stains for lignous live plants

[=?utf-7?Q?Julio_+AME-lvarez?=]

Hello:

Is there anyone, who could give me any information about living stains that
can be used to mark living xylem in a plant growing in the field?. I am
trying to measure radial annual growth in lignous plants.

Thank you very much.


Julio +AME-lvarez                bvjaj+AEA-bioveg.alcala.es