| metal accumulation strategies in plants spontaneously inhabiting zn-pb waste deposits. | metal (zn, pb, cd, cu, ni, cr) accumulation in shoots of 38 plant species spontaneously colonizing three zn-pb waste deposits in southern poland was studied in order to find out if the age of the waste (30-130 years) or its type (slag or flotation residues) influence metal content in plants and to identify species potentially suitable for biomonitoring and phytoremediation. the total metal concentrations in the waste upper layers ranged from 7300 to 171,790 mg kg(-1) for zn, from 1390 to 22,265 ... | 2014 | 24793328 |
| a deficiens homologue is down-regulated during apomictic initiation in ovules of hieracium. | hieracium is a member of the asteraceae family, and contains sexual species in addition to apomictic species that reproduce by apospory and produce seed without fertilization. a homologue of the floral organ-identity gene deficiens (def) was isolated from an apomictic line of hieracium piloselloides (vill.) following differential display between mature ovules and those initiating autonomous embryogenesis. the gene termed hpdef has 93% amino acid identity with gdef2, a def homologue isolated from ... | 2000 | 10872222 |
| expression of rolb in apomictic hieracium piloselloides vill. causes ectopic meristems in planta and changes in ovule formation, where apomixis initiates at higher frequency. | the effects of the agrobacterium rhizogenes rolb oncogene on apomixis were examined in the facultative apomictic plant hieracium piloselloides because the oncogene has been shown to alter plant growth, morphogenesis and cellular sensitivity to auxin. introduction of rolb under the control of either its own promoter or the camv35s promoter induced ectopic meristem formation from the inflorescence, confirming in planta a meristem-inducing role for this oncogene previously observed only in tissue c ... | 2001 | 11800383 |