Product Overview and Composition

Gibberellin GA4+7 Storage Solution (SKU: G1539721) is a sterile, pre-formulated stock solution containing a mixture of Gibberellin A4 (GA4) and Gibberellin A7 (GA7) at a combined concentration of 1 mg/mL. The solvent system consists of ethanol and water, which ensures complete dissolution of these sparingly water-soluble diterpene acid phytohormones while maintaining chemical stability.

GA4 and GA7 are naturally occurring gibberellins that play critical roles in seed germination, stem elongation, flowering induction, and fruit development. The GA4+7 mixture is widely used in research because it closely mimics the endogenous gibberellin profile found in many plant species, and is also employed in commercial horticulture applications. The sterile format minimizes the risk of microbial contamination when used in plant tissue culture or sensitive bioassays.

Recommended Storage and Stability

To maintain the potency and integrity of Gibberellin GA4+7 Storage Solution, adhere to the following storage guidelines:

• Temperature: Store at −20 °C for long-term storage. Short-term working aliquots may be kept at 4 °C, protected from light, for up to 2–4 weeks.
• Light sensitivity: Gibberellins are sensitive to UV and visible light. Always store in amber vials or wrapped in foil. Avoid prolonged exposure during handling.
• Freeze-thaw cycles: Minimize repeated freeze-thaw cycles by preparing single-use aliquots upon receipt. Repeated cycling can degrade active gibberellin content.
• Container integrity: Keep the vial tightly sealed when not in use to prevent solvent evaporation and concentration changes.

Note: Specific expiry dates and confirmed long-term stability data should be verified on the product Certificate of Analysis (CoA). Flag for review if no CoA data is available.

Dilution and Working Solution Preparation

The 1 mg/mL stock solution is intended for dilution to appropriate working concentrations before use. Follow the steps below to prepare working solutions correctly:

1. Determine target concentration: Typical working concentrations for plant bioassays and tissue culture range from 0.01 µg/mL to 10 µg/mL (10 ng/mL to 10 µg/mL), depending on the species and experimental goal. Consult relevant literature for your specific application.
2. Dilution medium: Dilute into sterile distilled water, half-strength Murashige and Skoog (MS) medium, or another aqueous buffer suited to your assay. Because the stock contains ethanol, ensure the final ethanol concentration in the working solution remains below 0.1% (v/v) to avoid phytotoxicity.
3. Serial dilution: Prepare intermediate dilutions in a sterile biosafety cabinet to maintain the sterile status of the solution.
4. Filter sterilization: If additional dilution steps are performed outside sterile conditions, pass the final working solution through a 0.22 µm syringe filter before use.
5. Immediate use: Freshly prepared working solutions should be used promptly; avoid storing diluted solutions for extended periods as gibberellins can hydrolyze under aqueous conditions.

Applications in Plant Biology Research

Gibberellin GA4+7 is employed across a broad range of plant science research contexts:

• Seed germination studies: GA4+7 promotes germination in light-requiring and dormant seeds by overcoming dormancy mechanisms. It is commonly used to standardize germination assays.
• Stem elongation and dwarf mutant rescue: GA-deficient or GA-insensitive mutants (e.g., gai, rga in Arabidopsis thaliana) are treated with exogenous GA4+7 to confirm gibberellin signaling pathway function.
• Flowering induction: GA4+7 can substitute for vernalization or long-day conditions in certain species, making it a tool for studying photoperiod-independent flowering pathways.
• Fruit set and parthenocarpy: Applied to flowers, GA4+7 promotes fruit development in the absence of pollination, used in studies of fruit biology and as a positive control in bioassays.
• Plant tissue culture: Added to regeneration or elongation media to promote shoot growth from callus or explants.

Always include solvent-only vehicle controls (equivalent ethanol/water concentration) alongside GA4+7-treated samples to account for any solvent effects on the biological system.

Safety, Handling, and Disposal

Although Gibberellin GA4+7 Storage Solution is used at low concentrations in research, standard laboratory safety practices must be followed:

• Personal protective equipment (PPE): Wear appropriate laboratory coat, nitrile gloves, and safety glasses when handling the solution. The ethanol co-solvent is flammable; keep away from open flames and ignition sources.
• Skin and eye contact: In case of skin contact, wash thoroughly with soap and water. For eye contact, flush immediately with copious water and seek medical attention if irritation persists.
• Inhalation: Work in a well-ventilated area or under a fume hood to minimize inhalation of ethanol vapors.
• Waste disposal: Dispose of unused solution and contaminated materials in accordance with your institution's chemical waste disposal guidelines and applicable local regulations. Do not pour down the drain without authorization.
• SDS: Always consult the Safety Data Sheet (SDS) for G1539721 before first use. Contact Aladdin Scientific for the current SDS if not included with shipment.