Articles
UPTAKE AND TRANSLOCATION OF PACLOBUTRAZOL THROUGH DIFFERENT CANOPY ORGANS AND ROOTS OF AVOCADO (PERSEA AMERICANA MILL.)
Different organs (inflorescences, leaves + petioles, stem and the whole shoot) of uniform shoots consisting of 6–10 inflorescences were applied with 0.75% a.i.
PB at full bloom.
In all treatments there was a significant retardation of the new shoot growth out of the inflorescences tip.
The inflorescences and the whole shoot were the most effective treatments.
The proximity of the treated inflorescences to the shoot top did not influence significantly the shoot growth from its tip.
Uniform shoots of mature Fuerte trees consisting of 6 leaves were treated with 0.01% a.i.
PB labeled with 2.5 μCi / ml 14C-PB. The following organs were treated: the uppermost leaf, the 6th leaf, 5 cm of the stem at the shoot bottom and the inflorescences.
Radioactive detection by X-ray film radiograms showed acropetalic translocation of PB or its labeled residues mainly to the terminal site of growth.
A minor basipetal translocation was also observed.
Labeled PB was applied to pot soil of seedlings.
PB was concentrated mainly at the sprouting points of the terminal inflorescences and in its new vegetative growth.
It can be concluded that PB can be taken up by almost each part of the avocado canopy and roots.
The uptake through the inflorescences was the most effective.
PB translocates mainly to vegetative sinks, where it inserts the growth retardation.