Collection period and indolebutyric acid on the rooting of adult pecan plant cuttings

Márcio Alberto Hilgert,Carlos Roberto Martins,Paulo Vitor Dutra De Souza,Larissa Campos De Sá,Marília Lazarotto

doi:10.1590/s1678-3921.pab2020.v55.01656

Abstract

Abstract: The objective of this work was to evaluate the effect of the collection period and of the exogenous application of indolebutyric acid (IBA) on the rooting of cuttings from adult pecan (Carya illinoinensis) plants. The experiment was carried out in a greenhouse with intermittent mist irrigation, from December 2017 to October 2018. The experimental design was completely randomized, in a 4x5 factorial arrangement, with four collection periods (spring, summer, autumn, and winter) and five concentrations of IBA (0, 2,000, 4,000, 6,000, and 8,000 mg L-1). For the cuttings collected during summer and autumn, there was a linear relationship between rooting and the increase of the IBA concentration. The best results for rooting, callus formation, mean number of roots, mean root length, and root dry and fresh mass are obtained for the cuttings collected during summer, with the application of 8,000 mg L-1 IBA on the base of each cutting, under a mist irrigation system. The rooting of cuttings from adult pecan plants with the application of IBA is possible, being an alternative propagation method for the species.

Highlights

Carya illinoinensis (Wangenh.) K.Koch, popularly known as pecan, is a species native to North America that is grown in several countries (Zhang et al, 2015)
Collection period and indolebutyric acid on the rooting of adult pecan plant cuttings Abstract – The objective of this work was to evaluate the effect of the collection period and of the exogenous application of indolebutyric acid (IBA) on the rooting of cuttings from adult pecan (Carya illinoinensis) plants
The best results for rooting, callus formation, mean number of roots, mean root length, and root dry and fresh mass are obtained for the cuttings collected during summer, with the application of 8,000 mg L-1 IBA on the base of each cutting, under a mist irrigation system

Summary

Introduction

Carya illinoinensis (Wangenh.) K.Koch, popularly known as pecan, is a species native to North America that is grown in several countries (Zhang et al, 2015). Pecan seedlings can be produced from seeds, the obtained plants will differ in the orchard due to genetic variability (Vahdati et al, 2020). When propagated by this method, the species presents slow growth and a long juvenility period. For these reasons, the propagation system currently used commercially consists of grafting with seed rootstocks (Fronza et al, 2018). Rootstocks derived from pecan seeds of open-pollinated plants show a great variability, causing differences in grafting, growth, and performance between plants (Cao et al, 2019)

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Results