共查询到20条相似文献，搜索用时 46 毫秒
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宣化块菌(Tuber xuanhuaense)是2016年被报道的隶属于块菌科、块菌属的一个新物种,在发表新种时,宣化块菌子囊果包被结构被描述为疏丝组织,该组织被认为是该物种的鉴别特征之一。对近年(2016～2017)采集到该物种的22份标本研究发现,宣化块菌的包被结构在完全成熟时分化为两层,外层为拟薄壁组织,内层为疏丝组织。本研究依据模式标本和22份新采集的标本对宣化块菌的形态特征进行了修订描述,同时本研究显示宣化块菌是块菌属在中国华北地区最常见的物种之一,秋季常见于桦木(Betula spp.)、栎树(Quercus spp.)、松树(Pinus spp.)林地下土壤中。 相似文献
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印度块菌(Tuber indicum Vittadini)、夏块菌(T.aestivum Vittadin)i是经济价值较高的菌根食用菌。本文对印度块菌、夏块菌与化香树(Platycarya strobilacea Sieb.et Zucc).合成菌根苗的技术进行了研究,结果表明用印度块菌、夏块菌孢子液接种化香树苗后,第三个月发现已形成根尖淡乳色,基部淡黄色、黄褐色的外生菌根。外生菌根为单轴状、羽状和不规则分支状,单根菌根长300μm~4 000μm,直径为200μm~500μm;平坦或从菌根延伸出外延菌丝。印度块菌与化香树形成的外延菌丝为透明、半透明、絮状。夏块菌与化香树形成的外延菌丝为黄绿色、羊毛状。菌根老化后变暗褐或萎缩;两种块菌与化香树形成的菌根在显微镜下有明显的差别。 相似文献
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块菌生态学特性的初步研究 总被引：5，自引：0，他引：5
本文研究了块菌的形态特征、发生期以及块菌生长发育与气候、土壤、动植物的关系。块菌是营养共生型的外生菌根菌,与树木形成共生关系,与周围杂草有拮抗关系。块菌最适合生长于中性至微碱性的表面覆有腐殖质层的轻、中壤中。块菌产地雨季和热季同季,干、湿季明显。生长季节地温19～26℃,雨量900～950mm。 相似文献
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《食用菌学报》2020,(2)
块菌(true truffle)是一类重要的大型子囊菌,很多物种具有较高的食用价值,受到全世界关注。中国的块菌资源和物种多样性丰富,但近年来受过度采挖、气候变化等因素的影响,块菌资源面临着较大威胁。在2018年发布的《中国生物多样性红色名录——大型真菌卷》基础上,对块菌科5个受威胁物种-巨孢奇块菌(Paradoxa gigantospora)、会东块菌(Tuber huidongense)、印度块菌(T.indicum)、攀枝花块菌(T.panzhihuanense)和中华夏块菌(T.sinoaestivum)的形态学特征、分布及资源现状等进行介绍,同时提供19个近危物种的简要信息,并分析该类群目前的受威胁和保护现状,作为对大型真菌红色名录的必要补充。鉴于现实的状况,建议对我国的块菌资源开展全面调查研究,选定监测点监测种群动态,以保护这一类重要的菌物资源,实现对资源的可持续利用。 相似文献
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《食用菌学报》2015,(1)
在中国西南地区的野生食用菌市场上,一类与印度块菌复合群(Tuber indicum complex)形态相近的黑块菌,一直倍受人们的关注。此种"黑块菌"即为以前在我国曾报道记载过的夏块菌(T.aestivum)。2009年,笔者采到其子实体,通过形态学及nrDNA-ITS序列的比对和分析,发现中国的夏块菌与欧洲夏块菌不是同一个种,为姊妹种关系,并命名为中华夏块菌(Tuber sinoaestivum)。在本文中,笔者对其生态环境包括土壤、海拔、共生树种、地理分布等进行了调查分析。结果表明,中华夏块菌主要发生在海拔1800~2800m的亚热带针叶林下的弱碱性(pH 7~8)、疏松钙质的土壤中,与华山松(Pinus armandii)形成菌根,为共生关系。在云南大理、丽江、保山、昭通等地野生菌市场时有发现其踪迹;但迄今为止,仅在四川省境内的会东县采集到自然状态下的子囊果;故而,其自然地理分布情况不详。 相似文献
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《中国食用菌》2017,(4)
印度块菌(Tuber indicum Vittadini)、夏块菌(Tuber aestivum Vittadini)和白块菌(Tuber panzhihuanense DengWang)是经济价值较高的菌根食用菌。通过对印度块菌、夏块菌和白块菌与板栗(Castanea mollissima Blume)合成菌根苗的技术进行探讨,结果表明使用印度块菌、夏块菌和白块菌孢子液接种板栗树苗,10个月后均能形成大量外生菌根。菌根苗移栽后,接种夏块菌的板栗苗苗高最高,与接种白块菌和印度块菌的板栗苗相比高差异显著,但接种白块菌的板栗苗与接种印度块菌的板栗苗相比苗高差异不显著。接种夏块菌的板栗苗与接种白块菌板栗苗间地径差异不显著,二者与接种印度块菌的板栗苗间地径差异均显著。 相似文献
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AIM: Although endovascular radiotherapy inhibits neointimal hyperplasia, the exact alterations induced by β-particles irradiation remain to be elucidated. The objective of this study was to investigate the ability and the cellular mechanism of local β-particles emission from 188Re to inhibit vascular smooth muscle cells (SMCs). METHODS: The SMCs in vitro were irradiated by 188Re with single doses of 2.6 Gy-25.8 Gy. The effects of β-particles on SMCs, such as effective irradiate doses, the period of inhibition for SMCs proliferation, the changes of cell proliferation rate and DNA synthesis rate, cell cycle progression and related gene expression, were investigated by cell count, [3H]-TdR incorporation, cell cycle progression analysis, cell viability and immunocytochemistry, respectivecy. RESULTS: β-particles irradiation with dose of 5.2 Gy could inhibit significantly SMCs proliferation. At dose of 20.6 Gy DNA synthesis inhibitory rate was 92%, SMCs proliferation rate was only 3%. Renoval of 188Re did not abolish the inhibitory effects of β-particles on SMCs proliferation. The expression of P53 was up regulation and PCNA was down regulation after irradiation. CONCLUSION: β-particles from 188 Re was significantly effective and permanent in inhibiting SMCs proliferation, and inhibitory effect was in dose-dependet manner ED50was 5 Gy, the best dose to inhibit SMCs proliferation was 20 Gy. β-particles irradiation induced SMCs to occur G0/G1 arrest, damaged the ability of SMCs reproliferation and led to cell clonogenic death. P53 and PCNA had regulatiory effects on SMCs proliferation after β-particles irradiation. 相似文献
