Abstract:
Allelopathy is the direct
influence of chemical released from one
plant on the development and growth of
another plant. The trial accomplished in
seed technology laboratory of Faculty of
Agriculture, Islamic Azad University of
Isfahan, in 2018. A factorial layout within
completely randomized design with four
replications was used. Treatments
included plant organs extract (leaf, stem,
root and total plant), and different tobacco
extract densities includes four levels of
0%, 25%, 50% and 100%. Control
treatment (0% of tobacco extract) had
obtained the highest value of germination
rate, germination percentage, coleoptile
weight, radicle weight, radicle length and
coleoptile length. The maximum
germination rate, germination percentage,
coleoptiles weight, radicle weight, radicle
length and coleoptiles length was related
to extract of stem extract which had
meaningful differences with other
treatments. Both radicle and coleoptile
length decreased with increase in
concentration of tobacco extract. Tobacco
extract has negatively effects on corn
seeds by decreasing the germination rate.
Tobacco may increase the presence of
secondary metabolites, such as alkaloids,
all of which may have different effects on
seed germination percentage. The highest
germination percentage (91.91%),
coleoptile weight (0.046 mg), radicle
weight (0.0161 mg), radicle length (7.24
mm), and coleoptiles length (6.45 mm)
was related to interaction between control
treatment (0% of extract) and stem
extract. It is concluded that the extract of
Nicotiana tabacum had both inhibitory
and stimulatory effects on seedling
growth of Zea mays.
