Effects of root anatomy in sap flow rate of avocado trees

C. Fassio, M. Castro, J. Mamani, R. Heath, M. L. Arpaia

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Scopus citations

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.

Original languageEnglish
Title of host publicationVI International Symposium on Irrigation of Horticultural Crops
PublisherInternational Society for Horticultural Science
Pages363-370
Number of pages8
ISBN (Print)9789066057135
DOIs
StatePublished - 4 Mar 2011
Externally publishedYes

Publication series

NameActa Horticulturae
Volume889
ISSN (Print)0567-7572

Keywords

  • Anatomy
  • Avocado
  • Clonal rootstock
  • Root histology
  • Roots

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