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AIM:To study the effect of L-Arg on plasma content of endothelin (ET) and the expression of proto-oncogene c-fos mRNA in the left ventricle of rats with renovascular hypertensive hypertrophy. METHODS: The level of c-fos mRNA were measured by in situ hybridization. The ET in plasma were measured by radioimmunoassay. RESULTS:After eight weeks of treatment with L-Arg, the expression of c-fos decreased markedly (P＜0.01). The ET content in plasma also decreased significantly by L-Arg(P＜0.01).CONCLUSION: Plasma ET content and the expression of c-fos in the left ventricle of rats with renovascular hypertensive hypertrophy could be decreased by L-Arg administration. 相似文献
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《International Journal of Fruit Science》2013,13(3):101-120
Abstract Saskatoon berry (Amelanchier alnifolia Nutt., Rosaceae) and blueberry (Vaccinium corymbosum L., Ericaceae) are substantially equivalent in all characteristics that are important to the consumer, including fruit color, shape, size, nutrition, texture, and uses. In addition, both fruits are native to North America and they have practically identical historical uses and known health benefits. Their composition, processing, nutritional value and metabolism, intended uses, and levels of undesirable substances are compared. 相似文献
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The objective of this study was to establish a cryopreservation protocol for hawthorn shoot apices (Crataegus pinnatifida Bge.). Cryopreservation was carried out via encapsulation–dehydration, vitrification, and encapsulation–vitrification on shoot apices excised from in vitro cultures. We began by showing that cold-acclimation enhanced the regrowth of cryopreserved apices from 10.0 to 65.5% in encapsulation–dehydration. We then decided that the encapsulation–dehydration method was an optimal cryopreservation method for hawthorn shoot apices in terms of its high recovery after cryopreservation as well as its ease of use compared with vitrification and encapsulation–vitrification. In encapsulation–dehydration, the protocol leading to optimal regrowth was as follows: after cold-acclimation at 5 °C in the dark for 2 weeks, excised shoot tips were pretreated for 24 h at 25 °C on hormone-free Murashige and Skoog [Murashige, T., Skoog, F., 1962. A revised medium for rapid growth and bioassays with tobacco tissue culture. Physiol. Plant. 15, 473–497] (MS) basal medium with 0.4 mol/L sucrose, then encapsulated and precultured in liquid MS medium with 0.8 mol/L sucrose for 16 h at 25 °C. Precultured beads were dehydrated for 6 h at 25 °C in the dessicator containing 50 g silica gel to a moisture content of 15.3% (fresh-weight basis) before cryostorage for 1 h. In addition, we examined the effect of adding glycerol to both the alginate beads and loading solution to enhance regrowth after cryopreservation in encapsulation–dehydration. In the present study, it was shown that adding 0.5 mol/L glycerol resulted in high regrowth percentages (82.5–90.0%) in four Crataegus species. 相似文献
