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Articles by C.G. Ipsilandis
Total Records ( 13 ) for C.G. Ipsilandis
  B.N. Vafias and C.G. Ipsilandis
  Recombinant lines developed from combining Half-sib/S1 evaluation on widely-spaced plants in the direction of high yielding per se, were used in combining ability tests in order to determine gene action under three-way crossing and possible commercial exploitation of such crosses. Combining ability tests consisted of crosses between: a) recombinant lines of common pedigree, b) recombinant lines and freely available inbred lines and c) recombinant lines and commercial F1 maize hybrids (three-way crosses). Heterosis was found to be acceptable, since the best three-way crosses reached the performance of corresponding single-cross hybrids and yielding performance of these three-way crosses was stable across years and experimental fields. Rapid line development from combining Half-sib/S1 evaluation may ensure high and stable crossing performance, based on additive gene action. Stability and uniformity of performance of three-way crosses was due to proper breeding incorporated in single-cross hybrid and to high and stable inbred line performance.
  S.T. Kotzamanidis , N. Stavropoulos and C.G. Ipsilandis
  An extensive evaluation of 43 varieties from the Greek collection of groundnut was carried out during years 1986-90 in the farm of the Cotton and Industrial Plants Institute, Greece. A systematic characterization referred to eight botanical, morphological and agrophysiological traits included in the descriptor lists of IBPGR and ICRISAT, followed field evaluation. These traits were: growth habit, branching pattern, leaf colour, pod distance from the main root, synchronized pod maturity, days to emergence, days to 50% flowering and days to maturity. Principal Component Analysis (PCA) extracted two main factors representing 83% of the total variation. PC1 (interpreted as earliness factor) explained 68.4% and PC2 (interpreted as synchronized maturity factor) 14.6% of the total variance. Cluster analysis classified the assessed cultivars into distinct groups on the basis of earliness and synchronized pod maturity. The evaluation has shown that most of the Greek varieties botanically belong to the subspecies hypogaea and to Virginia type which is late material. Only a few varieties belong to the subspecies fastigiata and to Valencia or Spanish type and found to be an early genetic material. The evaluation also contributed in identifying certain varieties, such as Serraiki, Sakania Sindu and Poroia, as promising for their significant earliness, varieties Tragana, Ispaniki and Proimi Funtoti for high pod concentration and varieties Krestena, Karolina and Lakonia for highly synchronized pod maturity.
  C.G. Ipsilandis , I.S. Tokatlidis , B. Vafias and D. Stefanis
  Recycling of F1 maize hybrid Lorena was conducted in two breeding cycles. The breeding scheme was based on inbred line method for improving yielding performance of lines per se. The line development was based on a pedigree selection scheme with selfing and evaluation under favourable field conditions. Early evaluation included honeycomb designs and wide spacing. After two cycles of recycling, heterosis and heterobeltiosis level was found very low or negative and inbred line yielding performance per se was high reaching the original hybrid`s yield. This indicated excessive exploitation of favourable additive gene action, which leads to homozygote advantage. Final crosses were similar or sometimes better than original hybrid. Several criteria were used for the breeding procedure. The choice of starting material was based on inbreeding depression, general combining ability and specific combining ability estimation conducted previously. The breeding procedure was based on additive gene action. Breeding scheme was based on a new approach of the inbred line method on cross-fertilized species and the final target was focused on maximizing yielding performance and not heterosis. Evaluation during early stages was based in favourable experimental conditions, incorporating honeycomb field designs.
  B. Vafias , C.G. Ipsilandis , C. Goulas and P.N. Deligeorgidis
  The purpose of this study was to evaluate the yielding performance of F1 single maize hybrids and their mechanical mixture in three plant densities and in two different years. Experiments were conducted in the farm of TEI of Larissa in 2000 and 2001. The genetic material used was consisted of commercial and experimental F1 single-cross maize hybrids and their balanced mechanical mixture for each year. It was found that there was a tension for increasing field yields of almost all hybrids when the plant density was increasing. This was very clear for year 2000, but in 2001 this was found only for the middle density in comparison to the low density because of the presence of common smut. Only hybrid Dias was the exception, with decreasing field yield when the plant density was increasing. The increasing plant density resulted in increasing CV values and number of barren plants. The performance of the mechanical mixture of all hybrids was similar to the mean performance of the hybrids when grown separately. This kind of performance was rendered to the genetic background of modern hybrids, in a way that under stress conditions (allocompetition, density effects) they express stable performance. In general, modern commercial maize hybrids increase field yields under increasing plant density and they can be used as a mixture without decreasing yielding performance. It is possible that allocompetition is not a stronger stress factor than isocompetition in modern maize hybrids.
