共查询到20条相似文献，搜索用时 125 毫秒
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连葱5号是以港葱二号的株系为母本,汉城极早的株系为父本配组杂交后,经多代选择育成的,具有抗病、高产、早熟等优点.平均每667 m2产量4 000～5 500kg,适于长江流域种植. 相似文献
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渥丹百合多倍体气孔性状的调查研究 总被引：1，自引：0，他引：1
用秋水仙素处理二倍体渥丹百合得到四倍体,对渥丹四倍体、二倍体及对照气孔进行观察.3个加倍的四倍体渥丹百合株系的气孔长度分别为51.25、56.50和54.26/μm,对照的气孔长度为37.42 μm,经秋水仙处理未加倍的二倍体株系气孔长度与对照接近,为38.75 μm.四倍体百合株系的气孔长度明显长于二倍体,从气孔密度看,加倍的四倍体渥丹各株系均明显低于二倍体,平均为10个/mm2,而二倍体渥丹及未加倍株系的气孔密度分别为17.1个/mm2和17.9个/mm2.气孔的大小和密度可以作为鉴别渥丹百合多倍体的显著区别性状.同时四倍体渥丹的保卫细胞也较二倍体有显著增大. 相似文献
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我国葡萄属野生种对炭疽病抗性的研究 总被引：2，自引：0，他引：2
利用田间自然鉴定.田间接种鉴定和室内果实离体鉴定三种方法.研究了起源于我国的葡萄属12种或变种、49个株系对葡萄炭疽病的抗性.结果表明.一些种和株系的果实不感炭疽病或感病率极低.表现为抗(?)性极强或强.严重感病的仅是个别株系.我国葡萄属植物是极为宝贵的抗炭疽病的种质资源. 相似文献
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转化CaMV基因芸薹属蔬菜植株抗病性鉴定及其遗传分析 总被引：3，自引：0，他引：3
以转化CaMV 弱株系Bari1 基因􀀂 的大白菜、菜薹、紫菜薹和花椰菜植株为试材, 研究了CaMV 弱株系Bari􀀁1 基因􀀂 所提供的遗传工程交叉保护及其遗传规律。结果表明,在转化CaMV 弱株系Bari􀀁1 基因􀀂 的大白菜、菜薹、紫菜薹和花椰菜植株中, 48. 08%对CaMV强株系CABB􀀁BJI 具有较强的抗性, 51. 92%表现为敏感。抗性基因( CaMV Bari􀀁1 基因) 在自交代( S1) 中大多数( 76%) 表现为典型的孟德尔单基因显性遗传, 部分株系的抗性出现了15 1, 1 1, 1 3 和1 95 的非孟德尔遗传现象。 相似文献
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葡萄属12个种45份种质资源抗寒性综合评价 总被引：4，自引：0，他引：4
以枝条自然失水速率和枝条冷冻处理后的电导率、萌芽率为评价指标,利用隶属函数法综合评价了葡萄属12个种45份种质资源的抗寒性.结果表明:在被测45份材料中,以山葡萄株系华县-47抗寒性最强,欧洲葡萄品种红地球抗寒性最差. 葡萄属植物的抗寒性差异不仅表现为种间差异,而且在种内不同株系间抗寒性差异也非常明显.在12个葡萄物种间,山葡萄抗寒性最强,其次是河岸葡萄,抗寒性最差的是欧洲葡萄.河岸葡萄、毛葡萄、复叶葡萄和瘤枝葡萄各种内不同株系间抗寒性差异不明显,山葡萄、秋葡萄、刺葡萄、NFEFB薁葡萄、麦黄葡萄、秦岭葡萄和欧洲葡萄种内不同株系间抗寒性差异明显. 相似文献
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樱桃矮化砧木''吉塞拉6号''基因转化体系的建立 总被引：1，自引：0，他引：1
采用'吉塞拉6号'甜樱桃矮化砧木(Prunus cerasus×P. canescens)离体叶片外植体,在再生培养基附加生长素的条件下通过根癌农杆菌(Agrobacterium tumefaciens)EHA105(p35SGUS intron)介导研究了β-葡萄糖醛酸酶基因(GUS)的瞬时表达、稳定表达和转基因植株再生,证明了培养基中生长素(IBA或NAA)的存在可促进基因转化,转化效率比对照提高2倍以上.将500个叶片外植体与EHA105(p35SGUS intron)株系在含有生长素的培养基中共培养,获得了11个转基因株系.采用PCR分析和Southern Blotting核酸杂交,确定GUS基因已整合到矮化砧木'吉塞拉6号'植株的染色体上.组织化学染色确定了GUS基因在植株体内的表达. 相似文献
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甜樱桃矮化砧木吉塞拉(Gisela)的离体叶片再生植株研究 总被引：18，自引：2，他引：16
用甜樱桃矮化砧木吉塞拉（Ｇｉｓｅｌａ）５号、７号（Ｐｒｕｎｕｓ ｃｅｒａｓｕｓ ｘ Ｐ．ｃａｎｅｓｃｅｎｓ）无菌生根苗的叶片作为外植体，进行不定芽再生植株的研究。以ＷＰＭ＋ＢＡ ５～７ ｍｇ／Ｌ＋ＩＢＡ ０．１～１．０ｍｇ／Ｌ做培养基，不定芽再生率高达７０％；吉塞拉５号的再生率明显高于７号；培养基中高浓度的细胞分裂素抑制吉塞拉７号的不定芽再生。不定芽的增殖、生根、温室锻炼、大田移栽均已获得成功，同时观察了植株在大田的生长状况。该成果可用于樱桃转基因育种和多倍体植株培育的研究。 相似文献
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为阐明芥菜开花路径核心调节子SVP与FLC相互作用的结构域,从酵母重组质粒pGADT7SVP、pGBKT7FLC分别亚克隆了5个SVP截短体（SVP1 ~ 5）和5个FLC截短体（FLC1 ~ 5）。SVP1 ~ 5与FLC1 ~5编码蛋白的结构域均分别为MI、MIK、K、IKC和KC。利用酵母双杂交体系,分别构建酵母猎物质粒pGADT7SVP1 ~ 5与诱饵质粒pGBKT7FLC1 ~ 5,并转化对应的酵母Y187、Y2HGold菌。酵母转化子Y187［pGADT7SVP2 ~ 5］能与Y2HGold［pGBKT7FLC］融合,并可在选择性固体培养基QDO/X/A上长出蓝色菌落,表明FLC能与截短体蛋白SVP2 ~ 5异源结合,SVP的K域（SVP3）可独立作用于FLC蛋白。此外,Y187［pGADT7SVP］× Y2HGold［pGBKT7FLC2 ~ 5］也能同时激活报告基因AUR1-C、HIS3、ADE2、MEL1,表明FLC的K域（FLC3）也可独立作用于SVP。进一步研究发现：Y187［pGADT7SVP3］× Y2HGold［pGBKT7FLC3］正向杂交以及Y187［pGADT7FLC3］× Y2HGold［pGBKT7SVP3］载体互换后杂交均可相互作用,表明SVP的K域（SVP第96 ~ 173位氨基酸区域）与FLC的K域（FLC第114 ~ 167位氨基酸区域）能够异源结合,是介导SVP与FLC蛋白互作的关键结构域。 相似文献
