Small-Grain Sterile Rice Line Breeding and Mechanized Seed Sorting
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Solution Overview
Problem
Traditional hybrid rice seed production is labor-intensive and costly, making it difficult to maintain efficient large-scale production due to the lack of suitable mechanized methods for sorting parental line seeds, particularly with small-grain male sterile lines.
Innovation Solution
A method involving breeding a small-grain male sterile rice line by crossing specific parents and using directional cultivation under stress conditions, followed by direct-seeding and mechanized sorting of seeds based on grain thickness differences to produce hybrid rice seeds efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional hybrid rice seed production methods are used with separate field management of parental lines, then seed production can be achieved, but labor input and production costs are excessively high
Solution Approach 1:
The patent combines the management of male parent and female parent lines into a single field through mixed direct-seeding, eliminating the need for separate field management. This merging of operational spaces reduces labor input for separate seeding, transplanting, and harvesting operations while maintaining the ability to produce hybrid rice seeds efficiently.
Solution Approach 2:
The patent employs natural pollen dispersal mechanisms where the male parent plants naturally pollinate the female parent plants in the mixed field, eliminating the need for manual or mechanical pollination operations. This self-service approach significantly reduces labor input while ensuring effective hybrid seed production.
2Reliability
If parental lines are planted separately and managed in different fields, then flowering time synchronization can be achieved, but the process becomes labor-intensive and costly
Solution Approach 1:
The patent selects parental lines with matched growth duration parameters (days from seeding to heading) to ensure flowering time synchronization. By carefully choosing parents with compatible developmental timelines, the system achieves reliable hybrid seed production in mixed fields without requiring complex management interventions or separate field operations.
3Extent of automation
If small-grain male sterile lines are used for seed production, then mechanized operations can be partially realized, but mechanized sorting of parental line seeds remains unachievable
Solution Approach 1:
The patent extracts the seed sorting function from the production process by using a male parent line that produces large-grained seeds with distinct physical characteristics. This extraction allows mechanical sorting devices to easily separate male parent seeds from hybrid seeds based on grain size differences, enabling full mechanization of the seed production and harvesting process.
Data Source
AI summary
A method for breeding a small-grain male-sterile rice line and a simple method for producing a hybrid rice seed are provided. The method for breeding the small-grain sterile rice line includes the following steps: crossing a female parent C815S with a male parent Qigui B to obtain a hybrid seed F1; planting the F1 and crossing the F1 with a female parent H155S to obtain a crossed hybrid seed F1′; planting the crossed hybrid seed F1′ to obtain a F2′ generation; planting an individual plant with ideal plant type, strong tillering, plant dwarf and small grain type from the F2′ generation and a F3′ generation, and then directional breeding more than two generations to obtain a seed with more than F5′ generation as the small-grain sterile rice line.