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Journal of forestry Research 2021年第1期32卷 225-231页

作者： Arumugam Karthikeyan Thangavel Arunprasad Institute of forest genetics and tree breeding Coimbatore 641002India

The objective of this research was to improve the growth and biomass of Pterocarpus santalinus L.f.(an endangered leguminous tree)using native microbial symbionts such as arbuscular mycorrhizal fungi and Rhizobium associated with native populations of *** native arbuscular mycorrhizal fungi isolated from *** soils were identifi ed as(1)Glomus fasciculatum;(2)Glomus geosporum;and Glomus aggregatum.A nitrogenfi xing microbial symbiont was isolated from the root nodules of *** and identifi ed as Rhizobium aegyptiacum by 16s rRNA gene *** microbial symbionts were inoculated individually and in combination into *** seedling *** 90 days,growth and biomass had improved compared with uninoculated *** and root lengths,number of leaves,stem circumference,number of root nodules,biomass,nutrient uptake and seedling quality index were signifi cantly increased by a combined inoculation of arbuscular mycorrhizal fungi+Rhizobium *** was concluded that native microbial symbionts positively infl uenced *** seedling growth which will be helpful for successful fi eld establishment.

关键词： Arbuscular mycorrhizal fungi Microbial symbionts Pterocarpus santalinus Red sanders Rhizobium aegyptiacum

Responses of Bruguiera sexangula propagules to beneficial microbes in the nursery

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Journal of forestry Research 2018年第4期29卷 1082-1087页

作者： Arumugam Karthikeyan Natchimuthu Balasubramaniam Sivapriya Institute of forest genetics and tree breeding Coimbatore 641002 India

Bruguiera sexangula （Lout） Poir., a threatened mangrove tree, was inoculated with beneficial microbes in a nursery to assess any improvements in growth and bio- mass. From soil samples from the rhizosphere of B. sexangula in a mangrove forest in Panangadu of Kerala India, nitrogen-fixing bacteria Azotobacter chroococcum and Azospirillum brasilense were isolated. The phosphatesolubilising bacterium Bacillus megaterium and potassiummobilizing bacteria Frateruria aurantia were also isolated and cultured on suitable media. Later, ripe propagules of B. sexangula were collected from matured trees and raised in sterilized soil bags （13 × 25 cm） containing sterilized soil and sand （2：1 ratio）. The cultured beneficial microbes were propagated and used to inoculate the ripe propagules of B. sexangula and maintained in the nursery for 6 months. After 6 months, growth and biomass of the inoculated propagules were greater than for the uninoculated control propagules. Shoot length, number of leaves, stem girth and root length were also significantly greater than in the controls. This study showed that the mangrove-specific beneficial microbes influenced the growth of B. sexangula

关键词： Mangroves Bruguiera sexangula Beneficial microbes Nursery Propagules

Expression profiling of the BpIAA gene family and the determination of IAA levels in Betula platyphylla tetraploids

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Journal of forestry Research 2019年第3期30卷 855-867页

作者： Wendi Xu Su Chen Jing Jiang Guifeng Liu State Key Laboratory of forest genetics and tree breeding Northeast Forestry University

Betula platyphylla Sukaczev tetraploids have significantly larger leaf, fruit and stoma (gigantic phenotype) than diploids of the same species;however, the mechanism underlying this difference remains unclear. Tetraploid B. platyphylla transcriptome data have indicated that the expression of genes related to indole-3-acetic acid (IAA) biosynthesis and signal transduction was altered after genome duplication. IAA exerts pleiotropic effects on growth and development by inducing the expression of Aux/IAA. We identified 20 Aux/IAA genes (BpIAA1– BpIAA20) in B. platyphylla distributed across 10 chromosomes. Multiple alignment and motif analyses revealed that nine BpIAA proteins shared all four conserved domains. Phylogenetic analysis indicated that Aux/IAA families were divided into four subfamilies and that there were two pairs of BpIAA sister genes. The BpIAAs were differentially expressed in diploids and tetraploids. Moreover, the expression levels of the nine BpIAA genes were specifically up-regulated in tetraploids from June to September compared with May (except August 5th) in tetraploids, while they were down-regulated in diploids. IAA levels were more than twofold higher in tetraploids than diploids during the vegetative season. These results indicate that genome duplication of B. platyphylla caused the up-regulated of genes involved in IAA synthesis, and the increased concentration of IAA may induce the constitutive expression of 20 BpIAA genes. Therefore, the significant changes in the expression patterns of the BpIAAs contributed to the gigantic phenotype of tetraploids to some extent. Our research sheds light on the phenotypic variations observed in B. platyphylla tetraploids.

