Maize Inbred PH4DR7 Hybrid Seed Production
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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, PH4DR7, is developed through careful breeding and selection, incorporating traits like male sterility, disease resistance, and drought tolerance, achieved through backcross conversion, genetic manipulation, and transformation, allowing for the creation of hybrid seeds with enhanced agronomic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional maize breeding methods are used, then stable high-yielding varieties can be developed, but the process takes six to twelve years which is time-consuming
Solution Approach 1:
The patent employs preliminary action by using male sterile lines and hybrid seed production systems that pre-establish genetic configurations for stability and high yield. The male sterile trait allows for controlled cross-pollination and hybrid seed production, eliminating the need for lengthy traditional inbreeding processes while maintaining variety stability.
Solution Approach 2:
The patent introduces male sterility as an intermediary mechanism to facilitate hybrid seed production. This intermediary trait enables controlled crossing between specific parental lines, accelerating the breeding process while ensuring genetic stability and high yield performance in the resulting varieties.
2Adaptability or versatility
If traditional breeding methods are used, then desirable traits can be combined, but the process is slow and takes multiple years
Solution Approach 1:
The patent uses preliminary action by pre-developing inbred lines with specific desirable traits (disease resistance, drought tolerance, yield components) that can be rapidly combined through controlled hybridization using male sterile systems, significantly accelerating trait combination compared to traditional methods.
Solution Approach 2:
Male sterility serves as an intermediary that enables efficient combination of desirable traits from different parental lines. The trait facilitates controlled cross-pollination and hybrid seed production, allowing rapid assembly of multiple desirable traits in a single generation rather than requiring multiple years of traditional breeding.
3Ease of manufacture
If male sterility traits are introduced, then hybrid seed production is facilitated, but genetic manipulation complexity increases
Solution Approach 1:
The patent applies the taking out principle by extracting the male fertility function through sterility traits (cytoplasmic male sterility CMS, nuclear male sterility NMS, or genetic male sterility GMS). This extraction eliminates the need for manual emasculation and simplifies hybrid seed production, allowing natural cross-pollination to occur without self-fertilization while reducing labor and operational complexity.
Data Source
AI summary
A novel maize variety designated PH4DR7 and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH4DR7 with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH4DR7 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 PH4DR7 or a locus conversion of PH4DR7 with another maize variety.