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Hsi W, Huang Z, Wang W, Sheng Y, Deng Y. SU-E-T-281: Dose Measurements of Modulated Spot-Scanning Particle Beams with Beam-Gating of Respiratory-Phase. Med Phys 2015. [DOI: 10.1118/1.4924643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Sheng Y, Li T, Yin F, Wu Q. SU-E-T-434: Fixed Margin Or Online Adaptation for Intermediate-Risk Prostate Stereotactic Body Radiation Therapy? A Dosimetric Study. Med Phys 2015. [DOI: 10.1118/1.4924795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Hsi W, Li Y, Huang Z, Sheng Y, Deng Y, Zhao J, Zhao F, Sun L, Moyers M. MO-F-CAMPUS-T-04: Utilization of Optical Dosimeter for Modulated Spot-Scanning Particle Beam. Med Phys 2015. [DOI: 10.1118/1.4925479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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79
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Shvedov V, Karpinski P, Sheng Y, Chen X, Zhu W, Krolikowski W, Hnatovsky C. Visualizing polarization singularities in Bessel-Poincaré beams. OPTICS EXPRESS 2015; 23:12444-12453. [PMID: 25969330 DOI: 10.1364/oe.23.012444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We demonstrate that an annulus of light whose polarization is linear at each point, but the plane of polarization gradually rotates by π radians can be used to generate Bessel-Poincaré beams. In any transverse plane this beam exhibits concentric rings of polarization singularities in the form of L-lines, where the polarization is purely linear. Although the L-lines are invisible in terms of light intensity variations, we present a simple way to visualize them as dark rings around a sharp peak of intensity in the beam center. To do this we use a segmented polarizer whose transmission axes are oriented differently in each segment. The radius of the first L-line is always smaller than the radius of the central disk of the zero-order Bessel beam that would be produced if the annulus were homogeneously polarized and had no phase circulation along it.
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Li J, Shao Z, Yang S, Jiang J, Wang C, Liu Y, Fu P, Pang D, Sheng Y. P082 CBCSG-10, the addition of capecitabine to adjuvant chemotherapy in triple-negative breast cancer. Breast 2015. [DOI: 10.1016/s0960-9776(15)70127-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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81
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Cui L, Li G, Zhong W, Bian Y, Su S, Sheng Y, Shi Y, Wei D, Zhang W, Zhao H, Chen ZJ. Polycystic ovary syndrome susceptibility single nucleotide polymorphisms in women with a single PCOS clinical feature. Hum Reprod 2015; 30:732-6. [DOI: 10.1093/humrep/deu361] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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Guo L, Zhang W, Sheng Y, Chen K, Shi Q, Zhang P, Zhang R. Expression and significance of LRIG3 in human cervical squamous cell carcinoma. EUR J GYNAECOL ONCOL 2015; 36:414-419. [PMID: 26390694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To explore the effect of LRIG3 in the development of cervical squamous cell carcinoma. MATERIALS AND METHODS LRIG3 and epidermal growth factor receptor (EFGR) expressions were detected by immunohistochemistry. Western blot method was used to detect LRIG3 and EGFR protein expression at different time points. MTT, flow cytometry, and transwell chamber were adopted to examine the proliferation, apoptosis, and strength of invasion of Hela229 cell respectively. RESULTS During the process of normal cervix deteriorating into CIN and CSCC, LRIG3 expression gradually decreased, while EGFR increased. After the transfection of LRIG3 ASODN into cells, the amount of LRIG3 expression and the cell apoptosis rate both decreased gradually, EGFR protein expression and cell proliferation rate both increased (p < 0.05), other groups remained unchanged (p > 0.05). The cell migration ability in LRIG3 ASODN transfection group was stronger than that of other groups (p < 0.05). CONCLUSION LRIG3 plays an important role in Hela229 cell proliferation, apoptosis, and invasiveness.