关键词： Betula platyphylla Suk. Tetraploid Aux/IAA Expression profile IAA

Growth response of three plantation species of the tropics exposed to elevated CO_2 levels

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Journal of forestry Research 2013年第3期24卷 449-456页

作者： Rekha R. Warrier C. Buvaneswaran P. Priyadharshini R.S.C. Jayaraj Institute of forest genetics and tree breeding Forest CampusR. S. Puram Coimbatore 641002 India

The response of forest trees, the largest carbon sinks on the earth, to continuing rise in atmospheric carbon levels is unknown. Re- ports state that increasing levels of atmospheric CO2 will stimulate pho- tosynthesis and productivity in most ecosystems. However, the duration and magnitude of this stimulation, particularly in the tropics, remains a question. To investigate the effects of CO2 fertilization on plant growth, seedlings of three common plantation species, Casuarina equisetifolia, Ailanthus excelsa and Tectona grandis were grown in closed chambers enriched with CO2. After 180 days of treatment, morphological traits of seedling height, biomass of root and shoot and root-shoot allometric co-efficient were measured. The activity of carbonic anhydrase and con- tents of chlorophylls, total carbohydrates and soluble proteins were de- termined. In Tectona grandis, significant effects of CO2 supply were found on chlorophylls, root-shoot allometric ratio and seedling quality index. Ailanthus excelsa showed significant effect on only the shoot characteristics on exposure to elevated CO2 but the root characteristics and concentrations of chlorophylls were not significantly different. Ca- suarina equisetifolia also showed significant effects on exposure to ele- vated CO2 in terms of shoot characteristics and concentrations of chlo- rophylls. Total sugars, the major photosynthates, did not show any sig- nificant variation to elevated CO2 in any of the three species. Carbonic anhydrase, the key enzyme responsible for transfer of CO2 into the tis- sues significantly increased in all three species. Overall, all the variables responded to elevated CO2, reflecting the positive effects of one parame- ter of climate change conditions on seedling quality. A positive response of these three plantation species to elevated CO2 content is a good indi- cation for their future existence in potentially changed climatic eonditions.

关键词： Plantation Elevated CO2 Tropical trees India Carbonicanhydrase

Screening Azadirachta indica tree for enhancing azadirachtin and oil contents in dry areas of Gujarat,India

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Journal of forestry Research 2011年第2期22卷 217-224页

作者： U.K.Tomar G.Singh N.Kaushik forest genetics and tree breeding Division Arid Forest Research Institute forest Ecology Division Arid Forest Research Institute Bioresources and Biotechnology Division TERIHabitat Place

Azadirachta indica seed samples were collected from four different agro-ecological regions（AERs） viz.,AER-2,AER-4,AER-5A and AER-5B of Gujarat state,India during 2000 to 2002 with an aim to assess variability in azadirachtin,oil and fatty acids content of the seeds and assess correlation of these parameters with morphological ***,oil and fatty acids content indicated significant（p0.01） variations between years and AERs in *** azadirachtin ranged from 142 to 9 527 μg·g-1 seed kernel with an average of 2 426 μg·g-1 for the ***-5B recorded highest azadirachtin and oil *** acid composition was found to be affected by environmental factors particularly varying degree of annual rainfall and temperature during fruit ripening *** trees growing in AER-5B performed better in term of azadirachtin,oil and stearic acid *** girth at breast height showed no significant relation with these biochemicals.

