Cotton Cultivar DP 121 RF Breeding via Molecular Markers

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Solution Overview

Problem

Cotton breeding is a time-consuming and unpredictable process due to the complexity of inheritance and the lack of control over genetic combinations, making it difficult to develop superior cotton cultivars with desirable traits such as herbicide resistance, disease resistance, and improved fiber quality.

Innovation Solution

The development of the cotton cultivar DP 121 RF, which includes a transgene for herbicide tolerance and can be used in self-pollination, backcrosses, and hybrid breeding to produce plants with specific traits like herbicide resistance, disease resistance, and enhanced fiber quality, utilizing molecular markers for genetic selection and tissue culture for regeneration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional cotton breeding methods are used, then genetic diversity and trait combination are achieved through natural inheritance, but the breeding process becomes time-consuming and unpredictable due to complexity of inheritance

Engineering Contradiction:
Improvepredictability of trait inheritanceVSAvoidbreeding cycle duration
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces conventional mechanical breeding methods (manual crossing, selection, and evaluation) with molecular marker-based selection systems. Specific molecular markers (e.g., M1, M2, M3 markers) are used to directly identify and select plants with desired genetic traits, substituting the slow, unpredictable mechanical process of traditional breeding with a precise, accelerated molecular detection system that reduces breeding cycle time while improving predictability

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces molecular markers as intermediary indicators that mediate between genetic traits and phenotypic expression. These markers serve as detectable proxies for complex inherited traits, allowing breeders to screen for desired characteristics (herbicide resistance, fiber quality, disease resistance) without waiting for full phenotypic development, thus accelerating the breeding process while maintaining reliability

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If multiple generations of selection and testing are performed to ensure superior traits, then cultivar quality and trait stability are improved, but the development time and resource expenditure increase significantly

Engineering Contradiction:
Improvecultivar quality and trait stabilityVSAvoidbreeding efficiency
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent performs preliminary genetic selection using molecular markers at early breeding stages (e.g., F2 or F3 generations) rather than waiting for later generations. By screening for desired traits using specific molecular markers early in the breeding process, the method eliminates unwanted genetic combinations before they propagate through multiple generations, ensuring trait stability while reducing the number of generations required for cultivar development

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent replaces repetitive mechanical selection and field testing across multiple generations with a molecular marker-based selection system. This substitution allows for rapid, accurate identification of superior genetic combinations in single or fewer generations, maintaining cultivar quality and trait stability while dramatically improving breeding efficiency and reducing resource expenditure

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If traditional phenotypic selection methods are used, then visual assessment of plant traits is straightforward, but the true genotypic value remains masked by environmental factors and other plant traits

Engineering Contradiction:
Improveaccuracy of genetic worth estimationVSAvoidselection method complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces visual phenotypic assessment with molecular marker-based genotypic detection. Specific molecular markers (e.g., PCR-based markers, RFLP markers) directly detect the genetic composition of plants, providing precise measurement of true genotypic value independent of environmental influences or phenotypic masking, thereby significantly improving measurement precision of genetic worth

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces molecular markers as intermediary detection tools that bridge the gap between complex genotypic information and selectable phenotypic outcomes. These markers serve as simplified, direct indicators of genetic composition, allowing breeders to accurately assess true genetic worth without the confounding effects of environmental factors or other plant traits that mask genotypic value in traditional visual selection

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentUS7638683B2Cotton cultivar DP 121 RF
Publication Date: 2009.12.29 MONSANTO CO

AI summary

A cotton cultivar, designated DP 121 RF, is disclosed. The invention relates to the seeds of cotton cultivar DP 121 RF, to the plants of cotton DP 121 RF and to methods for producing a cotton plant produced by crossing the cultivar DP 121 RF with itself or another cotton variety. The invention further relates to hybrid cotton seeds and plants produced by crossing the cultivar DP 121 RF with another cotton cultivar.