Dear all,
please find the presentation of the resent results attached to this mail.
Nine different spectral conditions, including the fluorescent tube control, were tested and treated (fertilized).
Details of the experiment design are listed in the presentation.
High-resolution pictures/presentation is available for download here (to allow to zoom in):
A short summary:
Irrespective of the spectral conditions, most of the untreated plants show, to a certain extent, stress symptoms and Anthocyanin accumulation.
This applies also to the fluorescent tube control spectrum (!). In this particular experiment the fluorescent tube control shows even the strongest stress symptoms.
On the other hand, ALL treated (fertilized) samples look very healthy and do not show any stress symptoms.
This quick test and the literature listed seems to proof our hypothesis: “Photooxidative stress caused by nutrient (Pi?) deficiency”.
We will continue with the investigation focusing on the soil and nutrients.
A new type of soil should arrive soon for testing (details see presentation).
Please contact me in case of any questions, comments or complains.
Best wishes, yours PlantS Team!
Dear friends,
In the last weeks/months we have been investigating the plant stress issue, mainly focusing on the LED light spectrum.
Always comparing to the fluorescent tube standard.
Surprisingly, also the fluorescent tube setup shows same plant stress issues!
Which was not the case in the very beginning when we have tested and decided for the new type of soil.
See picture attached to this mail:
Phytotron: #21
Soil: Gramoflor2006; not sieved; with perlite
Light: Fluorescent tubes; LD
Watering: Flooding twice a week
Left side of the tray: WUXAL treated plants (once, after 1 month, 2ml/L)
Right side of the tray: untreated plants
Our new hypothesis focuses on the soil.
In particular, on the soil composition and the available nutrients.
From today’s point of view, it looks like the composition of the soil might have changed over the last months (without informing us); but this needs further investigation.
The automated watering system (flooding) also eventually contributes negatively to the problem by washing out nutrients; twice a week.
Also sieving might be suboptimal.
Red leaves are known to be a symptom for Phosphor/Phosphate deficiency.
We are in touch with the soil supplier and with APPN soil scientist from the BOKU to find a long-term solution.
As a quick fix
- you can fertilize your plants with WUXAL fertilizer which is available in the Facility (once after ~1month; 2ml/L; watering from the top).
- Use a long-term fertilizer (OSMOCOTE)
- Use the old type of soil ED63
Please contact Anneliese in case of questions for the quick fix.
We will keep you posted on further steps and present you soon our final results and the long-term solution.
Looking forward to your valuable feedback on your quick-fix results.
Best wishes, yours PlantS Team
<image001.png> | | Vienna BioCenter Core Facilities GmbH
Dr. Bohr-Gasse 3
1030 Vienna
Austria
www.vbcf.ac.at |
Chair, Austrian Plant Phenotyping Network (APPN) and Support Group Member of ESFRI EMPHASIS project
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FFG PHENOPlant: Austrias 1st multi-sensor, high-throughput plant phenotyping infrastructure launching 2021!