关键词： agro-ecological zones fatty acids girth-class neem seed variability

Estimation of genetic parameters on growth characteristics of a 35-year-old Pinus koraiensis progeny trial in South Korea

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Journal of forestry Research 2021年第5期32卷 2227-2236页

作者： Kyungmi Lee In Sik Kim Seok Woo Lee Division of forest tree Improvement Department of Forest BioresourcesNational Institute of Forest ScienceSuwonRepublic of Korea

The effects of genetic and environmental factors on Pinus koraiensis growth were studied based on a35 year-old progeny trial composed of open-pollinated offspring of twenty-one plus ***,DBH and volume of the offspring was analyzed using restricted maximum likelihood/best linear unbiased prediction in mixed model *** site and family effects on the three traits were *** distinct growth of offspring by site with disparate climates corroborated the importance of planting species in suitable *** differences by family was significant,emphasizing the importance of identifying families with either superior or inferior *** parental ranking was assigned in the sites,inferring the breeding value of each plus *** estimates of individual heritability(h_(i)^(2))of height,DBH and volume growth were 0.169-0.645,0.108-0.331 and 0.129-0.343 respectively,with higher h_(i)^(2) of the height than DBH on each *** of variance of genetic effect was higher with DBH in some cases,indicating the scope for selection is larger for this trait despite the lower heritability compared to *** the variation between families in terms of the performance stability across sites,consideration of the genotype by environment interaction is required in selecting materials to be used in reforestation with Korean pine.A few families with either superior or inferior performance retained their parental ranking for at least a *** families with increased growth on a particular site were identified,indicating their high breeding value and low *** in the genetic performance of the families by site requires delineation of the breeding region of the species.

关键词： Pinus koraiensis Genetic parameters Genotype by environment interaction tree improvement Progeny trial

Identification and Characterization of the Populus AREB/ABF Subfamily

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Journal of Integrative Plant Biology 2013年第2期55卷 177-186页

作者： Lexiang Ji Jia Wang Meixia Ye Ying Li Bin Guo Zhong Chen Hao Li Xinmin An National Engineering Laboratory for tree breeding NDRC Key Laboratory of genetics and breeding in forest trees and Ornamental Plants MOE The tree and Ornamental Plant breeding and Biotechnology Laboratory SFA College of Biological Sciences and Biotechnology Beijing Forestry University

Abscisic acid （ABA） is a major plant hormone that plays an important role in responses to abiotic stresses. The ABA-responsive element binding protein/ABRE-binding factor （AREB/ABF） gene subfamily contains crucial transcription factors in the ABA-mediated signaling pathway. In this study, a total of 14 putative AREB/ABF members were identified in the Populus trichocarpa Torr. ＆ Gray. genome using five AREB/ABF amino acid sequences from Arabidopsis thaliana L. as probes. The 14 putative Populus subfamily members showed high protein similarities, especially in the basic leucine zipper （bZIP） domain region. A neighbor-joining analysis combined with gene structure data revealed homology among the 14 genes. The expression patterns of the Populus AREB/ABF subfamily suggested that the most abundant transcripts of 11 genes occurred in leaf tissues, while two genes were most transcribed in root tissues. Significantly, eight Populus AREB/ABF gene members were upregulated after treatment with 100 t^M exogenous ABA, while the other six members were downregulated. We identified the expression profiles of the subfamily members in Populus tissues and elucidated different response patterns of Populus AREB/ABF members to ABA stress. This study provided insight into the roles of Populus AREB/ABF homologues in plant response to abiotic stresses.

关键词： Arabidopsis thafiana Populus AREB/ABF bioinformatics qRT-PCR.

Genetic structure of needle morphological and anatomical traits of Pinus yunnanensis

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Journal of forestry Research 2016年第1期27卷 13-25页

作者： Yujie Huang Jianfeng Mao Zhiqiang Chen Jingxiang Meng Yulan Xu Anan Duan Yue Li National Engineering Laboratory for forest tree breeding Key Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants of Ministry of Education College of Biological Sciences and Technology Beijing Forestry University Key Laboratory for forest Resources Conservation and the Southwest Mountains of China Ministry of Education Southwest Forestry University

