Guangxi Forestry Research Institute

Nanning, China

Guangxi Forestry Research Institute

Nanning, China
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Yang Z.Q.,Guangxi Forestry Research Institute | Chen H.,Guangxi Forestry Research Institute | Tan J.H.,Guangxi Forestry Research Institute | Xu H.L.,Guangxi Forestry Research Institute | And 2 more authors.
Genetics and Molecular Research | Year: 2016

Pinus massoniana Lamb. is an important timber and turpentine-producing tree species in China. Dendrolimus punctatus and Dasychira axutha are leaf-eating pests that have harmful effects on P. massoniana production. Few studies have focused on the molecular mechanisms underlying pest resistance in P. massoniana. Based on sequencing analysis of the transcriptomes of insect-resistant P. massoniana, three key genes involved in the flavonoid metabolic pathway were identified in the present study (PmF3H, PmF3'5'H, and PmC4H). Structural domain analysis showed that the PmF3H gene contains typical binding sites for the 2OG-Fe (II) oxygenase superfamily, while PmF3'5'H and PmC4H both contain the cytochrome P450 structural domain, which is specific for P450 enzymes. Phylogenetic analysis showed that each of the three P. massoniana genes, and the homologousgenes in gymnosperms, clustered into a group. Expression of these three genes was highest in the stems, and was higher in the insect-resistant P. massoniana varieties than in the controls. The extent of the increased expression in the insect-resistant P. massoniana varieties indicated that these three genes are involved in defense mechanisms against pests in this species. In the insect-resistant varieties, rapid induction of PmF3H increased the levels of PmF3'5'H and PmC4H expression. The enhanced anti-pest capability of the insect-resistant varieties could be related to temperature and humidity. In addition, these results suggest that these three genes maycontribute to the change in flower color during female cone development. © 2016 The Authors.

Grant J.C.,Southern Cross University of Australia | Nichols J.D.,Southern Cross University of Australia | Yao R.L.,Southern Cross University of Australia | Yao R.L.,Guangxi Forestry Research Institute | And 3 more authors.
Forest Ecology and Management | Year: 2012

Understanding depth distribution of roots may help develop an understanding of plant productivity and the limits to productivity by indicating which parts of the soil profile are being accessed for water and nutrients. The subtropical east coast of Australia provides climatic and soil conditions that produce some of the highest plant productivity rates in the country. This has been recognised by the hardwood plantation industry and over the last decade a substantial estate of plantations has been established with plans for further expansion. However, two of the major species used, Eucalyptus dunnii and Corymbia citriodora subsp. variegata, have had little published research directly related to root depth distribution in the area. We examined root depth distribution in established plantations of E. dunnii and C. citriodora subsp. variegata under three contrasting soil types using the techniques of soil trench profile and coring. The results showed that the fine roots of C. citriodora subsp. variegata are at lower densities in poorly structured subsoils than the roots of E. dunnii. The root densities of both species in the subsoils of a Vertosol soil (with high levels of reactive, shrink-swell clays) were lower than for the other soil types. In native vegetation Vertosols are often colonised by grasses with few, scattered trees from a limited range of species. Our findings show lower levels of root growth in the Vertosols, particularly into the subsoil and this is likely to be the reason that productivity on these, otherwise fertile soils, is restricted. © 2011 Elsevier B.V.

Xu H.L.,Guangxi Forestry Research Institute | Chung W.Y.,Chonnam National University
Journal of the Korean Wood Science and Technology | Year: 2012

Mass transfer behavior in wood was estimated through its microscopic structure. The diffusion coefficients which were decided by theoretical equations are influenced by different anatomical properties of wood. From the experiment, the moisture flux was linear to the square root of time. The diffusion coefficients had a regular tendency during the time elapse. During the modeling, it is necessary to understand the limitation of parameters and consider the particular situation to be simulated. In hardwood, because the apertures were not considered, tangential mass transfer simulation was totally different from experiment. As a result, a hardwood model design should consider the apertures which are even on the fiber walls.

