02104nas a2200157   4500008004100000245010400041210006900145260000900214300000900223490000700232520158300239100002601822700002501848700003001873856004301903       2008                        eng d00aChromosomal mapping of 18S-25S; 5S ribosomal genes on 15 species of Fagaceae from Northern Thailand0 aChromosomal mapping of 18S25S 5S ribosomal genes on 15 species o  c2008  a5-130 v573 aFifteen species of Fagaceae from Chiang Mai province, northern Thailand, were investi-gated: eight Castanopsis, four Lithocarpus and three Quercus species. The species were generally diploid with the chromosome number 2n = 24, and the basic number x =12 was confirmed in some species with meiosis. One tree belonging to Q. lenticellatus had 2n = 14. Chromosomal mapping of the highly repetitive 18S-25S and 5S ribosomal genes by fluorescence in situ hybridisation (FISH) was performed. Most species (from all three genera) showed four 18S-25S rDNA sites (two pairs: one subterminal major and one paracentromeric/intercalary minor loci) and two 5S rDNA sites (one pair: paracentromeric locus). Quercus kerrii also had two pairs of 18S-25S rDNA sites, but both were subterminal major loci. Two species, C. argentea and Q. brandisianus, only had one pair of 18S-25S rDNA sites. Two species, C. calathiformis and L. vestitus, showed an odd number of (unpaired) sites, and this indicated hybrid origin and/or polyploidy. Polyploid cells were detected in these species. The ribosomal gene maps based on both sequences together were genus-specific. In Castanopsis, the 18S-25S and the 5S genes were local-ized on three different chromosome pairs, and comprised species-specific maps. On the other hand, the ribosomal genes in Lithocarpus and Quercus were found only on two chromosome pairs, because one of the two 18S-25S rDNA loci was localized on the same chromosome as the 5S rDNA locus. The FISH markers may be used to clarify discrepan-cies arising from morphological assessments.1 aChokchaichmnankit, P.1 a-Jonsson, Anamthawat1 aChulalaksananukul, W., K.  uhttps://quercus.myspecies.info/node/1302393nas a2200169   4500008004100000245008500041210006900126260000900195300001200204490000700216520185700223100001502080700001502095700001902110700001602129856007802145       2008                        eng d00aConserving the evolutionary potential of California valley oak (Quercus lobata N0 aConserving the evolutionary potential of California valley oak Q  c2008  a139-1560 v173 aAbstract California valley oak (Quercus lobata Nee) is a seriously threatened endemic oak species in California and a keystone species for foothill oak ecosystems. Urban and agricultural development affects a significant fraction of the species’ range and predicted climate change is likely to dislocate many current populations. Here, we explore spatial patterns of multivariate genotypes and genetic diversity throughout the range of valley oak to determine whether ongoing and future patterns of habitat loss could threaten the evolutionary potential of the species by eradicating populations of distinctive genetic composition. This manuscript will address three specific questions: (i) What is the spatial genetic structure of the chloroplast and nuclear genetic markers? (ii) What are the geographical trends in the distribution of chloroplast and nuclear genotypes? (iii) Is there any part of the species’ range where allelic diversity in either the chloroplast or nuclear genomes is particularly high? We analysed six chloroplast and seven nuclear microsatellite genetic markers of individuals widespread across the valley oak range. We then used a multivariate approach correlating genetic markers and geographical variables through a canonical trend surface analysis, followed by GIS mapping of the significant axes. We visualized population allelic richness spatially with GIS tools to identify regions of high diversity. Our findings, based on the distribution of multivariate genotypes and allelic richness, identify areas with distinctive histories and genetic composition that should be given priority in reserve network design, especially because these areas also overlap with landscape change and little degree of protection. Thus, without a careful preservation plan, valuable evolutionary information will be lost for valley oak.1 aGRIVET, D.1 aSork, V.L.1 aWESTFALL, R.D.1 aDavis, F.W.  uhttp://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-294X.2007.03498.x00462nas a2200145   4500008004100000245009400041210006900135260000900204300001400213490000700227520000800234100001400242700000500256856005500261       2008                        eng d00aEarlywood vessel size of oak as a potential proxy for spring precipitation in mesic sites0 aEarlywood vessel size of oak as a potential proxy for spring pre  c2008  a2249-22570 v353 aAim1 aFonti, P.1 a  uhttp://dx.doi.org/10.1111/j.1365-2699.2008.01961.x00616nas a2200157   4500008004100000245012500041210006900166260000900235300001200244490000700256520010300263100001300366700001200379700002400391856004300415       2008                        eng d00aHeterogeinity and spatial autocorrelation for chloroplast haplotypes in three old growth populations of Northern Red Oak0 aHeterogeinity and spatial autocorrelation for chloroplast haplot  c2008  a212-2200 v573 aIn eastern North America, evidence for cryptic northern refugia could contribute to resolving Reid1 aFENG, Y.1 aSUN, W.1 aROMERO-SEVERSON, J.  uhttps://quercus.myspecies.info/node/1601930nas a2200193   4500008004100000245008800041210006900129260000900198300001200207490000700219520128300226653005101509653001801560653001701578653002801595100001501623700001601638856008201654       2008                        eng d00aTaxonomy of Hill’s Oak (Quercus ellipsoidalis: Fagaceae): Evidence from AFLP Data0 aTaxonomy of Hill s Oak Quercus ellipsoidalis Fagaceae Evidence f  c2008  a148-1580 v333 aAbstract:Quercus ellipsoidalis (Hill’s oak), an endemic of east-central North America, is morphologically similar to Q. coccinea (scarlet oak) and is subsumed into that species in several floristic treatments. This study uses data from more than 250 amplified fragment length polymorphism (AFLP) markers to investigate whether Q. coccinea and Q. ellipsoidalis are genetically distinct from one another. Whereas Q. coccinea and Q. ellipsoidalis separate from one another in all analyses, Q. velutina (black oak) populations collected from the geographic range of both Q. coccinea and Q. ellipsoidalis do not separate out by geographic region. This, combined with the strong differentiation between Q. coccinea and Q. velutina but weak differentiation between Q. ellipsoidalis and Q. velutina, supports the view that Q. coccinea and Q. ellipsoidalis are not simply regional variants of a single taxon. Moreover, while there is no evidence from the molecular data we collected of hybridization between Q. coccinea and Q. ellipsoidalis, the data suggest that there may be gene flow between Q. ellipsoidalis and Q. velutina. A clearer understanding of the relationships among these taxa is essential to understanding the taxonomy of Quercus section Lobate in eastern North America.10aAMPLIFIED FRAGMENT LENGTH POLYMORPHISMS (AFLP)10aHYBRIDIZATION10aOAK TAXONOMY10aQUERCUS SECTION LOBATAE1 aHipp, A.L.1 aWeber, J.A.  uhttp://www.ingentaconnect.com/content/aspt/sb/2008/00000033/00000001/art00017