Two novel biphenyl dimers from the heartwood of Caesalpinia sappan     

Shu SH  Deng AJ  Li ZH  Qin HL 《Fitoterapia》2011,82(5):762-766

Two novel biphenyl dimers, caesappanin A (1) and B (2), were isolated from the ethanol extract of the heartwood of Caesalpinia sappan. Their structures were elucidated on the basis of spectroscopic data including IR, HRESIMS, 1D and 2D NMR. Preliminary bioassays showed that compound 1 possessed potent cytotoxic effects against 4 cell lines including HCT-8, BGC-823, A549 and A2780 with IC₅₀ between 1.67 μM and 4.88 μM.  相似文献   

Identity of naturalised exotic Wisteria (Fabaceae) in the south-eastern United States     

J L TRUSTY  B G LOCKABY  W C ZIPPERER†  & L R GOERTZEN‡ 《Weed Research》2007,47(6):479-487

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豆科Leguminosae植物部分属种花粉形态研究     

姚雅琴  蒋选丽  郁枫 《西北农林科技大学学报(自然科学版)》1990,(2):78-83

采用新鲜花粉直接粘台法,用扫描电镜对31属52种花粉形态进行了观察。结果表明:所观察的花粉形态可分为五大类型:16合花粉型、球形角孔型、球形三沟型、长球三孔沟型和长球三沟型。外壁纹饰有穴状、网状、波纹状、瘤状和光滑之分。同一亚科各属之间,花粉形态存在着明显的差异,本文还从花粉形态方面提出把扁蓿豆属(Melissitusmedic)从胡卢巴属(Trigonella L.)或苜蓿属(Medicago L)中分出、列为一新属是合理的。  相似文献   

Floral Analysis and Seasonal Dynamics of Mineral Levels in Carob Tree Leaves     

L. Custódio  P. J. Correia  M. A. Martins-Loução  A. Romano 《Journal of plant nutrition》2013,36(5):739-753

The mineral concentration of flowers and the seasonal fluctuation of macro- [nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg)] and micronutrients [iron (Fe), manganese (Mn), zinc (Zn), and copper (Cu)] in leaves of male, female, and hermaphroditic carob trees (Ceratonia siliqua L.) were studied. The nutrient dynamics were linked not only to phenological events, but also to the gender of the trees. The females were able to allocate more nutrients to leaves than male trees, even though male flowers were richer in particular elements such as N and Zn. The hermaphrodites supported the development of both inflorescences and fruits with a lower seasonal variation and a lower leaf nutrient concentration, as compared to the other genders, which may indicate a more efficient use of resources. Flowers had, in general, a higher concentration of N, P, and K, and a lower Mn concentration than in leaves. Flowers of the females had a lower nutrient concentration compared to males or hermaphrodites.  相似文献   

Fuscacarpans A–C,new pterocarpans from the stems of Erythrina fusca     

Phongsak Innok  Thitima Rukachaisirikul  Souwalak Phongpaichit  Apichart Suksamrarn 《Fitoterapia》2010

Chemical investigation of the stems of Erythrina fusca Lour. led to the isolation of three new pterocarpans, named fuscacarpans A–C (1−3), together with fourteen known compounds, sandwicensin (4), erythribyssin A (5), erythrabissin I (6), demethylmedicarpin (7), eryvarin D (8), erypoegin I (9), hydroxycristacarpone (10), orientanol A (11), scandenone (12), genistein (13), liquiritigenin (14), isoliquiritigenin (15), vestitone (16) and 3,7,4′-trihydroxyflavone (17). Structures 1−3 were elucidated by spectroscopic and chemical methods. The isolates were evaluated for antibacterial, antiplasmodial and cytotoxic activities.  相似文献   

