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Articles by Ioan HAS
Total Records ( 9 ) for Ioan HAS
  Voichita HAS , Alin GULEA , Ioan HAS and Ana COPANDEAN
  The objective of this research was to determine whether phenotypic and genetic diversity could be identified for maize grain quality traits (percentage of starch, protein, oil, fiber and ash) and agronomic traits. 59 maize synthetic populations which differed in earliness and for geographic origins were evaluated in the field at the Agricultural Research Station Turda - Romania, for their per se value. Each synthetic population was tested only one year and was characterized for their ear characteristics and grain quality attributes. The grain oil and ash content showed high variability among genotypes. The experiment was conducted over 2 years (2006-2007) and 2 locations (Turda and Targu-Mures). Analysis of variance showed significant differences among the genotypes for all traits studied. General combining ability (GCA) effects were more important for grain content than specific combining ability (SCA). The occurrence of low interactions between synthetic populations and testers for all characters suggested the occurrence of high statistical additive effects expressed whatever the system of population evaluation. These results support breeding effort towards the genetic improvement of grain quality traits in “Turda” maize germplasm.
  Rodica POP , Doru PAMFIL , Monica HARTA , Ioan HAS and Iulia POP
  Genetic analysis with RAPD markers has been extensively used to determine diversity among maize genotypes. The aim of the present study was to estimate genetic relationships among 70 genotypes, provided from SCDA Turda Cluj germplasm collection. RAPD analysis was performed with 14 decamer primers. These primers generated, among the studied genotypes, a number of polymorphic bands comprised between 13 bands (OPA 04) and 7 bands (OPAL 20). The highest numbers of polymorphic bands were obtained with primer OPA 04, respectively 13 bands, following by OPO 12 (12 polymorphic bands), OPAB 11 and OPA 17 (11 polymorphic bands). Lowest number was obtained with primer OPAL 20, respectively 7 polymorphic bands. Genetic distances were established using Nei-Li coefficient and UPGMA dendrogram was constructed with RAPDistance 1.04 software. The built dendrogram shows phylogenetic relationships between genotypes analyzed.
  Voichita HAS , Rodica POP , Ioan HAS and Ana COPANDEAN
  Characterization of genetic variability among maize inbred lines can facilitate organization of germplasm and improve efficiency of breeding programs. A set of 83 phenotypically diverse inbred maize lines maintained in Agricultural Research and Development Station (ARDS), Turda, Romania was characterized by pedigree, phenotypically using 14 characters of the plant and ear and genetic with RFLP markers. The objective of this study was to characterize the genetic variability and to define the potential heterotic groups based on clusters formed with marker data. Inbred lines were grouped by their phenotypic differences index in twenty classes. Both the phenotypic and molecular markers analysis indicated high genetic variability and also allowed the separation of the germplasm into group of genetic similarity. The result suggested that the inbred lines analyzed could be useful in maize genetic breeding program.
  Rodica POP , Ioan HAS , Iulia Francesca POP , Monica HARTA and Doru PAMFIL
  Knowledge of genetic diversity and relationships among maize inbred lines is indispensable to a breeding program. Our objective was to investigate the level of genetic diversity among maize inbred lines. Eighty-three maize inbred lines obtained from SCDA Turda were genotyped using 20 decamer primers. These primers generated, among the studied genotypes, a number of polymorphic bands comprised between 17 bands (OPA 03) and 7 bands (OPAB 11). The highest numbers of polymorphic bands were obtained with primer OPA 03, respectively 17 bands, followed by OPA 01, OPB 08 (16 polymorphic bands) and OPX 03 and OPAL 20 (13 polymorphic bands). Genetic distances were established using Nei Li/Dice coefficent and an UPGMA dendrogram was constructed with FreeTree software. The built dendrogram shows phylogenetic relationships between the analysed biological material.
  Cornelia STAN , Ioan HAS , Voichita HAS , Ana COPANDEAN and Nicolae TRITEAN
  Root system development in maize seedlings has a influence on the further development of the plant; also length of mesocotyl and depth of coleoptile influence which can sow corn, play an important role in the uniformity of culture and plant growth and development. The area in witch has been created corn genotype, soil type and climate, but also some elements of technology have influenced the development of root system, the length of mesocotyl and coleoptile of the young plantlet. The paper presents variability in root system development of 40 inbred lines of corn , coleoptile and mesocotyl development in the same set of inbred lines and correlations between these characters.
  Felicia CHETAN , Ioan HAS , Dana MALSCHI , Valeria DEAC , Mircea IGNEA , Alina SIMON and Adina IVAS
  Currently, conservative work, defining a wide variety of processes, (Gus, et al.,2008); between traditional or conventional farming system and the agriculture conservative system (no tillage) the intervention on the ground is minimal, there are plenty of tillage methods, specific to certain working conditions, equipment machinery or even tradition. Designed and conducted compared experiment to ARDS Turda, includes two ways to work the soil, a conventional classical (with plowing, soil preparation and planting) in parallel with the conservative system (“no tillage”), in a 3-year rotation with: wheat - soy - maize with experimental versions that include technological measures that help to control the plant vegetation of experiment, namely: fertilization (two graduations) and treatments (four graduations applied in four specific phenophase, after a sketch by 4,3 and 2 treatments with various combinations of pesticides). Complex treatments are absolutely necessary given that the only way to control diseases, weeds and pests. From this perspective the system is only applied to new elements of sustainable agriculture (Carlier et al. 2006). It was cultivated wheat variety Arieşan (created in ARDS Turda). Results in complex experiment shows that in ARDS Turda conditions in normal years in terms of climate on winter wheat grown in conservation agriculture system can achieve higher yields than conventional farming system; but when problems occur related to climate (heat, lack of precipitation) conventional farming system proved superior. In the three experimental years, in average, both the classic and conservative farming system in fertilization supplementation with N50P30 led to production increases 16.9% in the classical and 11.5% in the conservative farming system, the differences being statistically significant, in average on across the experimental system was realized an increase of production of 342 kg / ha, but between treatments applied were not recorded.
  Nicolae LUPU , Vasile MOLDOVAN , Rozalia KADAR , Ioan HAS and Ionut RACZ
  Pre-harvest sprouting process in winter wheat can be considered as a complex quantitative trait because it is the result of some morpho-physiological characters among dormancy duration and alpha-amylase activity, are essential. The objectives of this study consist of two main aspects:evaluation of dormancy duration in F1 hybrids in comparison to parents. determination of gene effects involved in inheritance of pre-harvest sprouting and falling number in winter wheat.
  Ionut RACZ , Marcel DUDA , Rozalia KADAR , Vasile MOLDOVAN , Ioan HAS and Nicolae LUPU
  Romania, almost the entire territory meets the favorable conditions for winter wheat crop, but in recent years due to problems with crop establishment in autumn, is still remain a growing area that would be available for spring crops. Another consideration for the spring wheat area of land would earn would be that in our country there are mountain areas at high altitudes, with unfavorable conditions for winter wheat crop, where winters exceed 4-5 months yearly, or dry climates with harsh winters without snow cover. It is known that spring wheat yielded less than winter wheat, after our previous studies about 20-30% smaller production and it is due to the shorter period of vegetation, about 120 days, compared with winter wheat which has 265 days. Areas occupied by spring wheat in our country are small.
  Cornelia STAN , Ioan HAS , Voichita HAS , Nicolae TRITEAN and Ana COPANDEAN
  One of the most important and difficult steps in the production of seed corn is drying and conditioning it, especially when seed production is done in ecological areas with limited temperature.
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