In summary, the plant material from A. dealbata caused changes
and structural damage in L. sativa and Q. saponaria radicles. The
three plant parts inhibited the root hairs formation and altered
rhizodermis; however, leaves induced alterations in vascular cylinder
of Q. saponaria, while the root cap was dismantled by action of
pods and leaves. The effects on thickening, cell organization and the
absence of root hairs suggest that A. dealbata litter act as releaser of
powerful phytotoxic compounds. These morphological changes or
damage are potential risks for the growth and survival of the recipient
species due to limitations to absorb water and nutrients, as well
as the photosynthetic effects associated. This study contributes to
understanding the modes of action of allelochemicals released by
A. dealbata in Mediterranean ecosystems of South America, which
might be similar in other Mediterranean ecosystems.