Despo K. Papakosta

Aristotle University of Thessaloniki

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Spyridon D. Koutroubas

Democritus University of Thrace

J. T. Tsialtas

Aristotle University of Thessaloniki

Alexandros Doitsinis

National Agricultural Research Foundation

N. Maslaris

Hellenic Petroleum (Greece)

D. S. Veresoglou

Aristotle University of Thessaloniki

A. Gagianas

Aristotle University of Thessaloniki

N.A. Karaivazoglou

Aristotle University of Thessaloniki

Antonios N. Papantoniou

Aristotle University of Thessaloniki

J.C.W. Odongo

National Agricultural Research Organisation

C. Tzialla

National Agricultural Research Foundation

Cooperative Institutions

National and Kapodistrian University of Athens

Aristotle University of Thessaloniki

Sotiria General Hospital

University General Hospital Attikon

National Agricultural Research Foundation

University Hospital of Larissa

Sismanoglio General Hospital

University of Ioannina

Democritus University of Thrace

University of Thessaly

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Genotypic response to re-growth of defoliated sugar beets after re-watering in a water-limited environment: effects on yield and quality

International Journal of Plant Production (2009)

J. T. Tsialtas E. Soulioti N. Maslaris Despo K. Papakosta

Growing season

10.22069/ijpp.2012.637

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Citations (10)

Effect of Inoculant Rate on Nodulation and Various Agronomic Traits of Soybean

Journal of Agronomy and Crop Science (1992)

Despo K. Papakosta

Abstract In a soil lacking indigenous Bradyrhizobium japonicum , soybean ( Glycine max [L.] Merr.) nodulation depends upon the number of rhizobia applied with the inoculum. This field study reports the effect of different rates of applied rhizobia on nodulation, dry matter and nitrogen content in soybean in a Mediterranean soil lacking B. japonicum. Treatments included six rates of B. japonicum , ranging from 2.5 × 10 4 to 6.075 × 10 6 rhizobia cells per seed applied to the seed as peat inoculant at planting, 100 kg N ha −1 and an uninoculated control. The experiment was conducted in an Entisol soil. Regression analysis showed linear relationship between the rate of applied rhizobia and the number of the nodules per plant or the dry weight per nodule. In early stages of development (32 and 68 days after planting) plant dry weight was not affected by inoculation rate. At harvest a rate of 7.5 × 10 4 rhizobia cells per seed was necessary for maximum total and stover dry weight. A higher rate, 6.75 × 10 5 rhizobia cells per seed, was required to obtain maximum grain yield, total N content in plant tops and grain N content. Grain percentage N was increased up to 2.025 × 10 6 rhizobia cells per seed. Nitrogen application increased grain yield, total N content and grain N content at the same level as the lower inoculation rate.

Bradyrhizobium japonicum

Dry weight

Bradyrhizobium

10.1111/j.1439-037x.1992.tb01004.x

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Citations (9)

Phosphorus Accumulation and Translocation in Wheat as Affected by Cultivar and Nitrogen Fertilization

Journal of Agronomy and Crop Science (1994)

Despo K. Papakosta

Abstract To improve nutrient management strategies in wheat more information is needed about the interaction effects among nutrients in their uptake and redistribution in the plants, in relation to different genotypes. Therefore, two bread ( T. aestivum L.) and two durum ( T. durum Desf.) winter wheat cultivars were grown in the field for 2 years (1986, 1987) in a silty‐clay soil under different nitrogen (N) levels, in Northern Greece. Nitrogen at a rate of 150 kg ha −1 was applied before planting or 100 kg ha −1 before planting and then 50 kg ha −1 at early boot stage. Cultivar differences in phosphorus (p) concentration were observed only in vegetative parts but not in the grain. Maximum p accumulation was observed either at anthesis or at maturity. During grain filling dry matter and p accumulation in the grain followed almost the same pattern. Phosphorus translocation efficiency of the cultivars at the 2 years ranged from 70.7 to 84.3 % and the amount of p in the grain derived from translocation 52 to 100 %. Phosphorus translocation efficiency was weakly correlated with p content in grain only in 1986, while phosphorus harvest index (PHI) was positively correlated with harvest indst (HI) both years (r = 0.82** in 1986 and 0.75** in 1987). Nitrogen application mainly affected p accumulation of the cultivars via its effect on biomass production. The split N application promoted slightly the p uptake in 1987 and this resulted in the reduction of both the contribution of the translocated p to the grain and the efficiency of p utilization for total biomass. Results indicated that p accumulation and translocation and the efficiency of p utilization in wheat were mainly determined by the genotype in relation to environmental condition of growth.

