Epson salts and high light plants

[rbarata]

rbarata, how long have you had it outside? Is it possible you're just not conditioning it to full sun too rapidly?

I don't think so...it has been in and out, depending on the temps. The major sunburn you see is an old one, not recent.

Plants' use of chlorophyll isn't a defense mechanism. A particular plant need "so much" fuel generation. If the light levels are low, it traps more Mg in the chlorophyll to compensate for the lower energy flux, and if the light is brighter, less, as it doesn't need as much.

Couldn't find a more accurate explanation for it but in my interpretation Mg was to be used by plants to create chlorophyll and to increase its prodution to compensate for its loss due to high light levels.
Do you point me to a good text about it?