EPF Manipulation for Monocot Stomatal Density Control
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Solution Overview
Problem
Current methods for improving drought tolerance and water use efficiency in crops are limited, especially in monocot plants, and existing solutions often come with yield penalties or are not economically viable on a large scale, while the molecular understanding of stomatal development in monocots is poorly understood.
Innovation Solution
Manipulation of Epidermal Patterning Factor (EPF) expression in monocot plants to reduce stomatal density, achieved through overexpression or suppression of EPF polypeptides, leading to improved water use efficiency and drought tolerance without yield reduction, and enhanced resistance to microbial pathogens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stomatal density is reduced through genetic manipulation to improve water use efficiency, then drought tolerance is improved, but yield may be compromised due to reduced gas exchange capacity
Solution Approach 1:
The patent applies local quality by differentially regulating stomatal density in specific leaf regions rather than uniformly across the entire plant. By expressing EPF peptides in a spatially controlled manner, the invention creates zones of reduced stomatal density in areas where water conservation is prioritized, while maintaining normal stomatal development in regions where photosynthetic capacity is critical, thus resolving the contradiction between drought tolerance and yield
Solution Approach 2:
The invention employs dynamic regulation of stomatal density through inducible or condition-dependent expression of EPF peptides. The stomatal patterning can be dynamically adjusted in response to environmental conditions such as water availability, allowing the plant to optimize the balance between water conservation and carbon assimilation based on real-time conditions, thereby maintaining yield while improving drought tolerance
2Loss of energy
If chemical anti-transpirants are used to reduce water loss through stomata, then water status and fruit size improve, but economic viability is compromised due to high cost
Solution Approach 1:
The patent implements self-service by engineering plants to autonomously regulate their own stomatal density through endogenous EPF peptide expression. The genetically modified plants self-control water loss through modified stomatal patterning without requiring external application of chemical anti-transpirants, eliminating the ongoing costs associated with chemical treatments while maintaining water conservation benefits
Solution Approach 2:
The invention applies preliminary action by pre-establishing modified stomatal patterning through genetic transformation before the plants are deployed in the field. The EPF peptide expression is constitutively or conditionally activated to create the desired stomatal density pattern in advance, eliminating the need for repeated chemical applications and reducing long-term costs while maintaining water use efficiency
3Loss of energy
If stomatal density is reduced to improve water use efficiency, then transpiration loss decreases, but resistance to pathogen infection may be compromised due to altered epidermal structure
Solution Approach 1:
The patent applies local quality by creating heterogeneous stomatal patterns where regions of reduced stomatal density coexist with regions of normal or enhanced stomatal density. This spatial variation in stomatal distribution allows the plant to optimize water conservation in certain areas while maintaining adequate physical barriers and gas exchange capacity in other areas, thereby preserving resistance to pathogen infection that may exploit uniformly reduced stomatal density
Solution Approach 2:
The invention employs parameter changes by modulating not only stomatal density but also stomatal size, distribution patterns, and developmental timing through controlled EPF expression. These multiple parameter adjustments create a complex epidermal architecture that can simultaneously reduce transpiration loss while maintaining or even enhancing resistance to pathogen entry, as pathogens face a more varied and potentially more resistant epidermal landscape
Data Source
AI summary
The present invention relates to the modification of gene expression in plants in order to manipulate stomatal number, in particular to the modification of expression in plants of epidermal patterning factor (EPF). The invention also relates to genetically modified plants or plant parts with altered stomatal patterning compared to corresponding wild type plants or plant parts, where the plant stomatal development is altered by modification of the expression of EPF.