Pinus yunnanensis Franch. is an particular conifer tree species in Yunnan-Guizhou plateau in south- west China. The morphological and anatomical traits of needles are important to evaluate geographic variation and population dynamics of conifer species. Seedlings from seven populations of P. yunnanensis were analyzed, look- ing at 22 morphological and anatomical needle traits. The results showed that variations among and within popula- tions were significantly different for all traits and the variance components within populations were generally higher than that among populations in the most tested needle traits. The proportions of three-needle fascicle were significantly different among populations. The traits related to needle size in both morphology and anatomy were positive with latitude and negative with annual temperature and precipitation. Ratio indices, including mesophyllarea/vascular bundle area, mesophyll area/resin canals area, vascular bundle area/resin canals area and mesophyU area/（resin canals area and vascular bundle area）, were negatively correlated with elevation and positively corre- lated with the annual mean temperature, showing some fitness feature for the populations. Needle traits were more significantly correlated with longitude than with other four environmental factors. Needle length was significantly correlated with almost all environmental factors. First four principal components accounted for 81.596 % of the variation with eigenvalues 〉1; the differences among populations were mainly dependent on needle width, stomatal density, section areas of vascular bundle, total resin canals, and mesophyll, as well as area ratio traits. Seven populations were divided into three categories by Euclidean distance. Variations in needle traits among the populations have shown systematic microevolution in terms of geographic impact on P. yunnanensis. This study would provide empirical data to characterize adaptation and genetic variation of P. yunnanens

关键词： Genetic structure Needle Morphologicaland anatomical traits Geographic population Pinusyunnanensis

Function identification of miR159a,a positive regulator during poplar resistance to drought stress

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Horticulture Research 2023年第12期10卷 120-136页

作者： Tiantian Fu Chun Wang Yuzhang Yang Xiaoqian Yang Jing Wang Lichun Zhang Zeqi Wang Yanwei Wang State Key Laboratory of tree genetics and breeding National Engineering Research Center of Tree Breeding and Ecological RestorationKey Laboratory of Genetics and Breeding in Forest Trees and Ornamental PlantsMinistry of EducationThe Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland AdministrationCollege of Biological Sciences and BiotechnologyBeijing Forestry UniversityBeijing 100083China

Drought seriously affects the growth and development of ***159 is a highly conserved and abundant microRNA family that plays a crucial role in plant growth and stress ***,studies of its function in woody plants are still ***,the expression of miR159a was significantly upregulated after drought treatment in poplar,and the overexpression of miR159a(OX159a)significantly reduced the open area of the stomata and improved water-use efficiency in *** drought treatment,OX159a lines had better scavenging ability of reactive oxygen species and damage of the membrane system was less than that in wild-type *** was the target gene of miR159a,as verified by psRNATarget prediction,RT-qPCR,degradome sequencing,and 5′rapid amplification of cDNA ends(5′RACE).Additionally,miR159a-short tandem target mimic suppression(STTM)poplar lines showed increased sensitivity to drought *** analysis comparing OX159a lines with wild-type lines revealed upregulation of a series of genes related to response to water deprivation and metabolite ***,drought-responsive miR172d and miR398 were significantly upregulated and downregulated respectively in OX159a *** investigation demonstrated that miR159a played a key role in the tolerance of poplar to drought by reducing stomata open area,increasing the number and total area of xylem vessels,and enhancing water-use efficiency,and provided new insights into the role of plant miR159a and crucial candidate genes for the molecular breeding of trees with tolerance to drought stress.

关键词： poplar breeding drought

Evaluation of seed production in a first-generation seed orchard of Chinese pine (Pinus tabuliformis)

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Journal of forestry Research 2016年第5期27卷 1003-1008页

作者： Huwei Yuan Shihui Niu Xianqing Zhou Qingping Du Yue Li Wei Li National Engineering Laboratory for forest tree breeding Key Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants of Ministry of Education College of Biological Sciences and Technology Beijing Forestry University Beijing 100083 China Qigou State-owned forest Farm Pingquan 067509 HebeiChina Huixian State-owned forest Farm Xinxiang 453636 HenanChina

We evaluated seed production in a first-gener- ation orchard of Chinese pine （Pinus tabuliformis） during the crucial transition period from first generation to advanced generations. Clones varied significantly in all traits related to seed production. Repeatability of these traits ranged from 0 to 0.96. Seed production per ramet （SPPR）, seed producing index （SPI）, the number of relative female strobili （RFS）, the number of scales, and the num- ber of ineffective scales had comparatively high repeata- bility at 0.86, 0.87, 0.89, 0.96, and 0.91, respectively. Correlation analysis showed that SPPR was greatly influenced by RFS and by the number of full seeds per cone. Finally, we showed that SPI was the best predictor of the seed-producing ability of clones. Our findings will assist seed orchard managers in effectively predicting and improving seed production of Chinese pine seed orchards.

关键词： Chinese pine tabuliformis. Seed orchard Cone Heritability Pinus Seed production