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多效唑对猕猴桃离体试管苗生长及内源激素的影响 总被引：18，自引：0，他引：18
多效唑（ＰＰ３３３）处理猕猴桃试管苗，降低了其生长强度；植株体内的ＧＡ３、ＩＡＡ和ＺＴ含量下降，ＡＢＡ的含量上升，乙烯释放率增加；并且能降低外源的ＧＡ３和ＩＡＡ促进生长的作用，而外源的ＧＡ３和ＩＡＡ又能不同程度地逆转多效唑的抑制作用，使植株恢复生长。 相似文献
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HU Zhi-cheng ZHU Jia-yuan ZHU Bin GUO Dong CHEN Bin ZHANG Kai HU Kun-hua LI Ming-tao TANG Bing 《园艺学报》2011,27(9):1802-1806
AIM: To investigate and screen the sensitive proteins in the formation mechanism of pathological scars by comparing the results of differential proteomic analysis between pathological scars and normal skin.METHODS: Two-dimensional gel electrophoresis was used to detect the protein expression profiles in 8 keloid patients, 8 hypertrophic scar patients and 3 matched normal skin patients.The proteins that showed differential expression of over 4-fold change were cut and analyzed by MALDI-TOF/TOF mass spectrometry.RESULTS: A two-dimensional protein profiling comparison between pathological scars and normal skin was successfully established.On average, 2 978 spots in keloid, 2 975 spots in hypertrophic scar and 3 053 spots in normal skin were identified using gel analysis software.Compared with normal skin, there were totally 36 differentially-expressed proteins in keloid and hypertrophic scar identified from the spots of over 4-fold change, including 16 proteins in both keloid and hypertrophic scar (8 up-regulated and 8 down-regulated), 11 only in keloid (9 up-regulated and 2 down-regulated) and 9 only in hypertrophic scar (4 up-regulated and 5 down-regulated).CONCLUSION: Proteomic analysis can identify the proteins with variance of pathological scars versus normal skin, thus providing probable new clues to reveal the formation mechanism of pathological scars. 相似文献
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AIM:To investigate the effect of metallothionein(MT) on proliferation of rat vascular smooth muscle cells (VSMCs) stimulated by homocysteine and its mechanism. METHODS:VSMCs proliferation was measured by [3-H]-TdR incorporation, mitogen-activated protein kinase(MAPK)activity were determined by immunoprecipitation method, the intracellular contents of MT and malondialdehyde (MDA)were assayed by -hemoglobin saturation method and TBA reaction, respectively, and lactate dehydrogenase (LDH) leakage was measured by NADH oxidation. RESULTS:Hcy(10-6-10-4 mmol/L) stimulated [3-H]-TdR incorporation by the VSMCs in a concentration-dependent manner. Compared with control, [3-H]-TdR incorporation in VSMCs treated with 0.1 mmol/L Hcy was increased by 4.2 fold (P＜0.01). Meanwhile, Hcy enhanced MAPK activity, MDA formation and LDH release (P＜0.01)in a concentration-dependent manner. Treatment of VSMCs with MT alone did not change above parameters, compared with control. However, MT (10-6-10-4 mol/L)attenuated significantly Hcy-stimulated proliferation of VSMCs (P＜0.01)in a concentration-dependent manner. And MT inhibited obviously Hcy-induced activation of MAPK activity, MDA formation and LDH release. Preincubation of VSMCs with 0.5 mmol/L ZnCl2 for 6 h induced an increase cellular MT content by 5.7-fold (P＜0.01). The MT-overexpressed VSMCs resisted Hcy-stimulating action on MAPK activity, MDA formation and LDH leakage (P＜0.01). CONCLUSION:These results show that MT has an inhibitory effect on Hcy-induced VSMCs proliferation, and that MT could inhibit Hcy-stimulated MAPK activity and lipid peroxidation. 相似文献
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Duncan Brean W. Boyle Shannon Breininger David R. Schmalzer Paul A. 《Landscape Ecology》1999,14(3):291-309
