Articles
CANOPY ARCHITECTURE APPRAISAL BY FRACTAL DIMENSION OF ‘FLORDASTAR’ PEACH TREES GRAFTED ONTO DIFFERENT ROOTSTOCKS
Article number
732_58
Pages
383 – 389
Language
English
Abstract
The objective of this research was to evaluate the modification of canopy architecture of Flordastar peach (Prunus persica L. Batsch) grafted onto rootstocks with different vigour, by the use of fractal dimension (D). The hypothesis was that different vigour rootstocks are able to modify the complexity of the branching pattern and that this effect can be assessed by a geometric parameter such as the fractal dimension (D) of the 2D projection of tree branching structure.
The observations were carried out in a four-year-old experimental orchard of cv. ‘Flordastar’ peach trees grafted onto Ishtara, Barrier, GF677 and MrS 2/5 rootstocks.
On digital pictures of leafless, dormant peach trees, the tree skeleton was manually depicted by an image analysis software to measure total length and angles of insertion of branches.
Bitmaps of the skeleton were then subjected to a specific software (FDCALC) able to calculate D by the box counting method.
To account for the error introduced by analyzing a three dimensional structure with its 2D projection, measurements were done on two images per tree taken from two different viewing angles.
Results are shown in relation to tree vigour of the scion/stock combination.
Fractal dimension was related to the vigour ranking of the graft combinations tested.
In particular, vigorous scion/stock combinations showed the highest D.
The observations were carried out in a four-year-old experimental orchard of cv. ‘Flordastar’ peach trees grafted onto Ishtara, Barrier, GF677 and MrS 2/5 rootstocks.
On digital pictures of leafless, dormant peach trees, the tree skeleton was manually depicted by an image analysis software to measure total length and angles of insertion of branches.
Bitmaps of the skeleton were then subjected to a specific software (FDCALC) able to calculate D by the box counting method.
To account for the error introduced by analyzing a three dimensional structure with its 2D projection, measurements were done on two images per tree taken from two different viewing angles.
Results are shown in relation to tree vigour of the scion/stock combination.
Fractal dimension was related to the vigour ranking of the graft combinations tested.
In particular, vigorous scion/stock combinations showed the highest D.
Publication
Authors
A. Motisi, T. Caruso, I. Grutta, F.P. Marra, F. Pernice
Keywords
tree branching, rootstock vigour, box-counting, digital imaging
Online Articles (104)