CLL19 Rice Cultivar for Imidazolinone Tolerance and Red Rice Control

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Solution Overview

Problem

There is a continuing need for new herbicide-tolerant rice cultivars and hybrids that possess agronomically desirable characteristics, as existing cultivars struggle with red rice infestation and limited herbicide tolerance, complicating rice cultivation and reducing market value.

Innovation Solution

Development of a novel, herbicide-tolerant, high-yielding, semi-dwarf long-grain rice cultivar designated 'CLL19', which exhibits increased tolerance to imidazolinone herbicides due to an asparagine substitution at amino acid position 653 of the AHASL polypeptide, allowing effective weed control and improved grain yield.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional rice cultivars are grown in fields infested with red rice, then red rice contamination occurs, but herbicide tolerance is limited

Engineering Contradiction:

Improveherbicide toleranceVSAvoidred rice contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by modifying the AHASL polypeptide through a specific amino acid substitution (asparagine at position 653 instead of serine), which fundamentally changes the herbicide tolerance parameter of the rice plant, enabling it to withstand imidazolinone herbicides that effectively control red rice

Inventive Principle:

Principle #35Parameter changes

2Reliability

If existing herbicide-tolerant rice varieties are used, then some weed control is achieved, but agronomic desirable characteristics are limited

Engineering Contradiction:

Improveherbicide toleranceVSAvoidagronomic characteristics

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent achieves universality by developing a rice cultivar that simultaneously provides herbicide tolerance through the AHASL modification and maintains multiple agronomically desirable characteristics including high yield potential, good grain quality, and adaptability to different growing conditions, making it a multi-functional solution

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Quantity of substance

If red rice infestation is not controlled, then market value decreases, but herbicide application options are restricted

Engineering Contradiction:

Improvemarket valueVSAvoidherbicide application flexibility

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent changes the herbicide tolerance parameter of the rice plant through AHASL modification, which directly enables the use of imidazolinone herbicides for red rice control, thereby protecting market value and expanding herbicide application flexibility

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12550844B2Rice cultivar designated ‘CLL19’

Publication Date: 2026.02.17 BOARD OF SUPERVISORS OF LOUISIANA STATE UNIV & AGRI & MECHANICAL COLLEGE

AI summary

The herbicide-tolerant rice cultivar designated ‘CLL19’ and its hybrids and derivatives are disclosed.