Maize Inbred PH4BV4 Breeding via Doubled Haploid Technology
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Solution Overview
Problem
The development of new maize varieties is a time-consuming process that takes six to twelve years, and there is a continuous need for stable, high-yielding maize varieties with improved traits such as disease resistance, drought tolerance, and better agronomic characteristics.
Innovation Solution
A novel maize variety, PH4BV4, is developed through careful breeding and selection, incorporating traits like male sterility, disease resistance, and improved agronomic characteristics, using techniques such as backcross conversion and genetic transformation, and can be used to produce hybrid seeds through specific crossing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional breeding methods are used to develop new maize varieties, then the varieties can be stable and high-yielding, but the development process takes six to twelve years
Solution Approach 1:
The patent applies preliminary action by using doubled haploid technology to create inbred lines in a single generation rather than requiring multiple generations of selfing. This preliminary creation of homozygous lines accelerates the breeding process while maintaining the stability and yield consistency that would otherwise require six to twelve years to achieve through traditional sequential selection and mating processes.
Solution Approach 2:
The patent changes the temporal parameter of the breeding process by utilizing molecular markers and genomic selection to evaluate and select lines based on genetic merit rather than waiting for phenotypic expression through multiple growth cycles. This parameter change in selection timing and methodology reduces the breeding cycle duration while maintaining variety reliability.
2Adaptability or versatility
If multiple breeding steps are performed to achieve desired traits, then the variety can have improved disease resistance and agronomic characteristics, but the process becomes more complex and time-consuming
Solution Approach 1:
The patent segments the breeding program into distinct modular components: (1) creation of divergent inbred lines using doubled haploids, (2) evaluation of lines for specific traits including disease resistance and agronomic characteristics, (3) selection of superior lines, and (4) development of hybrids. This segmentation allows each component to be optimized independently and reduces overall program complexity by making the multi-step process more manageable and systematic.
Solution Approach 2:
The patent introduces molecular markers and genomic selection indices as intermediaries between the breeding objectives and the actual selection process. These intermediaries enable simultaneous evaluation of multiple traits (disease resistance, agronomic characteristics, yield potential) without requiring separate sequential selection steps, thereby reducing program complexity while achieving comprehensive trait improvement.
3Stability of the object's composition
If inbred lines are developed through extensive selfing, then homozygosity is achieved, but the process requires multiple generations and resources
Solution Approach 1:
The patent replaces the mechanical biological process of repeated selfing and natural meiosis with an artificial in vitro system. Doubled haploid technology uses tissue culture and chromosome doubling to achieve homozygosity in a single generation, substituting the time-consuming natural breeding mechanism with a laboratory-based cellular process that achieves the same genetic outcome much faster.
Solution Approach 2:
The patent utilizes phase transitions in plant development by transitioning from vegetative tissue culture phases to reproductive phases through controlled pollination and chromosome doubling. This phase transition approach allows the creation of homozygous inbred lines by manipulating the developmental stages at the cellular level rather than waiting for multiple generational cycles, significantly reducing the time required while achieving complete homozygosity.
Data Source
AI summary
A novel maize variety designated PH4BV4 and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH4BV4 with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH4BV4 through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby are provided. Hybrid maize seed, plants or plant parts are produced by crossing the variety PH4BV4 or a locus conversion of PH4BV4 with another maize variety.