Fig. 2.

Roots of light-shade seedlings during starvation. (a) A healthy root system at the onset of starvation. (b–d) Root systems at the stem half dead stage (SHD). At this point there appears to be some fine-root death and loss and, in some cases, a small amount of coarse-root death. (e–h) Root systems at the stem all dead stage (SAD). The root condition is variable, but many have a substantial amount of dead major roots and dead or missing fine roots. (i) A cross-section of a white root from (h) was dyed by tetrazolium, thus indicating that this tissue was living.