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Search Results: 1 - 10 of 119411 matches for " Attila T. SZABO "
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Floristical data (I)
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1970,
Abstract: The paper presents floristical data referring to 30 species, 36 infraspecific units respectively, which are new for the studied territories; among this 6 new units for the country and 7 new units for the science. Gives evidence for the validity of Carex michelii Host f. gynobasea, described by Florian Porcius in 1878 from adjacent territories.
Microevolution in Trifolium L. Sect. Stenostoma M. B. I. biometry of spontaneous and cultivated Trifolium pannonicum Jacq.
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1987,
Abstract: The variability of spontaneous and cultivated (selected) Trifolium pannonicum Jacq. (2n=16x - 22x) has been studied by using herbal specimens, samples collected from spontaneous populations, cultivated ones and selected elite plants. The biometry of economically and/or taxonomically important characters have been performed, results tabulated and statistical indicators - mean, standard deviation, coefficient of variation - calculated. These values indicate differences between the eastern and western accessions with regard to peduncle length, petiole length, leaf size, hairiness etc. Based on these differences a new taxon var. moldavicum var. nova has been proposed. Cultivation revealed that the diploid T. ochroleucon Huds. is a short living plant (1-2 years), but polyploid T. pannonicum persisted up to 10 years or more. Natural selection for disease resistance and persistence did not narrowed sharply the variability of the selected elites. In elite plants the coefficient of variability was especially high for underground organs (number of lateral roots, root noduls for unit root length etc.), characters positively correlated with yield components. Problems relating to taxonomy, evolution, domestication and use of the species are also briefly discussed.
Chorology and phytocenological integration of Adonis volgensis in R. S. Romania
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1973,
Abstract: In continuation of former cytological studies (1972) the paper presents phytochronological and phytocenological data regarding Adonis volgensis Stev. and A. hybrida Wolff from Romania, with special reference on an isolated point of the disjunct distribution of the species (Transylvania, Cluj, finatele Clujului, Fig. 1. D.III.22.; Fig. 2. D.III.22 12-13 and 22-23). At this point, on a restricted territory of about 1000 m2, a small population of A.volgensis can be found, which presents complex microevolutive phenomena as a result of introgresiv hybridization with a vastly out numbering population of A. vernalis L. The habitat of the species is steadily endangerd by herborizers and by rapid extansion of the city of Cluj. For the chorological representation of data the mapping system elaborated by A. Nyarady and E. C. Vicol (1973) have been applied, for the phytocenological processing the principles and symbolization of Central-European phytocenological school have been followed.
Observations regarding the spreading and variability of Microrrhinum species in Romania
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1983,
Abstract: In accordance with the results of SPETA (1980) the nomenclatural position of Microrrhinum (Chaenorhinum) populations collected from Romania are discussed. As the differentiation between the North, South and Central European populations is reflected in scatter diagram, the nomenclatural distinction of these populations seems also acceptable. True Microrrhinum minus L. Pourr. Was not collected in Romania; the majority of populations collected here belong to Microrrhinum praetermissum (Delastre) Speta 1980, southern populations belong to M. janchenii Speta 1980, and true M. litorale (Bernh. Ex Willd.) Speta 1977 is represented in our collections only from Yugoslavia. Some possible evolutionary reasons of the variation are briefly discussed.
Genetic resources in the cultivated flora of the Apuseni Mountains
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1982,
Abstract: In order to detect genetic resources formed during specific relations between plant life and human activity in a sample territory situated in the North-Eastern border of the Apuseni Mountains (Transylvania, Romania) 416 cultivated plant species were identified and reliable ethnobotanical material was collected. The influence of different geographical regions of the world on the flora of the territory was characterized by an influence index. The influence index "I" of the American, African and Australian species on the spontaneous flora of the sample territory was very low, (I1 = 2,01), but on the cultivated flora it was very high (I2 = 58,48), reflecting the strong impact of foreign floras and agricultures. The cultivated flora of the territory was characterized according to following descriptors: geographical origin, life form, main traditional usage, main place of cultivation, frequency of cultivation, degree of domestication, ethnobotanical knowledge related to different species, local variability, territorial dynamics (related to genetic erosion or sedimentation) and territorial distribution.
