Maize MADS-Box Gene Editing for Grain Yield Improvement
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Solution Overview
Problem
There is a need to increase yield in agricultural crops to meet the growing global demand, and existing methods are inadequate in achieving significant improvements.
Innovation Solution
Genome editing techniques using CRISPR-Cas endonucleases and other targeted genetic modifications are employed to modulate the expression levels and activities of MADS-box transcription factors in maize, introducing heterologous promoters like ZmGOS2 to enhance grain yield and photosynthetic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing agricultural methods are used, then current yield levels are maintained, but significant yield improvement cannot be achieved to meet growing global demand
Solution Approach 1:
The patent applies parameter changes by modifying the expression levels of MADS-box transcription factors through genetic engineering. Specifically, it introduces heterologous promoters (like ZmGOS2) to drive overexpression of endogenous MADS-box genes (such as ZmMADS28), thereby changing the biochemical parameters of plant development to achieve superior grain yield and photosynthetic activity
Solution Approach 2:
The patent uses heterologous promoters as intermediary elements to mediate the overexpression of MADS-box transcription factors. These promoter sequences act as mediators that recruit the transcriptional machinery to drive enhanced expression of the target genes, ultimately leading to improved agronomic characteristics
2Productivity
If genome editing techniques are used to modify MADS-box transcription factors, then grain yield and photosynthetic activity are enhanced, but genetic modification complexity increases
Solution Approach 1:
The patent employs CRISPR-Cas9 genome editing technology to create preliminary genetic modifications in plant cells. By using guide RNAs to direct Cas9 endonuclease to specific genomic loci of MADS-box genes, the system performs targeted modifications (such as promoter replacements or insertions) before plant regeneration, simplifying the overall breeding process compared to traditional methods
Solution Approach 2:
The patent replaces traditional mechanical breeding methods (crossing, selection, and screening over multiple generations) with molecular biology-based genome editing. This substitution of mechanical breeding with precise molecular techniques reduces the time and complexity involved in achieving desired genetic modifications
Data Source
AI summary
Genome edited plants, plant cells, seeds and plant parts of maize are provided where expression levels and/or activities of MADS-box transcription factors are modulated to improve one or more agronomic characteristics such as grain yield. Also provided are compositions comprising polynucleotides encoding polypeptides and guide RNAs targeted to endogenous maize MADS-box proteins including for example, targeted site-directed mutagenesis using CRISPR-associated nucleases. Additionally, various methods of employing the polynucleotides and genetic modifications in plants, such as methods for modulating expression level in a maize plant and methods for increasing yield of a maize plant are also provided herein.