| phloem loading. a reevaluation of the relationship between plasmodesmatal frequencies and loading strategies. | the incidence of plasmodesmata in the minor vein phloem of leaves varies widely between species. on this basis, two pathways of phloem loading have been proposed: symplastic where frequencies are high, and apoplastic where they are low. however, putative symplastic-loading species fall into at least two categories. in one, the plants translocate raffinose-family oligosaccharides (rfos). in the other, the primary sugar in the phloem sap is sucrose (suc). while a thermodynamically feasible mechani ... | 2004 | 15516516 |
| lead and cadmium in leaves of deciduous trees in beijing, china: development of a metal accumulation index (mai). | lead and cadmium uptake was investigated for common deciduous street trees in beijing in this study. species having cd accumulation included populus tomentosa, sophora japonica and catalpa speciosa. p. tomentosa had the highest ratios between leaf and soil cd (0.848), followed by s. japonica (0.536), c. speciosa (0.493), paulownia tomentosa (0.453) and juglans regia (0.415). pb levels were high in leaves of c. speciosa, j. regia and pa. tomentosa. s. japonica had the highest ratio between leaf p ... | 2007 | 16797111 |
| paenibacillus catalpae sp. nov., isolated from the rhizosphere soil of catalpa speciosa. | a bacterial strain, designated d75(t), was isolated from the rhizosphere soil of catalpa speciosa. phylogenetic analysis based on the complete 16s rrna gene sequence revealed that strain d75(t) was a member of the genus paenibacillus. high levels of 16s rrna gene sequence similarity were found between strain d75(t) and paenibacillus glycanilyticus ds-1(t) (99.2 %), paenibacillus xinjiangensis b538(t) (97.5 %) and paenibacillus castaneae ch-32(t) (97.2 %). the chemotaxonomic properties of strain ... | 2013 | 22941303 |
| host plant effects on halyomorpha halys (hemiptera: pentatomidae) nymphal development and survivorship. | halyomorpha halys(stål) (hemiptera: pentatomidae) is a highly polyphagous invasive species and an important pest of orchard crops in the united states. in the mid-atlantic region, wild hosts ofh. halysare common in woodlands that often border orchards, andh. halysmovement from them into orchards poses ongoing management issues. to improve our understanding of host plant effects onh. halyspopulations at the orchard-woodland interface, nymphal survivorship, developmental duration, and adult fitnes ... | 2016 | 27012749 |