MADS-Box Expression Control in Shorter Maize for Dense Planting
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Solution Overview
Problem
Existing maize plants face challenges in achieving increased grain yield and efficient agronomic traits, which are influenced by factors such as genomic location, transgene expression, and environmental conditions, necessitating improved breeding and transgene constructs for commercial success.
Innovation Solution
Introduce a genetic modification in maize plants with a heterologous regulatory polynucleotide encoding a polypeptide at least 95% identical to SEQ ID NO: 1, targeting genomic loci related to gibberellic acid biosynthesis, auxin transport, or brassinosteroid signaling, to reduce plant height by 5-50% and enhance yield, allowing for higher planting densities and improved nitrogen use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plant height is reduced by introducing stature reducing genetic modification, then planting density can be increased, but grain yield may be compromised
Solution Approach 1:
The patent changes the genetic parameters of the plant by introducing a heterologous regulatory polynucleotide that modifies gene expression levels. This alters the plant's developmental parameters to achieve reduced height (5-50%) while maintaining or improving yield through optimized hormonal pathways (gibberellic acid, auxin, brassinosteroid) that control both stature and productivity
Solution Approach 2:
The introduced genetic modification serves multiple functions simultaneously: it reduces plant height to enable higher planting density, maintains grain yield through compensatory mechanisms, improves standability by reducing lodging risk, and enhances nitrogen use efficiency. The single transgenic event addresses multiple agronomic traits that work together to improve overall productivity
2Productivity
If transgene expression is increased to enhance yield, then grain yield improves, but performance becomes impacted by genomic location, copy number, and environmental factors
Solution Approach 1:
The patent extracts the problematic elements (genomic location effects, copy number variations, environmental sensitivities) by using a carefully designed heterologous regulatory polynucleotide that operates independently of these variables. The construct is engineered to provide consistent expression across different genomic locations and environmental conditions, isolating the yield enhancement effect from confounding factors
Solution Approach 2:
The heterologous regulatory polynucleotide acts as an intermediary that mediates between the transgene insert and the plant's endogenous regulatory networks. This intermediary element (promoter/regulatory sequence) buffers the effects of genomic location and copy number, providing stable expression that is less sensitive to environmental variations while still achieving enhanced yield
3Productivity
If planting density is increased to improve yield, then grain yield per acre increases, but plant standability and lodging resistance may deteriorate
Solution Approach 1:
The patent changes the physical parameter of plant height through genetic modification, creating a new parameter state (reduced stature) that fundamentally alters the plant's mechanical properties. This parameter change improves standability and lodging resistance while allowing higher planting densities, as the shorter plants have lower center of gravity and reduced leverage from wind forces that cause lodging
Data Source
AI summary
The compositions and methods relate to shorter stature corn plants having an increased and extended expression of a MADS-box polypeptide along with one or more genetic modifications that result in shorter stature.