DIAT Gene Overexpression for Plant Drought Stress Tolerance

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Solution Overview

Problem

Current methods for enhancing drought stress tolerance in plants are inadequate, particularly in addressing the increasing severity of drought due to global climate change, and existing technologies do not effectively utilize the Oryza sativa-derived DIAT gene for improving crop productivity.

Innovation Solution

The method involves transforming plant cells with a recombinant vector containing the Oryza sativa-derived DIAT gene to overexpress the DIAT protein, which enhances drought stress tolerance by increasing the accumulation of branched-chain amino acids, acting as compatible osmolytes, thereby improving the plant's osmotic balance and membrane integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional methods are used to enhance drought stress tolerance in plants, then some level of tolerance improvement is achieved, but the tolerance is insufficient to address increasing drought severity due to climate change

Engineering Contradiction:

Improvedrought stress toleranceVSAvoidcrop productivity under severe drought

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention changes the biochemical parameters of the plant by introducing the DIAT gene, which alters amino acid metabolism pathways. This leads to increased accumulation of stress-protective compounds (proline, glycine betaine, free amino acids) that fundamentally change the plant's physiological response to drought, enabling survival under conditions where conventional varieties fail

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite biochemical system within the plant by introducing foreign gene material (DIAT from Oryza sativa) that works synergistically with the plant's endogenous metabolism. The transgene product complements existing stress response pathways, creating a multi-layered defense system that combines conventional and enhanced mechanisms for drought tolerance

Inventive Principle:

Principle #40Composite materials

2Reliability

If existing drought tolerance mechanisms are utilized, then basic protective functions are maintained, but they cannot effectively address the increasing degree of severity of drought

Engineering Contradiction:

Improvedrought stress toleranceVSAvoidseverity of drought stress

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The DIAT gene is constitutively expressed to pre-accumulate stress-protective compounds (proline, glycine betaine, free amino acids) before drought stress occurs. This preliminary biochemical preparation ensures that protective mechanisms are already in place when drought conditions arise, allowing the plant to withstand severe stress that would otherwise be lethal

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention creates a biochemical cushion against drought stress by continuously maintaining elevated levels of compatible solutes and amino acids through DIAT overexpression. This cushion absorbs the shock of severe drought conditions, protecting cellular structures and metabolic functions from damage that would occur in conventional plants

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 overexpression of the DIAT gene in transgenic rice plants significantly increases drought tolerance, as evidenced by improved survival rates, increased branched-chain amino acid content, and enhanced agricultural traits such as grain weight and filling rate, leading to improved crop productivity under drought conditions.

Implementation Method 1

The final transamination step in BCAA biosynthesis is catalyzed by the branched-chain amino acid aminotransferase (BCAT, EC 2.6.1.42). BCATs have been thought a key regulator of BCAA accumulation under stress conditions

Methodology Applied

Scientific EffectTransamination: Chemical Bonding

Implementation Method 2

transforming a plant cell with a recombinant vector which contains a gene encoding the Oryza sativa-derived DIAT (Drought-Induced AminoTransferase) protein

Methodology Applied

Scientific EffectGenetic transformation:

Implementation Method 3

Compatible osmolytes are known to induce tolerance under drought conditions by adjusting osmotic balance, protecting structure of proteins and maintaining membrane integrity

Methodology Applied

Scientific EffectOsmotic adjustment: Osmosis

Data Source

PatentUS11046970B2DIAT gene derived from <i>Oryza sativa </i>controlling drought stress tolerance of a plant and uses thereof

Publication Date: 2021.06.29 SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

AI summary

A method for controlling drought stress tolerance of a plant includes transforming a cell of the plant with a recombinant vector which includes a gene encoding Oryza sativa-derived DIAT (Drought-Induced AminoTransferase) protein to control expression of the gene encoding the DIAT protein. As the drought stress tolerance of a plant can be enhanced by the DIAT gene of the present invention, it is expected that a plant having drought stress tolerance is developed and used for enhancement of the productivity of crops.