Vegetative propagation of an ornamental conifer: some techniques in podocarpo cutting

Propagação vegetativa de uma conífera ornamental: algumas técnicas no estaqueamento de podocarpo

ABSTRACT:

The asexual propagation of conifers, such as Podocarpus macrophyllus (Thunb.) Sweet, faces difficulties. Among the factors that can improve the efficiency of asexual propagation are the types of cuttings used and lesions performed at the base of the cuttings, and the use of plant regulators, such as indolebutyric acid (IBA). This study determined the types of lesions to be performed at the cutting base, the type of cuttings used, the method to convey IBA at the cutting base, and the concentration of IBA required to obtain a proper rooting condition for the species. Two experiments were performed from March to July, 2018, in randomized blocks and with a factorial scheme, as follows: 2 x 4 (IBA application in solution and talc x IBA at concentrations of 0, 500, 1,000, and 1,500 mg L^-1 IBA); and 2 x 3 (basal and apical cuttings x bevel, wedge, and horizontal lesions at the cutting base). In both experiments, the cuttings used were arranged on a masonry bed containing medium-textured sand. After 120 days of experimentation, the study concluded that the rooting percentage was favored by the use of basal cuttings with wedge lesions at the cutting base and treated with IBA in solution at a concentration of approximately 550 mg L^-1.

Key words:
Podocarpus macrophyllus (Thunb.) Sweet; asexual propagation; buddhist pine; rooting.

RESUMO:

A propagação assexuada de coníferas, como o Podocarpus macrophyllus, apresenta dificuldades. Entre os fatores que podem tornar mais eficientes a propagação assexuada tem-se o tipo da estaca utilizada, lesões na base da estaca e uso de fitoreguladores, como o ácido indolbutírico (AIB). Objetivou-se determinar o tipo de lesão a ser efetuado na base da estaca e o tipo de estaca bem como método de veiculação do AIB na base da estaca e a concentração do AIB visando obter melhor enraizamento para a espécie. Dois experimentos foram realizados, no período de março a julho de 2018, em blocos casualizados e esquema fatorial, sendo o primeiro 2 x 4 [aplicação AIB em solução e em talco x concentração de 0, 500, 1000 e 1500 mg L^-1 de ácido indolbutírico (AIB)] e o segundo 2 x 3 [estaca basal e apical x lesões na base da estaca do tipo bisel, cunha e horizontal].Em ambos experimentos as estacas utilizadas foram dispostas em canteiro de alvenaria contendo areia de textura média. Após 120 dias de experimentação conclui-se que o uso de estacas basais com lesões na base da estaca em cunha e tratadas com AIB em solução na concentração de aproximadamente 550 mL L^-1favorecem a porcentagem de enraizamento.

Palavras-chave:
Podocarpus macrophyllus (Thunb.) Sweet; propagação assexuada; pinheiro de buda; enraizamento.

INTRODUCTION:

The Podocarpaceae is composed of 18 genera and about 173 species of coniferous trees and shrubs. Plants of this family have simple, complete, alternate or subopposite, rarely opposite (Microcachrys Hook. f.), coriaceous, linear, lanceolate, acicular, oval, or scale-like leaves with whole margins. The seeds have fleshy external and woody internal teguments, and the embryo has two cotyledons (MARINHO et al., 2016). Among the species of interest belonging to this family, the Buddhist pine Podocarpus macrophyllus (Thunb.) Sweet (synonym: Taxus macrophylla Thunb.) stands out for its ornamental value and expressive use in landscaping. Sexual propagation of the species has some limitations, such as difficulty in obtaining seeds. This leads to non-uniformity in the achievement of seedlings and is in line with the fact that conifers are often characterized by great longevity and a low potential rate of population increase compared with angiosperms, putting them at a competitive disadvantage. An alternative to circumvent these characteristics is asexual propagation by cutting (LORENZI & SOUZA, 2013).

