Resumen

RAMIREZ, Homero et al. Influence of P-Ca on cytokinins in xylem sap and on stomatal resistance in apple. Ecosistemas y recur. agropecuarios [online]. 2021, vol.8, n.1, e2580.  Epub 07-Nov-2022. ISSN 2007-901X.  https://doi.org/10.19136/era.a8n1.2580.

With the purpose to search upon the cytokinins origin, a study was conducted on the effects of prohexadione-ca (P-Ca) on cytokinins in xylem sap and on stomatal resistance in apple. Golden Delicious seedlings were sprayed with 100 ppm P-Ca. Stomatal leaf resistance was measured at intervals between 1 and 4 hours of spraying and 15 days after the treatment. Golden Delicious trees were sprayed with 200 ppm P-Ca two weeks after full bloom. At intervals between 1 and two weeks after P-Ca treatment, the main de-shooted stem was removed from root system and xylem sap was collected for cytokinins analysis using the suction technique. Prohexadione- ca significantly increased stomatal resistance (range 2.74-4.35 s/cm−1) when compared to control (range 2.12-3.44 s/cm−1); however, P-Ca did not modify the level of cytokinins in xylem sap since range values were between 0.10 to 0.20 µg kinetin equivalents/20 ml xylem sap for both, cytokinin and control.

Palabras llave : Deciduous fruit; growth retardant; hormone translocation; leaf approach.

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