I would lie to ask your idea for growing Arabidopsis on rockwool. Previously, my Arabidopsis Col-0 can grow well using rockwool. But now, I am facing the problem that Arabidopsis cotyledons change bright green to dark or purple.
Their germination is ok, no problem. After 1-2 weeks past, the young cotyledon start to change the color to be dark, and growth become poor.
I water plant by 3x dilution of Hogland solution. Plant grow at 24C with long day condition (16 hr for light and 8 hr for dark).
For preparing rockwool before use, I wash 3 times by trap water and soak them in trap water for 1-2 hr.
Do you have any suggestion for the solution? or Please suggest me about proper way to grow Arabidopsis on rockwool.