Showing papers in "Biochemical Systematics and Ecology in 2003"

TL;DR: It is suggested that physiological constraints limit the defense combinations of any one species to a restricted subset of those observed, as species with the escape syndrome suffer much higher rates of damage.

TL;DR: Root peroxidase and superoxide dismutase activities increased significantly after exposure to allelopathic agents, and Membrane peroxidation was also enhanced by root exudates, root extracts and some of the tested acids.

TL;DR: New studies of the genus Acacia confirm that Acacia is an agglomeration of at least five discrete groups, each with somewhat distinct chemistry.

TL;DR: The bioassay of T. minuta and S. areira oils and their pure principal components revealed strong inhibitory activity of the root growth of Zea mays seedlings and the main components of the essential oils presented an increase in malondialdehyde values from 24 to 48 h indicating lipid peroxidation.

TL;DR: A comparison of the distribution of secondary metabolites in plants with their phylogenetic relationships, thus offers information on the underlying evolutionary and ecological processes and offers insight into life strategies and taxonomic relationships.

TL;DR: A comparative study of the anti-bruchid activity and chemical composition of the essential oils of a germplasm collection of 18 Ocimum basilicum accessions found some essential oils inhibited the oviposition and others caused mortality of the stored pulses pest Callosobruchus maculatus.

TL;DR: In this paper, the effects of glyphosate (N-[phosphonomethyl]-glycine) on the levels of individual hydrolysable tannins in the leaves of mountain birch (Betula pubescens ssp. czerepanovii) were studied.

TL;DR: Floral fragrance compounds of seven Dianthus species and one Saponaria species (Caryophyllaceae) were studied using headspace adsorption technique followed by gas chromatography massspectrometry (GC-MS) to detect meaningful underlying dimensions and to visualize similarities between the investigated species.

TL;DR: It is suggested that further research on thistle chemistry in insect feeding is warranted, since the exotic Canada thistle (Cirsium arvense) is an invasive thistle of current concern in North America and such research on mechanisms underlying host range expansion by exotic insects would be useful.

TL;DR: In this article, a simple method of extraction and HPLC analysis of leaves and stems of bilberry was used to identify phenolic metabolites, including Hydroxycinnamic acid derivatives (HCAs) and flavonoids.

TL;DR: The alkane fraction of cuticular lipids was analyzed in populations of Juniperus communis var.

TL;DR: The deduced amino acid sequences of the membrane-bound desaturase genes have been compared in order to infer their phylogenetic relationships, and phylogenetic and functional data indicate that Δ5 desaturases genes originated independently in different evolutionary lineages from an ancestral Δ6 desatur enzyme.

TL;DR: The presence of methoxylated flavonols and absence of 8-hydroxycirsimaritin and related compounds distinguished species of Dracocephalum and Nepeta, whereas lack of flavonoids with 6- and 8-oxygenation of the A-ring characterised species of the genus Lallemantia.

TL;DR: Flavonoids present in several other crucifer species were identified by TLC only and derivatives of the flavonols, apigenin and luteolin, accumulate in C. abyssinica, C. hispanica and T. arvense leaves.

TL;DR: The main constituent of the commercial tea type is the dihydrochalcone aspalathin, but the presence of other flavonoids such as nothofagin, orientin, isoorientin, vitexin, rutin and isoquercetrin has been reported.

TL;DR: Twelve individual genotypes selected from Juniperus populations, varieties and species were analyzed using ITS sequences, RAPDs, ISSRs, and leaf volatile terpenoids, showing that these data sets can be used at different organizational levels: specific, inter-specific and intraspecific.

TL;DR: The inflorescences and the leaves formed essential oils of the same group only in eight habitats from the 21 investigated, and the main constituents in the oils under study were: β-pinene, 1,8-cineole, chamazulene, camphor, borneol and trans -nerolidol.

TL;DR: Results support a role of oroidin (1) and sceptrin (2) in defence mechanisms against predators and possibly against space competitors and invading and fouling organisms.

TL;DR: Several newly studied species and further accessions of the Lamiaceae have been analyzed for their exudate flavonoid profiles, and the principal compounds accumulated were flavones and their 6-methoxy derivatives, whereas flavonols were rarely encountered.

TL;DR: There is no clear relation in essential oil composition between the studied taxa and the chemical types detected, followed by the phenolic types, the linalool chemotype being recorded only once.

TL;DR: While the size of the total monoterpenes pool is constrained, and is likely influenced by many genes and environmental factors, naturally occurring variation in the allocation of this pool to competing monoterpene fractions is controlled by relatively few genes.

TL;DR: Overall, the evolution of these traits might be constrained by a lack of genetic variation in some environments, but not by negative genetic correlations between the different traits.

TL;DR: Genetic diversity and structure of 15 populations of Phragmites australis growing in the Yellow River Delta and wetlands nearby were investigated using starch gel electrophoresis and demonstrated a clear genetic mosaic.

TL;DR: The essential oils of two endemic Centaurea species from Turkey, C. mucronifera and C. chrysantha, have been studied and many differences were found that could confirm their taxonomic separation.

TL;DR: It is proposed that the observed differences represent phenotypic plasticity enabling this species to inhabit different biogeographic regions.

TL;DR: The chemical components in plant cuticular wax can be used as markers to estimate the species composition of the diet of grazing animals, and apparent selection against L. corniculatus may relate to the much higher condensed tannin content in that species.

TL;DR: There was no relationship between relative dominance of a species in the forest and the fibre or phenolic contents of its mature leaves, and the frequency of species containing tannins together with alkaloids or saponins was significantly lower than the frequencyof species containingTannins alone.

TL;DR: The leaf oils produced from specimens collected at different soil types in the dry season presented the lower percentage contents to 1-nitro-2-phenylethane and methyleugenol, while the mono- and sesquiterpenes compounds present in the same oils showed the higher percentage contents.

TL;DR: Discontinuities in the distribution of secondary metabolites agree well with recent modifications to generic and tribal delimitations and with new phylogenetic hypotheses based on DNA sequence data.

TL;DR: All of the J. c .