| insect odour perception: recognition of odour components by flower foraging moths. | odours emitted by flowers are complex blends of volatile compounds. these odours are learnt by flower-visiting insect species, improving their recognition of rewarding flowers and thus foraging efficiency. we investigated the flexibility of floral odour learning by testing whether adult moths recognize single compounds common to flowers on which they forage. dual choice preference tests on helicoverpa armigera moths allowed free flying moths to forage on one of three flower species; argyranthemu ... | 2006 | 16846910 |
| dna degradation and nuclear degeneration during programmed cell death in petals of antirrhinum, argyranthemum, and petunia. | programmed cell death (pcd) was studied in the petals of antirrhinum majus, argyranthemum frutescens, and petunia hybrida, using dna degradation and changes in nuclear morphology as parameters. the petals exhibit loss of turgor (wilting) as a visible symptom of pcd. dna degradation, as shown on agarose gels, occurred in all species studied, prior to visible wilting. the number of dna masses in all the petals of a flower, determined by flow cytometry, markedly increased in argyranthemum and petun ... | 2006 | 16957019 |
| sensitization and cross-reaction patterns in danish compositae-allergic patients. | results of aimed patch testing with constituents of sesquiterpene lactone (sl) mix, compositae mix (cm) and other compositae extracts and allergens in 190 compositae-allergic patients detected in an 8-year period are presented. feverfew of cm elicited positive reactions most frequently, followed by tansy, wild chamomile, yarrow and arnica, whereas dehydrocostus lactone of sl was the most frequent elicitor of positive reactions, followed by alantolactone and costunolide. chrysanthemum (dendranthe ... | 2001 | 11683829 |
| nuclear dna amounts in macaronesian angiosperms. | nuclear dna contents for 104 macaronesian angiosperms, with particular attention on canary islands endemics, were analysed using propidium iodide flow cytometry. prime estimates for more than one-sixth of the whole canarian endemic flora (including representatives of 11 endemic genera) were obtained. the resulting 1c dna values ranged from 0.19 to 7.21 pg for descurainia bourgeauana and argyranthemum frutescens, respectively (about 38-fold difference). the majority of species, however, possessed ... | 2003 | 12824074 |
| susceptibility of chrysanthemum and paris daisy varieties to several isolates of fusarium oxysporum f. sp. chrysanthemi. | fusarium oxysporum f.sp. chrysonthemi is a pathogen recently reported in italy on four economically important ornamental crops belonging to the compositae family: chrysanthemum (chrysanthemum morifolium), paris daisy (argyranthemum frutescens), african daisy (osteospermum sp.) and gerbera (gerbera jamesonii). the risk of transmission of the pathogen among these species is high because the hosts are frequently cultivated in the same nursery. the susceptibility of 24 paris daisy and 12 chrysanthem ... | 2009 | 20222547 |
| occupational dermatitis in danish gardeners and greenhouse workers (iii). compositae-related symptoms. | the clinical part of the study aimed at describing epidemiological and diagnostic aspects of occupational compositae dermatitis. patch testing with the sesquiterpene lactone (sl) and compositae mixes, feverfew extract and supplementary allergens in 250 selected gardeners showed compositae allergy in 25, 17 females and 8 males. 24 were possibly occupationally sensitized. the mean age was lower and the preponderance of women higher compared to classical compositae dermatitis, and the distribution ... | 1998 | 9536405 |
| characterization of in vitro haploid and doubled haploid chrysanthemum morifolium plants via unfertilized ovule culture for phenotypical traits and dna methylation pattern. | chrysanthemum is one of important ornamental species in the world. its highly heterozygous state complicates molecular analysis, so it is of interest to derive haploid forms. a total of 2579 non-fertilized chrysanthemum ovules pollinated by argyranthemum frutescens were cultured in vitro to isolate haploid progeny. one single regenerant emerged from each of three of the 105 calli produced. chromosome counts and microsatellite fingerprinting showed that only one of the regenerants was a true hapl ... | 2014 | 25566305 |
| preventive control of aphids in ornamental plants with complementary parasitoids. | biological control of aphids can be achieved with parasitoids. a parasitoid is a wasp able to parasitize aphids in a host-specific way. these natural enemies of aphids are used in organic or integrated pest management strategies. in order to apply the matching parasitoid against a given aphid species, the aphid has to be detected in the crop and subsequently identified. by the time the aphids are spotted by the grower and then identified by himself or a specialist, it is usually more difficult t ... | 2012 | 23885420 |