Clonal Seed Production via RNA Methylation Defects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current agricultural practices require repeated purchase of seeds for desirable traits as hybrid seeds lose agronomic value due to natural sexuality, leading to increased costs and loss of desirable characteristics over generations, while apomictic plants can maintain these traits through clonal reproduction.
Innovation Solution
Methods for obtaining clonal seeds by using maternal plants defective in RNA-dependent DNA methylation pathway genes, which are unable to be pollinated, and subsequent sorting of seeds to separate clonal from non-clonal seeds, potentially using gametocides or emasculation to enhance seed production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hybrid seeds are used for cultivation, then desirable agronomic traits are improved in the first generation, but the traits are lost in subsequent generations due to natural sexuality and separation of genetic traits
Solution Approach 1:
The invention segments the seed population into two distinct groups: apomictic seeds that clone the hybrid genotype and maintain desirable traits indefinitely, and sexual seeds that follow normal Mendelian inheritance. This segmentation allows farmers to selectively save and replant only the apomictic seeds, breaking the annual seed replacement cycle while maintaining trait reliability.
Solution Approach 2:
The invention changes the fundamental parameter of seed reproduction from sexual (meiotic) to asexual (mitotic) by inducing apomixis. This parameter change transforms the seed production process, enabling the hybrid genotype to be cloned and propagated true-to-type across multiple generations, thereby eliminating the need for annual hybrid seed purchases.
2Reliability
If vegetative reproduction techniques are used to preserve plant traits, then genetic fidelity is maintained, but cultivation costs increase significantly
Solution Approach 1:
The invention uses apomixis as a natural copying mechanism that produces clonal seeds identical to the parent plant's genotype. This copying process occurs through the plant's natural seed production system rather than requiring artificial vegetative propagation techniques, thereby maintaining genetic fidelity while avoiding the high costs associated with tissue culture, grafting, or other specialized vegetative reproduction methods.
Solution Approach 2:
The apomictic plants perform self-service by producing clonal seeds through their own natural reproductive system. This eliminates the need for external intervention, specialized equipment, or labor-intensive procedures required by vegetative reproduction methods, thereby dramatically reducing cultivation costs while maintaining genetic fidelity.
3Reliability
If apomixis is induced in cultivated plants, then clonal seed production and trait preservation are achieved, but the complexity of seed production processes increases
Solution Approach 1:
The invention introduces dynamics into the seed production process by allowing plants to switch between sexual and apomictic reproduction modes. This dynamic capability enables the same plant population to produce both conventional sexual seeds and clonal apomictic seeds, providing flexibility in seed production strategies without requiring entirely separate production systems.
Solution Approach 2:
The invention uses chemical agents or genetic modifiers as intermediaries to induce apomixis in cultivated plants. These intermediaries temporarily alter the reproductive pathway to produce apomictic seeds, which can then be selected and propagated. This intermediary approach allows induction of apomixis without permanently altering the plant's genetic makeup, thereby managing process complexity while achieving clonal preservation.
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
Enables the production of clonal seeds that maintain the genetic traits of the maternal plant, allowing for recurrent sowing and preservation of high-performing plant varieties, reducing the need for continuous seed purchases and promoting sustainable agricultural practices.
Implementation Method 1
maternal plants defective in RNA-dependent DNA methylation pathway genes
Data Source
AI summary
Disclosed are methods of obtaining clonal seeds, methods of plant cloning, methods of screening for maternal plants that produce clonal seeds asexually and methods of increasing yield of clonal seeds. Also disclosed are constructs comprising a nucleic acid that may silence the activity of a RNA-dependent DNA methylation pathway gene. Further disclosed are maternal plants comprising a construct wherein the construct comprises an exogenous nucleic acid sequence, wherein the construct renders the maternal plant defective for RNA-dependent DNA methylation.