| neonectria castaneicola and neo. rugulosa in japan. | differences between neonectria castaneicola, which causes stem and perennial canker of trees, and neo. rugulosa have not been clearly shown in previous studies. in this study these two species were compared in detail using 17 japanese isolates consisting of 10 strains of neo. castaneicola and seven of neo. rugulosa. four-spored asci were constantly found in neo. castaneicola and this species produced larger ascospores and macroconidia than neo. rugulosa which produced eight-spored asci. the mati ... | 2005 | 16596957 |
| [distribution pattern of meso-micro soil fauna in eucalyptus grandis plantation]. | in this paper, meso-micro soil fauna were extracted and collected by baermann's and tullgren' s method, and their distribution pattern in the eucalyptus grandis plantation of hongya county, sichuan province was studied. a total of 13 550 specimens were collected, belonging to 6 phyla, 13 classes, and 26 orders. acarina, nematoda, collembola were the dominant groups, and enchytraeidae was the frequent one. the group and individual numbers of meso-micro soil fauna varied with seasons, being the ma ... | 2006 | 17330474 |
| phylogeny and taxonomy of the oak powdery mildew erysiphe alphitoides sensu lato. | phylogenetic analyses of erysiphe alphitoides s. lat. using sequences of the rdna its region and the d1/d2 domains of the 28s rdna revealed a complex consisting of several genetically and morphologically distinguished taxa, including the already described erysiphe alphitoides s. str. and e. hypophylla. the ascomata (chasmothecia) of e. hypophylla are morphologically very similar to those of e. alphitoides, but the two species are easily distinguishable by their symptoms, as well as the shape and ... | 2007 | 17681225 |
| biogenic volatile organic compound emission potential of forests and paddy fields in the kinki region of japan. | the standard biogenic volatile organic compound (bvoc) emissions from 10 japanese plant species (quercus serrata, quercus crispula, fagus crenata, quercus acutissima carruthers, quercus glauca, quercus myrsinaefolia, cryptomeria japonica, chamaecyparis obtusa, pinus densiflora, and rice [oryza sativa]) were measured. these species were selected due to their abundance in the estimated domain (47,000 km(2)) of the kinki region. bvoc emission experiments were conducted in a growth chamber where tem ... | 2008 | 18023428 |
| life history of the newly discovered japanese tree sap mite, hericia sanukiensis (acari, astigmata, algophagidae). | hericia sanukiensis (acari, algophagidae) is a species of tree sap mite which has been newly discovered in the sap flux of oak trees (quercus acutissima). in this study, we have clarified the life history of h. sanukiensis at the onset of sap exudation in spring, overwintering deutonymphs molt to tritonymphs as their molting is exacerbated by the sugar contained in the tree sap, and develop to adulthood and reproduce. the mite colony develops as long as the sap continues to exude during the spri ... | 2010 | 19593634 |
| [effects of different types of litters on soil organic carbon mineralization]. | using litter incubation experiment in laboratory, decomposition discrepancies of four typical litters from zijin mountain were analyzed. the results show that organic carbon mineralization rates of soil with litters all involve fast and slow decomposition stages, and the differences are that the former has shorter duration,more daily decomposition quantity while the latter is opposite. organic carbon mineralization rates of soil with litters rapidly reached maximum in the early days of incubatio ... | 2009 | 19662876 |
| [photosynthetic characters of quercus acutissima from different provenances under effects of salt stress]. | the photosynthetic characteristics of quercus acutissima from feixian, chuzhou and wanyuan provenances were investigated under nacl stress at 5 concentrations. for the three provenances, their leaf chlorophyll a (chl a) and chlorophyll b (chl b) contents and net photosynthetic rate (pn) decreased with increasing salt stress, among which, the maximal decrement of chl a content was 21.5%-36.1% for feixian provenance, and 3.5%-19.8% for wanyuan provenance. the diurnal variation of pn, in control gr ... | 2009 | 19947197 |
| effect of simulated acid rain on the litter decomposition of quercus acutissima and pinus massoniana in forest soil microcosms and the relationship with soil enzyme activities. | with the continuing increase in human activities, ecologists are increasingly interested in understanding the effects of acid rain on litter decomposition. two dominant litters were chosen from zijin mountain in china: quercus acutissima from a broad-leaved forest and pinus massoniana from a coniferous forest. the litters were incubated in microcosms and treated with simulated acid rain (gradient ph levels). during a six-month incubation, changes in chemical composition (i.e., lignin, total carb ... | 2010 | 20382410 |
| seawater spray injury to quercus acutissima leaves: crystal deposition, stomatal clogging, and chloroplast degeneration. | effects of seawater spray on leaf structure were investigated in quercus acutissima by electron microscopy and x-ray microanalysis. two-year-old seedlings of q. acutissima were sprayed with seawater and kept in a greenhouse maintained at 25°c. the most recognizable symptoms of seawater-sprayed seedlings included leaf necrosis, crystal deposition, stomatal clogging, and chloroplast degeneration. field emission scanning electron microscopy revealed that the leaf surface was covered with additional ... | 2010 | 20931628 |
