2006
DOI: 10.1590/s1413-70542006000100007
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Abstract: In this research it was studied the influence of the radiation intensity on growth and on the essential oil yield of Baccharis trimera. The plants growth was studied under four levels of radiation: 100, 60, 50 and 20% during a 259-day long period. Plants were then evaluated for height, number of nodes, branches, stem diameter (at the height of the colon), biomass formation, and content and composition of the oil. The highest level of radiation caused increases in all of the variables evaluated, except for heig… Show more

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Cited by 24 publications
(7 citation statements)
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“…These results corroborate those reported by Silva et al [24,25], who showed that nutrient levels are directly correlated with the dry matter contents of B. trimera. Santos et al [26] also found similar results when examining the effect of increasing organic fertilizer doses on the dry matter content of B. dracunculifolia.…”
Section: Height and Dry Matter Contentsupporting
confidence: 93%
“…These results corroborate those reported by Silva et al [24,25], who showed that nutrient levels are directly correlated with the dry matter contents of B. trimera. Santos et al [26] also found similar results when examining the effect of increasing organic fertilizer doses on the dry matter content of B. dracunculifolia.…”
Section: Height and Dry Matter Contentsupporting
confidence: 93%
“…The volatile metabolites in Baccharis are likely to be influenced by ecological and geographical factors as luminosity (Silva et al, 2006), rainfall regime (Ferracini et al, 1995), ground mineral content (Silva et al, 2007) and/or interaction with insects and predators (Damasceno et al, 2010), and the occurrence of chemotypes based on sesquiterpenes has been also reported (Frizzo et al, 2008). It is therefore arguable that the distinct composition of BU-SC and BU-PR are related to ecological or genetics factors; it is to be expected that the differences observed in these samples CNS activities are consequent to these differences in composition.…”
Section: Discussionmentioning
confidence: 99%
“…In fairness, the high amount of rainfall in July and the highest R April-July in that year could negatively influence the accumulation of essential oils, though the correlation between percentage of essential oils and rainfall was not detected. The higher solar radiation and the whole lightness activate the accumulation of essential oils in Lippia alba (Verbenaceae), Baccharis trimeria (Asteraceae), T. vulgaris: the higher photosynthetically active solar radiation activates the synthesis of the products of photosynthesis, whereof essential oils as the secondary plant metabolites are biosynthesized Gosselin, 1995, 1996;Sangwan et al, 2001;Silva et al, 2006). However, some facts suggest that higher lightness can reduce the accumulation of essential oils in Anethum graveolens (Apiaceae), Salvia officinalis (Lamiaceae), Potomorphe umbelata (Piperaceae) (Saleh, 1973;Halva et al, 1992;Mattana et al, 2010).…”
Section: Effects Of Meteorological Factors On Quantitative Compositiomentioning
confidence: 99%