The asexual propagation of conifers such as P. macrophyllus faces challenges regarding rooting associated with the plant’s maturation stage, a process that is age-related and affects reproductive competence, morphology, and growth rate (ENRIGHT & JAFFRÉ, 2010; RAGONEZI et al., 2010). Another issue is related to functional restrictions in the growth rate resulting from a less efficient vascular system than that of angiosperms. In the vascular system of conifers, tracheids are usually more resistant to solute flow than angiosperms’ vessels, and their leaves are not fully vascularized (ENRIGHT & JAFFRÉ, 2010).

Among the factors that can make asexual propagation more efficient is the cutting type used (VILLA et al., 2017). The chemical composition from the base to the tip of a branch can differ, leading to dissimilarities among the use of basal, median, and apical cuttings (ZANÃO et al., 2016). Overall, the number of roots obtained from a cutting decrease from the basal to the apical parts of a branch, i.e., the rooting capacity of basal cuttings is greater than apical cuttings (VIEIRA NETO et al., 2011). Moreover, as the cutting base accumulates carbohydrates, root development will be favored (HARTMANN et al., 2018).

Regarding cuttings, the practice of performing lesions at the base may contribute to root formation because there is greater absorption of water and phytohormones, increasing the efficiency of rooting (SANTORO et al., 2010). Cell division is stimulated by the increased respiratory rate and auxin, carbohydrates, and ethylene levels in the injured area. In turn, the lesions allow the physical barrier formed by the sclerenchyma rings to be broken, which may even prevent root emergence (HOSSAIN et al., 2019; HUNT et al., 2011).

Another way to enhance the formation of the root system is to use plant regulators to induce the rhizogenic process and increase the percentage of cuttings forming roots, the number and quality of roots formed, and the uniformity in rooting (CIRIELLO et al., 2015; HUNT et al., 2011). Although, indolebutyric acid (IBA) is the most widely applied substance for this purpose, there are still issues in making specific recommendations for using this plant regulator (SALVADOR et al., 2014). Compared to other auxins of localized action, IBA is also photostable, persistent, non-toxic at a wide range of concentrations, not degraded by biological action, and has little mobile in the cutting, thus remaining longer at the application site (CORDEIRO et al., 2016). Besides, it can be applied in a liquid or powder form (YAMAMOTO et al., 2010).

The vegetative parts (foliage) and potted plants of P. macrophyllus have great importance in the ornamental plant sector and are widely sold in Veiling (Holambra, São Paulo state, Brazil) and grown in gardens in several Brazilian states. However, its propagation for seedling production is still unknown (PROPLANT, 2012; TOGNON & CUQUEL, 2015). In this context, this study improved the techniques used in rooting P. Macrophyllus cuttings by evaluating the lesion type to be performed at the cutting base and the cutting type, as well as the method of propagation of IBA at the cutting base and the most effective IBA concentration.

MATERIALS AND METHODS:

Experiments were carried out from March to July, 2018, both of which were developed at the Professor Doutor Mário Cesar Lopes Protected Cultivation and Biological Control Station, belonging to the Protected Cultivation and Horticulture Experimental Station of Unioeste, Marechal Cândido Rondon Campus, Paraná state, Brazil (24º33’22”S, 54º03’24”W; approximate altitude of 420 m. The experiments were conducted under 50% shading roof conditions. The three-year-old parent plants used for removing the cuttings were derived from asexual propagation; they were purchased from an ornamental plant producer in the municipality of Marechal Cândido Rondon. The 1.2 m tall parent plants were transplanted into 12 L polyethylene pots containing a mixture of latosol, washed sand, and organic matter (1:1:1, v/v/v)as a substrate and were acclimatized in the shade for 90 days before being used in the experiments.

The visual control of pests and diseases was performed weekly, both on the parent plants and removed cuttings. Whenever necessary, agricultural pesticides were applied. The visual control of cochineals was performed during the experimental period using the commercial product Chlorpyrifos Fersol 480 EC (150 ml/100 L water; chlorpyrifos as the active ingredient) + mineral oil (1 L/100 L water). Irrigation was performed daily using a sprinkler irrigation system activated for 5 min and 1 h average intervals, with a flow rate of 1.17 x 10-8 m^³ s^-1. The average temperature during the experiment was 22.4 °C, and the relative humidity was 73.14%.The IBA used in the first experiment was weighed in a precision balance and diluted in 0.1 L of ethanol hydrated at 46.2° INPM (Brazil’s Institute of Weights and Measures); then, 0.1 L of distilled water was added, resulting in 0.2 L of the final concentrations (500, 1,000, and 1,500 mg L^-1). Toprepare IBA in talc, the amount corresponding to each concentration was mixed in commercial talc (Plastofibras^®) until 100 g of the product was achieved. For better homogenization, ethanol was added to form a paste; this mixture was then transferred to an oven at 40 ^oC, where it remained until the solvent evaporated.

