Phenolics and condensed tannins of high altitude Pteridium arachnoideum in relation to sunlight exposure, elevation, and rain regime

Variations in Soil Alter Availability of Carlinoside:An Anti-Hepatitic Compound from <i>Cajanus cajan</i> (LINN.) Leaves

“…This may influence the biosynthesis of phenolics in general and carlinoside, in particular, in C. cajan. Our results are in good agreement with previous findings [12][13][14] . LA soils exhibited significantly higher acidity (pH = 5.17) compared to AL soils (pH = 6.07).…”

“…Interestingly, positive loading of precipitation, humidity and solar insolation was also noteworthy. Duration, wavelength and quantity of solar radiation strongly influence photosynthetic carbon fixation and biomass accumulation 12,16 . Positive loading of some trace elements like Mn, Mg, Ca and Zn indicates significant influence of bioavailability of these elements Total phenol content in C. cajan leaves was positively correlated to TKN, Ca, Fe and air temperature, while precipitation, soil WHC, TOC and Mn content had negative correlation with total phenol.…”

Influence of cultivation conditions, season of collection and extraction method on the content of antileishmanial flavonoids from Kalanchoe pinnata

“…Mechanisms that induce seasonal variations may include one or all three of the following environmental conditions: day length, sunlight, and/or temperature, which vary markedly according to the season (Yao et al, 2005). Also the water availability, that is lower in winter, is a factor that should be considered when comparing leaves flavonoid content in different seasons (Alonso-Amelot et al, 2007). Similar to other secondary pathways in plants, the biosynthetic pathway of flavonoids is under complex control by multiple regulatory genes at the transcriptional level (He et al, 2008).…”

Altitudinal and seasonal changes of phenolic compounds in Buxus sempervirens leaves and cuticles

“…Hence, higher leaf phenolic content is expected with increasing altitudes [15e24] or in the seasons with the highest UV-B irradiance [19,25,26], although a compound-specific variation has been reported [27]. However, altitudinal or seasonal variations in leaf phenols have also been related to other environmental factors, such as temperature [28e30], edaphic properties (texture and nutritional soil parameters) [31] or water availability [18]. Some previous studies have also suggested an ontogenetic effect more than an environmental effect on the total amount of UV-absorbing compounds in Mediterranean [32] or sub-Mediterranean [33] species.…”