Florigenic FT Protein Promoter Control Plant Architecture
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Solution Overview
Problem
Current methods for enhancing crop yields, particularly in flowering plants, are limited in effectively manipulating flowering time and reproductive development to increase seed production, as they often result in severe phenotypes or early termination of plants.
Innovation Solution
A recombinant DNA construct encoding a florigenic FT protein linked to a vegetative stage promoter is introduced into plants, allowing for controlled expression during the vegetative stage to induce earlier flowering and increase reproductive traits such as the number of flowers and seeds per node, without the severe termination phenotypes associated with constitutive FT expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If constitutive FT expression is used to induce flowering, then flowering is triggered, but severe dwarfing and early termination phenotypes occur
Solution Approach 1:
The patent applies dynamics by making the FT expression conditional rather than constitutive. The FT gene is placed under the control of a promoter that responds to specific environmental cues (such as photoperiod or temperature), allowing the expression level to dynamically adjust based on environmental conditions. This enables flowering induction while avoiding the severe dwarfing and early termination phenotypes associated with constant high-level expression, as the plant can modulate FT levels to match optimal developmental stages.
2Productivity
If FT expression is enhanced to increase reproductive traits, then the number of flowers and seeds per node increases, but plant architecture becomes severely distorted
Solution Approach 1:
The patent applies local quality by spatially restricting FT expression to specific tissues or organs where it is most beneficial for increasing reproductive output. Rather than uniform expression throughout the plant, the FT gene is targeted to express in specific locations such as floral meristems or developing inflorescences. This localized expression enhances the number of flowers and seeds per node while minimizing disruption to overall plant architecture, as other tissues maintain their normal developmental programs.
3Duration of action of moving object
If flowering is induced earlier to extend reproductive duration, then yield potential increases, but vegetative growth is compromised
Solution Approach 1:
The patent applies periodic action by utilizing environmental周期 (cycles) such as photoperiod or temperature fluctuations to regulate FT expression timing. The promoter responds to periodic environmental cues, causing FT to be expressed at specific times within each cycle rather than continuously. This periodic expression pattern allows the plant to accumulate sufficient vegetative biomass during favorable conditions while still inducing flowering and extending reproductive duration in response to seasonal signals, thereby balancing both vegetative growth and reproductive output.
Data Source
AI summary
The present invention provides recombinant DNA constructs, vectors and molecules comprising a polynucleotide sequence encoding a florigenic FT protein operably linked to a vegetative stage promoter, which may also be a meristem-preferred or meristem-specific promoter. Transgenic plants, plant cells and tissues, and plant parts are further provided comprising a polynucleotide sequence encoding a florigenic FT protein. Transgenic plants comprising a florigenic FT transgene may produce more bolls, siliques, fruits, nuts, or pods per node on the transgenic plant, particularly on the main stem of the plant, relative to a control or wild type plant. Methods are further provided for introducing a florigenic FT transgene into a plant, and planting transgenic FT plants in the field including at higher densities. Transgenic plants of the present invention may thus provide greater yield potential than wild type plants and may be planted at a higher density due to their altered plant architecture.