The effect of colored plastic films on the photosynthetic characteristics and content of active ingredients of Dysosma versipellis

Severity of target spot and gas-exchange in tomato cultivated under colored films

“…In comparison with the green, yellow and the clear colorless film, photosynthetic rates (P n ), stomatal conductance (g s ) and transpiration tended to increase in plants growing under red and blue films, but overall the film covering had no significant effect on P n , g s and transpiration (Table 2, p > 0.10). Our results are in disagreement with those reported by He et al (2018) and Arena et al (2016), who found an effect of light quality on photosynthetics traits. The discrepancy with those findings can be ascribed, at least in part, to the biotic (leaf infection by target-spot) conditions during the experimental period.…”

“…Light quality also affects biomass production and physiological variables, such as photosynthetic rates and stomatal conductance (Arena et al, 2016;Choong et al, 2018). For instance, Dysosma versipellis (Hance) M. Cheng grown under yellow and blue films may have lower photosynthetic rates than under white or red films (He et al, 2018), while stomatal conductance can be higher in tomato plants grown under red, green and blue light than under white light (Arena et al, 2016). Whereas, Perilla frutescens (L.) Britt grown under blue, red and green films can produce less biomass than control plants under natural light (Grbic et al, 2016).…”

Structurally diverse biflavonoids from Dysosma versipellis and their bioactivity

“…Based on the IC 50 values, all racemates 1-5 exhibited satisfactory AChE inhibitory activity in the range of micromolar concentrations (IC 50 values 2.72-6.74 mM), and more potent inhibitory activity than their corresponding levorotatory or dextrorotatory enantiomers. Among all of biosynthetically related precursors (8)(9)(10)(11), only quercetin (9) are more active than racemates 2-5. The combination between quercetin and dihydrokaempferol or between quercetin and dihydroquercetin by a furan ring reduced the inhibitory activity, for example, compared 2, 4 and 5 to 9.…”

“…24 Only eleven biavonoids have been obtained from plants of the genus Dysosma. [13][14][15][16] Our phytochemical investigations on D. versipellis resulted in the isolation of ve pairs of new biavonoid enantiomers, (±)-dysosmabiavonoids A-E (1-5), two new biavonoids, dysosmabiavonoids F-G (6-7), along with four biosynthetically related precursors (8)(9)(10)(11). Racemates 1-2 represent the rst report of natural C-2-O-C-7 ′ ′ :C3-C6 ′′ biavonoids.…”

“…Its previous phytochemical and pharmacological investigations revealed the presense of bioactive biavonoids, [13][14][15][16] and their neuraminidase inhibitory 13 and cytotoxic properties. 14 In our search for bioactive natural products, ve pairs of new biavonoid enantiomers, (±)-dysosmabiavonoids A-E (1-5), two new biavonoids, dysosmabiavonoids F-G (6-7), along with four biosynthetically related precursors (8)(9)(10)(11) (Fig. 1) were isolated from the roots and rhizomes of D. versipellis.…”