Összesen 3 találat.


001-es BibID:BIBFORM064222
Első szerző:Molnár V. Attila (biológus, botanikus)
Cím:Seed of the threatened annual legume, Astragalus contortuplicatus, can survive over 130 years of dry storage / Attila Molnár V., Judit Sonkoly, Ádám Lovas-Kiss, Réka Fekete, Attila Takács, Lajos Somlyay, Péter Török
Megjegyzések:Long-term seed viability is of crucial importance for short-lived species, since persistent seed banks can buffer the fluctuations in the establishment of plants from year to year. Temporarily flooded habitats are an unpredictable environment for plants, and for some species the only chance they have of surviving is the formation of persistent seed banks. Astragalus contortuplicatus is an annual species of periodically flooded habitats and is considered an endangered species in Hungary. Altogether 1993 seeds of this species were tested in a germination experiment: 1200 were freshly harvested and 793 were collected from herbarium specimens of various ages. Seed viability was tested using the germination method. The freshly harvested seeds were used for selecting the best out of seven frequently used dormancy-breaking methods for this species. The highest percentage of germination was recorded for the combined treatment of scarification and light. Thus, this method was used to test the viability of the seeds collected from herbarium specimens. The oldest seeds that germinated were 131 years old. Until now there are no records of seeds of herbaceous legumes germinating that are more than 100 years old. This record is the 9th oldest of all the literature records of viable seeds originating from biological collections. All the seeds that germinated developed into healthy, fertile plants, the seeds of which also readily germinated. Fitted linear regression showed a significant negative relationship between seed age and percentage germination. Based on this linear regression the calculated theoretical maximum viability is 309 years. Our results suggest that seeds of A. contortuplicatus stored in collections can be successfully used in this species' reintroduction for conservation purpose, to areas in which the plants were collected.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
biological collections
hard seeds
physical dormancy
seed longevity
seed storage
Megjelenés:Preslia. - 87 : 3 (2015), p. 319-328. -
További szerzők:Sonkoly Judit (1989-) (biológus) Lovas-Kiss Ádám (1991-) (biológus, botanikus) Fekete Réka (1993-) (biológus) Takács Attila (1989-) (biológus, botanikus) Somlyay Lajos Török Péter (1979-) (biológus-ökológus)
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001-es BibID:BIBFORM099297
Első szerző:Takács Attila (biológus, botanikus)
Cím:Evidence of hybridization between Galatella villosa and G. linosyris, and a taxonomic reappraisal of the hybrid G. xsubvillosa / Takács A., Zsólyomi T., Molnár V. A., Jordán S., Sennikov A. N., Vincze O., Sramkó G.
Megjegyzések:At the westernmost distribution of the steppe herbaceous plant, Galatella villosa, in Hungary, Serbia and Ukraine, we recently observed intermediate specimens between this species and its close relative, G. linosyris. We were able to demonstrate the hybrid origin of these individuals by sequencing the biparentally inherited nuclear ribosomal internal transcribed spacer (nrITS) region and checking additive polymorphism in the hybrids. In addition, examination of the maternally inherited plastid regions (trnH-psbA and trnL-trnF intergenic spacers) revealed that G. villosa is likely to be the maternal parent in the Hungarian and Ukrainian populations and G. linosyris in the Serbian population. The intermediate forms produced only sterile seeds. The alleged hybrid between the above two species has already been described as G. ?subvillosa based on a very brief diagnosis. Still, the analysis of the morphological characters using linear discriminant analyses clearly separated the holotype of G. ?subvillosa from individuals of G. linosyris ? G. villosa. The latter appeared to be morphologically intermediate between populations of G. villosa and G. linosyris. Contrary to the originally stated hybrid origin of the type plants of G. ?subvillosa, morphological evidence indicates the involvement of G. divaricata not G. linosyris. The hybrid G. linosyris ? G. villosa is thus described here, as a new nothospecies G. ?feketegaborii. This study highlights the power of easily available molecular phylogenetic tools for demonstrating the hybrid origin of plants and illustrates how additive polymorphism can be distinguished from other types of intraindividual polymorphism in nuclear DNA sequences.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
additive polymorphic site (APS)
bidirectional hybridization
Compositae; hybrid sterility
multivariate morphometrics
Megjelenés:Preslia. - 92 : 4 (2020), p. 375-390. -
További szerzők:Zsólyomi Tamás Molnár V. Attila (1969-) (biológus, botanikus) Jordán Sándor (1992-) Sennikov, Alexander N. Vincze Orsolya (1988-) (biológus) Sramkó Gábor (1981-) (biológus)
Pályázati támogatás:K108992
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Intézményi repozitóriumban (DEA) tárolt változat


001-es BibID:BIBFORM047882
Első szerző:Takács Attila (biológus, botanikus)
Cím:Key environmental variables affecting the distribution of Elatine hungarica in the Pannonian Basin / Attila Takács, András Schmotzer, Gusztáv Jakab, Tamás Deli, Attila Mesterházy, Gergely Király, Balázs András Lukács, Boglárka Balázs, Ranko Perić, Pavol Eliáš jun., Gábor Sramkó, Jácint Tökölyi, Attila Molnár V.
Megjegyzések:Elatina hungarica Moesz is a small wetland ephemerophyte that occurs and is classified as extinct, data deficient or a very rare and endangered taxon in most countries in eastern and central Europe. Based on literature and herbarium data, supplemented by 160 field records collected between 1998 and 2011, we present the currently known distribution of this species in the Pannonian Basin, which mostly but not exclusively includes Hungary. Within the Pannonian Basin this species is distributed throughout Hungary, with sporadic occurences in Romania, Sebia and Slovakia. The temporal distribution of floristic records is very uneven. This species was recorded only in 27 years during the last 213 years (1798-2011). When examining presence/absence data for most of the 20th century, we found a significant correlation between the number of records of this species in a given year and two key, but not independent, environmental variables: rainfall and the extent of the area inundated in the same year. In the more intensively documented period between 1998 and 2010, there is only a significant correelation between the numbers of records of this species and the extent of flooding, which is because there is a delay in the effect of an increase in rainfall. The peak occurence of records in the 1940s and 1950s is associated with extensive rice production in Hungary. Today, most records are for agricultural fields that are subject to flooding and becoming temporary wetlands. The comparison of recent and past distributions of E. hungarica reveals a consistent and marked regional difference; whereas this species is not rare along the Tisza river and its tributaries, it is markedly scattered in similar habitats near the Danube.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
rice weeds
temporary ponds
Megjelenés:Preslia. - 85 (2013), p. 193-207. -
További szerzők:Schmotzer András Jakab Gusztáv (1975- ) (paleontológus) Deli Tamás Mesterházy Attila Király Gergely Lukács Balázs András (1979-) (ökológus) Balázs Boglárka (1985-) (geográfus) Perić, Ranko Eliáš, Pavol (jun.) Sramkó Gábor (1981-) (biológus) Tökölyi Jácint (1984-) (biológus) Molnár V. Attila (1969-) (biológus, botanikus)
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
Szerző által megadott URL
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