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The Vegetative Propagation Possibilities of Black Alder [Alnus glutinosa subsp. barbata (C. A. Mey.) Yalt.] by Softwood Cuttings



Sezgin Ayan, Zeki Yahyaoglu, Vildan Gercek, Aysegul Sahin and Ahmet Sivacioglu
 
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ABSTRACT

In this study, the collecting date of softwood cuttings, rooting media, ortet age and cutting type were investigated on Alnus glutinosa subsp. barbata (C. A. Mey.) Yalt. Rooting media and cutting type showed no significant effect on the rooting percentage (RP), ramet height (RH) and rootlet number (RN) while ortet age showed significant effect on these parameters. The highest RP as 56.7 and 48.3% were obtained for the tip cuttings and basal cuttings of 1+0 aged ortets, respectively, while the lowest RP as 0%, was obtained for the tip cuttings of 2+0 aged ortets. Determining of the lower RP for the cuttings of 2+0 aged ortets than the cuttings of the older ortets can be explained together with the ortet genetic character. The highest RH (18.3 cm) was obtained for the tip cuttings of the 1+0 aged ortets and RN (8.3 number) was obtained for the basal cuttings of the same ortets. The highest mean RP were obtained for the cuttings of 1+0 aged seed originating ortets and physiologically 1+0 aged sprout originating ortets as 41.35 and 35.55%, respectively. Based on the results of this study, basal cuttings of the young ortets, collected in the middle of the June should be used in the autovegetative propagation of Alnus barbata.

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Sezgin Ayan, Zeki Yahyaoglu, Vildan Gercek, Aysegul Sahin and Ahmet Sivacioglu, 2006. The Vegetative Propagation Possibilities of Black Alder [Alnus glutinosa subsp. barbata (C. A. Mey.) Yalt.] by Softwood Cuttings. Pakistan Journal of Biological Sciences, 9: 238-242.

DOI: 10.3923/pjbs.2006.238.242

URL: https://scialert.net/abstract/?doi=pjbs.2006.238.242

INTRODUCTION

Alnus glutinosa (L.) Gaertn. belongs to the genus Alnus the family Betulaceae which comprises about 36 species (Krstinic, 1994). It has a very large range of natural distribution. Such large range in combination with relatively small isolated populations inside it ensures a very marked genetic variability (Weisgerber, 1974).

The black alder becomes a more and more interesting forest tree species due to its multiple uses both in the forestry and in the agroforestry. Owing to symbiotic actinomycetes, it is known as a meliorative species. However, this species proved to be very suitable for tree cultivation either in the form of pioneer plantations or in mixed plantations (Hansen and Dawson, 1982; Heilman and Stettler, 1983). In addition, Alnus genus is pioneers of the riparian zone (Francis et al., 2005); and it could be an effective land rehabilitation strategy of degraded land (Semval et al., 2003).

For the faster growing character than the other six taxa, A. glutinosa subsp. barbata is an economically valuable one among the other naturally distributed black alder taxa in Turkey. In Eastern Blacksea region, the pure forests of this taxon cover an area of 43853 ha; mixed forests also cover an area of 63694 ha. In spite of little proportion (app. 1%) of this taxon’s forest in Turkey’s forest area (Saracolu,, 1998), fast growing character, high biological regeneration ability raise its importance, especially for the region. Also, this taxon is used in the region prevalently, by the local public. At the same time, there are vast suitable potential plantation areas in the region (Çetin, 1988; Ayan et al., 1998).

There are rather limited studies on the autovegetative propagation of the Alnus barbata. And also; contradictory data were given about the vegetative propagation possibilities of the different alder species. For instance; difficulties in propagation of alder with the cuttings were expressed based on Powell’s (1965) study (Atasoy and Küçük, 1986). Having been reached to the unsuccessful results in vegetative propagation of Alnus nepalensis D. Don. which naturally distributed in India, Nepal and Burma, justified the above finding (Anonymous, 2002a). As for Alnus rubra Bong. the rooting of the cuttings were not easily. Also, as a study result, in which, different provenances, cutting collect dates and phytohormones were tested, the highest rooting rate was obtained as 67.9% in the propagation of the Alnus maritime (Marsh.) Nutt. by using softwood cuttings (Anonymous, 2002b). Despite of these, the propagation of alder species using both in-vitro techniques and autovegetative propagation were claimed as possible (Gülbaba et al., 2000). Furthermore, the autovegetative propagation was expressed for Alnus incana (Francis et al., 2005). In Turkey, in the first scientific study on the propagation of Alnus barbata with cuttings, the presence of rooting ability was stated in spite of many difficulties, originating from biology and growing conditions (Atasoy and Küçük, 1986).

The aim of this research is to enhance of propagation possibilities of Alnus barbata with the cuttings directed towards the breeding program. For realizing this, the effects of different ortet age, cutting collect dates, cutting types on the rooting ability of softwood cuttings of Alnus barbata were investigated.

