Silvae Genetica Journal Impact Factor & Information
Current impact factor: 0.24
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Silvae Genetica website
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JD Sauerlaender's Verlag
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Publications in this journal
This study was performed to estimate the abilities of
eucalyptus clones to exercise as well as to tolerate competition
and to compare their behaviors under auto- or
allocompetition. Six commercial clones, belonging to
PLANTAR S/A enterprise were evaluated for breast
height circumference (BHC), total height (TH) and volume
(VOL). At three locations of Minas Gerais, Brazil
(two in Curvelo and one in Felixlândia) the clones were
planted in two spaces. At 36 months of age each clone
was evaluated for exercising and toleration competition
amongst each other. The design for each experiment was
similar to that of the nine-hole system; the center clone
being under competition and the eight surrounding the
center clone exercising competition. Each clone under
competition was repeated eight times; therefore, for
each spacing and location, six contiguous experiments
were conducted. From the mean values; the parameters
of ability to exercise competition (ci), ability to tolerate
competition (tj), the specific competitive ability (sij) and
the performance per se of the clones (aj) were estimated
using a model similar to that of diallel crosses. The
clones differed as to their ci, tj and aj. No one clone
exhibited high and positive ci and tj. Regardless of location,
spacing, or clone, the performance of autocompetition
is similar to that of allocompetition. This indicates
that a mixture of clones, if advantageous from the management
or industrial point of view, may be performed
without harm to the volume of wood produced.
Silvae Genetica 01/2014;
This paper describes a method to obtain haploid and doubled-haploid (DH) embryos using anther cultures of holm oak (Quercus ilex L.). The production of haploids and DH through gametic embryogenesis provides an attractive biotechnological tool for developing homozygous lines from heterozygous parents, which is important in breeding programs, as well as in genetic studies. As a consequence, protocols to produce homozygous plants have a significant impact on forest tree improvement. Anthers were subjected to different temperature treatments for embryo induction: a cold pre-treatment (4°C) from 3 to 7 days was carried out at the beginning, followed by a heat shock (33°C) from 2 to 5 days. Most anthers responding to these stress treatments contained vacuolated microspores, indicating that this developmental stage is responsive to embryogenesis induction in holm-oak microspores. In all cases, embryos grew from the interior of the anthers, breaking through the degenerating anther walls. Under these conditions, embryo formation occurred in 31 anthers between 46 and 95 days after culture initiation. Embryo analysis performed with flow-cytometry and DNA-microsatellite markers showed haploid profiles and/or spontaneous doubling of the chromosomes during early regeneration stages. This is, to our knowledge, the first published report on gametic embryogenesis in holm oak.
Silvae Genetica 11/2013; 62(4-5):210-217.
Individuals of the genus Populus are mostly dioecious, although deviations from strict dioecism occasionally occur. The aim of this study was to determine whether six, rare monoecious Populus nigra var. nigra trees, identified in trial plots, were fertile and capable of sexually reproducing. Controlled pollinations were carried out and compared with the results of open pollination. Viable seeds were obtained from all combinations of pollination possibilities, suggesting these monoecious trees could be used as either male or female parent and were self-fertile. However, no individuals produced by selfpollination were found among the offspring from openpollinated, monoecious trees. The parentage of some of the crosses was verified using microsatellite markers. The germination energ'y (GE) and germination capacity (GC) were in most cases higher for seeds produced from controlled pollinations than from open pollination. Furthermore, GE and GC were both higher when pollen from the monoecious trees was used. An association between GE and GC rates on the one hand, and the pollination method and year it took place on the other, was found in most crosses made. This study extends knowledge of the reproductive biology of P. nigra that could be utilized in conservation genetic of this endangered allogamous species.
Silvae Genetica 01/2013; 62(3):117-124.
Silvae Genetica 01/2013; 62:18-26.
Dipterocarp trees are ecologically and commercially important in Southeast Asian tropical rainforests. For sustainable management of forest ecosystems and conservation of biodiversity, it is essential to establish plantation methods ensuring that genetic variation of the planted trees is equivalent to that in natural forests. The genetic diversity and differentiation of Shorea leprosula and Shorea parvifolia on plantations managed by a private-sector forestry company in Indonesia and those in natural populations were compared using microsatellite markers. Genetic diversity in the planted populations was as high as that in the natural populations. No clear genetic differences between each planted population and the natural forest populations were found. The genetic variation present in planted S. leprosula and S. parvifolia populations did not appear to deteriorate in the planting system implemented in Indonesia, known as Tebang Pilih Tanam Jalur (TPTJ). These results indicate that the current plantation method practiced in the region is suitable for maintaining the original genetic composition and achieving sustainable use of tropical rainforests.
Silvae Genetica 01/2013; 62(6):292-299.
Silvae Genetica 06/2012; 61(6):287-291.
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