Maize Inbred PHVRZ Lodging Resistance and Yield Stability
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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, particularly in achieving stable and high-yielding hybrids with improved agronomic quality and resistance to environmental stresses.
Innovation Solution
Development of the novel maize variety PHVRZ, which is a homozygous line that can be used to produce hybrids with enhanced traits through crossing and locus conversion, incorporating resistance to various diseases and environmental stresses, and optimized for the Central corn belt in the United States.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional maize breeding techniques are used, then basic crop production is maintained, but desirable traits such as disease resistance, drought tolerance, and uniformity cannot be effectively combined
Solution Approach 1:
The patent employs inbred lines with specific genetic segments that have been segregated and fixed for particular desirable traits. By using inbreds like PHVRZ that are homozygous at critical loci, the breeding program segments the genome into stable, predictable units that can be reliably combined in hybrids to achieve consistent performance across multiple traits including disease resistance, drought tolerance, and uniformity.
Solution Approach 2:
The patent utilizes changes in genetic parameters through controlled crossing programs and selection processes. By modifying the genetic composition parameters of the inbred lines and their subsequent hybrids, the breeding program achieves stable combination of multiple desirable traits. The controlled manipulation of allele frequencies and genotype frequencies enables reliable hybrid performance while maintaining trait diversity.
2Productivity
If mechanical harvesting is implemented, then harvesting efficiency is improved, but uniformity of plant characteristics such as germination, stand establishment, growth rate, maturity, plant height and ear height becomes critical
Solution Approach 1:
The patent develops inbred lines with specific local genetic qualities that ensure uniform plant characteristics. The inbred PHVRZ line has been selected and fixed for consistent attributes including uniform germination, stand establishment, growth rate, maturity timing, plant height, and ear height. This local genetic uniformity within the inbred line ensures that when used in mechanical harvesting systems, the plants exhibit consistent morphology and development, enabling efficient and uniform harvesting operations.
3Reliability
If new and improved commercial crops are developed through traditional plant breeding, then agronomic quality is enhanced, but the process is time-consuming and complex
Solution Approach 1:
The patent employs preliminary action through the development and fixation of inbred lines with desired traits before they are used in hybrid production. The inbred PHVRZ line has undergone multiple generations of selfing and selection to pre-establish stable genetics for disease resistance, drought tolerance, and uniformity. This preliminary conditioning of the inbred line allows for more efficient and faster hybrid development, as the desired traits are already fixed and can be transmitted reliably to the next generation without time-consuming re-selection processes.
Data Source
AI summary
A novel maize variety designated PHVRZ and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PHVRZ with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PHVRZ 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 PHVRZ or a locus conversion of PHVRZ with another maize variety.