Number of leaflets on rooting of lychee herbaceous cuttings/Numero de foliolos no enraizamento de estacas herbaceas de lichieira.
The cutting method has a great potential to replace or supplement the use of layering, as it has all the advantages of vegetative propagation. In addition, it allows obtaining a large number of individuals from one mother plant, in addition to a low production cost (CARVALHO et al., 2005).
In this method, the presence of leaves in the cuttings is a relevant factor to promote rooting. The leaves are sources of auxins and other cofactors that can be translocated to the cutting base and induce the formation of adventitious roots, as shown in blueberry trees (MARANGON & BIASI, 2013). Conversely, the excessive presence of leaves or leaflets, can lead to dehydration of the material to be propagated and damage the rhizogenesis process, as occurred with peach tree cuttings (MINDELLO NETO, 2006).
Several studies have evaluated the effect of the indolebutyric acid (IBA) on rooting of stem cuttings in fruit tree species. There is an AIB concentration (1000mg[L.sup.-1]), which is among those already studied, that has allowed to obtain satisfactory responses in fruit tree species, such as the avocado (MINDELLO NETO et al., 2007) and jamboleiro trees (ALCANTARA et al., 2010).
Therefore, the objective of this study was to evaluate the influence of the number of leaflets in cloning, by cutting, of lychee tree herbaceous branches treated with IBA (1000mg[L.sup.-1]).
The experiment was conducted in an intermittent mist chamber in the area for production of fruit tree seedlings (Department of Plant Production, Faculdade de Ciencias Agrarias e Veterinarias, FCAV, UNESP, campus of Jaboticabal, SP, Brazil) with six-year-old herbaceous cuttings of the 'Bengal' lychee tree were used to perform the experiment. They belonged to the Active Germplasm Bank, Department of Plant Production, FCAV, UNESP) and were originated by air-layering.
Branches were collected in the morning and taken to the propagation area, in the fruit production area. Then, the cuttings were taken from the terminal portion of the branches (standard length: ca. 10cm), bevel cut at their base to increase the response area, and immersed (5s) in an IBA alcoholic solution (1000mg [L.sup.-1]). Treatments consisted of cuttings with zero (0), one (1), two (2), three (3), or four (4) leaflets.
Then the cuttings were placed in perforated plastic trays (dimensions: 40x30x10cm) previously filled with expanded middle-texture vermiculite. They were maintained in a mist chamber (spraying: 15s; time interval: 45sec) under greenhouse conditions (shade: 50%). After 180 days, the cuttings were evaluated for percent rates of survival and rooted cuttings, and number and average length of roots per cutting.
The completely randomized design was used in the experiment, with 5 treatments (0, 1, 2, 3, or 4 leaflets present in the cutting), and each experiment was composed of 4 replicates and 10 cuttings per experimental plot. For data analysis, the rooting and survival percentages were calculated, and the number and length of roots were recorded. The rooting and survival percentages, and the number and length of roots were assessed by analysis of variance (ANOVA; [alpha]=0.05). The mean values for the studied variables were compared with the Fisher' spost hoc least significance difference (LSD; [alpha]=0.05) tests. Nonlinear regressions analyses were performed for all variables.
[FIGURE 1 OMITTED]
For survival percentage, it could be observed that total absence of leaflets in the cuttings results due their death, generated values equal to zero (Figure 1). Conversely, when only treatments in the presence of leaflets are compared, it becomes clear that presence of only one of them is sufficient for the mean values to be greater than 70% (Table 1). Possibly, this is due to the synthesis of phenolic compounds which are synthesized in the leaves. These compounds contribute to maintain the cutting survival, which may indicate a natural stimulus to rooting, acting as a facilitator of the rooting process in cuttings (FACHINELLO, 1995).
Regarding rooting of cuttings, a higher sensitivity to reduction in the number of leaflets is observed, and rooting is greatly affected in cuttings with one to three leaflets (Figure 1). However, the rooting potential with four leaflets demonstrated to be much more effective, reaching up to 60% of rooting, being also higher than other treatments (Table 1). For PAIVA & GOMES (2011), the presence of leaves in cuttings becomes indispensable to some species, as they are natural sources of auxins, carbohydrates, and other factors. According to HARTMANN et al. (2002), they also greatly contribute to the success rooting of cuttings when these substances are accumulated in appropriate amounts in the regeneration zone.
As the number of leaflets increased, an increase was observed in the mean values for number and length of roots, which reached their maximum values (2.3 and 3.14, respectively) (Figures 2A and 2B). Presence of four leaflets provided significantly superior results in relation to cuttings with one, two, and three leaflets (Table 1).
This result can be explained by the fact that cuttings with a greater number of leaflets have a greater amount of auxins available. They potentiate the cuttings ability to emit roots and contributed to improve the quality of the root system (which did not occur in cuttings with fewer leaflets) when they are associated with exogenous application of IBA (1000mg [L.sup.-1]).
[FIGURE 2 OMITTED]
In general, it was observed that preservation of four leaflets was advantageous for all variables. According to PACHECO & FRANCO (2008), such increase in all of them is probably linked to the presence of leaflets or leafs, which are sites of synthesis of various co factors involved in promoting rooting. For the lychee tree, however, it is important to emphasize that not only the presence of leaflets, but also keeping the maximum number of them is essential for the cuttings to reach the maximum rooting, with optimal quality of the root system.
The authors acknowledge the financial support from Coordenacao de Aperfeijoamento de Pessoal de Nivel Superior (CAPES).
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Ediane Conceicao Alves (I) Joao Emmanuel Ribeiro Guimaraes (II) Camila Kauffmann Becaro Franco (II) Antonio Baldo Geraldo Martins (II)
(I) Departamento de Fitotecnia, Universidade Federal de Vijosa (UFV), 36570-900, Vijosa, MG, Brasil. E-mail: email@example.com. Corresponding author.
(II) Departamento de Producao Vegetal, Universidade Estadual Paulista (UNESP), Jaboticabal, SP, Brasil.
Received 03.24.14 Approved 11.11.15 Returned by the author 03.16.16 CR-2014-0435.R2
Table 1--Mean percentages and standard errors for survival, rooting, number, and length of roots as a function of the number of leaflets. Variables Number of leaflets 1 2 Survival 85 [+ or -] 5.0ab 77.5 [+ or -] 12.5b Rooting 22.5 [+ or -] 7.5bc 10 [+ or -] 4.1c Number of roots 0.5 [+ or -] 0.18bc 0.2 [+ or -] 0.11c Growth of roots 0.75 [+ or -] 0.30bc 0.12 [+ or -] 0.08c Variables Number of leaflets 3 4 Survival 97.5 [+ or -] 2.5a 95 [+ or -] 2.9ab Rooting 30 [+ or -] 0.01b 60 [+ or -] 7.1a Number of roots 0.8 [+ or -] 0.17b 2.3 [+ or -] 0.54a Growth of roots 1.67 [+ or -] 0.83b 3.14 [+ or -] 0.62a Variables F R2 P Survival 41.86 0.92 <0.001 Rooting 21.41 0.85 <0.001 Number of roots 3.39 0.26 <0.001 Growth of roots 3.18 0.25 <0.001 One-way ANOVA, with the Fisher's post hoc least significance difference test. Mean values with the same letters are not significantly different from each other; P>0.05; [R.sup.2]: coefficient of determination.
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|Author:||Alves, Ediane Conceicao; Guimaraes, Joao Emmanuel Ribeiro; Franco, Camila Kauffmann Becaro; Martins,|
|Date:||Jun 1, 2016|
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