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Articles by Ana COPANDEAN
Total Records ( 6 ) for Ana COPANDEAN
  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.
  Use of differentiation between parental forms in released maize hybrids, hybrid combinations can be achieved providing a more intense expression of heterosis, which in addition has a high production capacity and increased adaptability, as a result of the genetic basis of the parents is wider and often complementary. The method of creating hybrids between inbred lines after (GALLAIS (1990) is a faster and convenient mean of accumulation of favorable dominant genes, for obtaining a high degree of homogenety and a certain homeostasis. Phenotypic and genetic diversity of maize inbred lines was particularly necessary in the creation of hybrids, is the foundation of the phenomenon of heterosis, the main way to prevent genetic vulnerability, thereby obtaining hybrid combinations preferred by farmers or by seed producers. This paper presents estimates diversity parental forms, heterosis, the relationship between diversity and heterosis in three way crosses (TWC): Turda Mold 188; Turda 165; Turda 145; Turda Star and a single cross (SC) Turda Favorit. To this end, parental lines were analyzed in male and female parental forms for TWC, stablishing phenotypic differentiation index (IDF) based on characters of parental lines, heterosis realized at single crosses (reproductive, somatic, adaptive and metabolic) after Hallauer and Miranda (1981). It has been calculated the correlation coefficient between phenotypic diversity index (IDF %) and heterosis (H%). The obtained results lead us to believe that the most effective discrimination diversity of inbred lines can be achieved simultaneously taking into account both quantitative indicators of diversity.
  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.
  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.
  The evaluation of the genetic diversity in maize inbred lines has significant implications on maize breeding, both in the process of creating inbred lines and in the strategy of creating wellperforming hybrid formulae, starting from the general concept of parental-form diversity. Field experimentation was the first to supply the information concerning the relation between the indices of phenotypic and genetic diversity of maize inbred lines. This was followed by the phenotypic analysis (IDF) depending on the averages of the parental-form features; then the genetic analysis: (IDg + Σsmn) the index of diversity of the additive effects plus the sum of the non-additive effects, and on a molecular level scanning the densitograms and conducting a qualitative evaluation: the difference in the number of zeinic fractions (DNF); the difference of the molecular areas (DAM) and an index of resemblance on a molecular level, represented by √(ΣDAM)2. The results confirm the statement that the most effective discrimination of the inbredline diversity is achievable by their classification in comparison with an indicating line of a heterotic group, taking into account two quantitative indicators of diversity at a time (Hr%, IDF and IDg + Σsmn) and analyzing the genotype dispersion in relation to the specific regression line. The correlation between the quantitative indicators of molecular differentiation and the expression of the heterosis highlighted the possible significant negative correlation, whereas the correlation between these indicators and other phenotypic and genetic-diversity indicators generated insignificant results.
  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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