MATERIALS AND METHODS

Greenhouse characteristics: This research was performed in the automatically controlled greenhouse of Eastern Blacksea Forestry Research Institute during 2000 (Exp. I) and 2002 (Exp. II). In the greenhouse, temperature was regulated as 20-25°C, while humidity as 80-90%. Misting was done automatically with the regulation of hygrostat by regulating the time and duration as suitable to the media and cuttings. And this was regulated as 5 sec per 2 min except for extreme conditions. The heating of rooting media were provided with galvanized wires set in the beds.

Materials: The required material for the propagation test with softwood cuttings were obtained from the 1+0, 2+0, 3+0, 4+0 aged seed originating alder seedlings which had been growed in Maçka-Meryemana Research Nursery. Also, the stump sprouts were gotten from Trabzon-Of YemiÕalan village (100 m altitude). The stump sprout cuttings were prepared by using one year-old sprouts of ortets which were 35-40 years-old and 30-40 cm in diameter. The softwood cuttings were gathered in the early morning and carried to greenhouse with icefull boxes. In the same day, cuttings were prepared and planted to the rooting media.

Method
Experiment I. Determination of the collecting date of the softwood cuttings:
In this experiment, the cuttings gathered from the sprouts of 1+0 and 2+0 aged seed originating ortets were used. They were taken at two different dates, as the middle of June and the beginning of the July, 2000. As a pretreatment, the bottom of cuttings were soaked into the mixture of 4000 ppm IBA for stimulating the rooting and 10% rate of Benlate (50% Benomyl active substance) in order to prevent decaying for 10 sec (Atasoy and Küçük, 1986; Kajba, 1998). Both the bottom and tip parts of cuttings were cut smoothly and 2-3 leaves were left on the top of each cutting. In order to reduce the transpiration, the leaf area was reduced by 50-60% with scissors. The cuttings were planted into the rooting media 10 x 10 cm in spacing both Exp. I and II. solution form of compose NPK (9+23+14%) fertilizer which contain high rate of phosphorus and potassium was applied to the all parcels for 2 months with 10 days intervals, in order to induce rooting immediately afterwards the rooting start.

Experiment II. Determination of the rooting media, ortet age, cutting type: The basal and tip cuttings, needed by the test, were obtained from the 1+0, 2+0, 3+0, 4+0 aged seed originating and one year-old stump sprout originating ortets. The same pretreatments were applied in this experiment, too. After planting the cuttings to the rooting media in the greenhouse, in one week’s time, the leaf wetness was controlled and misting time regulated. Since the third weeks of the planting, whether the rooting beginned or not was observed every week. In case of the fungus infection, the cuttings were disinfected with Benlate one time in a week. In this study, Barma peat (BP), 60% Barma peat + 40% perlite (0,6 BP+ 0,4 P) and river sand (RS) media (Table 1), all of which appropriateness were proved for alder among the 15 of rooting media, were used (Yahyaoglu et al., 2002).

At the end of the experiments, the cuttings were carefully removed from the housing and destructive measurements, such as, rooting percentage (RP, %), ramet height (RH-cm) and rootlet number (RN) were recorded.

Experimental design and statistical evaluations: The collected data were evaluated with the TARIST statistical packet program. Multivariate analysis was used to test the treatment effects on rooting parameters.

Table 1:
Treatments applied to the cuttings during the course of the Exp. II

Table 2: Cutting dates, type, ortet ages and rooting level (%) at p<0.05 level

Table 3: Treatment means for assessed rooting parameters*
*Values are the means of three replications

A completely randomized parcels experimental design using three replicates and 20 basal cutting, 10 upper cutting per replicate and the Student-Newman Keuls multiple range test (p = 0.05) were used for mean separation. In addition, correlations between RP, RH RN and ortet age were compared (Duzgunes, 1963). Before variance analysis, arc-sin transformation was applied to the RP data and logarithmic transformation to the RN.

RESULT AND DISCUSSION

Experiment I: From Table 2 it was determined that collecting date and cutting type had statistically significant (p<0.01) effect on RP (F = 17.429, F = 14.172, respectively). Between the cuttings of 1+0 and 2+0 aged ortets, there was no significant difference (F = 1.779 ns) in RP. For the middle June collected cuttings and basal cuttings, the higher rooting capability was determined when compared the beginning of July collected and tip ones, respectively. Also, with respect to the overall mean of RP, the middle June collected cuttings indicated nine times superiority than the beginning of the July collected ones (Table 2). This result was confirmed by the other study in which the beginning of the summer collecting was suggested for broadleaves (Ürgenç, 1982). It was determined that there was four and two times superiority in point of the RP, RN respectively, for the basal cuttings than tip cuttings, in their propagation test by using hardwood cuttings (Yahyaoglu et al., 2002) The bigger number of thick and fine rootlets were gotten for the basal cuttings than tip cuttings on the propagation of the Fraxinus angustifolia Vahl. by using hardwood cuttings (Çiçek, 2005). Also, the studies carried out on plane tree (Platanus occidentalis L.) (Abdullah et al., 1988), on maple (Acer pseudoplatanus L.) (Williams et al., 1991), on elm (Ulmus laevigata) (Kanwar et al., 1996) justified the superiority of the basal cuttings than tip cuttings with regard to root forming. It was explained that the tip cuttings with terminal buds should be preference while using softwood cuttings, contrary to this the basal cuttings without terminal buds for the hard cuttings (Ürgenç, 1982).

