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Articles by I.S. Travlos
Total Records ( 4 ) for I.S. Travlos
  I.S. Travlos , G. Economou , P.J. Kanatas and O. Tzakou
  The allelopathic effects of three plant tissues of Conyza albida (stems, leaves and inflorescences) on oat growth were further investigated using in vivo tests. Oat growth (fresh and dry weights of above and underground parts) was significantly inhibited from phytotoxic activity of upper leaves and inflorescence tissues of C. albida in pot experiments. The inhibition was significantly higher than in the case of stems. The inhibiting action of crude extracts and volatile compounds from young plants (rosette) were examined using two bioassay methods: (a) seed germination and radicle growth of oat and (b) fresh weight of duckweed plants. Both bioassayed species exhibited great phytotoxic response from the young plants, collected in winter, confirming the results of previous studies.
  I.S. Travlos and A.J. Karamanos
  Marama bean (Tylosema esculentum (Burch.) A. Schreib) is an under-utilized perennial tropical grain legume of southern Africa, which produces protein-and oil-rich seed and tubers of relatively high protein and carbohydrate content. Glasshouse-grown marama plants were grown in four different soils and measurements of several growth parameters were taken during all the experimental period. Vegetative and tuber growth and production of the plants grown in the clay and the clay loam soil were significantly restricted and therefore they have to be avoided. On the contrary, well drained light sandy soils seem ideal for marama growth and establishment. This study revealed the beneficial effect of good aeration and drainage on growth and dry matter production of marama. The careful selection of such a soil texture is crucial for a sufficient tuber growth and further establishment of T. esculentum, in order to ensure plant survival under extensive drought conditions, as long as the tubers clearly act as water reservoirs (tuber water content about 85-90%).
  I.S. Travlos and A.J. Karamanos
  Chaste tree (Vitex agnus castus L.) is one of the most important native shrubs in arid and semi arid Mediterranean and western Asia regions, widely used from ancient years for medicinal and other purposes. Laboratory and greenhouse experiments were conducted in Greece, in order to investigate the germination behavior of untreated seeds and seeds subjected to several pretreatments and subsequent emergence of the seedlings. In general, the speed and percentage of seed germination was greatly increased by the most treatments including hot water immersion and dry heating (germination increased up to 83%), clearly indicating that there is a physical (seed coat) dormancy in this species, while untreated seeds (i.e., control) had relatively moderate germination and emergence percentages. This positive (or damaging at high temperatures) effect of dry heat on seed germination and emergence rate and percentage, implies the potential effect of fire on promotion of V. agnus castus seed germination and in some cases it could be taken into account, as long as fire is a frequent ecological factor in Mediterranean-type ecosystems.
  I.S. Travlos , G. Economou and A.J. Karamanos
  Laboratory and greenhouse experiments were conducted in Greece, in order to investigate the germination behavior of untreated seeds and seeds subjected to several pretreatments and subsequent emergence of the seedlings. Germinability of untreated (control) seeds was relatively high (ca. 70%), indicating the presence of primary (coat-imposed) dormancy in a fraction of the seeds studied. Hot water immersion, dry heat, sulphuric acid treatment and water soak effectively relieved dormancy of the hardcoated portion of the seed population and consequently increased rate and final percentage of germination (92, 84, 80 and 78%, respectively). This positive effect of heat on seed germination followed by a massive and rapid seedling emergence might be used as a tool for the control of invasive Spartium populations.
 
 
 
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