GA2 Oxidase Transgenic Corn for Short Stature and Lodging Resistance
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Solution Overview
Problem
There is a need for developing corn plants with increased yield and resistance to lodging through manipulation of the gibberellin (GA) pathway, as existing methods have not successfully achieved these traits in corn crops.
Innovation Solution
A recombinant DNA construct comprising a transcribable DNA sequence encoding a GA2 oxidase protein operably linked to a plant-expressible promoter is introduced into corn plants, which modulates GA levels to achieve desired traits such as shorter plant height, improved lodging resistance, and increased yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If GA pathway manipulation is applied to corn plants, then plant height is reduced and lodging resistance is improved, but yield increases are not achieved and off-types appear in female organs
Solution Approach 1:
The patent applies parameter changes by precisely controlling GA2 oxidase expression levels and timing to achieve optimal GA catabolism. By regulating the expression strength and temporal patterns of GA2 oxidase, the patent reduces plant height to semi-dwarf ranges (10-40% reduction) while avoiding the yield penalties and off-type formation associated with stronger GA pathway suppression. This precise parameter control allows simultaneous achievement of lodging resistance and yield maintenance.
2Reliability
If GA pathway manipulation is applied to corn plants, then lodging resistance is improved, but off-types appear in female organs
Solution Approach 1:
The patent applies local quality by using tissue-specific promoters (such as sh1 promoter) to drive GA2 oxidase expression specifically in vascular tissues and internodes where lodging resistance is needed, while minimizing expression in female reproductive organs. This spatially differentiated expression pattern provides lodging resistance benefits in stalks and stems while avoiding disruption of female organ development and preventing off-type formation.
Solution Approach 2:
The patent applies periodic action by controlling GA2 oxidase expression to specific developmental time windows rather than continuous expression. By using promoters that are active during specific growth stages (such as vegetative growth stages) and not during female organ development, the patent achieves lodging resistance during critical structural development while avoiding interference with subsequent reproductive development, thereby maintaining female organ uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The transgenic corn plants exhibit enhanced characteristics like shorter height, improved lodging resistance, and increased yield, with reduced GA levels in stem internodes, without significant off-types in female organs.
Implementation Method 1
A recombinant DNA construct comprising a transcribable DNA sequence encoding a GA2 oxidase protein... modulates GA levels... with reduced GA levels in stem internodes
Data Source
AI summary
The present disclosure provides compositions and methods for altering gibberellin (GA) content in corn plants. Methods and compositions are provided for ectopically or transgenically expressing a GA2 oxidase in corn plants. Modified plants, plant parts and plant cells having a recombinant DNA construct for expression of a GA2 oxidase transgene are further provided that may comprise reduced gibberellin levels and improved characteristics, such as reduced plant height and increased lodging resistance, but without off-types.