LI-6800
Portable Photosynthesis System
A New Experience in Gas Exchange and Fluorescence Research
LI-6800 Portable Photosynthesis System
True to its heritage, the LI-6800 Portable Photosynthesis System is a technological innovation that can reveal the mechanisms of photosynthesis, creating research opportunities for plant biologists around the world.
The ultimate experience
An intuitive interface-easy to learn and simple to configure-helps you collect the best data possible. It shows you what the instrument is doing and notifies you of any issues with the configuration.
The best performance
With improvements in every respect-gas analyzers, flow control, valve system, light sources, and the way these parts work together-the LI-6800 performs like a world-class orchestra.
Unparalleled sealing
Maximized control
Real-time guidance
For more reproducible data
Large leaf area: With a large leaf chamber aperture, the LI-6800 minimizes edge effects and optimizes signal-to-noise ratios. The standard leaf chamber aperture has an area of 9-cm2. The fluorometer has a 6-cm2 aperture. For small leaves, you can easily calculate the leaf using the built-in leaf area calculator.
Rapid temperature control: Capable of achieving 10 °C below and above ambient temperature, the LI-6800 provides fast and precise leaf temperature control. It can control temperature at a setpoint, track the ambient temperature, or ramp the temperature according to your experimental requirements.
Fast control loops: When you change the leaf chamber environment-light, temperature, CO2, or H2O- the instrument adjusts to the new setpoint right away. The fast adjustment saves time and enables you to measure a plant’s response to rapidly changing conditions.
H2O control: With automated control over humidity in the air stream, you can add or remove H2O independently of flow rate. The instrument automatically keeps humidity below condensing conditions.
Graphical touchscreen display: The full color display helps you visualize the instrument settings, making it easy to understand how the instrument is configured. Advanced graphing capabilities enable you to see data as measurements progress.
Higher system flow rates: User-adjustable flow rates- from 0 to 2.5 liters per minute- minimize response times and expand the system versatility.
Attention to the Details
A unique, durable fine-wire thermocouple maintains direct contact with the leaf- to get the actual leaf temperature with every measurement.
Light source provides independent control of red and blue light intensities over the 3×3 cm Clear Top Chamber.
User-settable control loop adjustment rates to adjust chamber conditions such as CO2 concentration or light over time with linear, sine, or step adjustments.
Fast survey measurements- as fast as 45 seconds in some conditions- so you can get more done in a day.
Subsample ports to sample the gas stream before and after the leaf chamber.
Large chambers improve accuracy of low-flux measurements.
Supports low CO2 concentrations and 1-ppm step changes to find the CO2 compensation point in C4 plants without customization.
Automatic diagnostics alert you to configuration issues and ensure the system is performing at its best.
Intuitive interface simplifies learning.
Self-adjusting chamber tensioner always closes with the best pressure.
Gas input port enables you to subject the leaf to custom gas blends.
Automatically controlled chamber overpressure to counteract diffusion leaks.
Measurements & Applications
Designed for cutting-edge research, yet easy to learn, the LI-6800 is both a remarkable teaching tool and a powerful research instrument that provides the ability to answer new questions.
Simultaneous Gas Exchange and Fluorescence
The optional 6800-01 Multiphase Flash™ Fluorometer is a Pulse Amplitude Modulated (PAM) fluorometer that provides simultaneous fluorescence and gas exchange measurements over the same 6-cm2 leaf area. It provides both modulated and non-modulated fluorescence signals. The fluorometer can perform induction kinetics over the entire aperture, as well as measure dark- and light-adapted leaf parameters including Fo, Fm, F, Fm’, Fo’. Calculated parameters include Fv, Fv/Fm, Fv’/Fm’, ØPSII, qP, qN, NPQ, and ETR.
The fluorometer supports the Multiphase Flash™ Fluorescence (MPF) protocol to accurately estimate Fm’ at infinite irradiance. This protocol is a novel approach to determine maximum fluorescence yield (Fm’) with a single measure-ment of less than 1 second (Loriaux et al., 2013).
