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Variability of Morphological and Biological Characteristics of Wild Service Tree (Sorbus Torminalis (L.) Crantz) Fruits and Seeds from Different Altitudes

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Variability of Morphological and Biological Characteristics of Wild Service Tree (Sorbus Torminalis (L.) Crantz) Fruits and Seeds from Different Altitudes PERIODICUM BIOLOGORUM UDC 57:61 VOL. 111, No 4, 495–504, 2009 CODEN PDBIAD ISSN 0031-5362 Original scientific paper Variability of morphological and biological characteristics of Wild Service Tree (Sorbus torminalis (L.) Crantz) fruits and seeds from different altitudes Abstract MILAN OR[ANI]1 DAMIR DRVODELI]1 Aims and objectives of research: The study aimed to research the influ- TOMISLAV JEMRI]2 ence of altitude on dimensions, i.e. the shape of Wild Service tree fruits IGOR ANI]1 1 (Sorbus torminalis (L.) Crantz). We also wanted to test the variability of STJEPAN MIKAC major biological characteristics of fruits and seed, the elements of seed qual- 1 University of Zagreb ity and their relations. Faculty of Forestry Materials and Methods: In September 2003 we gathered fruits from 24 Department of Ecology and Silviculture Wild Service Trees of different ages and positions in the stand structure on P. P. 4 2 2 HR – 10002 Zagreb, Croatia three sites (Medvednica, Psunj and Ju`ni Dilj) situated at different alti- tudes. The altitude of each tree was determined with the GPSmap 60CSx 2 University of Zagreb device, after which dendrometric measurements were carried out and fruits Faculty of Agriculture were collected. We measured fruit length (FL) and width (FW) and calcu- Department of Pomology lated their index (FL/FW). The mass of each fruit was weighed on the labo- Sveto{imunska 25 HR – 10000 Zagreb, Croatia ratory scales Sartorius and the number of fruits per kilo was calculated. The seeds were manually extracted from the fruits and the number of filled Correspondence: (sound) seeds per fruit was counted in line with the ISTA rules. In order to Milan Or{ani} break the double seed dormancy we applied the stratification in accordance University of Zagreb with the ISTA rules. For the statistical analysis of the data we used ANOVA, Faculty of Forestry Department of Ecology and Silviculture LSD test, correlation analysis and canonical discriminant multivariate P. P. 4 2 2 analysis with the locality as a grouping variable. All statistical analyses were HR – 10002 Zagreb, Croatia performed using STATISTICA 8.0 program package. E-mail: milan.orsanic3ºzg.t-com.hr Results: We obtained a positive and strong correlation between fruit Key words: Wild Service Tree, Sorbus length and altitude (R=0.67), i.e. between fruit shape index and altitude torminalis (L.) Crantz, fruit morphology, seed (R=0.71), which means that the higher the altitude of the population of the morphology, seed variability, altitude Wild Service Treein the Republic of Croatia, the longer the fruits. At higher altitudes the Wild Service Treeseed shows a larger degree of dormancy and requires somewhat longer period of stratification. Conclusion: The observed differences between the three studied loca- tions might be attributed to changed climatic and soil conditions. INTRODUCTION he genus Sorbus L. (Rosacee: Maloideae) encompasses around 250 Tspecies distributed in the northern hemisphere of which 91 are na- tive to Europe (1). According to Warburg and Kárpáti (2) there are only 19 species growing in Europe while the latest multivariate research of the genus Sorbus distinguishes between 12 species only (3). Most of the Received July 17, 2009. European species from the genus Sorbus (70 out of 91) are of hybrid ori- gin (3). M. Or{ani} et al. Variability of morphological and biological characteristics of Wild Service… The Wild Service Tree (Sorbus torminalis (L.) Crantz) animals (zoohoria), mostly birds. According to Bednorz is a deciduous species which reaches the height of up to (10) and many other sources Wild Service Tree fruits 30 meters. It has a round dense crown and a straight contain between 2 and 4 seeds. When researching the trunk whose DBH ranges from 50 to 70 (even up to 100) sub family Maloideae Rocher et al. (11) found out that cm. Its root system first has a taproot and later is only 25 to 50% of the gynoeciums in a fruit develop into heart-shaped (4). mature seeds. Aldasoro et al. (3) point out that the char- The Wild Service Tree is native to western, central acteristics of Wild Service Tree fruits and seeds are influ- and southern Europe, northern Africa, the Crimea, Asia enced by the way the seeds are dispersed in nature (fruits Minor, Caucasus and Transcaucasia. It grows at altitudes are eaten and dispersed by birds and mammals), which of up to 900 meters. According to Kausch (5) the north- can significantly reduce the phylogenetic difference. Ac- -western edge of its distribution area starts on the British cording to McAllister (12) certain fruit characteristics, Isles