20 September 2017 2 4K Report

I am currently inducing drought-like conditions with PEG-8000 and began to notice inconsistencies with an old batch of PEG. I work in a relatively hot area and the PEG is kept in a storage bay near out greenhouse which is not temperature controlled. Though the PEG is only 5 months old, it has likely been subjected to a range of temperatures from 30 to 45 degrees Celsius, over our summer. Temperatures could have likely exceeded this, as we do not have a gauge in the bay to measure temp, and the area is essentially a metal shed. Additionally, the PEG is stored in zip-tied bags within another sealed case, and therefore shouldn't be exposed to external elements that could cause contamination. Is it possible that the consistently high temperatures affected the composition of the PEG and led to the variability in phenotypes witnessed? Additionally, are there ways to assay the quality of PEG between the older batch and the newer one, without the use of NMR machinery?

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