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Zou C, Chen J, Chen K, Wang S, Cao Y, Zhang J, Sheng Y, Huang A, Tang H. Functional analysis of miR-181a and Fas involved in hepatitis B virus-related hepatocellular carcinoma pathogenesis. Exp Cell Res 2014; 331:352-61. [PMID: 25449696 DOI: 10.1016/j.yexcr.2014.11.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 11/12/2014] [Accepted: 11/13/2014] [Indexed: 01/05/2023]
Abstract
The hepatitis B virus (HBV) is responsible for most of hepatocellular carcinoma (HCC). However, whether HBV plays an important role during hepatocarcinogenesis through effecting miRNAs remains unknown. Here, we reported that HBV up-regulated microRNA-181a (miR-181a) by enhancing its promoter activity. Simultaneously, we found that miR-181a inhibited apoptosis in vitro and promoted tumor cell growth in vivo. TNF receptor superfamily member 6 (Fas) was further identified as a target of miR-181a. We also found that Fas could reverse the apoptosis-inhibition effect induced by miR-181a. Moreover, HBV could inhibit cell apoptosis by down-regulating Fas expression, which could be reversed by miR-181a inhibitor. Our data demonstrated that HBV suppressed apoptosis of hepatoma cells by up-regulating miR-181a expression and down-regulating Fas expression, which may provide a new understanding of the mechanism in HBV-related HCC pathogenesis.
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84
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Li T, Sheng Y, Lee W, Wu Q. SBRT for Prostate + Seminal Vesicles: Fixed Margin or Online Adaptation. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.106] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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85
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Zhang Y, Chen Y, Chen Z, Zhou Y, Sheng Y, Xu D, Wang Y. Effects of Bronchoalveolar Lavage on Refractory Mycoplasma pneumoniae Pneumonia. Respir Care 2014; 59:1433-9. [DOI: 10.4187/respcare.03032] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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86
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Du Y, Su Y, He J, Yang Y, Shi Y, Cui Y, Luo C, Wu X, Liu X, Hu F, Ma X, Zheng L, Zhang J, Zuo X, Sheng Y, Wu L, Chen X, Gao Y, Zhang X, Guo J, Li Z. OP0216 The Functional Rather than Nonfunctional LILRA3 Contributes to Susceptibility and Subphenotypes of Systemic Lupus Erythematosus and SjÖGren's Syndrome. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.2106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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87
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Sheng Y, Li T, Yin F, Ge Y, Wu Q. SU-E-J-177: Understanding the Seminal Vesicle's Motion Relative to the Prostate: Range and Pattern. Med Phys 2014. [DOI: 10.1118/1.4888230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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88
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Li T, Yuan L, Sheng Y, Wu Q. TH-A-9A-10: Prostate SBRT Delivery with Flattening-Filter-Free Mode: Benefit and Accuracy. Med Phys 2014. [DOI: 10.1118/1.4889580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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89
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Yuan L, Ge Y, Yin F, Li Y, Sheng Y, Wu QJ. SU-E-T-49: Automatic Beam Angle Determination for Lung IMRT Planning Using a Beam Configuration Atlas. Med Phys 2014. [DOI: 10.1118/1.4888379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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90
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Sheng Y, Li T, Zhang Y, Yin F, Ge Y, Wu Q. MO-C-17A-07: Building Atlas for Automatic Prostate IMRT Planning: Anatomical Feature Parameterization and Classification. Med Phys 2014. [DOI: 10.1118/1.4889130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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91
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Sheng Y, Li J, Zou C, Wang S, Cao Y, Zhang J, Huang A, Tang H. Downregulation of miR-101-3p by hepatitis B virus promotes proliferation and migration of hepatocellular carcinoma cells by targeting Rab5a. Arch Virol 2014; 159:2397-410. [PMID: 24788845 DOI: 10.1007/s00705-014-2084-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Accepted: 04/08/2014] [Indexed: 01/27/2023]
Abstract
RAB GTPase 5A (RAB5A), a member of the Rab subfamily of small GTPases, acts as an oncogene and has been associated with various key cellular functions, including cell growth, differentiation, apoptosis and angiogenesis. Recently, it has been reported that the Rab5a gene is involved in the progression of cancer. Hepatocellular carcinoma (HCC) is one of the most common and aggressive cancers, and it is usually associated with persistent hepatitis B virus (HBV) infections. Emerging evidence suggests that HBV alters microRNA (miRNA) expression profiles, but the mechanisms underlying this process have not yet been fully elucidated. Here, we examine how HBV affects the production of miR-101-1, which has been shown to be downregulated in HCC. We found that HBV could repress miR-101-3p by inhibiting its promoter activity. Downregulation of miR-101-3p promoted cancer cell growth and migration, and a specific miR-101-3p inhibitor was able to enhance proliferation and migration. Moreover, we identified Rab5a was one of the target genes of miR-101-3p in HBV-related HCC. Forced expression of miR-101-3p in liver cell lines resulted in a marked reduction of the expression of Rab5a at both the mRNA and protein level by directly targeting the 3'untranslated region of Rab5a. Overexpression of Rab5a resulted in a reversal of the suppression of proliferation and migration of SMMC-7721 cells mediated by miR-101-3p. Taken together, our data show that HBV can downregulate miR-101-3p expression by inhibiting its promoter activity and that downregulation of miR-101-3p promotes HCC cell proliferation and migration by targeting Rab5a. This provides new insights into the mechanisms of HBV-related HCC pathogenesis.
