Kamoutsis, A., Chronopoulou-Sereli, A. and Holevas, C. 1998. Interaction of triapenthenol and environmental factors on the growth and flower bud formation of Gardenia jasminoides Ellis. Can. J. Plant Sci. 78: 635-640. The interaction effects between total solar radiation, air temperature and relative humidity with different concentrations of the plant growth regulator triapenthenol (Baronet) on the vegetative growth and the formation of flower buds of potted gardenia (Gardenia jasminoides Ellis) plants were studied in glasshouse experiments.Triapenthenol was applied as a soil drench at concentrations of 0, 70, 140 and 280 mg L -1 to plants under each of three radiation levels of about 250 (P1), 90 (P2) and 25 (P3) Wm -2 . It was established that the maximum temperature was the most critical environmental factor to plant development at all radiation levels. Lengths of new lateral shoots after pinching and the number of flower buds/plant were significantly reduced when radiation was reduced and triapenthenol concentrations increased. The interaction between total radiation and triapenthenol concentration significantly affected the number of flower buds/plant. An increase in triapenthenol concentration and a reduction of total radiation caused increased wrinkling of the leaves.In the unshaded plot (P1), the 140 mg L -1 triapenthenol concentration produced high-quality plants that were shorter than the untreated ones with more flower buds/plant during the growth period. In the moderately shaded plot (P2), the best market-quality plants were those treated with 70 mg L -1 triapenthenol.Key words: Gardenia jasminoides, temperature, total solar radiation, triapenthenol, relative humidity Kamoutsis, A., Chronopoulou-Sereli, A. et Holevas, C. 1998. Interaction de triapenthenol et des facteurs environmentales sur la croissance et la formation des boutons florales de Gardenia jasminoides Ellis. Can. J. Plant Sci. 78: 635-640. Les effets de l'interaction entre la radiation solaire totale, la température ambiente et l'humidité relative et les concentrations différentes du régulateur de la croissance du triapenthenol (Baronet) sur la croissance végétative et la formation des boutons florales des plantes de gardenia (Gardenia jasminoides Ellis) mises en pots a été étudiée au cours des experiences en serre.Le triapenthenol a été appliqué en arrosage du sol aux concentrations de 0, 70, 140, et 280 mg L -1 aux plantes sous trois niveaux d'intensité de radiation totale d'environ 250 (P1), 90 (P2) et 25 (P3) Wm -2 respectivement. Il était établi que la temperature maximale etait le facteur environmental le plus important pour le développement des plantes sous tous les trois niveaux de radiation. Les longueurs de nouveaux pousses laterales après le pincage et le nombre de boutons florales/plante été réduits significativement quand la radiation est réduite et les concentrations du triapenthenol sont augmentées. L'interaction entre le niveau de la radiation et la concentration du triapenthenol ont affecté significativement le nombre d...
. 2001. Response of Lantana camara L. subsp. camara to paclobutrazol and shading. Can. J. Plant Sci. 81: 761-764. The effects of several shading materials on the response of Lantana camara L. subsp. camara to paclobutrazol were investigated in 1997 and 1998 under greenhouse conditions in Attica (37°48'20"N, 23°57'48"E), Greece. Treatments were shading (0%, 28% and 65%) and paclobutrazol (0, 20, 40, 80 and 160 mg L -1 ) drenches after pinching of the plants.As paclobutrazol concentration increased, plant growth, expressed by the growth index (GI), decreased, at all shading levels. At the same time, the number of flowers per plant increased to a maximum as paclobutrazol concentration increased to 80 mg L -1 . Concentrations above this resulted in a decrease in the number of flowers per plant, at all shading levels. The interaction between shading level and paclobutrazol concentration significantly affected the studied parameters. The growth index increased while the number of flowers per plant decreased as shading increased from 0% to 65%, at all concentration levels examined.Plants treated with paclobutrazol had greener leaves. At higher concentrations, some leaf distortion was noted. The most attractive plants (small with maximum flowering) were obtained with 80 mg L -1 paclobutrazol at 0% shading.
The present study explored air temperature and thermal comfort conditions in mountainous region of Nafpaktia (Municipality of Apodotia, Prefecture of Aitoloakarnania), a region without important commercial, industrial or other activities in west continental Greece, and in Athens, a metropolitan urban center in southeast continental Greece. There were 11 study sites in the case of Nafpaktia (676-1455 m altitude), areas with different altitude, ground cover, plant species and plant density. There was one study site in Athens (30 m altitude) nearby a densely built area, under the pressure of industrial activities and heavy traffic. Air temperature and humidity, 1.5 m above ground surface, were monitored simultaneously every 15 min in each site for the period between 1 July and 31 August 2006. Air temperature and relative humidity data were used for the calculation of the thermohygrometric index (THI) from which thermal comfort conditions were evaluated. For this work, two sites of mountainous Nafpaktia region (MNR), one characterized by the lower (fir and chestnut forest area) and the other by the higher (Evinos River area) average THI value, are presented. Results showed that MNR provided clearly improved air temperature and thermal comfort conditions in comparison to Athens in the study period. Fir and chestnut forest area was more beneficial, from a bioclimatological point of view, compared to Evinos River area. Therefore, fir and chestnut forest area should be further supported as a reliable alternative tourist destination for rest and recreation.
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