The mangrove plant Heritiera littoralis D. (Sterculi-aceae) is widelydistributed in southeastern Asia and traditionally used as a fish, arrowhead, and spearhead poison .It has also been used as a folk medicine to trea...The mangrove plant Heritiera littoralis D. (Sterculi-aceae) is widelydistributed in southeastern Asia and traditionally used as a fish, arrowhead, and spearhead poison .It has also been used as a folk medicine to treat he-maturia and diarrhea for a long history inChina . Past investigations on the chemical constituents of this plant have yielded fourtriterpenes, five sesquiterpenes, a phe-nylproanoid-glycerol and four flavonoids. In the presentstudy, eight flavonoids were isolated from the 95% EtOH extract of the leaves of this plant, andidentified as quercitrin (1), quercetin (2),kaempferol-3-O-(6″-O-E-p-coumaroyl)-β-D-glucopyranoside ( 3 ), kaempferol (4), kaempferitrin (5),myricetin (6), eriodictyol (7), and catechin (8) on the basis of their spectral data.展开更多
[Objectives]To establish a quality standard method for the determination of quercetin in leaves of Heritiera littoralis.[Methods]Quercetin was extracted from the leaves of H.littoralis by alcohol extraction,and the qu...[Objectives]To establish a quality standard method for the determination of quercetin in leaves of Heritiera littoralis.[Methods]Quercetin was extracted from the leaves of H.littoralis by alcohol extraction,and the quercetin was quantitatively analyzed by HPLC.[Results]There was a good linear relationship between the peak area(A)and the content(M)of quercetin in the range of 0.048-0.168μg,A=2615.5M+1.5286,r=0.9999.The method was applied to the determination of ethanol extract of H.littoralis leaves,the average recovery rate was 98.77%and RSD was 1.57%.[Conclusions]The method is simple,convenient,reproducible and accurate,and provides an idea for the determination of quercetin in leaves of H.littoralis.展开更多
Inundation associated with flooding and sea level rise is predicted to have major impacts on survival, growth and productivity of mangroves. A manipulative mesocosm experiment was conducted to assess whether nutrient ...Inundation associated with flooding and sea level rise is predicted to have major impacts on survival, growth and productivity of mangroves. A manipulative mesocosm experiment was conducted to assess whether nutrient enrichment enhances growth and photosynthesis of waterlogged and salinity stressed seedlings of the mangrove Heritiera littoralis Dryand. Seedlings were fertilized with a three-component granular farm NPK (Nitrogen-Phosphorous-Potassium, 20:20:20) at varied loads under waterlogging with four levels of salinity. Growth was assessed through biomass accumulation, and photosynthesis through photosynthetic quantum yield and leaf Chl content. When seedlings were exposed to both nutrient enrichment and increased salinity, a significant shift of biomass to roots was observed. Seedlings had low value of Chl a/b ratio and photosynthetic distraction resulting in mortality was high in the highest salinity and nutrient levels. These results are useful in explaining failure of regeneration in natural stands of riverine and freshwater bound mangroves following unprecedented flooding events that accrue land based nutrient loads into estuaries and deltas.展开更多
对红树植物银叶树(H er itiera littora lis)的果实和种子进行果形因子:果重(Y)、果长(X1)、果宽(X2)、果厚(X3);果实体积;果实浮力;果实、果壳和种子重量;果壳和种子含水量的测定分析,结果表明:银叶树的果实含水量相对稳定;种子与果壳...对红树植物银叶树(H er itiera littora lis)的果实和种子进行果形因子:果重(Y)、果长(X1)、果宽(X2)、果厚(X3);果实体积;果实浮力;果实、果壳和种子重量;果壳和种子含水量的测定分析,结果表明:银叶树的果实含水量相对稳定;种子与果壳的重量比例(1.8¨1)较大;果实的浮力与果实体积存在显著正相关性(P<0.05,r=0.2995),1/3的果实具有较强的漂浮能力;银叶树果实的各项形态结构指标相对稳定;果重与果厚达到极显著相关(P<0.01,r=0.3557),与果宽达到显著相关(P<0.05,r=0.3186),与果长无显著相关关系(P>0.05,r=-0.0016),果重与果形因子的线性回归模型为:Y=0.388X2+0.4X3-14.165。展开更多
文摘The mangrove plant Heritiera littoralis D. (Sterculi-aceae) is widelydistributed in southeastern Asia and traditionally used as a fish, arrowhead, and spearhead poison .It has also been used as a folk medicine to treat he-maturia and diarrhea for a long history inChina . Past investigations on the chemical constituents of this plant have yielded fourtriterpenes, five sesquiterpenes, a phe-nylproanoid-glycerol and four flavonoids. In the presentstudy, eight flavonoids were isolated from the 95% EtOH extract of the leaves of this plant, andidentified as quercitrin (1), quercetin (2),kaempferol-3-O-(6″-O-E-p-coumaroyl)-β-D-glucopyranoside ( 3 ), kaempferol (4), kaempferitrin (5),myricetin (6), eriodictyol (7), and catechin (8) on the basis of their spectral data.
基金Guangxi Key Laboratory of Zhuang and Yao Ethnic Medicine(GXZYKF2019-7).
文摘[Objectives]To establish a quality standard method for the determination of quercetin in leaves of Heritiera littoralis.[Methods]Quercetin was extracted from the leaves of H.littoralis by alcohol extraction,and the quercetin was quantitatively analyzed by HPLC.[Results]There was a good linear relationship between the peak area(A)and the content(M)of quercetin in the range of 0.048-0.168μg,A=2615.5M+1.5286,r=0.9999.The method was applied to the determination of ethanol extract of H.littoralis leaves,the average recovery rate was 98.77%and RSD was 1.57%.[Conclusions]The method is simple,convenient,reproducible and accurate,and provides an idea for the determination of quercetin in leaves of H.littoralis.
文摘Inundation associated with flooding and sea level rise is predicted to have major impacts on survival, growth and productivity of mangroves. A manipulative mesocosm experiment was conducted to assess whether nutrient enrichment enhances growth and photosynthesis of waterlogged and salinity stressed seedlings of the mangrove Heritiera littoralis Dryand. Seedlings were fertilized with a three-component granular farm NPK (Nitrogen-Phosphorous-Potassium, 20:20:20) at varied loads under waterlogging with four levels of salinity. Growth was assessed through biomass accumulation, and photosynthesis through photosynthetic quantum yield and leaf Chl content. When seedlings were exposed to both nutrient enrichment and increased salinity, a significant shift of biomass to roots was observed. Seedlings had low value of Chl a/b ratio and photosynthetic distraction resulting in mortality was high in the highest salinity and nutrient levels. These results are useful in explaining failure of regeneration in natural stands of riverine and freshwater bound mangroves following unprecedented flooding events that accrue land based nutrient loads into estuaries and deltas.
文摘对红树植物银叶树(H er itiera littora lis)的果实和种子进行果形因子:果重(Y)、果长(X1)、果宽(X2)、果厚(X3);果实体积;果实浮力;果实、果壳和种子重量;果壳和种子含水量的测定分析,结果表明:银叶树的果实含水量相对稳定;种子与果壳的重量比例(1.8¨1)较大;果实的浮力与果实体积存在显著正相关性(P<0.05,r=0.2995),1/3的果实具有较强的漂浮能力;银叶树果实的各项形态结构指标相对稳定;果重与果厚达到极显著相关(P<0.01,r=0.3557),与果宽达到显著相关(P<0.05,r=0.3186),与果长无显著相关关系(P>0.05,r=-0.0016),果重与果形因子的线性回归模型为:Y=0.388X2+0.4X3-14.165。
