1,721,036 research outputs found
Benzyladenine and Thidiazuron Postharvest Treatments for Preserving Cut Lily Flowers
No full textThe vase life of cut lilies stored for a long time or transported over long distances, may be reduced. Typical postharvest problems are early tepal wilting and abscission and leaf yellowing. Following harvest, chlorophyll losses are induced by the lack of endogenous cytokinins, which are biosynthesized in roots. As the roots
are removed there is no cytokinin supply to the shoot in the postharvest phase. The objective of this work was to evaluate thidiazuron as a potential postharvest treatment for preventing chlorophyll losses during storage and for extending the vase life. Lily flowers were harvested at commercial stage when buds begin to show colour. Thidiazuron 10 μM was compared with benzyladenine 50 or 100 μM; both were applied as pulse or continuous treatments. After storing cut flowers for three weeks at 5°C, flowers were transferred to a postharvest evaluation room under controlled environmental conditions. Vase life, chlorophyll content, weight change and relative water content were monitored. Results showed that thidiazuron-treated stems had higher chlorophyll content compared with the control and benzyladenine
treatments. After three weeks of cold storage, the chlorophyll content of thidiazuron-treated flowers was 0.84 mg/g FW which was significantly higher than the content of the control (0.57 mg/g FW). Thidiazuron slowed down the degradation processes and, after storage, the chlorophyll decline was only 25% of the initial value. Weight loss was higher in continuously applied treatments
compared with control and pulse treatments. In conclusion, results obtained showed that the best treatment for preserving cut lilies was a pulse treatment for 24 h with 10 μM thidiazuron
Strategie per lo sviluppo di piante ornamentali NaCl – tolleranti attraverso la selezione in vitro
No full textBorage extracts affect wild rocket quality and influence nitrate and carbon metabolism
Full text linkMarket is increasingly demanding vegetables with high quality and nutraceutical characteristics. It was demonstrated that leafy vegetables can get benefit from biostimulants, for the reduction of nitrate concentration and the increment of antioxidants, with potential benefit for human health. The research purpose was to investigate on the role of a novel plant-based biostimulant in affecting nitrogen and carbon metabolism in wild rocket (Diplotaxis tenuifolia L.). Foliar spray treatments were performed with extracts obtained from borage (Borago officinalis L.) leaves and flowers. To evaluate the treatments effect, in vivo determinations (chlorophyll a fluorescence and chlorophyll content) were performed. At harvest, nitrate concentration, sucrose, total sugars, chlorophyll, and carotenoids levels were measured in leaves. In order to characterize the mechanism of action also at molecular level, a set of genes encoding for some of the key enzymes implicated in nitrate and carbon metabolism was selected and their expression was measured by qRT-PCR. Interesting results concerned the increment of sucrose, coherent with a high value of Fv/Fm, in addition to a significant reduction of nitrate and ABA than control, and an enhanced NR in vivo activity. Also, genes expression was influenced by extracts, with a more pronounced effect on N related genes
Involvement of Phytohormones in Plant Responses to Ozone. In book: Plant Hormones under Challenging Environmental Factors
No full textMolecular and physiological responses to salt stress in salinity-sensitive and tolerant Hibiscus rosa-sinensis cultivars
Full text linkAbstract Ornamental plants are used to decorate urban and peri-urban areas, and during their cultivation or utilisation, they can be exposed to abiotic stress. Salinity is an abiotic stress factor that limits plant growth and reduces the ornamental value of sensitive species. In this study, transcriptomic analysis was conducted to identify genes associated with tolerance or sensitivity to salinity in two hibiscus (Hibiscus rosa-sinensis L.) cultivars, ‘Porto’ and ‘Sunny wind’. The physiological and biochemical parameters of plants exposed to 50, 100, or 200 mM NaCl and water (control) were monitored. Salinity treatments were applied for six weeks. After four weeks, differences between cultivars were clearly evident and ‘Porto’ was more tolerant than ‘Sunny wind’. The tolerant cultivar showed lower electrolyte leakage and ABA concentrations, and higher proline content in the leaves. Accumulation of Na in different organs was lower in the flower organs of ‘Porto’. At the molecular level, several differential expressed genes were observed between the cultivars and flower organs. Among the highly expressed DEGs, coat protein, alcohol dehydrogenase, and AP2/EREBP transcription factor ERF-1. Among the downregulated genes, GH3 and NCED were the most interesting. The differential expression of these genes may explain the salt stress tolerance of ‘Porto’. Graphical Abstrac
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