Experiment II: As to statistical assessments Table 3 it was determined that rooting media and cutting type factors had no significant effect on the RP, RH and RN parameters. This finding about the rooting media suited to the former researches (Yahyaoglu et al., 2002). Also, ortet age had statistically significant effect on RP (p<0.01, F = 4.757), RH (p<0.05, F = 3.257) and RN (p<0.001, F = 13.384) (Table 4). All of cuttings showed the RP of 0%-56.7%. The highest RP was obtained from the tip (56.7%) and basal (48.4%) cuttings of 1+0 aged ortets. The lowest (0%) RP was obtained from the tip cuttings of 2+0 aged ortets (Table 3).

Table 4:
The comparison of ortet ages according to RP, RN and RH*
*For each character, mean values with the same letters are not significantly different at p<0.05 level, **Rootlet numbers were given as logarithmic value

In the tip cuttings of 1+0 aged ortets, the highest RH (18.3 cm) was obtained. Also, the highest RN (8.3 number) was obtained for the basal cuttings of the same ortets. The lower RP of the cuttings of 2+0 aged ortets than the cuttings of the older ortets can be explained together with genetic character of the ortets.

According to the multiple test results of overall mean, the highest RP were obtained for the cuttings of 1+0 aged seed originating ortets (41.35%) and 1+0 aged sprout originating ortets (35.55%) (Table 4).

The ortet age affects the RP drastically and among the ortet ages used in this study, the cuttings of 1+0 aged seed originating ortets revealed the highest rooting success while the rooting success decrease clearly beginning from the 2+0 aged ortets (Table 4). It was claimed that black alder had evident genetic rooting ability character and successful rooting was not depend only upon the physiological condition of the cuttings, but to a great extent upon the age of ortets (Krstinic, 1994). Together with the ortet age increasing, the falling down of the success of the rooting capacity were alleged for black alder (Kajba, 1993). These findings are supported by this study finding, too. Also, the rooting success of the softwood cuttings pretreated with 4000 ppm of IBA of the 1+0, 2+0 aged ortets were determined as 39% and 22%, respectively. The relative low of the success was connected with the high phenol content of the A. glutinosa (Krstinic, 1994). Nevertheless, in the same study (Krstinic, 1994), it was claimed that rooting of adult black alder trees could be markedly improved by the use of secondary cuttings from ramets obtained by grafting of plus trees. In this research, after the multiple test, having been obtained the highest RP in the cuttings of 1+0 aged sprout originating ortets (35.55%) together with the cuttings of 1+0 aged seed originating ortets (41.35%) justified the above finding. Providing of the well results in the both softwood and hardwood black alder cuttings could be possible by collecting the cuttings from the ortets up to two years old (Krstinic, 1994). It was noticed that the rooting capacity was better in the softwood and hardwood cuttings of the branch sprout, collected from young trees (10-15 age group), than the older ones (Atasoy and Küçük, 1986).

Fig. 1:
The relation between ortet age with RP, RH and RN *, *Ortet ages as 1, 2, 3, 4, 5 pointed to the 1+0, 2+0, 3+0, 4+0 aged seed originating and stump sprout originating ortets, respectively

At p<0.05 level, polynomial relations as 4th, 3rd and 2nd degree determined between the ortet age and RP, RH and RN (R2 = 1, R2 = 0.8619 and R2 = 0.9074 ), respectively. Related formulas were given on Fig. 1.

Based on the results of the present study, the following proposals can be put forward about autovegetative propagation of the Alnus barbata 1) Cutting collect date is an important factor on rooting. The June middle collected cuttings should be preferred to the July beginning collected ones owing to the quite high rooting capability. 2) Because of no difference among the rooting media with regard to the assessed rooting parameters (RP, RH, RN), the more economical one should be preferred. 3) Basal cuttings should be preferred to tip ones because of high rooting performance. 4). For propagating of Alnus barbata by cuttings, 1+0 aged ortets or physiologically regenerated stump and root sprouts should be used as cutting material. This means that, the young ortets must be used in the autovegetative propagation. 5) In spite of no investigation on the genetic capability of the ortets in these experiments, when the obtained data are evaluated, the importance of the ortet on the rooting ability can be easily understandable.

ACKNOWLEDGMENT

This study was supported by Eastern Blacksea Region Forestry Research Institute=s Fund of Environmental and Forestry Ministry.

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