GRF4 Overexpression for Nitrogen Use Efficiency in Semi-Dwarf Crops
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Solution Overview
Problem
Semi-dwarf green revolution varieties of crops like wheat and rice have inefficient nitrogen use, relying heavily on nitrogen fertilizers that are costly and environmentally damaging, necessitating the development of varieties with increased nitrogen uptake and yield without losing yield benefits.
Innovation Solution
Increasing the expression or activity of the growth regulatory factor (GRF) in plants, specifically OsGRF4, to enhance nitrogen assimilation and carbon fixation, thereby improving nitrogen use efficiency and yield while maintaining plant height characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-dwarf green revolution varieties are used to maintain yield benefits, then plant height is reduced and yield is improved, but nitrogen use efficiency deteriorates
Solution Approach 1:
The patent changes the expression level parameter of GRF4 from normal to increased, which fundamentally alters the plant's nitrogen metabolism parameters. This leads to improved nitrogen uptake and assimilation efficiency while preserving the semi-dwarf phenotype and yield benefits, resolving the contradiction between yield maintenance and nitrogen use efficiency.
Solution Approach 2:
GRF4 acts as an intermediary protein that mediates between the semi-dwarf phenotype and nitrogen metabolism. By overexpressing GRF4, the patent creates a functional bridge that allows the plant to maintain reduced height while simultaneously improving nitrogen use efficiency through enhanced nitrogen uptake and assimilation pathways.
2Productivity
If nitrogen fertilizer inputs are increased to boost yield, then grain yield is improved, but environmental damage and input cost increase
Solution Approach 1:
The patent enables the plant to serve itself by overexpressing GRF4, which activates endogenous nitrogen uptake and assimilation pathways. This self-service mechanism reduces the plant's dependency on external nitrogen fertilizer inputs, thereby maintaining high yield while minimizing environmental damage associated with excessive fertilizer use.
Solution Approach 2:
By changing the GRF4 expression parameter, the patent fundamentally alters the plant's nitrogen utilization parameters, allowing it to achieve high grain yield through improved biological nitrogen fixation and assimilation rather than relying on external nitrogen fertilizer inputs, thus reducing environmental harm.
3Reliability
If GRF4 expression is increased to improve nitrogen assimilation, then nitrogen use efficiency is improved, but plant height may increase
Solution Approach 1:
The patent applies local quality by restricting the growth-promoting effects of GRF4 to specific tissues and functions. Through tissue-specific expression patterns and interaction with DELLA proteins, the overexpressed GRF4 enhances nitrogen assimilation in metabolic pathways while maintaining the semi-dwarf phenotype in terms of overall plant height, thus resolving the contradiction between nitrogen use efficiency and plant height.
Data Source
AI summary
The invention relates to methods for increasing nitrogen uptake, nitrogen assimilation, nitrogen use efficiency as well as yield in a plant, without affecting plant height, the method comprising increasing the expression or levels of a growth regulatory factor (GRF). Also described are genetically altered plants characterised by the above phenotype as well as methods of producing such plants.