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Sheng Y, Ding S, Chen K, Chen J, Wang S, Zou C, Zhang J, Cao Y, Huang A, Tang H. Functional analysis of miR-101-3p and Rap1b involved in hepatitis B virus-related hepatocellular carcinoma pathogenesis. Biochem Cell Biol 2014; 92:152-62. [PMID: 24697700 DOI: 10.1139/bcb-2013-0128] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
MicroRNA-101(miR-101) has been shown to be down-regulated in hepatocellular carcinoma (HCC). The hepatitis B virus (HBV) is a major risk factor in the development and progression of HCC. However, the correlation between HBV and miR-101 has not yet been fully elucidated. In this study, we reported that HBV could repress miR-101-3p by inhibiting its promoter activity and identified the potential effects of miR-101-3p on some important biological properties of HCC cells by targeting Rap1b. Dual-luciferase reporter assays showed that HBV down-regulated miR-101-3p by inhibiting its promoter activity. Down-regulation of miR-101-3p promoted cell proliferation, migration, and reduced apoptosis, and resulted in up-regulation of Rap1b, while overexpression of miR-101-3p inhibited these processes. Moreover, overexpression of Rap1b was able to reverse the suppressed cell proliferation and migration mediated by miR-101-3p. Our data showed that HBV down-regulated miR-101-3p expression by inhibiting its promoter activity, which resulted in up-regulation of Rap1b, and down-regulation of miR-101-3p or up-regulation of Rap1b promoted proliferation and migration of HCC cells. This provides a new understanding of the mechanism of HBV-related HCC pathogenesis and the potential application of miR-101-3p in cancer therapy.
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Zou C, Li Y, Cao Y, Zhang J, Jiang J, Sheng Y, Wang S, Huang A, Tang H. Up-regulated MicroRNA-181a induces carcinogenesis in hepatitis B virus-related hepatocellular carcinoma by targeting E2F5. BMC Cancer 2014; 14:97. [PMID: 24529171 PMCID: PMC3930291 DOI: 10.1186/1471-2407-14-97] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 02/11/2014] [Indexed: 12/17/2022] Open
Abstract
Background Accumulating evidence showed that microRNAs are involved in development and progression of multiple tumors. Recent studies have found that miR-181a were dysregulated in several types of cancers, however, the function of miR-181a in hepatocellular carcinoma (HCC) remains unclear. In this study we assessed the potential association between miR-181a, HBV and HCC. Methods The expression of miR-181a in HBV-expressing cells was determined by using qRT-PCR. Dual-Luciferase reporter Assay, qRT-PCR and western blot were performed to investigate the target genes of miR-181a. The effects of miR-181a on HCC proliferation were analyzed by MTS and colony formation assay. Tumor growth assay was used to analyze the effect of miR-181a on tumor formation. Results HBV up-regulated miR-181a expression by enhancing its promoter activity. Overexpression of miR-181a in hepatoma cells promoted cell growth in vitro and tumor formation in vivo. Conversely, inhibition of miR-181a suppressed the proliferation of HBV-expressing cells. Mechanism investigation revealed that miR-181a inhibited the expression of transcription factor E2F5 by specifically targeting its mRNA 3′UTR. Moreover, E2F5 inhibition induced cell growth and rescued the suppressive effect of miR-181a inhibitor on the proliferation of SMMC-7721 cells. Interestingly, we also discovered that HBV could down-regulate E2F5 expression. Conclusions Those results strongly suggested that HBV down-regulated E2F5 expression, in part, by up-regulating the expression of miR-181a. Up-regulation of miR-181a by HBV in hepatoma cells may contribute to the progression of HCC possibly by targeting E2F5, suggesting miR-181a plays important role in HCC development.
