create genetically diverse and commercially viable mushroom strains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hybridization is performed using strain BP-1 with conventional commercial strains, then genetic diversity is increased, but the resulting hybrids lack acceptable agronomic characteristics
Solution Approach 1:
The patent uses a bridging cross strain (BCS) as an intermediary between strain BP-1 and conventional commercial strains. The BCS possesses specific genetic characteristics that enable successful hybridization with BP-1 while producing offspring with acceptable agronomic traits. This intermediary approach allows the genetic material of BP-1 to be incorporated into commercial strains without directly causing the problems that occur when BP-1 is crossed with conventional strains alone.
2Stability of the object's composition
If the mushroom industry relies on a single genetic lineage for commercial production, then production consistency is improved, but the risk of catastrophic crop failure increases
Solution Approach 1:
The patent changes the genetic parameter of the mushroom population by introducing novel hybrid strains with diverse genetic backgrounds. Instead of maintaining a single genetic lineage, the industry can now use multiple genetically distinct strains (including those derived from BP-1 through the BCS bridging approach) that all produce acceptable agronomic characteristics. This parameter change from monoculture to polyculture maintains production consistency across different strains while securing against catastrophic failure.
3Productivity
If novel hybrid strains are developed to combine multiple desirable traits, then productivity and profitability are improved, but the complexity of strain development increases
Solution Approach 1:
The patent performs preliminary action by pre-developing the bridging cross strain with the specific genetic characteristics needed to facilitate successful hybridization. Rather than attempting direct complex multi-parent hybridizations, the BCS is prepared in advance as a ready-to-use intermediary that simplifies subsequent breeding operations. This preliminary development of the BCS reduces the overall complexity of developing novel hybrid strains by providing a standardized tool for incorporating BP-1 genetics into commercial lines.
Data Source
AI summary
A culture of the Agaricus bisporus strain B12998 is provided, the culture of the strain B12998 having been deposited under the NRRL Accession Number 50902. Other embodiments include a hybrid strain of Agaricus bisporus having BP-1 as one parent and an OW, SW, HW or experimental BW strain as a second parent. Still other embodiments include a hybrid strain of Agaricus bisporus having strain B12998 as at least one parent. Methods are provided for obtaining offspring including homokaryotic lines from select hybrid strain cultures of Agaricus bisporus, as well as methods and processes for producing hybrid mushroom cultures. A method of mushroom strain development is further provided.