Wheatgrass variability (Agropyron, sect. Elytrigia) in a native collection from Transylvania. II. Agropyron repens
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1979,
Abstract: In continuation of former studies regarding wheatgrass variability (Agropyron Gaertn. Sect. Elytrigia) carried out on 89 different populations collected along a transect in Transylvania (Not. Bot. Hort. Agrobot. Cluj,1979, X. 89-99) results regarding 31 A. repens (L.) P. Beauv populations are presented in this paper. Average values per population for open pollination fertility (OPF) varied betweeen 0.0-40.0%; spike length: 59-196 mm; spikelet length: 8.8-17.0 mm; number of caryopses per spike: 0.0-40 etc. The results may contribute to the explanation of some microevolutionary processes and differential spreading patterns found in Elytrigia section.
Wheatgrass variability (Agropyron, sect. Elytrigia) in a native collection from Transylvania. II. Agropyron repens (L.) P. Beauv
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1981,
Abstract: In continuation of former studies regarding wheatgrass variability (Agropyron Gaertn. Sect. Elytrigia) carried out on 89 different populations collected along a transect in Transylvania (Not. Bot. Hort. Agrobot. Cluj,1979, X. 89-99) results regarding 31 A. repens (L.) P. Beauv populations are presented in this paper. Average values per population for open pollination fertility (OPF) varied betweeen 0.0-40.0%; spike length: 59-196 mm; spikelet length: 8.8-17.0 mm; number of caryopses per spike: 0.0-40 etc. The results may contribute to the explanation of some microevolutionary processes and differential spreading patterns found in Elytrigia section.
Data concerning phenotypical plasticity (size and shape of leaf) in Ranunculus sect. auricomus
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1975,
Abstract: This paper is dealing only with the first item of general significance in order to demonstrate, that with these plants, adapted mainly to more humid forest and meadow habitats, certain morphological modifications take place during the individual life which - based probably on autoregulatory dependent morphogenesis - may be correlated with certain climatic differences (temperature, soil humidity) in the subsequent years, with the age of plants and with heteroblastic development. Our observations may be put in connection with the temperature dependent leaf morphogenesis and phenotypical plasticity of the amphibious species of of Ranunculus.
Regional variability in Phaseolus vulgaris L. (II.) Seed character frequencies in Transylvania
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1985,
Abstract: Attempt was made to evaluate gene frequencies using seed characters registred in Phaseolus vulgaris, cultivated in traditional multicropping (Zea + Phaseolus + Cucurbita) in a sample territory in Transylvania (Romania). The highest frequencies were found in the case of characters determined mostly by I, T, D, and at gene group (according to Prakken 1972); mottled seed coat and violet colour was relatively rare. The short and spherical forms are more frequent, as the long and compressed, with the notable exception of white compressed types. Our knowledge in Phaseolus genetics allowed only a first approach in a very restricted number of characters.
V-leaf marking in a Trifolium ambiguum Bieb. germplasm collection
Attila T. SZABO
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1987,
Abstract: Frequency values have been registered in the neomorph multiple allele series of V-leaf marking in a germplasm collection of Caucasian (Kura) clover - Trifolium ambiguum Bieb. This collection, obtained from the Northwest Reg. Plant Instr. Stn., Geneva N.Y., USA, comprises 60 accessions from USSR, Australia, Iran and Turkey. Allele frequencies have been registered by phenotype analysis of leaflet samples collected with modified double meter method (PUIA et al. 1978). Neomorph alleles have been noted following BREWBAKER. The Vh type neomorph was the most common (48% in average for the whole collection), followed by Vo (35,8%), VH (7,7%), Vb and VB (4,5 and 0,2%). Some of the accessions differed markedly in V-leaf mark frequencies: VO was completely lacking in two accessions (0%) but was common in other two (75%). Clinal variation, along altitudinal gradient, was also detectable. The majority of accessions were oligomorph, with just 2-3 V-leaf mark phenotypes per accession.
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