  B. Vafias , C. Goulas , G. Lolas , E. Tamoutsidis , P.N. Deligeorgidis and C.G. Ipsilandis
  Mass selection during early stages of genotype evaluation is essential for maize breeding programs. The purpose of this study was to determine the proper conditions for mass selecting useful genotypes in segregating maize genetic materials. F1/F2 comparisons were made to evaluate the genetic materials and F1/F2 and F2 mixtures of genotypes were formed to ensure allocompetition conditions. Moreover, two severe stresses were applied: plant density and low inputs, in addition to full-inputs conditions. Prisma F1 and F2 were better yielding materials than Funo F1 and F2, respectively. Until 13.33 plants m-2 there was an increase in F1 field yields, followed by lower yields in increased plant density, since modern hybrids tolerate greater plant populations. Significant interaction between genetic materials and plant density found in full-inputs experiments, was eliminated under the strong low-inputs stress. The indications from Half-sib progeny evaluation showed strong relationship between progeny yield and both selected plants’ yield and selection differential. High selection differential was realized under low-inputs condition due to low performance of original genetic materials. Strong allocompetition conditions may have a negative effect on HS progeny yielding performance, since mixtures of different genetic materials lead to lower yields. As a final conclusion, present findings indicated that selection of genotypes must be practiced under conditions of high selection differential. The original population mean is not as important as the selection differential. Extended experimentation must include S1 and Full-sib progenies and selection of progeny plants must include not only the highest yielding plants, but plants from the upper, mean and lower yielding areas of yield distribution, as well.
  P.N. Deligeorgidis , L. Giakalis , G. Sidiropoulos , M. Vaiopoulou , G. Kaltsoudas and C.G. Ipsilandis
  The biological cycle, the duration of preoviposition-oviposition-postoviposition periods, female adults` longevity, reproduction dynamic (eggs/female) and reproduction rate (eggs/female/day) of Frankliniella occidentalis (Pergande) and Thrips tabaci Lindeman (Thysanoptera: Thripidae) were studied on cucumber at 15, 20, 25 and 30°C. The biological cycle of F. occidentalis ranged from 33.99 days at 15°C to 11.99 days at 30°C, while that of T. tabaci ranged from 32.76 to 11.78 days at respective temperatures. The duration of each developmental stage for both thrips species was reduced with temperature increase. Total female longevity of F. occidentalis decreased when temperature increased from 15 to 30°C, while the longevity of T. tabaci was lower and also decreased from 15 to 30°C. For F. occidentalis the maximum reproduction dynamic and reproduction rate was found at 20°C and minimum at 15°C. For T. tabaci the maximum reproduction dynamic was also found at 20°C and the optimum reproduction rate at 25°C, but without statistically significant difference when compared to reproduction rate at 20°C. The minimum values of T. tabaci were also found at 15°C. Cucumber found to be a suitable host plant for survival and reproduction of both thrips species. Temperature may affect thrips population, especially when measurements our out of normal temperature range.
  P.N. Deligeorgidis , C.G. Ipsilandis , M. Vaiopoulou , N.P. Deligeorgidis , D. Petkou and E. Simopoulos
  During the present study, an evaluation of damage caused by Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) on cucumber leaves is given. The experiment took place in May 1999. For this purpose, 50 cucumber plants (Cucumis sativus L., F1 Kamaron) were used. The plants grew in small pots covered by plastic cages in a glasshouse. Plants with the first real leaf developed (approximately 14 cm2), were divided in Groups I-V, each consisting of 10 plants. On each plant of the first four Groups, 5, 15, 25 and 35 females of F. occidentalis were released respectively, while Group V was used as control. Plants remained covered by the plastic cages in the glasshouse throughout the experiment for 18 days. The number of thrips individuals placed on each plant remained stable during the study. Results showed that, the damage on cucumber leaves increases relatively with the number of thrips. The damaged leaf area was 1.02 cm2 at 5 thrips individuals, increasing at 7.81 cm2 at 35 thrips individuals. Photosynthetic capability was also reduced. The chlorophyll content estimation in SPAD units was almost intact when initial number of thrips was 5 individuals in comparison to the control, but readings of the instrument decreased rapidly in greater initial population.
  P.N. Deligeorgidis , C.G. Ipsilandis , M. Vaiopoulou , N.P. Deligeorgidis , D.G. Stavridis and G. Sidiropoulos
  The duration of life-cycle (egg-adult) and the longevity of the female adults (in days) of two thrips species, Frankliniella occidentalis (Pergande) and Thrips tabaci Lindeman (Thysanoptera: Thripidae) on cucumber and tomato plants were studied, under controlled conditions. Research indicated that, life-cycle of the two thrips species did not differed significantly between cucumber and tomato plants, while longevity of female adults of F. occidentalis is longer in comparison to T. tabaci in both plants examined and both species lived longer on cucumber plants in comparison to tomato plants. In mixed colonies of the two species, there were found significant differences in longevity of female adults, indicating that Frankliniella occidentalis may reduced longevity of Thrips tabaci in a kind of a competitive behavior and this was related to the host-plant and initial thrips population.