Branches were removed from the parent plants with pruning shears along the entire length of the plant, i.e., from different plant heights. The 10 cm long cuttings were prepared from these branches by discarding the apical part; four leaves were kept per cutting and were used in the first experiment. The cutting base was dipped for 10 s in the prepared IBA solutions. For the control treatment (without IBA), the cutting bases were dipped in distilled water for 10 s. For those with talc, the base was placed in contact with the product for 15 s until it was well adhered. For the control treatment, the base was only left in contact with inert talc.

For the second experiment, the branches were removed from the parent plants as a whole. From these branches, cuttings of approximately 10 cm in length were prepared with the apical and basal parts, keeping four leaves per cutting. At the cutting base in experiment 2, three lesion types were performed with a utility knife. Bevel lesions were performed with a diagonal cut, wedge lesions were done with a diagonal cut on each side of the cutting base, and horizontal lesions were performed with a straight cut perpendicular to the cutting.

In both experiments, immediately after being treated, the cuttings were arranged in a masonry bed containing washed sand of a medium texture. The sand was previously sterilized with 1 L of sodium hypochlorite diluted in 10 L of water, which was sprinkled over its entire area with a watering can. After 120 days, the percentage of rooted and calloused cuttings, number of roots, and length of the largest root (cm) were evaluated for each experiment. Within each replicate containing 15 cuttings, five were randomly analyzed. These cuttings had the roots carefully washed in running water and dried with paper towels. For the variables involving percentages, counting performed and then the percentage was calculated. A graduated ruler was used for measuring the length of the largest root.

For the first experiment, the experimental design used was randomized blocks in a 2 x 4 factor scheme (application of IBA in solution and talc x IBA at concentrations of 0, 500, 1,000, and 1,500 mg L^-1), resulting in eight treatments. Three replicates and 15 cuttings per replicate were used, totaling 360 cuttings. In the second experiment, the experimental design used was randomized blocks in a 2 x 3 factor scheme (basal and apical cuttings x bevel and wedge lesions and control), resulting in six treatments containing three replicates and 15 cuttings per replicate, totaling 270 cuttings.

The means of the qualitative variables were submitted to an analysis of variance and were later compared by a Tukey’s test, at a 5% probability of error. The mean values of the quantitative variables were submitted to a regression analysis using the Sisvar software (FERREIRA, 2011).

RESULTS AND DISCUSSION:

In the first experiment, the percentage of rooting was significant for the interaction of the IBA concentration x IBA conveying methods, and the percentage of calloused cuttings was significant only for the IBA conveying method. The number and length of the roots were not significantly affected by the IBA concentrations and propagation method.

Regarding rooting, the immersion method increased the rooting percentage up to 78.29% at an IBA concentration of 550 mg L^-1 (Figure 1). The use of talc to convey IBA did not significantly increase rooting. With talc, there may have been non-uniformity in the amount of powder adhered to the cutting, which may have affected rooting. This amount would be affected by moisture at the cutting base and the epidermis texture. There are indications that, in this conveying method, the concentrations of IBA used should be doubled. For example, if the best results are obtained with a solution of 1,000 mg L^-l of IBA, then 2,000 mg kg^-1is necessary for using the powder form to overcome this non-uniformity (PEREIRA et al., 2015).

Figure 1
Rooting percentage of podocarp cuttings with different concentrations of IBA in the form of hydroalcolic solution and talc.

DOBNER et al. (2018) studied Cupressus lusitanica and Cryptomeria japonica, and reported that the use of IBA (0-6,000 mg L^-1), in both a liquid medium and inert talc, was not efficient in inducing the rooting of cuttings obtained from adult trees of the two species. They suggested that possible phytotoxicity as a result of the concentrations used and the age of the parent plants (12 and 19 years old) were the cause.

