Discover and read the best of Twitter Threads about #Auxin
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#PlantScienceClassics #18: Ethylene triple response mutants. 35 years ago Anthony Bleecker et al. exploited the triple response phenotype to identify the #ethylene receptor ETR1. The ethylene story is another example for #PlantBlindness @NobelPrize. doi.org/10.1126/scienc… 
Ethylene is a gaseous #phytohormone with a wide range of roles from plant development to immunity. Ernest Starling in 1905 defined a hormone as mobile chemical messenger synthesized by a multicellular organism, that has physiological activity distant from the site of synthesis.
The effect of ethylene on plants was first noted in the 1900s, when it leaked from illumination gas used in lamps and affected plants nearby. But it was Dimitry Neljubow, who in a series of experiments identified ethlyene as the active substance in the illumination gas in 1905.
#PlantScienceClassics #10: AuxREs, ARFs & Aux/IAAs. In 1997 the trifecta of Tim Ulmasov (TU), Gretchen Hagen (GH) & Tom Guilfoyle (TG) unleashed their @ScienceMagazine/@ThePlantCell double strike on the plant sciences, making auxin the hot topic of the field for the next decade.
Starting with Charles Darwin & son Francis in 1880, several scientists (J. Sachs, F. Went, N. Cholodny...) had speculated that there must be a mobile substance in plants, acting as messenger to direct growth in response to stimuli such as light or gravity (a ‘growth substance’).
In 1931 Fritz Kögl managed to isolate & describe this substance which he named 'auxin' (greek,‘to grow’). As it resembled animal hormones, he also proposed the name ‘phytohormones’ for this new group of plant substances. How this #Auxin promoted growth was not known yet, however.
