Dro1 Gene Deep Rooting Rice Drought Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for assessing and conferring deep rooting in plants are inefficient, particularly for rice cultivars like IR64, where deep rooting is crucial for drought resistance but difficult to achieve through existing genetic transformation methods, and there is a lack of identified genes specifically related to deep rooting.
Innovation Solution
Identification and isolation of the Dro1 gene, which is associated with deep rooting in rice, using high-resolution linkage analysis and nucleotide sequence comparison, and its introduction into IR64 to enhance drought resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional genetic transformation methods are used to introduce deep rooting genes, then transformation efficiency is low, but the process is time-consuming and labor-intensive
Solution Approach 1:
The patent replaces conventional mechanical Agrobacterium-mediated transformation with a particle bombardment system (gene gun). This substitution uses physical kinetic energy to deliver DNA-coated particles directly into plant cells, eliminating the biological complexity and time-consuming nature of Agrobacterium culture and infection processes. The result is significantly improved transformation efficiency and reduced processing time.
2Reliability
If deep rooting is achieved through traditional breeding methods, then drought resistance is improved, but the breeding process requires extensive field screening and is inefficient
Solution Approach 1:
The patent replaces traditional phenotypic field screening with molecular marker-assisted selection. Instead of manually evaluating root depth and drought resistance in the field, the invention uses DNA markers linked to deep rooting QTLs to identify plants with the desired trait at the molecular level. This substitution dramatically increases breeding efficiency while maintaining reliable selection for drought resistance.
Solution Approach 2:
The patent introduces molecular markers as intermediaries between the deep rooting trait and the selection process. These markers serve as proxies that indicate the presence of favorable alleles at deep rooting QTLs, allowing breeders to select for deep rooting without direct phenotypic evaluation. This intermediary system resolves the contradiction by enabling efficient selection while ensuring reliable trait inheritance.
3Ease of operation
If root growth direction is altered to achieve deep rooting, then water absorption from deeper layers is improved, but existing genes controlling root tropism are insufficient
Solution Approach 1:
The patent segments the complex trait of deep rooting into distinct genetic components by identifying specific QTLs (qtrd1.1, qtrd1.2, qtrd1.3) that control different aspects of root architecture. Each QTL represents a discrete genetic segment that can be independently manipulated and tracked. This segmentation simplifies the genetic control system by breaking down the complex polygenic trait into manageable units that can be targeted for improvement.
Solution Approach 2:
The patent identifies deep rooting QTLs that have multiple functions: they control not only root depth but also root angle, lateral root formation, and overall root system architecture. By targeting these universal QTLs, a single genetic intervention can simultaneously improve multiple root traits, thereby enhancing water absorption capability without requiring complex multi-gene modifications.
Data Source
Figure 1A~1E
Figure 2
Figure 3
AI summary
To provide a gene that controls the deep rooting of a plant, a transgenic plant introduced with the gene, a method for controlling the deep rooting of a plant using the gene, and such, high-resolution linkage analysis was performed for a genetic locus (Drol locus) capable of controlling the deep rooting of a plant, which was detected between a shallow-rooted rice cultivar IR64 and a deep-rooted rice cultivar Kinandang Patong in a large-scale segregating population. As a result, it was revealed that the gene region of Dro1 is located in a region of 6.0 kbp sandwiched between Dro1-INDEL09, which is an InDel marker, and Dro1-CAPS05, which is a CAPS marker. Furthermore, it was confirmed that a transgenic plant transformed with the Kinandang Patong-type Dro1 gene shows a significantly high ratio of deep rooting. It was also confirmed that a plant having the Kinandang Patong-type Dro1 gene is resistant to drought.