Articles
EFFECTS OF ROOT ANATOMY IN SAP FLOW RATE OF AVOCADO TREES
Article number
889_44
Pages
363 – 369
Language
English
Abstract
Potted 2-year-old Hass avocado trees (Persea americana Mill.) grafted on two clonal rootstocks: Duke 7 (D7) and Toro Canyon (TC) were studied in terms of sap flow rate and anatomical and morphological characteristics of their root systems.
Sap flow rate was measured with a Dynagage sap flow system based upon the heat balance technique.
Root morphology was assessed by identifying the type of roots (fine roots with only primary growth or thick roots with secondary growth) and the root branching order for each rootstock.
Roots were also examined histologically to determine the relative proportion of stele and cortex.
Significant differences in the sap flow rate were found among the rootstocks, where Hass, on D7, had a 29%-higher sap flow rate than did TC. Besides, anatomical and morphological differences were found between the different kind of roots in the rootstocks: D7 tended to have finer roots, with a greater proportion of stele than cortex in comparison with TC. The results suggest that the differences in water consumption of Hass on different rootstocks may be associated with root anatomy and its function in water transport.
Sap flow rate was measured with a Dynagage sap flow system based upon the heat balance technique.
Root morphology was assessed by identifying the type of roots (fine roots with only primary growth or thick roots with secondary growth) and the root branching order for each rootstock.
Roots were also examined histologically to determine the relative proportion of stele and cortex.
Significant differences in the sap flow rate were found among the rootstocks, where Hass, on D7, had a 29%-higher sap flow rate than did TC. Besides, anatomical and morphological differences were found between the different kind of roots in the rootstocks: D7 tended to have finer roots, with a greater proportion of stele than cortex in comparison with TC. The results suggest that the differences in water consumption of Hass on different rootstocks may be associated with root anatomy and its function in water transport.
Authors
C. Fassio, M. Castro, J. Mamani, R. Heath, M.L. Arpaia
Keywords
anatomy, roots, avocado, clonal rootstock, root histology
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