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Xu XQ, Zu QQ, Lu SS, Cheng QG, Yu J, Sheng Y, Shi HB, Liu S. Use of FLAIR imaging to identify onset time of cerebral ischemia in a canine model. AJNR Am J Neuroradiol 2014; 35:311-6. [PMID: 23928141 DOI: 10.3174/ajnr.a3689] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Stroke is a leading cause of death and disability, and many studies have focused on the evolution of FLAIR imaging in the acute and chronic time window. The purpose of this study was to evaluate the potential efficacy of FLAIR-related techniques in identifying the onset time of cerebral ischemia in a canine embolic stroke model. MATERIALS AND METHODS An embolic ischemic model was generated through the use of an autologous clot in 20 beagle dogs. Both FLAIR and DWI were performed at 3 hours, 4 hours, 5 hours, 6 hours, and 24 hours after embolization, respectively. Visual "DWI-FLAIR mismatch" was defined as hyperintense signal detected on DWI but not on FLAIR. The relative signal intensity of FLAIR-positive lesions and the degree of DWI-FLAIR mismatch was calculated as relative FLAIR = relative signal intensity of FLAIR positive lesions, mismatch degree = (100-VFLAIR/VDWI) × 100%. RESULTS The ischemic model was successfully established in all animals. FLAIR-positive lesions were seen in 3, 11, 16, 19, and 20 beagle dogs at 5 time points after embolization, respectively. There was significant correlation between the relative FLAIR, degree of DWI-FLAIR mismatch, and the onset time (relative FLAIR: r = +0.42; 95% CI, 0.20-0.60; mismatch degree: r = -0.85; 95% CI, 0.89-0.78). Receiver operating characteristic curves showed that the degree of DWI-FLAIR mismatch could identify the hyperacute ischemic lesions with a sensitivity range from 1.00-0.76; visual DWI-FLAIR mismatch sensitivity ranged from 0.85-0.39, whereas specificity was 0.83-0.95 versus 0.85-1.00. CONCLUSIONS The relative FLAIR and DWI-FLAIR mismatch values were useful in predicting the onset time in our canine embolic stroke model. The degree of DWI-FLAIR mismatch proposed in our study could be a good indicator with high sensitivity for identifying the hyperacute ischemic stroke.
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Miao Y, Kang Z, Xu F, Qi S, Sheng Y, Han Y, Hu R, Guo X, Yang Q. Association analysis of the IL2RA gene with alopecia areata in a Chinese population. Dermatology 2013; 227:299-304. [PMID: 24280705 DOI: 10.1159/000351555] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Accepted: 04/12/2013] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Interleukin-2 receptor subunit alpha (IL2RA) is highly expressed on CD4+CD25+ regulatory T cells and is important for immune homeostasis and the suppression of autoimmune responses. It has been suggested that the single nucleotide polymorphism in IL2RA may affect the pathogenesis of alopecia areata (AA). OBJECTIVE Our aim was to investigate the link between IL2RA polymorphism and AA in a Chinese population. METHODS We examined 427 patients and 430 controls in this study. The rs3118470 polymorphism was evaluated using high-resolution melting analysis and direct sequencing. RESULTS The prevalence of the C/C, T/C and T/T genotypes was 16.2, 48.2 and 35.6%, respectively. The genotype distribution and allele frequencies were significantly different between AA and control subjects (p < 0.0001). The C allele frequency was significantly higher in the AA group (p < 0.0001), and the frequencies of C allele and C/C genotype were higher in the patients with family history (p = 0.034; p < 0.0001). CONCLUSIONS The rs3118470 single nucleotide polymorphism of IL2RA may be a genetic marker to assess the risk of AA in a Chinese population.