Li D.-W.,Guangxi Forestry Research Institute | Wang G.-Q.,China Agricultural University | Wei S.-G.,Guangxi University
Zootaxa | Year: 2010

A new genus and three new species of eriophyid mites from Guangxi Zhuang Autonomous Region, South China are described and illustrated: Calliparus lanceolarus n. gen., n. sp. infesting Glochidion lanceolarium (Roxb.) Voigt (Euphorbiaceae); Colopodacus glochidion n. sp. infesting Glochidion sp. (Euphorbiaceae) and Neocosella laurifolia n. sp. infesting Genianthus laurifolius (Roxb.) Hook.f. (Asclepiadaceae). All species described here are vagrants on the undersurface of host leaves. Copyright © 2010 Magnolia Press.

PubMed | CAS Institute of Botany, Guangxi Forestry Research Institute and Central South University of forestry and Technology
Type: Journal Article | Journal: Genetics and molecular research : GMR | Year: 2016

Zelkova schneideriana is endemic to China and belongs to the Ulmaceae. It is listed as a Near Threatened species in the China Biodiversity Red Data Book. We conducted a phylogeographical study of two chloroplast regions (psbA-trnH and trnG-trnM) in several Chinese Z. schneideriana populations, in order to examine the genetic diversity, population structure, and evolutionary history of the species. In all, 10 haplotypes were detected. The population from Sangzhi, Hunan, had the highest nucleotide diversity ( = 0.00653) and haplotype diversity (HD = 1.000), and should be considered the most suitable population to be protected under an in situ conservation strategy. Seed collections from as many individuals as possible in other populations would preserve the genetic diversity of Z. schneideriana.

Yang X.-H.,Beijing Forestry University | Yu Y.-H.,Guangxi Gaofeng Forestry Farm | Yu Y.-H.,Guangxi University | Wu Y.-J.,Guangxi Forestry Research Institute | And 2 more authors.
Journal of Economic Entomology | Year: 2013

Endoclita signifier Walker (Lepidoptera: Hepialidae) has become a new wood borer pest in Eucalyptus plantations in southern China. This article documents survey results of its geographic distribution and host plant range in Guangxi and its morphological measurements, life cycle and behavior. In total, 83 Eucalyptus growing counties were surveyed. E. signifier was found in 59 counties. Host plants included 31 species in 16 families and 24 genera. Four Eucalyptus hybrid species were recorded as its host plant with E. grandis × E. urophyllo and E. urophylla × E. grandis infested the heaviest. The infestation of Eucalyptus trees 1-2 yr old was heavier than that of older trees. Most individuals of E. signifier took 1 yr to complete a generation, overwintering as larvae in tunnels in wooden stems, and pupating in February of the following year. Adults emerge, mate, and lay eggs in April, and the eggs hatch in late April or early May. Adult emergence peaks between 17:00-18:59 hours. Mating flights last under 30 min at dusk and the copulation duration was 24 h. Moths were large, weighting and average of 3.4 g. Eggs and newly hatched larvae were very small, weighing only 0.127 ± 0.001 mg and 0.093 ± 0.017 mg, respectively. The larvae have two distinct development stages. One stage spends 1-2 mo living in the forest litter, the second stage then moves to woody stems where it feeds for ≈10 mo. Larvae start boring into hosts between June and November, mainly in July and August. This study indicated that E. signifier, a highly polyphagous native species, has shifted host to exotic Eucalyptus and can cause significant damage to plantations. © 2013 Entomological Society of America.

Xiong Y.,Chinese Academy of Forestry | Liu X.,Chinese Academy of Forestry | Liu X.,Guangxi Forestry Research Institute | Guan W.,Chinese Academy of Forestry | And 4 more authors.
Plant and Soil | Year: 2016

Aims: It has been increasingly recognized that only distal lower order roots turn over actively within the <2 mm fine root system of trees. This study aimed to estimate fine root production and turnover rate based on lower order fine roots and their relations to soil variables in mangroves. Methods: We conducted sequential coring in five natural mangrove forests at Dongzhai Bay, China. Annual fine root production and turnover rate were calculated based on the seasonal variations of the biomass and necromass of lower order roots or the whole fine root system. Results: Annual fine root production and turnover rate ranged between 571 and 2838 g m−2 and 1.46–5.96 yr−1, respectively, estimated with lower order roots, and they were increased by 0–30 % and reduced by 13–48 %, respectively, estimated with the whole fine root system. Annual fine root production was 1–3.5 times higher than aboveground litter production and was positively related to soil carbon, nitrogen and phosphorus concentrations. Fine root turnover rate was negatively related to soil salinity. Conclusions: Mangrove fine root turnover plays a more important role than aboveground litter production in soil C accumulation. Sites with higher soil nutrients and lower salinity favor fine root production and turnover, and thus favor soil C accumulation. © 2016 Springer International Publishing Switzerland

