Rooting of healthy and CVC-affected 'Valência' sweet orange stem cuttings, through the use of plant regulators

Author(s)

Gustavo Habermann ^[1] ; Rita de Cássia Félix Alvarez ^[2] ; Júnior Cesar Modesto ^[3] ; Andréa Maria Teixeira Fortes ^[4] ; João Domingos Rodrigues ^[5] ; Elizabeth Orika Ono ^[6]

Affiliation

^[1] Universidade Estadual Paulista. IB. Departamento de Botânica - Brasil

^[2] Universidade Estadual Paulista. IB. Departamento de Botânica - Brasil

^[3] Universidade Estadual Paulista. IB. Departamento de Botânica - Brasil

^[4] Universidade Estadual Paulista. IB. Departamento de Botânica - Brasil

^[5] Universidade Estadual Paulista. IB. Departamento de Botânica - Brasil

^[6] Universidade Estadual Paulista. IB. Departamento de Botânica - Brasil

• Document type: Journal article
• Source: Brazilian Archives of Biology and Technology; v. 49, n. 1, p. 29-36, 2006-01-00.

Abstract

Citrus variegated chlorosis (CVC) is a disease caused by Xylella fastidiosa. Using different concentrations of plant regulators, such as auxins (indole-3-butyric acid) and gibberellic acid biosynthesis-inhibitor (paclobutrazol), physiological rooting capacity of healthy and CVC-affected stem cuttings were evaluated in order to investigate the importance of plant hormone imbalance and xylem occlusion in plants with CVC. The percentages of dead, alive and rooted cuttings, cuttings with callus and mean number of roots per cuttings did not show statistical differences in response to the distinct concentrations of synthetic plant regulators. There were differences only between healthy and CVC-affected cuttings. This showed the importance of xylem occlusion and diffusive disturbances in diseased plants, in relation to root initiation capacity and hormonal translocation in the plant tissue. (AU)