  P.N. Deligeorgidis , C.G. Ipsilandis , G. Kaltsoudas , L. Giakalis , D. Petkou and N.P. Deligeorgidis
  The damage on cucumber (Cucumis sativus L., F1 Kamaron) production caused by Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) was estimated in a glass greenhouse during the year 1999. Thirty two cucumber plants were separated in four groups; each group consisted of eight plants, which per two were covered with large cages made of muslin. 0, 5, 20 and 35 female adults of F.occidentalis were released correspondingly on every plant of these four groups. The thrips were released and grew up freely. The results of this research showed that, as the population of the thrips increased, it was observed an important decrease in the number of cucumbers per plant, the cucumber length, the cucumber mean weight and the total production per plant (kg). Initial thrips number consisted from one-day old adult females, resulted in linear correlated damages to all the production parameters studied.
  P.N. Deligeorgidis , C.G. Ipsilandis , G. Kaltsoudas , G. Sidiropoulos , N.P. Deligeorgidis , M. Vaiopoulou and A. Vardiabasis
  he present study was conducted in Voion county in the region of Kozani, in tobacco fields, involving population monitoring for two years (2004 and 2005), for three insects: Thrips tabaci, Epitrix hirtipennis and Myzus persicae. Two combined insecticides were applied: Tamaron 600SL (methamidophos) and Confidor 200SL (imidachloprid) and a check field (without application) was used. Sampling was conducted at seven periods, with 85 main samples consisted of three plants. Insecticide application reduced insect population about 70-74% and especially thrips population (up to 78%), resulting in double field yield performance of tobacco in comparison to check fields (no application). In the second year, there was a reduction of initial insect population, maybe due to previous effective application of insecticides and environmental conditions. There was a considerable interaction between insecticide application, insect species and sampling period, indicating different effectiveness of insecticides on insect species and differences in seasonal population fluctuation (due to different biological cycles of the insects during the cultivation period). Differences between years were found, indicating different environmental conditions. In general, there were greater populations of thrips or green aphids than flea beetles (about 30%). Second insecticide application was not only indispensable, but also lead to increased efficiency of insecticides. Finally, different environmental conditions, including transplanting period, may affect uniformity of insecticide application in the tobacco fields.
  P.N. Deligeorgidis , C.G. Ipsilandis , C. Fotiadou , G. Kaltsoudas , L. Giakalis and A. Garsen
  The seasonal fluctuation and distribution of Frankliniella occidentalis (Pergande) and Thrips tabaci Lindeman populations in various developmental stages (larvae I, II and adults) was studied in two crops: cucumber (Cucumis sativus L., F1 Kamaron) and tomato (Lycopersicon esculentum M., F1 Arletta) during April-August 2000. Samples of leaves and flowers were collected from the upper and lower half part of the plants. The population peak of F. occidentalis and T. tabaci in cucumber and tomato crops was observed between 20/5/2000 and 30/5/2000. The distribution data for both Thrips species showed that they prefer cucumber to tomato. Both Thrips species prefer leaves than flowers and the upper half than the lower half part of the plants. Additional laboratory research was conducted to determine the predatory effect of Coccinella septempunctata on both Thrips species. According to number of thrips found on cucumber and tomato leaves, the predatory effect of the ladybird was also determined indicating that, when pest density is high, then predation may be ineffective.
  S.T. Kotzamanidis , N. Stavropoulos and C.G. Ipsilandis
  Forty-three cultivars from the Greek collection of groundnut were characterized and evaluated for various agronomic and quality traits and resistance to waterlogging, during 1986-90 in the farm of the Cotton and Industrial Plants Institute. Seventeen morphological and physiological traits included in the descriptor lists of IBPGR and ICRISAT were used in total. Principal Component Analysis (PCA) extracted 5 factors representing 77.3% of the total variation. PC1 explained 35.6, PC2 14.2, PC3 13.0, PC4 8.4 and PC5 6.1% of the total variance. Cluster analysis classified the assessed cultivars into distinct cultivar-groups on the basis of pod and seed characteristics. The evaluation showed that most Greek Arachis cultivars belong to subspecies hypogaea, group Virginia. Only a few belong to subspecies fastigiata groups Valencia or Spanish. The experimental work succeeded in preliminary identification of certain cultivars with promising tolerance to waterlogging at harvest which are to be used either directly in the Arachis production zone in Northern Greece, or as breeding materials for the improvement of the species.
  S.T. Kotzamanidis , N. Stavropoulos and C.G. Ipsilandis
  Correlation between twenty-one traits was studied in plants of F2 generation derived from crosses of groundnut varieties. Also, correlation for the same traits of plants was studied within the four types of crosses used: Virginia × Virginia, Valencia × Valencia, Virginia × Spanish and Virginia × Valencia. Significant positive correlation have been found in the total of plants with r values ranging from 0.22 to 0.46 for pod yield with pod distance from the main root, seed length, seed width, pod length, pod width, grams/100 pod, grams/100 seed, shelling percentage. From the four types of crosses and for the same traits, in relation to the pod yield, the type cross Virginia × Virginia showed the most significant positive correlations followed by types Valencia × Valencia, Virginia × Valencia and Virginia × Spanish. Selection based on plants that have shorter pod distance from the main root and larger seed size and also larger 100 pod weight, could increase peanut yielding performance.
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