The percentage of calloused cuttings was significantly affected by the IBA conveying method, and the use of talc resulted in lower values compared with the use of the solution (Table 1).

Table 1
Percentage of podocarp cuttings with callus treated with different methods of application IBA.

Methods of application	Callus cutting (%)
Solution	3.96 b
Talc	1.82 a

• ^*Means followed by the same lower-case letter do not differ in the column by the Tukey test, at 5% probability of error. Data transformed by square root of X + 1.0.

Cell multiplication is one of the stages for the formation of new adventitious roots during rhizogenesis, a characteristic that is also present in the development of calluses. Although, these are independent events, they can co-occur without a direct relationship. Therefore, callus formation is not a guarantee of root formation, with cuttings with a lower percentage of calluses preferred for forming roots (SILVA et al., 2015).

Of the variables analyzed in experiment 2, the number of rooted cuttings was significant, for which there was an interaction between the cutting type and the lesion type at the base. The rooting of base cuttings did not statistically differ among the lesion types at the cutting base, i.e., regardless of the lesion type caused at the cutting base, the values were statistically similar. However, when analyzing the percentage values, it should be noted that the use of the wedge lesion increased rooting by approximately 8% and 2.5% compared with the bevel type and horizontal type of lesions (Table 2).

Table 2
Percentage of rooting of podocarp cuttings with different lesions at the base of the cut and types of cut.

Types of CUT	Withdrawals from cuttings
	Basal	Apical
Wedge	91.11 Aa	82.22 Aa
Bevel	84.44 Aa	51.11 Bb
Horizontal	88.89 Aa	77.78 Aa

• ^*Means followed by the same lower-case letter do not differ in the column by the Tukey test, at 5% probability of error.

Concerning apical cuttings, there was a statistically significant difference between the wedge and horizontal lesions compared with the bevel type, with the latter showing lower rooting percentage values. Although, not statistically significant, the wedge lesion had 5.5% more rooting than the control. The wedge lesion showed a superior rooting percentage, and there was no statistically significant difference between using basal or apical cuttings for this type of lesion. However, by using basal cuttings, it was possible to have 10% more rooting.

WENDLING et al. (2016) studied araucaria cuttings (Araucaria angustifolia) and found that apical cuttings rooted faster and showed better characteristics for the evaluated parameters. The authors discussed that endogenous auxin concentrations could explain this result, since the hormone is produced by the apical meristematic tissues and is taken to the cutting base where, together with other substances, it acts in rhizogenesis induction.

SOUZA et al. (2015) reported a significant difference when using apical and basal cuttings for hibiscus (Hibiscus rosa-sinensis L.) propagation, obtaining average values for apical and basal cuttings of 3.3 and 75%, respectively. This is because basal cuttings present a semi-woody constitution compared with the apical part, thus resulting in greater tissue maturity anda greater capacity to provide the carbohydrates necessary for root growth. The most suitable cutting type can vary among species and/or the cultivar used, since these can differ in the chemical composition variations of the tissues along the branch. Therefore, cuttings from different parts tend to differ in rooting. For example, apical cuttings are closer to the auxin synthesis site and have less tissue differentiation, which usually facilitates adventitious root formation (RINALDI et al., 2017; CUNHA et al., 2015).

Results obtained help to clarify issues of vegetative propagation of this importantlandscape species. From this study, future research can be conducted to improve propagation, for example, on the use of talc and different IBA concentrations, as talc provided a lower percentage of calloused cuttings.

CONCLUSION:

Basal cuttings of P. macrophyllus with wedge lesions at the base and treated with IBA in solution at a concentration of 550 mg L^-1 can be used to obtain good results for asexual propagation.

ACKNOWLEDGMENTS

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil.

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• CR-2018-0896.R3

Publication Dates

• Publication in this collection
  26 May 2021
• Date of issue
  2021

History

• Received
  31 Oct 2018
• Accepted
  11 Jan 2021
• Reviewed
  11 Mar 2021