where it reaches up to 54 degrees of the northern lat- such as its size, are strongly influenced by site factors. itude. It does not grow in the lowlands of the Nether- The variability of Wild Service Tree fruits in size and lands, in the north-western parts of Germany and on the shape is a well-known fact. Kárpáti (13) gives a list of peninsula of Jutland. It is distributed in Asia Minor, the seven different fruit shapes: typus, sphaerocarpa, pisifera, Balkan peninsula (except for the southern parts of Gre- macrocarpa, microcarpa, dolichocarpa and pomoida. ece), on the territory of Italy and the Iberian peninsula Id`ojti} et al. (14) write about the variability of a spe- with some isolated populations seen in the north-eastern cies as the basis for successful adaptation to changing part of Africa while it is most frequently found in France. conditions of the environment during its long life cycle, In Croatia it grows in mosaic pattern communities, which in the long run is important for the survival of the i.e. as solitary trees or in small groups, mixed with other species, i.e. variability ensures adaptability of popula- species, mostly in thermophilic forest communities of tions to changes in the environment over generations. the Downy and Sessile oak and on sunny positions. It is Negative factors that undermine the variability of the rarely seen in the Mediterranean zone of Croatia (6). Ac- Wild Service Tree are: excessive commercial exploita- cording to Mati} and Vukeli} (7) it can be more fre- tion, narrow genetic base of small populations, failure of quently found in the sub-Mediterranean zone, especially natural regeneration, competition from other species, in- in its wetter and colder parts. It quite frequently occurs adequate silvicultural practices and uncontrolled seed on higher positions of the Mediterranean mountainous transfer (15). belt (altitudes of up to 700 meters) in the community The genetic variability of the Wild Service Treeon the with Downy oak and European Hop-hornbeam (Ostryo- basis of polymorphysms of enzymes was mainly research- -Quercetum pubescentis Ht. 1938). This community oc- ed in France (16) while the study of variability on the ba- curs as an extrazonal type in continental Croatia and as a sis of morphological characteristics of leaves and fruits rule thrives on rendzic leptosol, limestone and dolomite was conducted in Croatia (14). on exposed and warm positions. The aim of this paper was to research the influence of Mati} and Vukeli} (7) describe the Wild Service Tree altitude on dimensions, i.e. the shape of Wild Service as a pioneer and a postpioneer species with broad ecolog- tree fruits (Sorbus torminalis (L.) Crantz). ical valency.The authors see it as a side species contribut- ing to biological diversity, stability of the stand, support RESEARCH AREA to the main tree species and improvement of the soil quality. It is a semiskiophilic species and, when young, is In September 2003 fruits were collected from 24 Wild quite tolerant to shade but later requires plenty of light. It Service Trees at three sites in the Republic of Croatia ranges between thermophilic and mesophilic species which with different average altitudes: Medvednica (9), Psunj tolerates drought, cold and late spring frosts. (6), and Ju`ni Dilj (9). The selection criteria were a min- imum distance of 50 meters between the trees and well- The Wild Service Tree flowers in May and June and -developed fruits. The selected trees had different diame- begins yielding at the age of 25 to 30. The variations in ters and positions in the stand structure. The Wild flowering between the populations depend on the micro Service Trees on Medvednica grow at an average altitude climate while the fruits ripen in October. In the northern of 499±34 m, on Ju`ni Dilj at 272±52 m and on Psunj at parts of its distribution area the fruits of the Wild Service 226±21m. The altitude of the trees on Medvednica is by Tree mature about a month later than in the center (8) 227 meters higher compared to Ju`ni Dilj and 73 meters while the fruits on the shaded trees do not fully ripen compared to Psunj. The lowest average height difference even during warm and sunny years (9). of 46 meters was measured the trees on Psunj and Ju`ni The fruits of the Wild Service tree are counter ovoid Dilj. to globose, brown with white spots, 14–18 mm long, and 8–15 mm wide, edible and come in corymbs of 5–10. The MATERIALS AND METHODS fruit pericarp comprises a membrane exocarp (skin), pulp (flesh) and endocarp (core). The fruits which ripen Each tree on the selected localities was recorded with in September and October contain up to four elongated, GPSmap 60CSx which was also used to determine alti- dark brown seeds up to 7 mm long. They are dispersed by tudes. The fruit yield was graded on the scale of good, 496 Period biol, Vol 111, No 4, 2009. Variability of morphological and biological characteristics of Wild Service… M.
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