Li F.,Chinese Academy of Forestry | Gan S.,Chinese Academy of Forestry | Zhang Z.,Guangxi Forestry Research Institute | Weng Q.,Chinese Academy of Forestry | And 2 more authors.
Silvae Genetica | Year: 2011

A proper identification of clones is necessary in clonal forestry and will help to protect the legitimate interests of breeders, growers and industry. Twenty-four of the Eucalyptus clones most widely cultivated in China were analyzed using a set of 24 microsatellite markers to develop their DNA-based fingerprints and exploit the genetic variations. A total of 286 alleles were detected, averaging at 11.9 alleles per marker locus. All the microsatellites were polymorphic among the clones investigated. The observed heterozygosity (Ho) varied with locus between 0.500 and 1.000 with a mean of 0.885. The 24 clones could be uniquely fingerprinted based on their multilocus genotypes at a minimum of three loci (Embra169, Embra72 and Embra2). The dendrogram constructed from the genotypic similarity coefficients separated the 24 clones into three groups, matching essentially the historically known or speculated clonal origins. Clones T13, Guanglin-5 and Guanglin- 9 turned out to be full siblings of cross DH32 while the DH201-2 sampled here appeared to be mislabelled.

PubMed | Beijing Forestry University and Guangxi Forestry Research Institute
Type: Journal Article | Journal: Genetics and molecular research : GMR | Year: 2016

Cinnamyl alcohol dehydrogenase (CAD) catalyzes the final step in lignin biosynthesis. The genus Eucalyptus belongs to the family Myrtaceae, which is the main cultivated species in China. Eucalyptus urophylla GLU4 (GLU4) is widely grown in Guangxi. It is preferred for pulping because of its excellent cellulose content and fiber length. Based on GLU4 and CAD gene expression, a Eucalyptus variety low in lignin content should be obtained using transgenic technology, which could reduce the cost of pulp and improve the pulping rate, and have favorable prospects for application. However, the role and function of CAD in GLU4 is still unclear. In the present study, EuCAD was cloned from GLU4 and identified using bioinformatic tools. Subsequently, in order to evaluate its impact on lignin synthesis, a full-length EuCAD RNAi vector was constructed, and transgenic tobacco was obtained via Agrobacterium-mediated transformation. A significant decrease in CAD expression and lignin content in transgenic tobacco demonstrated a key role for EuCAD in lignin biosynthesis and established a regulatory role for RNAi. In our study, the direct molecular basis of EuCAD expression was determined, and the potential regulatory effects of this RNAi vector on lignin biosynthesis in E. urophylla GLU4 were demonstrated. Our results provide a theoretical basis for the study of lignin biosynthesis in Eucalyptus.

PubMed | Guangxi Forestry Research Institute and Central South University of forestry and Technology
Type: Journal Article | Journal: Genetics and molecular research : GMR | Year: 2016

Microsatellite markers were isolated using dual-suppression-PCR for the endangered species Excentrodendron hsienmu (Tiliaceae) to evaluate the genetic diversity and population structure of this species. A total of 11 polymorphic microsatellite loci were characterized in E. hsienmu. The number of alleles per locus ranged from 2 to 9, with an average of 5.27. The expected heterozygosity value ranged from 0.053 to 0.780, with an average of 0.568 and the observed heterozygosity value ranged from 0 to 0.595, with an average of 0.268. The polymorphic information content value ranged from 0.051 to 0.740, with an average of 0.521. These newly designed markers will be of great potential significance and profound influence in future research related to the genetic diversity, population structure, and patterns of gene flow of this species, which will contribute to the implementation of conservation and management strategies for this species.

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