The use of mini-tunnels and IBA for the adventitious rooting of <i>Eucalyptus urophylla</i> S. T. Blake × <i>Eucalyptus pellita</i> F. Muell

Rocha, Fabiana Miranda; Titon, Miranda; Fernandes, Sula Janaína de Oliveira; Santos, Paulo Henrique Rodrigues dos; Laia, Marcelo Luiz de; Pena, Claudilene Aparecida Alves

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Artigo • Ciênc. Florest. 32 (3) • Jul-Sep 2022 • https://doi.org/10.5902/1980509865873 copy

The use of mini-tunnels and IBA for the adventitious rooting of Eucalyptus urophylla S. T. Blake × Eucalyptus pellita F. Muell

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Abstract

The genus Eucalyptus has great importance in forest plantations. However, some species and clones of this genus present difficulties in the seedling production process by the rooting cuttings. Some alternatives have been used to overcome the rooting recalcitrance, such as the use of growth regulators and the use of mini-tunnels in the clonal mini-garden. The objective of this work was to evaluate the effect of the permanence time of mini-ceps under the mini-tunnel and of different concentrations of indole-3-butyric acid (IBA) on the rooting of mini-cuttings of a hybrid clone of Eucalyptus urophylla × Eucalyptus pellita. Four IBA concentrations and a control treatment (0, 1.000, 2.000, 4.000 and 8.000 mg L^-1) and two times in a mini-tunnel (40 and 70 days) were tested. The seedlings produced with higher concentrations of AIB presented mean height and root collar diameter greater than those without the presence of auxin at the exit of the greenhouse. The dry mass of the aerial part presented higher values for the shortest period of mini-tunnel at the exit of the greenhouse. Higher IBA concentrations provided an increase in the number of mini-cuttings rooted at the exit of the greenhouse and area under full sun. The use of 8.000 mg L^-1 of IBA increased the percentage of roots considered optimal, in the two tested mini-tunnel times, and reduced the callus formation, being efficient for rooting in general terms, reaching 95 % at the exit of the area under full sun. The time of use of the greenhouse in the clonal mini-garden did not significantly influence the production of Eucalyptus urophylla × Eucalyptus pellita seedlings under the conditions analyzed.

Keywords:
Cloning; Auxin; Clonal mini-garden; Adventitious rooting; Myrtaceae

Tratamentos		Concentração de AIB (mg.L^-1)					Estufim (dias)
Tratamentos		0	1000	2000	4000	8000	40	70
SCV	H	14,70 b	17,00 ab	16,70 ab	18,80 a	18,30 a	17,10 ns	17,10 ns
	DC	1,73 b	1,85 ab	1,94 ab	1,99 ab	2,17 a	2,02 a	1,86 b
	R	42,50 b	67,50 ab	80,00 a	82,50 a	87,50 a	74,00 ns	70,00 ns
	MSPA	0,26 ns	0,32 ns	0,30 ns	0,26 ns	0,26 ns	0,31 a	0,25 b
SAA	H	12,60 ns	14,50 ns	14,20 ns	14,30 ns	13,50 ns	13,40 ns	14,20 ns
	DC	1,29 ns	1,33 ns	1,42 ns	1,28 ns	1,26 ns	1,34 ns	1,29 ns
	R	45,00 ns	70,00 ns	65,00 ns	60,00 ns	80,00 ns	61,00 ns	67,00 ns
	MSPA	0,47 ns	0,58 ns	0,57 ns	0,62 ns	0,66 ns	0,63 ns	0,54 ns
	MSR	0,32 ns	0,32 ns	0,29 ns	0,36 ns	0,34 ns	0,35 ns	0,30 ns
SAPS	H	25,90 ns	28,90 ns	29,90 ns	30,70 ns	31,50 ns	27,80 b	31,00 a
	DC	2,13 b	2,31 ab	2,37 ab	2,55 a	2,59 a	2,35 ns	2,4 ns
	R	98,90 ns	97,50 ns	98,60 ns	98,10 ns	97,60 ns	98,30 ns	97,90 ns
	MSPA	1,32 ns	1,57 ns	1,62 ns	1,62 ns	1,58 ns	1,43 ns	1,64 ns
	MSR	0,64 ns	0,67 ns	0,61 ns	0,62 ns	0,61 ns	0,60 ns	0,66 ns

Universidade Federal de Santa Maria Av. Roraima, 1.000, 97105-900 Santa Maria RS Brasil, Tel. : (55 55)3220-8444 r.37, Fax: (55 55)3220-8444 r.22 - Santa Maria - RS - Brazil
E-mail: cienciaflorestal@ufsm.br

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Engenheira Florestal, Ma., Analista Socioambiental. • fabiana.engflorestal@gmail.com