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AIM:To preliminarily explore the relationship between microRNA-7-5p (miR-7-5p) and Itch gene and their relationship with insulin resistance by establishing insulin resistance model of HepG2 cells in vitro for detecting differential expression of miR-7-5p and its predicted target gene Itch in the state of insulin resistance. METHODS:The insulin resistance model of HepG2 cells was induced by suitable concentration of plamitic acid. The possible target genes and the associated signaling pathways of miR-7-5p were predicted based on bioinformatic analysis. The expression levels of miR-7-5p and Itch were detected by RT-qPCR and Western blot in the HepG2 cells with insulin resistance. RESULTS:The HepG2 cell model of insulin resistance was successfully induced by treatment with 0.25 mmol/L palmitic acid for 24 h. Compared with negative control group, the expression level of miR-7-5p detected by RT-qPCR in insulin resistance group was significantly decreased (P<0.01). Bioinformatic analysis showed that a considerable number of target genes of miR-7-5p were enriched in the ubiquitin proteasome system. Among them, E3 ubiquitin ligase Itch gene was the most relevant target gene to insulin resistance. The results of Western blot showed that the protein expression of Itch was up-regulated in the HepG2 cells under insulin resistance (P<0.01). CONCLUSION:miR-7-5p may be involved in the pathophysiological process of insulin resistance, which may directly or indirectly affect the normal transduction of insulin signaling pathway by targeting Itch gene. 相似文献
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AIM: To detect the expression of WNT5B in normal breast epithelial cells and different breast cancer cell lines, and to investigate the effects of WNT5B over-expression on the viability and apoptosis of human breast cell line MCF-7.METHODS: The mRNA expression of WNT5B was detected by RT-PCR in different breast cancer cells. MCF-7 cells were transfected with plasmid pcDNA3.1/WNT5B or pcDNA3.1, and the expression of WNT5B at mRNA and protein levels was examined in the 2 groups by real-time PCR and Western blotting, respectively. Subsequently, the changes of cell viability and cell apoptosis were analyzed by CCK-8 assay and flow cytometry, respectively. RESULTS: The expression of WNT5B in the breast cancer cell lines was lower than that in MCF10A cells. The WNT5B expression in the MCF-7 cells in experimental group was significantly higher than that in vector group (P<0.05). However, the cell viability in experimental group decreased significantly as compared with vector group (P<0.05). The number of the cells in S-phase obviously increased, while the percentage of the cells in G1-phase and G2/M-phase decreased compared with vector group. The number of apoptotic cells in WNT5B group was significantly higher than that in vector group.CONCLUSION: The expression of WNT5B is decreased in breast cancer cells. WNT5B over-expression significantly inhibits the cell growth and promotes the cell apoptosis in breast cancer MCF7 cells. 相似文献