| inhibitory effect of glucodistylin from the bark of quercus acutissima on human recombinant aldose reductase and sorbitol accumulation. | a flavanol glycoside, glucodistylin (1) and three polyphenol derivatives, gallate (2), (+)-catechin (3) and (+)-gallocatechin (4) were isolated from an aqueous acetone extract of the bark of quercus acutissima. of these compounds, glucodistylin exhibited uncompetitive inhibitory activity against recombinant human aldose reductase with an ic(50) value of 7.2 ++m. furthermore, glucodistylin inhibited sorbitol accumulation by 48.84% at 50 ++m. this flavonoid showed therapeutic potential in the prev ... | 2011 | 21380803 |
| mirna control of vegetative phase change in trees. | after germination, plants enter juvenile vegetative phase and then transition to an adult vegetative phase before producing reproductive structures. the character and timing of the juvenile-to-adult transition vary widely between species. in annual plants, this transition occurs soon after germination and usually involves relatively minor morphological changes, whereas in trees and other perennial woody plants it occurs after months or years and can involve major changes in shoot architecture. w ... | 2011 | 21383862 |
| critical factors in the limited occurrence of the japanese tree sap mite hericia sanukiensis (acari: astigmata: algophagidae) inhabiting the sap of the oak quercus acutissima. | hericia sanukiensis (astigmata: algophagidae) is a semi-aquatic mite inhabiting fermented sap flux of the japanese sawtooth oak (quercus acutissima) and utilizes nitidulidae (coleoptera) as the dispersal (phoretic) carrier. although nitidulid beetles are commonly found in sap flux, the occurrence of h. sanukiensis has been extremely limited to a few trees in shikoku island, kagawa prefecture, japan. to elucidate the critical factors limiting the occurrence of this species, we compared several ph ... | 2011 | 21479774 |
| landscape-level spatial genetic structure in quercus acutissima (fagaceae). | quercus acutissima (fagaceae), a deciduous broad-leaved tree, is an important forest element in hillsides of south korea. we used allozyme loci, wright's f statistics, and multilocus spatial autocorrelation statistics to examine the distribution of genetic diversity within and among three local populations and the spatial genetic structure at a landscape scale (15 ha, 250 +ù 600 m) on oenaro island, south korea. levels of genetic diversity in q. acutissima populations were comparable to mean val ... | 2002 | 21665723 |
| a comparative flower and fruit anatomical study of quercus acutissima, a biennial-fruiting oak from the cerris group (fagaceae). | a developmental series of flowers and fruits of quercus acutissima (subgenus quercus section cerris) was collected over a growing season and examined for an intersectional, comparative anatomical study. pistillate flowers of the current growing season, each consisting of a pistil with three long, slightly recurved styles, six tepals, and an inconspicuous ovary subtended by a few cycles of cupule scales, emerged in early may, were pollinated by mid-may, and then were quiescent for the remainder o ... | 2003 | 21653332 |
| phytoremediation potential of transplanted bare-root seedlings of trees for lead/zinc and copper mine tailings. | selecting plant species that can overcome unfavorable conditions and increase the recovery of degraded mined lands remains a challenge. a pot experiment was conducted to evaluate the feasibility of using transplanted tree seedlings for the phytoremediation of lead/zinc and copper mine tailings. one-year-old bare-root of woody species (rhus chinensis mill, quercus acutissima carruth, liquidambar formosana hance, vitex trifolia linn. var. simplicifolia cham, lespedeza cuneata and amorpha fruticosa ... | 2016 | 27216539 |
| [seasonal release characteristics of ca, mg and mn of foliar litter of six tree species in subtropical evergreen broadleaved forest]. | seasonal release dynamics of ca, mg and mn during decomposition of foliar litter of pinus massoniana, cryptomeria fortunei, cunninghamia lanceolata, cinnamomum camphora, toona ciliate, and quercus acutissima were investigated in subtropical evergreen broad-leaved forest employing the method of litterbag. after one-year decomposition, the release rates of ca, mg and mn in foliar litter of the studied tree species ranged from -13.8% to 92.3%, from 4.0% to 64.8%, and from 41.6% to 81.1%, respective ... | 2015 | 26995897 |
| nitrate isotopic composition reveals nitrogen deposition and transformation dynamics along the canopy-soil continuum of a suburban forest in japan. | heavy nitrogen (n) deposition often causes high nitrate (no3(-)) accumulation in soils in temperate forested ecosystems. to clarify the sources and production pathways of this no3(-), we investigated no3(-) isotope signatures in deposition processes along the canopy-soil continuum of a suburban forest in japan. | 2014 | 25366401 |
| first detection of endogone ectomycorrhizas in natural oak forests. | the order endogonales in mucoromycotina, an early divergent lineage of fungi, includes ectomycorrhizal (em) fungi. this order is therefore considered a key taxon for elucidation of the evolution of em associations. recent studies have revealed high diversity of em lineages of basidiomycota and ascomycota; however, em associations of endogonales and its relatives remain largely unknown. in this study, em root tips with a unique fungal sheath, with aseptate and highly branched hyphae of variable w ... | 2017 | 27817000 |