&lt;b&gt;Successive mini-cuttings collection in &lt;i&gt;Piptocarpha angustifolia&lt;/i&gt; mini-stumps: effects on maturation, adventitious root induction and root vigor

Carlos André Stuepp,Katia Christina Zuffellato-Ribas,Henrique Soares Koehler,Ivar Wendling

doi:10.4025/actasciagron.v39i2.31059

<b>Successive mini-cuttings collection in <i>Piptocarpha angustifolia</i> mini-stumps: effects on maturation, adventitious root induction and root vigor

Carlos André Stuepp, Katia Christina Zuffellato-Ribas + Show 2 more

Open Access

https://doi.org/10.4025/actasciagron.v39i2.31059

Copy DOI

Abstract

The low percentage of seed germination and adventitious root induction in cuttings of Piptocarpha angustifolia has limited its silvicultural use. Thus, we studied the effect of tissue maturation on successive collections of mini-cuttings grown in a semi-hydroponic system. Likewise, we evaluated potential multiplication via the mini-cutting technique by assessing the survival and productivity of mini-stumps as well as the formation of adventitious roots and the root vigor. We made 32 sprout collections during two years in a clonal mini-garden. From these collections, mini-cutting experiments were installed throughout several seasons. Mini-cuttings of 8±1 cm long were prepared, planted in boxes with vermiculite and carbonized rice husk (1:1 v/v) and placed in a greenhouse. After 70 days, we evaluated the adventitious rooting percentage as well as the adventitious root and aerial vigor of the mini-cuttings. The appropriate survival of mini-stumps (68%) and the annual production of mini-cuttings per square meter (2,227) reflected the efficiency of the semi-hydroponic system for this species. The increasing rooting, multiplication rate and root vigor indicate no maturity in the course of the collection of mini-cuttings in P. angustifolia mini-stumps .

Highlights

Piptocarpha angustifolia Dusén ex Malme, popularly known as “vassourão branco”, naturally grows in the Araucaria Forest as a pioneer species (Carvalho, 2003; Fossati & Nogueira, 2009)
Cuttings of P. angustifolia were obtained by traditional cutting techniques following the plant rescue methodology through epicormic shoots (Stuepp, Zuffellato-Ribas, Wendling, Koehler, & Bona, 2014)
The mini-cutting productivity was similar to that reported in the literature and ranged from 4.5 to 12.1 minicuttings per mini-stump

Summary

Introduction

Piptocarpha angustifolia Dusén ex Malme, popularly known as “vassourão branco”, naturally grows in the Araucaria Forest as a pioneer species (Carvalho, 2003; Fossati & Nogueira, 2009). Its high vigor and phenotypic characteristics make this species attractive to the timber industry for potential forestry uses. Especially due its low germination rates, its slow growth rate and lack of uniformity (Fossati & Nogueira, 2009) indicate the need for improving vegetative propagation techniques. Clonal forestry has generated significant advances in the timber production of Brazil and worldwide (Rosado, Rosado, Alves, Laviola, & Bhering, 2012).

Objectives

Methods

Results