TMAO Application for Plant Drought Tolerance Without Fitness Costs
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Solution Overview
Problem
Current methods for enhancing drought tolerance in plants are not satisfactory, as existing phytohormones and osmolytes like betaine do not consistently provide effective protection against drought stress and may incur fitness costs, and alternative strategies are needed to improve water use efficiency and yield under drought conditions.
Innovation Solution
Applying Trimethylamine N-oxide (TMAO) or its derivatives, such as Trimethylamine N-oxide di-hydrate or N,N-Dimethyldecylamine N-oxide, to plants or seeds to induce drought tolerance, allowing for increased biomass, fruit, or seed production under water-stressed conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If betaine or other osmolytes are applied to enhance drought tolerance, then protective effect against drought stress is improved, but fitness cost increases and stress tolerance becomes variable among species
Solution Approach 1:
The patent changes the chemical parameter from traditional osmolytes (betaine, glycinebetaine) to TMAO (trimethylamine N-oxide). This parameter change resolves the contradiction because TMAO provides consistent drought protection across multiple plant species without the fitness costs associated with betaine, as demonstrated in Examples 1-3 where TMAO-treated plants showed improved survival and growth under drought stress without negative side effects
Solution Approach 2:
The patent employs an external application approach where TMAO is applied as a treatable composition to seeds or plants rather than requiring genetic engineering for constitutive production. This disposable approach resolves the contradiction by providing reliable drought protection through external application that works across species without the metabolic burden and fitness costs of endogenous osmolyte production
2Reliability
If constitutive expression of bacterial choline oxidase gene is used to produce betaine, then osmoprotection is conferred, but fitness cost is observed and stress responses are variable
Solution Approach 1:
The patent uses TMAO as an intermediary substance applied externally rather than requiring genetic modification for endogenous production. This resolves the contradiction by providing osmoprotection through a mediatory compound that accumulates in plant tissues upon application, eliminating the need for constitutive gene expression and associated fitness costs while maintaining reliable stress protection
Solution Approach 2:
The patent employs external application of TMAO as a disposable protective agent rather than permanent genetic modification. This resolves the contradiction by providing osmoprotection through temporary but effective external application that avoids the metabolic burden and productivity losses associated with constitutive expression of foreign genes
3Stability of the object's composition
If high levels of osmolytes are accumulated to enhance protection, then cell volume maintenance is improved, but protein overstabilization occurs and protective properties become harmful
Solution Approach 1:
The patent changes the chemical identity parameter from traditional osmolytes to TMAO, which provides cell volume maintenance and drought protection without causing protein overstabilization. The Examples demonstrate that TMAO-treated plants achieve adequate protection levels without the harmful side effects of excessive protein stabilization that occur with high levels of conventional osmolytes
Data Source
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AI summary
A method for increasing drought tolerance in a plant or photosynthetic organism is provided, where the tolerance is increased by applying an effective amount of Trimethylamine N-oxide (TMAO), Trimethylamine N-oxide di-hydrate, a TMAO chemical derivative or a TMAO chemical analogue to a plant, plant part, photosynthetic organism or seed, or by introducing nucleic acid sequences coding for polypeptides with flavin monooxigenase activity, so the activity is increased three, preferably eight or more times or by the modification of endogenous nucleic acid sequences that increase the endogenous TMAO content in plants three, preferably eight or more times. Additionally, the invention relates to drought tolerant plants or photosynthetic organisms or its parts produced by the methods of the invention.