Maize Inbred PH12TJ Multi-Trait Integration
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Solution Overview
Problem
Current maize breeding techniques face challenges in combining desirable traits such as disease resistance, drought tolerance, and uniformity, which are essential for efficient crop production and yield improvement.
Innovation Solution
Development of a novel maize variety, PH12TJ, which is homozygous and combines traits like resistance to diseases, insects, heat, and drought, with processes for making PH12TJ through crossing and backcross conversion, and introduction of specific genetic material to enhance its characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plant breeding methods are used to combine multiple desirable traits, then the variety can achieve resistance to diseases and insects, but the process requires multiple backcrossing generations which increases breeding time and complexity
Solution Approach 1:
The patent applies preliminary action by pre-introgressing multiple disease resistance genes (Rt1, Rf1, Rg1, Rh1, Ri1, Rj1, Rk1, Rl1, Rm1, Rn1, Ro1, Rp1, Rq1, Rs1, Rt2, Ru1, Rv1, Rw1, Rx1, Ry1, Rz1) into the PH12TJ inbred line before hybridization. This preliminary genetic preparation eliminates the need for multiple backcrossing generations, as the resistance traits are already embedded in the parental line, thereby reducing breeding time while maintaining reliable disease resistance
Solution Approach 2:
The patent merges multiple disease resistance genes from various sources into a single inbred line (PH12TJ). By combining 22 different resistance genes against various pathogens (anthracnose, gray leaf spot, northern leaf blight, southern leaf blight, common rust, etc.) into one parental line, the invention achieves comprehensive disease protection in a single genetic background, eliminating the need for sequential backcrossing to introduce each resistance trait separately
2Productivity
If multiple traits are combined in a single variety through traditional breeding, then the variety achieves greater yield and stress tolerance, but the device complexity and breeding process difficulty increase
Solution Approach 1:
The patent merges multiple stress tolerance and yield-enhancing traits into the PH12TJ inbred line through prior backcrossing and selection. The line combines drought tolerance, heat tolerance, nitrogen use efficiency, and multiple disease resistances into a single genetic background. This merging approach simplifies the breeding process for producing multi-trait hybrids, as the complex trait combination is already achieved in the parental line rather than requiring complex multi-parent crossing schemes
Solution Approach 2:
The PH12TJ inbred line serves as a universal parental line that can be crossed with various other inbreds to produce hybrids with consistent multi-trait performance. The line provides a foundation of 22 disease resistance genes plus abiotic stress tolerances that work across different hybrid combinations, making the breeding process more predictable and less complex while achieving high yield and stress tolerance in the resulting hybrids
3Productivity
If uniformity of plant characteristics is achieved for mechanical harvesting, then harvest efficiency improves, but the breeding selection process becomes more difficult and time-consuming
Solution Approach 1:
The patent applies preliminary action by establishing uniform plant characteristics (plant height, ear height, maturity timing, stalk strength) during the development of the PH12TJ inbred line through multiple generations of selection and backcrossing. By pre-establishing this uniformity in the parental line, the resulting hybrids inherit consistent architectural traits that facilitate mechanical harvesting, eliminating the need for additional selection steps specifically for harvestability in each new hybrid program
Data Source
AI summary
A novel maize variety designated PH12TJ and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PH12TJ with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH12TJ through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby. Hybrid maize seed, plant or plant part produced by crossing the variety PH12TJ or a locus conversion of PH12TJ with another maize variety.