ZmROA1 Protein Regulates Maize Root Angle for Density Tolerance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods lack effective regulation of root angle in maize plants, which affects density tolerance and yield, especially under high-density planting conditions, with limited research on root angle-related proteins for crop improvement.
Innovation Solution
The application of the ZmROA1 protein or substances regulating its content or activity to alter root angle and enhance density tolerance in maize, achieved through genetic modification and overexpression using a maize constitutive promoter like Ubiquitin1, resulting in transgenic maize with reduced root angle and improved density tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If maize planting density is increased to ensure food security, then land use efficiency is improved, but root-to-root competition and light competition increase reducing photosynthesis and yield
Solution Approach 1:
The patent changes the root angle parameter by introducing and overexpressing the ZmROA1 protein, which regulates root growth direction. This parameter change allows roots to grow more vertically (smaller root angle), reducing horizontal root-to-root competition while maintaining deep rooting capability for water and nutrient acquisition, thereby enabling high-density planting without excessive competition
Solution Approach 2:
The patent shifts root growth from primarily horizontal expansion to vertical deepening by modifying root angle. This dimensional change allows the root system to utilize the vertical soil profile more effectively, accessing water and nutrients from deeper layers while reducing lateral competition between neighboring plants, thus supporting increased planting density
2Productivity
If root horizontal expansion range is decreased to increase planting density, then root-to-root competition is reduced, but root length density in the 0-20 cm soil layer increases causing root accumulation
Solution Approach 1:
The patent changes the root growth angle parameter through ZmROA1 protein overexpression, directing roots to grow more vertically. This parameter change reduces the horizontal expansion range of roots, allowing higher planting density while simultaneously decreasing root accumulation in the plow layer (0-20 cm) by channeling root growth deeper into the soil profile
3Reliability
If root growth angle is increased to deepen roots for better water and nitrogen use efficiency, then resource use efficiency is improved, but root angle regulation mechanisms are insufficient for high-density planting
Solution Approach 1:
The patent extracts and identifies the specific regulatory mechanism (ZmROA1 protein) that controls root angle. By isolating this key regulatory factor, the complex root angle regulation mechanism is simplified to a controllable protein expression system, enabling precise manipulation of root growth direction to achieve both deep rooting for resource efficiency and adaptability to high-density planting conditions
Solution Approach 2:
The ZmROA1 protein acts as an intermediary between genetic regulation and root growth phenotype. This intermediary protein mediates the translation of genetic information into specific root angle characteristics, providing a controllable mechanism to regulate root growth direction for achieving deep rooting while adapting to high-density planting requirements
Data Source
AI summary
Applications of a ZmROA1 protein or substance regulating the content or activity of the ZmROA1 protein are provided. The ZmROA1 protein can be specified as follows: A1), A2) or A3): A1, the amino acid sequence is the amino acid sequence shown in SEQ ID NO: 3; A2, the protein, which is obtained by replacing and/or deleting and/or adding the amino acid sequence shown in SEQ ID NO: 3 through amino acid residues, is more than 80% identity to A1) and relates to plant root angle; A3, the fusion protein which is obtained by linking N-end or/and C-end of A1) or A2) to protein tags. ZmROA1 protein and its related biological materials can be used to regulate plant density tolerance and/or root angle, and the cultivation of new density-tolerant maize varieties, which helps improve maize harvest index for high and stable yield.