细柄蕈树苗期光合生理特性研究          下载免费PDF全文

伍定芳 《农学学报》2015,5(4):85-89

利用LCPRO+便携式光合作用测定系统对细柄蕈树光合作用日变化及光响应进行测定和分析,结果表明：细柄蕈树的净光合速率(Pn)、蒸腾速率(Tr)气孔导度(Gs)的日变化曲线均为单峰曲线,无“光合午休”现象;水分利用率(WUE)和气孔限制值(Ls)日变化曲线最大值都在9：00时,17：00时后急剧下降;胞间CO2浓度(Ci)日变化曲线趋势与Ls恰好相反。 Pn与光合有效辐射(PAR)、Tr成极显著正相关,与Ci呈极显著负相关,与其它因子相关不显著, Pn与内部自身因素关系更大。细柄蕈树有较高的光饱和点(LSP)、光补偿点(LCP)和表观量子效率(AQY),为典型的阳性树种,对强光利用能力强,对弱光利用效率高, 环境的适应性强。  相似文献   

15种豆科树种的家居用材表面视觉特性差异     

李权  肖启航  许华寅  林金国 《福建林学院学报》2017,37(3)

为了科学合理利用豆科家居用材,对15种豆科树种的家居用材分别用醇酸清漆进行涂饰,并对涂饰后的木材表面进行颜色测量和分析,探讨了这些木材视觉物理量的分布特征。结果表明:15种豆科植物的家居用材的明度指数(L*)为15.48~31.39,孟塞尔明度(V)为0.39~1.98。非洲崖豆木L*和V均最小,鞋木L*和V均最大;色品指数中红绿轴色品指数(a*)为3.87~25.90,黄蓝轴色品指数(b*)为31.24~65.32。两蕊苏木a*和b*均最大,紫心苏木a*最小,非洲崖豆木b*最小;色调值参数中色相(H)为1.63Y~3.88Y,均分布在Y色调系内,非洲崖豆木H最大,印茄木H最小;色饱和度(C)为6.73~23.38,非洲崖豆木的C最小,两蕊苏木C最大。  相似文献   

豆科植物抗菌成分的研究进展     

毕允晨  张秀娟  樊守金 《安徽农业科学》2009,37(9):3877-3879

简要归纳了豆科抗菌植物的种类,对从中提取的生物碱、黄酮和萜类等抗菌活性成分进行了介绍,并对豆科植物抗菌成分在新农药和新医药的研究与开发中的应用前景进行了展望。  相似文献   

云南干热河谷4种植物抗旱机理的研究   总被引：4，自引：0，他引：4  

赵琳  郎南军  温绍龙  郑科 《西部林业科学》2006,35(2):9-16

通过干旱胁迫试验,对云南干热河谷4种植物的抗旱机理进行了研究。选用与植物抗旱性关系密切的8个生理生化测定指标:叶片相对含水量、相对电导率、MDA、SOD、POD、荧光、叶绿素含量、Pro,运用模糊数学中的隶属函数方法对云南干热河谷的车桑子、清香木两个原生植物和山毛豆、银合欢两个引种植物容器苗的抗旱性能进行了系统地综合评价。从而克服了单项生理生化指标的片面性,使评定结果较客观全面地反映此4种干热河谷植物的抗旱机理。  相似文献   

中国26种豆科木材导管附物纹孔的电镜观察和研究   总被引：1，自引：1，他引：1  

姜笑梅  周Yin 《林业科学》1992,28(2):138-145,T003

本文对我国豆科植物的3亚科、19属、26种木材导管的附物纹孔进行了扫描电镜观察,除3属4种木材的导管无附物纹孔外,其余均有。附物纹孔的有无及其形态、分布特征是区分豆科各属、种的一个重要标志。此外,14种木材切片用5％次氯酸钠溶液处理后,大部分附物减小,以至消失。又对其中一种木材的超薄切片进行透射电镜研究表明,附物和次生壁的电子密度不同,说明两者的化学成分不同。还对附物的形成、生理功能、与瘤状物的关系进行了讨论。  相似文献