Interaction of triapenthenol and environmental factors on the growth and flower bud formation of Gardenia jasminoides Ellis

Abstract

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...

Response of Lantana camara L. subsp. camarato paclobutrazol and shading

“…This regulator either increases (Wilkinson and Richards 1991;Ranney et al 1994) or decreases flowering (Gad et al 1997;Plummer and Wann 1998) in other ornamental plants. Light availability influencing uptake and translocation of growth regulators (Muzik 1976) can be changed by the use of shading materials above plant canopies; this, in combination with the use of growth regulators, may be helpful in commercial production (Kamoutsis et al 1998).…”

Growth and Flowering of Lantana camara L. subsp. camara as Affected by Triapenthenol and Environmental Factors

“…Some leaf distortion was noticed in plants treated with the higher concentrations of the regulator. Kamoutsis et al (1998) observed wrinkling on the leaves of Gardenia jasminoides treated with triapenthenol.…”

“…The multiple regression analysis showed that minimum temperature and PPF were the most important factors in plant GI change for 1997 and 1998 respectively (data not shown), at all shading levels. Kamoutsis et al (1998) reported that the maximum temperature was the most important factor in the development of gardenia.…”

“…The uptake and translocation of growth regulators is known to be infl uenced by temperature and light intensity (Muzik, 1976). A change in light intensity by the use of shading materials above plant canopies in combination with triapenthenol was studied in gardenia (Gardenia jasminoides) plants by Kamoutsis et al (1998).…”

Φωτοσυνθετικά ενεργός ακτονοβολία και ρυθμιστές ανάπτυξης στην αύξηση και άνθηση της Lantana Camara L. subsp. Camara

“…Το μήκος της νέας βλάστησης μετά την επίδραση του κορυφολογήματος και ο αριθμός των ανθοφόρων οφθαλμών ανά φυτό μειώθηκαν σημαντικά σε φυτά Gardenia jasminoides Ellis που δέχθηκαν triapenthenol σε συγκεντρώσεις 70 έως 280 mg/1 και αναπτύχθηκαν σε διαφορετικά επίπεδα ολικής ηλιακής ακτινοβολίας (Kamoutsis et al, 1998). Οι Chronopoulou-Sereli et al (1998) ανέφεραν ότι η θερμοκρασία του αέρα είναι σημαντικότερος μικρομετεωρολογικός παράγοντας σε σχέση με την ηλιακή ακτινοβολία στην ανάπτυξη φυτών γαρδένιας που δέχθηκαν triapenthenol χωρίς σκίαση.…”