Historic landcover dynamics in a scrubby flatwoods (Tel-4) and scrub landscape (Happy Creek) on John F. Kennedy Space Center were measured using aerial images from 1943, 1951, 1958, 1969, 1979, and 1989. Landcover categories were mapped, digitized, geometrically registered, and overlaid in ARC/INFO. Both study sites have been influenced by various land use histories, including periods of range management, fire suppression, and fire management. Several analyses were performed to help understand the effects of past land management on the amount and spatial distribution of landcover within the study sites. A chi-squared analysis showed a significant difference between the frequency of landcover occurrence and management period. Markov chain models were used to project observed changes over a 100-year period; these showed current management practices being effective at Tel-4 (restoring historic landscape structure) and much less effective at Happy Creek. Documenting impacts of past management regimes on landcover has provided important insight into current landscape composition and will provide the basis for improving land management on Kennedy Space Center and elsewhere. 相似文献
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AIM: Previous studies performed with XBP-01 in vitro indicated that XBP-01 could inhibit vascular smooth muscle cells from being transformed into foam cell and could eliminate the atherosclerotic plaque in C57BL/6J mouse. This experiment is to investigate its mechanism of eliminating plaques in vitro. METHODS: The cultured porcine artery smooth muscle cells incubated with XBP-01 of 0.1 mg/L for 24 h after preincubated with oxidized low density lipoprotein of 15 mg/L for 72 h in vitro. The samples were analyzed by fluorescence microscope, confocal microscope system and flow cytometry. RESULTS: Apoptosis was triggered by being incubated with oxidized low density lipoprotein and this process was accelerated additionally by being incubated with XBP-01. CONCLUSION: XBP-01 can be effective in eliminating atherosclerotic plaque by accelerating the process in which oxidized low density lipoprotein induced smooth muscle cell apoptosis. 相似文献
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XUE Ying-sheng WANG Jing-feng NIE Ru-qiong WU Wei-kang LUO Han-chuan CHEN Xiao-wei 《园艺学报》2004,20(4):603-607
AIM: To investigate the influence of Sini decoction (SND) on the proliferation and apoptosis of rabbit abdominal aorta smooth muscle cells after ballon injury and discuss the effect of vascular smooth muscle cell's (VSMCs) proliferation and apoptosis in post-percutaneous coronary intervention (PCI) restenosis (RS) and the feasibility of SND preventing post-PCI RS. METHODS: The animal model of rabbit abdominal aorta ballon injury was set up and the therapertic group was treated with SND. The shape of proliferative and apoptotic cell were investigated by electron microscope. Immunohistochemistry staining was performed using α-actin,PCNA and Cyclin E monoclonal antibodies. In situ Cell Death Detection Kit was used to identify apoptotic cells. Abdomial aorta angiography was operated in the 84th day subgroup and the stenosis degree was evalued by quantitative angiographic analysis. RESULTS: As compared with the control group, the therapeutic group displayed a lower proliferative percentage and a higher apoptosic percentage (P<0.05). Moreover, the apoptosic peek time was on the 14th day after operation,which was longer than the control group. CONCLUSION: SND effectly inhibited the proliferation of VSMCs and iuduced apoptosis in VSMCs. 相似文献