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Effect of growth media and plant growth promoting rhizobacteria (PGPR) on growth and flowering indices of China Aster

Our work focused on applying different growth media and plant growth promoting rhizobacteria (PGPR) treatments on growth parameters of China Aster as a worldwide ornamental plant. This plant has many uses such as medicinal plant, seasonal and cut flower and green spaces or landscaping. The treatments included four types of growth media (soil (S), soil+perlite (SP), soil+cocopeat (SC) and soil+cocopeat +perlite (SCP)) and three types of incubation status included incubation with plant growth promoting rhizobacteria (PGPR) of Bacillus subtilis (B.subtilis) and Pseudomonas putida (P.putida), and no-bacterial incubation with three replicates. Regardless of growth media, P.putida had greater plant height than B.subtilis. SCP with or without bacterial incubation had the highest plant height and numbers of axillary shoots among the applied growth media. SCP with P.putida had the greatest chlorophyll content (1.29 mg.g-1 FW) and leaf area (1495.05 mm2). SCP with or without bacterial incubation had the highest number and diameters of flowers among other treatments. SCP plus P.putida showed maximum leaf nitrogen (N), SC and SP plus B.subtilis had highest leaf phosphorous (P) and potassium (K), respectively. Our results demonstrated that applying SCP as a compound growth media, with or without bacterial incubation, had best effects on growth and flowering indices.

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Improvement of germination, sprout weight and nutraceutical potential of mung bean (Vigna radiata) sprouts by melatonin, as an elicitor

Using elicitors is one of the innovative techniques being currently applied for improving phenolic content, antioxidant capacity, and bioactive compounds in ready-to-eat sprouts. Therefore, this experiment was designed to evaluate the effect of melatonin (MT), as an elicitor, on mung bean germination and its sprout’s yield and nutraceutical quality for a 5-day period during seed germination. Results showed that the processes involved on the 5 th day of germination led to an increase in total soluble protein (TSP), free amino acids (FAA), vitamin C, and antioxidant activity in the treated mung bean sprouts. In contrast, as time goes by, the rate of titratable acidity (TA), total phenolic content (TPC), flavonoid compounds, and reducing power decreased. Moreover, MT increased the percentage of seed germination (18.84%) and sprout weight (25%), as compared to the controls. Eliciting the seed of mung bean with MT resulted in enhancing total soluble solids (TSS), TSP, FAA, and reducing power. In the sprouts of mung beans, similarly, it increased the TPC, flavonoid compounds, vitamin C, and antioxidant potential. In conclusion, using MT could change the phytochemical profiles of ready-to-eat sprouts and improve the health-promoting potential of produced sprouts during germination.

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