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AIM To investigate the effect of scutellarin （SCU） on oxidative stress and apoptosis induced by lipopolysaccharide （LPS） in human glomerular epithelial cells and its mechanism. METHODS Human glomerular epithelial cells were cultured in vitro , and were treated with LPS （1.0 mg/L） to establish a cell injury model. The cells were divided into normal control （NC） group, LPS group, NC+SCU group, LPS+SCU group, LPS+miR-NC group, LPS+microRNA-7-5p （miR-7-5p） group, LPS+SCU+anti-miR-NC group and LPS+SCU+anti-miR-7-5p group. Cell viability was detected by CCK-8 assay. Apoptosis was detected by flow cytometry. The intracellular malondialdehyde （MDA） content and superoxide dismutase （SOD） activity, and lactate dehydrogenase （LDH） activity in the cell culture supernatant were determined by kit. RT-qPCR was used to detect the expression level of miR-7-5p. RESULTS Compared with NC group, the cell viability, miR-7-5p expression and SOD activity in LPS group were significantly reduced, and the apoptotic rate, MDA content and LDH activity were significantly increased （P <0.05）. Compared with LPS group, the cell viability, miR-7-5p expression and SOD activity in LPS+SCU group were significantly increased, and the apoptotic rate, MDA content and LDH activity were significantly reduced （P <0.05）. Compared with LPS+miR-NC group, the cell viability and SOD activity in LPS+miR-7-5p group were significantly increased, and the apoptotic rate, MDA content and LDH activity were significantly reduced （P <0.05）. Compared with LPS+SCU+anti-miR-NC group, the cell viability and SOD activity in LPS+SCU+anti-miR-7-5p group were significantly reduced, and the apoptotic rate, MDA content and LDH activity were significantly increased （P <0.05）. CONCLUSION Scutellarin inhibits LPS-induced oxidative stress damage and apoptosis in glomerular epithelial cells via up-regulating miR-7-5p expression. 相似文献
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AIM:To investigate the relationship of microRNA-7 (miRNA-7) over-expression and epidermal growth factor receptor (EGFR)/phosphatidylinositol kinase-3 (PI3K)/protein kinase B (PKB, also called Akt) pathway in human nasopharyngeal carcinoma 5-8F cells. METHODS:The 5-8F cells were transfected with miRNA-7 mimics (carrying by Lipofectamine 2000). The expression of miRNA-7 was detected by real-time PCR. The cell proliferation was analyzed by CCK-8 assay. The cell colony-forming capability was determined by cell colony formation test. The expression of EGFR/PI3K/Akt at mRNA and protein levels was examined by real-time PCR and Western blotting. RESULTS:The expression level of miRNA-7 was significantly increased in 5-8F cells compared with negative control (NC) group and control group (P<0.01). The proliferation of NPC 5-8F cells was decreased extremely after tansfected with the miRNA-7 mimics (P<0.01), so did the result of the cell colony-formation test. The expression of EGFR/PI3K/Akt at mRNA and protein levels was significantly down-regulated compared with NC group and control group (P<0.01). CONCLUSION: Over-expression of miRNA-7 significantly inhibits the proliferation and colony-forming ability of nasopharyngeal carcinoma 5-8F cells by down-regulation of EGFR/PI3K/Akt pathway. 相似文献