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排序方式: 共有125条查询结果,搜索用时 15 毫秒
81.
为快速、准确鉴定木槿蚜虫,本文在广州市30个采样点采集了木槿蚜虫样本64份,利用DNA条形码技术获得了64份线粒体细胞色素C氧化酶亚基I(COI)基因的658 bp序列,同时利用形态鉴定和DAN条形码鉴定确定其中共包括5种蚜虫,棉蚜Aphis gossypii Glover、绣线菊蚜Aphis spiraecola Patch、苹果蚜Aphis pomi de Geer、月季长管蚜Sitobion rosivorum(Zhang)和桃蚜Myzus persicae(Sulzer)。所有样品的种内平均遗传距离为0.30%(0~2.30±0.36%),种间平均遗传距离为9.00%(3.30%~10.90±1.22%)。邻接法(neighbor-joining,NJ)构建的系统发育树显示采自30个采样点木槿上的5种蚜虫分别聚为一支,支持率达99%。所获DNA条形码对指导木槿的蚜虫防治有一定的指导意义。 相似文献
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《Archives Of Phytopathology And Plant Protection》2012,45(9-10):917-929
AbstractIn this research, to identify natural wild hosts of TYLCV, 44 symptomatic samples were collected in or around harvested tomato fields in south-eastern Iran and tested for the TYLCV infection by PCR. Among four PCR-positive plant species, full-length genome of TYLCV was amplified by rolling circle amplification (RCA) method only from a ground cherry (Physalis divaricata L., Solanaceae) sample. Cloning and full-length genome sequencing of a ground cherry isolate (G4) showed that it comprises 2756 nucleotides (nts) in length and shares 87.7%–95.2% nt sequence identities with TYLCV isolates reported from Iran, Oman and Pakistan. The G4 isolate of TYLCV was successfully transmitted to tomato plants and the original host (P. divaricata) via agroinoculation and showed typical symptoms. According to the results of this research, four symptomatic weed species appear to be alternative hosts of TYLCV and play the role of the primary inoculum for the viral infection. 相似文献
84.
两种消浪树种幼苗光合特性对模拟潮汐水淹的响应 总被引:1,自引:0,他引:1
吴统贵;袁涛;王宗星;吴明;虞木奎;孙海菁 《植物研究》2012,32(5):615-620
滨海滩涂消浪林是沿海防护林体系的重要组成部分,在消浪护岸、促淤保滩、防御来自海洋自然灾害等方面具有不可代替的作用。本研究以中亚热带两种木本消浪植物海滨木槿(Hibiscus hamabo)和蜡杨梅(Myrica cerifera)为研究对象,模拟海水水淹,系统研究了不同海水水淹程度下两木本植物光合特性的响应规律。结果发现,随着水淹胁迫的增加,海滨木槿最大净光合速率逐渐下降、光补偿点逐渐增加,表观量子效率在7、21天时先降低后增加,后期呈现逐渐降低的趋势,说明胁迫初期通过增加光合利用率来适应水淹胁迫,暗呼吸速率在7、21天逐渐增加,而在42、70天时W8(水淹8 h,水深45 cm)处理显著小于其它处理,说明W8处理已显著影响了该树种的光合特征;蜡杨梅最大净光合速率、表观量子效率表现为逐渐降低的趋势,而光补偿点和暗呼吸速率则逐渐增加,42天后W6(水淹6 h,水深35 cm)、W8处理各项指标显著小于其它处理。经多元方差分析发现,水淹21天内海滨木槿的光合指标要显著好于蜡杨梅,而在42天后则基本相同;海滨木槿在水淹胁迫6 h内可以生长,而蜡杨梅则只能在4 h内,这可为消浪林构建提供理论依据。 相似文献
85.
山东四种草本植物的核型研究 总被引:5,自引:2,他引:3
本文对山东4种草本植物进行了染色体研究。结果表明:阿尔泰狗哇花(Heteropappusal taicus(Wild)Navopokr)的染色体数目为2n=36,核型公式为K(2n)=36=36m,核型“1A”型;求米草(Oplismenusundulatifolius(Arduino)RoemetSchult)的染色体数目为2n=12,核型公式为K(2n)=12=8m+4sm,核型“2A”型;红秋葵(Hibiscuscocineus(Medic)Walt)的染色体数目为2n=38,核型公式为K(2n)=38=14m+22sm+2st,核型“2B”型;蟋蟀草(Eleusineindica(L)Gaertn)的染色体数目为2n=18,核型公式为k(2n)=18=16m+2sm,核型“2A”型。 相似文献
86.