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Sheng Y, Qiu Z, He Y, Zhang Y. QUALITY OF LIFE AMONG END-OF-LIFE FORMER COMMERCIAL PLASMA DONORS INFECTED WITH HIV IN RURAL HENAN, CHINA. BMJ Support Palliat Care 2013. [DOI: 10.1136/bmjspcare-2013-000491.159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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97
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Sheng Y, Li T, Yuan L, Yin F, Wu Q. TH-C-137-11: Dose-Guided Automatic IMRT Planning: A Feasibility Study. Med Phys 2013. [DOI: 10.1118/1.4815754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Li K, Ding S, Chen K, Qin D, Qu J, Wang S, Sheng Y, Zou C, Chen L, Tang H. Hepatitis B Virus X Protein Up-Regulates AKR1C1 Expression Through Nuclear Factor-Y in Human Hepatocarcinoma Cells. HEPATITIS MONTHLY 2013; 13:e8792. [PMID: 24003325 PMCID: PMC3753552 DOI: 10.5812/hepatmon.8792] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 01/05/2013] [Accepted: 01/20/2013] [Indexed: 12/11/2022]
Abstract
BACKGROUND The hepatitis B virus X (HBx) protein has long been recognized as an important transcriptional transactivator of several genes. Human aldo-keto reductase family 1, member C1 (AKR1C1), a member of the family of AKR1CS, is significantly increased in HBx-expressed cells. OBJECTIVES This study aimed to investigate the possible mechanism of HBx in regulating AKR1C1 expression in HepG2.2.15 cells and the role of AKR1C1 for HBV-induced HCC. MATERIALS AND METHODS RT-PCR was performed to detect AKR1C1 expression on mRNA level in HepG2 and HepG2.2.15 cell. The promoter activity of AKR1C1 was assayed by transient transfection and Dual-luciferase reporter assay system. The AKR1C1 promoter sequence was screened using the TFSEARCH database and the ALIBABA 2.0 software. The potential transcription factors binding sites were identified using 5' functional deletion analysis and site-directed mutagenesis. RESULTS In this study, we found that HBx promoted AKR1C1 expression in HepG2.2.15 cells. Knockdown of HBx inhibited AKR1C1 activation. The role of HBx expression in regulating the promoter activity of human AKR1C1 gene was analyzed. The 5'functional deletion analysis identified that the region between -128 and -88 was the minimal promoter region of HBx to activate AKR1C1 gene expression. Site-directed mutagenesis studies suggested that nuclear factor-Y (NF-Y) plays an important role in this HBx-induced AKR1C1 activation. CONCLUSIONS In HepG2.2.1.5 cell, HBx can promote AKR1C1 promoter activity and thus activates the basal transcription of AKR1C1 gene. This process is mediated by the transcription factor NF-Y. This study explored the mechanism for the regulation of HBV on AKR1C1 expression and has provided a new understanding of HBV-induced HCC.
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Qin D, Li K, Qu J, Wang S, Zou C, Sheng Y, Huang A, Tang H. HBx and HBs regulate RhoC expression by upregulating transcription factor Ets-1. Arch Virol 2013; 158:1773-81. [DOI: 10.1007/s00705-013-1655-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Accepted: 02/01/2013] [Indexed: 10/27/2022]
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Li J, Yu B, Zhao C, Nowak RS, Zhao Z, Sheng Y, Li J. Physiological and morphological responses of Tamarix ramosissima and Populus euphratica to altered groundwater availability. TREE PHYSIOLOGY 2013; 33:57-68. [PMID: 23243028 DOI: 10.1093/treephys/tps120] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Riparian plants in arid areas are subject to frequent hydrological fluctuations induced through natural flow variation and water use by humans. Although many studies have focused on the success of Tamarix ramosissima Ledeb. in its invaded ranges, its major competitor in its home range, Populus euphratica Oliv., historically has dominated riparian forests where both species occur naturally. Thus, identifying ecophysiological differences between T. ramosissima and its co-evolved competitor under varying hydrological conditions may help us understand how flow regimes affect dominance in its home range and promote invasion in new ranges. We examined ecophysiological responses of T. ramosissima and P. euphratica, which are both native to the Tarim River Basin, northwest China, to experimental alterations in groundwater. Seedlings of both species were grown in lysimeters, first under well-watered conditions and then exposed to different groundwater treatments: inundation, drought, and relatively shallow, moderate and deep groundwater. Under inundation, T. ramosissima showed little growth whereas P. euphratica died after ~45 days. Droughted seedlings of both species suffered from considerable water stress evidenced by slow growth, decreased total leaf area and specific leaf area, and decreased xylem water potential (ψ), maximum photosynthetic rate and carboxylation efficiency. Both species had better ecophysiological performances under shallow and moderate groundwater conditions. When groundwater declined below rooting depth, seedlings of both species initially experienced decreased ψ, but ψ of T. ramosissima recovered late in the experiment whereas P. euphratica maintained decreased ψ. This ability of T. ramosissima to recover from water deficit might result from its rapid root elongation and subsequent ability to acquire groundwater, which in turn likely provides ecophysiological advantages over P. euphratica. Our results suggest that recent groundwater declines along the Tarim River could facilitate T. ramosissima more due to its rapid response to changed groundwater availability. This trait may also help the success of T. ramosissima as it invaded riparian ecosystems in southwestern USA.
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