Herbicide-Resistant Rice Cultivar Breeding for Early High Yield
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Solution Overview
Problem
There is a need for high-yielding, early-maturing, and herbicide-resistant rice cultivars that exhibit superior agronomic traits and are suitable for both dry-seeded and water-seeded production systems, particularly in regions where weedy rice and other tough grasses are prevalent.
Innovation Solution
Development of the rice cultivar CLM05, which is a high-yielding, early-maturing, short-stature medium-grain rice cultivar with resistance to AHAS-inhibiting herbicides, specifically imidazolinone herbicides, allowing for effective weed control and improved grain quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional long-grain cultivars are grown in southern states, then they receive higher market prices, but they do not provide the herbicide resistance and early maturation needed for regions with weedy rice and tough grasses
Solution Approach 1:
The patent applies parameter changes by modifying the genetic parameters of rice cultivars through breeding programs. Specifically, it combines herbicide resistance traits (improving reliability) with high-yielding genetics (improving productivity) to create new cultivars like CLM05 that excel in both parameters simultaneously, resolving the contradiction between herbicide resistance and grain yield.
2Loss of time
If rice cultivars are developed for early maturation, then they can be harvested sooner, but they may compromise grain yield or cooking quality
Solution Approach 1:
The patent uses parameter changes by selectively breeding rice cultivars with altered maturation parameters. The developed cultivars CLM05 and CLM06 achieve early maturation (reducing loss of time) while maintaining or improving grain yield (productivity) through careful genetic selection and combination of parental traits during the breeding process.
3Productivity
If medium-grain rice cultivars are developed for high yield, then grain production increases, but they may lose the cooking quality characteristics preferred in traditional long-grain varieties
Solution Approach 1:
The patent applies parameter changes by modifying grain morphology and cooking quality parameters through breeding. The medium-grain cultivars CLM05 and CLM06 were developed to achieve high grain yield (productivity) while maintaining desirable cooking quality characteristics (reliability) by selecting for specific grain length, width, and starch composition parameters during the breeding program.
4Object-affected harmful factors
If rice cultivars are bred for resistance to AHAS-inhibiting herbicides, then weed control effectiveness improves, but the complexity of the breeding program increases
Solution Approach 1:
The patent applies preliminary action by pre-selecting parental lines with known herbicide resistance traits before initiating the breeding program. This preliminary selection of parents with desired AHAS-inhibiting herbicide resistance simplifies the overall breeding complexity by reducing the number of generations and screening steps needed to achieve the target trait in the final cultivars.
Solution Approach 2:
The patent uses copying by utilizing established herbicide resistance genes from existing parental cultivars (such as Clearfield® rice) and transferring them to new high-yielding backgrounds through controlled crossing. This copying of proven resistance traits reduces breeding complexity compared to developing resistance from scratch.
Data Source
AI summary
A rice cultivar designated CLM05 is disclosed herein. The present invention provides seeds, plants, and plant parts derived from rice cultivar CLM05. Further, it provides methods for producing a rice plant by crossing CLM05 with itself or another rice variety. The invention also encompasses any rice seeds, plants, and plant parts produced by the methods disclosed herein, including those in which additional traits have been transferred into CLM05 through the introduction of a transgene or by breeding CLM05 with another rice cultivar.