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3 protocols using trimethylsilyldiazomethane solution

1

Quantifying Auxin Levels in Arabidopsis

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Endogenous free IBA and IAA were quantified from shoot and root segments of 9-days-after-germination (dag) light-grown (16 h) Arabidopsis seedlings by using gas chromatography-mass spectrometry (GC–MS) as described in Leljak-Levanic et al. (2010) (link). Methylation was performed by adding equal sample amounts of a 1:10 diluted solution (in diethylether) of trimethylsilyldiazomethane solution (Sigma-Aldrich) for 30 min at room temperature. The mixture was then evaporated and resuspended in 50 μl of ethyl acetate for GC–MS analysis. Data are means of four independent lots of 30–50 seedlings each, and equivalent to ca. 100 mg root shoot material, respectively.
Homozygous generations of Arabidopsis abcg36-4 and abcg36-4 abcg37-2 expressing DR5:GFP were obtained by crossing with DR5:GFP lines (Ottenschlager et al., 2003 (link)). Seedlings were grown vertically for 5 (dag) and then for 4 h on 5 (M IBA plates and analyzed by confocal laser-scanning microscopy. DR5:GFP signals in the very root tip were analyzsed using the Fiji software3.
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2

Synthesis of Methacrylic Acid Diblock Copolymers

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Methacrylic
acid (MAA), 2-hydroxybutyl methacrylate
(HBMA; actually a 1:1 molar ratio of 2- and 4-isomers as judged by 1H NMR spectroscopy15 (link)), and 4,4′-azobis(4-cyanovaleric
acid) (ACVA) were purchased from Sigma-Aldrich U.K. and used as received
unless otherwise specified. Deionized water was used in all experiments.
4-cyano-4-(2-phenylethanesulfanylthiocarbonyl)sulfanylpentanoic acid
(PETTC) was prepared as described previously.39 (link) The trimethylsilyldiazomethane solution (2.0 M in diethyl
ether), THF (HPLC, ≥99.9%), and glacial acetic acid (≥99.85%)
used for the preparation and analysis of the methylated diblock copolymers
were also purchased from Sigma-Aldrich U.K. Methanol-d4, dimethyl sulfoxide-d6,
and dimethylformamide-d7 used for 1H NMR spectroscopy were purchased from Goss Scientific Instruments
Ltd. (Cheshire, U.K.). All other solvents were purchased from Sigma-Aldrich
U.K. or VWR Chemicals.
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3

Synthesis of Methacrylate Polymer Precursors

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Methyl
methacrylate (MMA, 99%), ethyl methacrylate
(EMA, 99%), n-butyl methacrylate (BMA, 99%), n-hexyl methacrylate (HMA, 99%), DMAEMA (99%), and MAA (99.5%)
were purchased from Sigma-Aldrich (Gillingham, U.K.) and were passed
through a basic alumina column to remove inhibitor prior to polymerization.
2-Ethylhexyl methacrylate (EHMA, 98%) was purchased from Alfa Aesar
(Heysham, U.K.), and its inhibitor was removed using an alumina column.
Isopropanol (IPA, 99.9%), triethanolamine (TEA, 99%), 4,4′-azobis(4-cyanovaleric
acid) (ACVA), 1,4-dioxane (99.5%), trimethylsilyldiazomethane solution
(2.0 M in diethyl ether), benzyl bromide (BzBr, 98%), and deuterated
acetone were purchased from Sigma-Aldrich. Deuterated chloroform (CDCl3) and deuterated dimethyl sulfoxide (DMSO-d6) for NMR spectroscopy measurements were purchased from
VWR (Lutterworth, U.K.). Deionized water was obtained using an Elgastat
Option 3A water purifier (Elga, High Wycombe, U.K.). 4-Cyano-4-(2-phenylethanesulfanylthiocarbonyl)sulfanylpentanoic
acid (PETTC) used for RAFT polymerization was prepared and purified
in-house, as reported previously.35 (link) Unless
stated otherwise, all materials were used as received.
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