Diplotaxus Plant Cytoplasmic Male Sterility for Hybrid Seed Production
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The cultivation of Diplotaxis tenuifolia, a species of arugula, lacks F1 hybrid plants, which are essential for uniformity, improved productivity, and disease resistance, due to the absence of cytoplasmic male sterility, making industrial-scale production challenging.
Innovation Solution
Introduction of cytoplasmic male sterility from Raphanus sativus into Diplotaxis tenuifolia through intergeneric crossing, ensuring stable and reliable hybrid seed production without self-pollination and chlorosis issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual pollination or emasculation is used to produce hybrid seeds, then cross-pollination can be achieved, but the production cost increases and industrial-scale production becomes incompatible
Solution Approach 1:
The patent employs cytoplasmic male sterility (CMS) in the female parent line, which automatically prevents self-pollination without requiring manual intervention. The sterile cytoplasm ensures that the female plant can only receive pollen from the male parent, enabling automatic cross-pollination control and making industrial-scale hybrid seed production feasible
Solution Approach 2:
The patent changes the physiological parameter of the female parent by introducing cytoplasmic male sterility, transforming it from a self-fertile state to a sterile state. This parameter change eliminates the need for manual emasculation and enables reliable cross-pollination control in industrial production settings
2Adaptability or versatility
If self-incompatibility is used to produce hybrid plants, then cross-pollination is promoted, but the seed batches become mixtures of F1 seeds and self-fertilization seeds reducing reliability
Solution Approach 1:
The patent uses cytoplasmic male sterility in the female parent, which automatically and completely prevents self-pollination without relying on self-incompatibility mechanisms. This ensures that 100% of the seeds produced are true F1 hybrids, eliminating contamination from self-fertilization and guaranteeing hybrid seed purity
Solution Approach 2:
The patent segments the reproductive function by separating male and female roles: the female parent with CMS produces only female flowers that receive pollen, while the male parent produces only pollen. This segmentation ensures complete cross-pollination and eliminates self-fertilization, producing pure F1 hybrid seed batches
3Reliability
If genetic male sterility is used, then hybrid seed production is possible, but technical difficulty increases and no genetic male sterility is known in Diplotaxis
Solution Approach 1:
The patent uses cytoplasmic male sterility as an intermediary mechanism rather than direct genetic sterility. The CMS is inherited through the cytoplasm (mitochondrial DNA) and acts as a mediator to prevent pollen formation, providing reliable male sterility without the technical complexities associated with nuclear genetic sterility systems
Solution Approach 2:
The patent copies the successful CMS system from radish (Raphanus sativus) and applies it to Diplotaxis tenuifolia through intergeneric crossing. This copying of a proven sterility system from a related species provides reliable male sterility in Diplotaxis without requiring de novo development of genetic sterility mechanisms
Data Source
Figure 1
Figure 2
AI summary
The invention relates to plants, seeds and cells of genus Diplotaxis, having a cytoplasmic male sterility, and in particular to plants, seeds and cells of the species Diplotaxis tenuifolia. The cytoplasmic male sterility is preferably that imported from Raphanus sativus, referred to as Ogura sterility. The invention also relates to a method for producing Diplotaxis tenuifolia plants having the cytoplasmic male sterility, and to the various uses of the cytoplasmic male sterility of the plants of the invention.