The efficacy of fallow and coastal bermudagrass (Cynodon dactylon) as a rotation crop for control of root-knot nematode (Meloidogyne incognita race 1) and soilborne fungi in okra (Hibiscus esculentus cv. Emerald), squash (Cucurbita pepo cv. Dixie Hybrid), and sweet corn (Zea mays cv. Merit) was evaluated in a 3-year field trial. Numbers of M. incognita in the soil and root-gall indices were greater on okra and squash than sweet corn and declined over the years on vegetable crops following fallow and coastal bermudagrass sod. Fusarium oxysporum and Pythium spp. were isolated most frequently from soil and dying okra plants. Numbers of colony-forming units of soilborne fungi generally declined as the number of years in sod increased, but were not affected by coastal bermudagrass sod. Yields of okra following 2-year and 3-year sod and squash following 2-year sod were greater than those following fallow. Yield of sweet corn was not different following fallow and coastal bermudagrass sod. 相似文献
87.
Polymorphic microsatellite markers were developed for Hibiscus glaber, an endemic tree of the Bonin Islands. Eighty-seven of the 208 sequences from an enriched library were unique and containing microsatellites. Ten loci were proved to be highly polymorphic among 78 individuals from the Nishi-jima Island. Total exclusionary powers for the first and the second parents were 99.989% and 99.999%, respectively. Nine loci also amplified single fragment from genomic DNA of H. tiliaceus, a related and widespread congener. Our markers can be reliably used for the estimation of current gene flow within/among populations of the two woody Hibiscus species. 相似文献
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Ekaterina A. Lazareva Alexander A. Lezzhov Tatiana V. Komarova Sergey Y. Morozov Manfred Heinlein Andrey G. Solovyev 《Molecular Plant Pathology》2017,18(5):611-624
Hibiscus green spot virus (HGSV) is a recently discovered and so far poorly characterized bacilliform plant virus with a positive‐stranded RNA genome consisting of three RNA species. Here, we demonstrate that the proteins encoded by the ORF2 and ORF3 in HGSV RNA2 are necessary and sufficient to mediate cell‐to‐cell movement of transport‐deficient Potato virus X in Nicotiana benthamiana. These two genes represent a specialized transport module called a ‘binary movement block’ (BMB), and ORF2 and ORF3 are termed BMB1 and BMB2 genes. In agroinfiltrated epidermal cells of N. benthamiana, green fluorescent protein (GFP)‐BMB1 fusion protein was distributed diffusely in the cytoplasm and the nucleus. However, in the presence of BMB2, GFP‐BMB1 was directed to cell wall‐adjacent elongated bodies at the cell periphery, to cell wall‐embedded punctate structures co‐localizing with callose deposits at plasmodesmata, and to cells adjacent to the initially transformed cell. Thus, BMB2 can mediate the transport of BMB1 to and through plasmodesmata. In general, our observations support the idea that cell‐to‐cell trafficking of movement proteins involves an initial delivery to membrane compartments adjacent to plasmodesmata, subsequent entry of the plasmodesmata cavity and, finally, transport to adjacent cells. This process, as an alternative to tubule‐based transport, has most likely evolved independently in triple gene block (TGB), double gene block (DGB), BMB and the single gene‐coded transport system. 相似文献
90.
利用响应面法优化玫瑰茄粗多糖的提取工艺条件,测定粗多糖的抗氧化活性。按照Box-Behnken中心组合试验设计原理,以玫瑰茄粗多糖的得率为响应值,在单因素试验的基础上,进行响应面分析试验,考察料液比、提取时间和提取温度对得率的影响。玫瑰茄粗多糖最佳提取工艺条件为:料液比1∶26 (g/mL)、提取时间3.1 h、提取温度90℃,在该最优条件下所得玫瑰茄粗多糖的得率为14.41%,与预测值接近;玫瑰茄粗多糖对DPPH、羟基、超氧阴离子自由基具有一定的清除作用。研究结果为玫瑰茄粗多糖的研究、开发和利用提供了理论基础。 相似文献