Anthesis

10.1111/j.1439-037x.1994.tb00563.x

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Citations (32)

Determinants of yield and quality in winter rapeseed (Brassica napus L.) under Mediterranean conditions

The Journal of Agricultural Science (2017)

J. T. Tsialtas Antonios N. Papantoniou Dimitrios Baxevanos I. Papadopoulos N.A. Karaivazoglou

SUMMARY Winter rapeseed was introduced into Greece a decade ago to provide oil for biodiesel. To identify agronomic traits affecting yield and quality, three hybrids and an inbred line were tested over two seasons (2005–2006 and 2006–2007) and four locations, in central and northern Greece, varying in pedo-climatic conditions. The large variations in seed yield, quality and agronomic traits were largely ascribed to location; in contrast, cultivar accounted for ⩽0·010 of the variation for many traits. Below 40°N, rapeseed is a risky crop; short season, high temperatures and low rainfall during reproductive growth diminished seed yield and oil content, increased oleic and erucic acid and minimized linolenic acid. A hybrid, Exact, with tall stature and large seeds was adaptive to such conditions. The most productive location had dense stands with tall plants bearing numerous pods on the main raceme. At the site with the coldest winter, plant density (PD) was lowest (ca. 30 plants/m 2 ) but rapeseed compensated by producing large seeds, with high oil content and harvest index (HI). A biplot revealed that the hybrid Excalibur, outperforming the other cultivars for oil content in six out of eight trials, produced the highest and most stable oil yield. Combined data showed that seed yield and oil yield were positively correlated with PD, seed size and HI and negatively to the number of pods on branches and per plant. Large seeds had high seed oil content. Oleic acid was negatively correlated to linolenic acid concentration. High temperatures and low rainfall favoured oleic acid, which was positively associated with seed number per pod.

Raceme

Biplot

Erucic acid

Growing season

Linolenic acid

10.1017/s0021859617000727

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Citations (7)

EFFECT OF DEFOLIATION ON LEAF PHYSIOLOGY OF SUGAR BEET CULTIVARS SUBJECTED TO WATER STRESS AND RE-WATERING

International Journal of Plant Production (2012)

J. T. Tsialtas E. Soulioti N. Maslaris Despo K. Papakosta

Stomatal Conductance

Water Use Efficiency

Plant Physiology

10.22069/ijpp.2012.733

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Citations (7)

Α1-ANTITRYPSIN DEFICIENCY IN GREEKS: FOCUS ON RARE VARIANTS

CHEST Journal (2022)

E. Manali Marina Veith Andrianna I. Papaioannou Vicky Apollonatou Ilaria Ferrarotti

10.1016/j.chest.2021.12.326

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Citations (0)

Root rot diseases of sugarbeet (Beta vulgaris L) as affected by defloliation intensity

Zbornik Matice srpske za prirodne nauke (2006)

D. A. Karadimos J. T. Tsialtas N. Maslaris Despo K. Papakosta

The aim of this work was to study the effect of sugar beet re-growth after water stress defoliation on root rots of three cultivars (Europa, Rival Corsica), which were spring sown in Thessaly, central Greece, for two growing seasons (2003-04). At the beginning of July, sugar beets were subjected to water deficit with irrigation withholding. A month later, three defoliation levels (control - C, moderate - MD, severe - SD) and irrigation were applied. Thus, sugar beets were forced to re-grow and three harvests (15, 30 and 40 days after defoliation - DAD) were conducted. Rotted roots per hectare were counted and pathogens were identified. Data were analyzed as a four-factor randomized complete block design with years, defoliation levels, sampling times and cultivars as main factors. The number of rotted roots was increased with the defoliation level and was significantly higher for SD sugar beets (3748 roots ha?1). No significant differences were found between C and MD treatments (1543 and 2116 roots ha?1, respectively). Rival was the most susceptible cultivar to root rots. Sugar beets were more susceptible to rotting 15 and 40 DAD (2778 and 2998 roots ha?1). The causal agents of root rots were the fungi, Fusarium spp., Rhizopus stolonifer, Macrophomina phaseolina and Rhizoctonia solani.

Macrophomina phaseolina

Root rot

Hectare

10.2298/zmspn0610123k

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Citations (2)

Effect of chloride in irrigation water and form of nitrogen fertilizer on Virginia (flue-cured) tobacco

Field Crops Research (2004)

N.A. Karaivazoglou Despo K. Papakosta S. Divanidis

Curing of tobacco

Transplanting

10.1016/j.fcr.2004.09.006