共查询到17条相似文献，搜索用时 218 毫秒
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杜仲Eucommia ulmoides的核型分析 总被引：1，自引：0，他引：1
以萌发种子的根尖为材料,对兰州地区引种的杜仲进行了体细胞染色体核型分析。结果显示：杜仲染色体较小,数目均为34条,与前人的研究结果一致;杜仲体细胞染色体核型有2类,第1类为2n=34=20m（2SAT）＋10sm＋4st,第2类为2n=34=20m（2SAT）＋12sm＋2st,在2类核型中均见到了随体染色体,随体均位于中部着丝点染色体的短臂上。2类核型中最长染色体与最短染色体的比值分别小于2,臂比值大于2：1的染色体的比例在1％～50％之间,按照stebbins的核型分类标准应属2A核型,与前人的核型分析结果差异较大。 相似文献
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荚(艹迷)属(Viburnum)全世界约有250种,分布于亚洲、欧洲、南美洲和北美洲。我国约有74种,南北均有分布。荚(艹迷)组(Sect.odontotinus)的荚(艹迷)(V.dilatatum Thunb.)广布于陕、豫、冀三省的南部及长江以南诸省(区),但以华东地区为常见;直角荚(艹迷)(V.foetidum Wallvar.rectangulatum(Graebn.)Rehd.)分布于滇、川、甘、陕、黔、桂、湘、鄂、赣、台等省(区);宜昌荚(艹迷)(V.ichangense(Hance)Rehd.)分布在鲁、豫、苏、浙、闽、赣、 相似文献
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Macleaya cordata (plume poppy) is used in traditional Chinese medicine for its anti-inflammatory and antibacterial activities. In this study, we examined whether M. cordata extract and/or its major alkaloid constituents, protopine, allocryptopine, sanguinarine and chelerythrine activate the Nrf2 signalling pathway which regulates the expression of cytoprotective enzymes including heme oxygenase-1 (HO-1) and thioredoxin 1. In murine macrophage RAW264.7 cells, M. cordata extract increased both mRNA and protein levels of HO-1. Of the alkaloids examined, only sanguinarine appeared to be responsible for these effects. At the concentration of 2 μM, sanguinarine induced nuclear accumulation of Nrf2, increased the expression of Hmox1 gene encoding HO-1 and elevated HO-1 protein levels. Sanguinarine-induced Hmox1 mRNA expression was suppressed by SB203580, a pharmacologic inhibitor of p38 mitogen-activated protein kinases (p38 MAPKs). The upregulation of HO-1 in RAW264.7 cells by sanguinarine was, however, accompanied by decrease in cell viability. Nonetheless, sanguinarine at micromolar, non-cytotoxic concentrations elevated protein levels of HO-1 and thioredoxin 1 in primary cultures of human hepatocytes. We conclude that sanguinarine may, under appropriate conditions, increase the capacity of the enzymatic antioxidant defence system via activation of the p38 MAPK/Nrf2 pathway. 相似文献
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本文研究比较了田紫胶虫红、黄两种色型雌虫的核型.两种色型的染色体数目恒定,均为2n=2x=18.染色体类型基本一致:1～4为中部着丝点染色体(m),5～9为端部着丝点染色体(T),其中,黄色型第1、2、4对染色体呈棒状,第3对染色体为肾形,第5～9对染色体为椭圆形或长圆形;红色型第1对的2条染色体长度差异较大,第2、3、4对染色体呈棒状,第5～9对染色体为椭圆形或长圆形.红、黄两种色型在长臂、短臂、臂比等方面存在一定差异,经t-检验,结果表明:2种色型差异不显著.核型公式为:Ky(2n,♀)=18=8m 10T=4L 4M2 4M1 6S. 相似文献
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Chlorophyll concentration is related positively to the point of maximum slope in the reflectance spectra of leaves and this point is termed the red edge. The reflectance spectra of slash pine (Pinus elliottii Engelm.) needles were measured in the field and the chlorophyll concentrations of the same needles were measured in the laboratory. The measurement errors for red edge and chlorophyll concentration were determined to be 2.2 nm (3% of mean) and 0.35 mg g(-1) (19% of mean), respectively. The red edge-chlorophyll concentration relationship was strong (r(2) = 0.82, n = 152). A red edge-chlorophyll concentration relationship for n = 100 was used with red edge measurements to estimate chlorophyll concentration with an rms error of 0.31 mg g(-1) (17% of mean, n = 52). The entire red edge-chlorophyll concentration relationship for n = 152 was also used with red edge measurements to estimate the chlorophyll concentration of samples from an earlier experiment with an rms error of 0.47 mg g(-1) (30% of mean, n = 38). We conclude that measures of red edge can be used to estimate the chlorophyll concentration of detached needles in the field with an accuracy similar to that obtained by conventional laboratory measurements. 相似文献
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湖北"金丝油桐"和贵桐2号的核型分析 总被引：1，自引：0，他引：1
"金丝桐油"是由湖北恩施地方品种"金丝油桐"果实加工而成的品质特优的传统出口产品,分析"金丝油桐"的核型有利于该地方品种的鉴定、保护与开发利用。以全国推广品种"贵桐2号"和湖北恩施地方品种"金丝油桐"为试验材料,对其核型进行了分析,结果表明:"金丝油桐"与"贵桐2号"的核型存在较大的差异,其中3、6、8、9、11号染色体的差异明显;"金丝油桐"的核型公式为2 n=22=14 m 6 sm 2 M,其中1、2、4、5、6、7、10号染色体为m型,11号染色体为M型,3、8、9号染色体为sm型,核型对称性为1B型;"贵桐2号"的核型公式为2 n=22=16 m 4 sm 2 M,其中1、2、3、4、5、7、10、11号染色体为m型,8号染色体为M型,6、9号染色体为sm型,核型对称性为1B型。核型分析结果显示,"金丝油桐"是一个不同于"贵桐2号"的地方品种。 相似文献