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《Communications in Soil Science and Plant Analysis》2012,43(15):1960-1979
The mineral compositions of the fruit and tree parts of common guava, Psidium guajava L., and strawberry guava, Psidium cattleianum var. lucidum, were determined. The study occurred during three seasons at six locations in Hawaii to assess guava as feed for livestock. Guava bark contained the greatest concentrations of calcium (Ca) and ash; leaves the greatest concentrations of magnesium (Mg), sulfur (S), sodium (Na), boron (B), and manganese (Mn); and the shoots had the greatest concentrations of nitrogen (N), phosphorus (P), and potassium (K). The leaves and the shoots had the greatest concentrations of copper (Cu) and iron (Fe). Between guava and waiwi, guava had greater concentrations of most minerals except for Na in all plant parts, and Mg and ash in the leaves. Guava leaves and shoots meet the macromineral requirements for various phases of sheep, goat, and beef cattle life cycles with the exception of P and Na. Guava shoots do not meet Mn requirements for lactating cows. 相似文献
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番石榴发育期生物活性物质研究 总被引:1,自引:0,他引:1
番石榴风味独特,营养丰富。本研究以‘珍珠’番石榴和‘水晶’番石榴为试材,研究番石榴果皮和果肉中 生物活性物质含量及其与抗氧化能力关系。结果表明:番石榴果皮和果肉中,‘珍珠’番石榴的总酚、类黄酮、酚酸、 单宁含量均高于‘水晶’番石榴;番石榴的果皮和果肉发育过程中总酚、类黄酮、酚酸、叶绿素及类胡萝卜素含量均 呈下降趋势;番石榴果皮中生物活性物质含量高于果肉,且果皮抗氧化能力高于果肉;在生物活性物质与总抗氧化能 力的相关性方面,总酚含量相关性最高。本研究结果可为番石榴加工产品开发提供理论和实践基础。 相似文献
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番石榴SRAP反应体系的建立与正交优化 总被引:1,自引:1,他引:0
采用正交设计方法,对影响番石榴SRAP反应体系的Mg2+、dNTPs、引物、Taq DNA聚合酶和模板DNA浓度等进行了优化,建立了适用于番石榴的SRAP反应体系。该优化的20 μL反应体系中包含2.5 mmol/L Mg2+,0.15 mmol/L dNTPs,0.4 μmol/L引物,1.5 U Taq DNA聚合酶和20 ng模板DNA。利用该优化体系通过64对SRAP引物组合对5份番石榴材料进行了SRAP-PCR扩增,结果表明SRAP引物及优化后的反应体系能够有效地用于番石榴种质资源鉴定及遗传多样性分析等研究。 相似文献
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M. Tigano K. De Siqueira P. Castagnone‐Sereno K. Mulet P. Queiroz M. Dos Santos C. Teixeira M. Almeida J. Silva R. Carneiro 《Plant pathology》2010,59(6):1054-1061
The objectives of this work were to evaluate the genetic variability of Meloidogyne enterolobii by molecular markers, and develop species‐specific molecular markers for application in detection. Sixteen M. enterolobii isolates from different geographical regions (Brazil and other countries) and hosts were used in this study. The identification and purification of the populations were carried out based on isoenzyme phenotype. The DNA amplification of the intergenic region (IGS) of the rDNA and of the region between the cytochrome oxidase subunit II (COII) and 16S rRNA genes (mtDNA) produced specific fragments of the expected size for this nematode, i.e. 780 and 705 bp, respectively. Intraspecific variability among the isolates was evaluated with three different neutral molecular markers: AFLP, ISSR and RAPD. The results showed a low level of diversity among the isolates tested, indicating that M. enterolobii is a genetically homogeneous root‐knot nematode species. The RAPD method allowed the identification of a species‐specific RAPD fragment for M. enterolobii. This fragment was cloned and sequenced, and from the sequence obtained, a set of primers was designed and tested. The amplification of a 520‐bp‐long fragment occurred only for the 16 isolates of M. enterolobii and not for the 10 other Meloidogyne species tested. In addition, positive detection was achieved in a single individual female, egg‐mass and second stage juvenile of this nematode. This SCAR species‐specific marker for M. enterolobii represents a new molecular tool to be used in the detection of this nematode from field samples and as a routine diagnostic test for quarantine devices . 相似文献
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Bacteriostatic effect of flavonoids isolated from leaves of Psidium guajava on fish pathogens 总被引:1,自引:0,他引:1
The antimicrobial activity against fish bacterial pathogens of flavonoids (morin, morin-3-O-lyxoside, morin-3-O-arabinoside, quercetin, and quercetin-3-O-arabinoside) isolated from the leaves of Psidium guajava was evaluated. The flavonoids were shown to have bacteriostatic effect on all of the tested bacteria. 相似文献
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【目的】综合评价番石榴Psidium guajava不同品种间的果实品质差异并挖掘黄酮类化合物合成的关键基因。【方法】对番石榴6个品种的11个果实品质指标进行测定,并结合主成分分析方法综合评价其品质差异,运用转录组测序技术比较各品种间的差异表达基因(Differentially expressed gene, DEG),通过GO和KEGG富集分析,挖掘黄酮类化合物合成的DEG,利用实时荧光定量PCR (Quantitative real-time PCR,qRT-PCR)研究DEG在不同品种间的特异性表达。【结果】6种番石榴试材中‘金斗香’和‘胭脂红’品质最优,得分较高,‘水晶’和‘西瓜红’较低,‘珍珠’和‘红宝石’居中;‘金斗香’和‘胭脂红’的类黄酮质量分数较高,分别为9.76和10.05 mg/g,是‘水晶’(5.74 mg/g)的1.5倍以上,显著高于其他品种(P>0.05)。转录组测序分析显示,‘金斗香’和‘胭脂红’的DEG聚为一类,其余4种的DEG聚为一类。黄酮类化合物的生物合成途径中CHS、FLS、CYP73A、CYP98A3、DFR、E2.1.1.104、E1.14... 相似文献
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为了从细胞壁代谢角度研究1-甲基环丙烯(1-MCP)调控采后番石榴果实软化的机制,用1 μL/L 1-MCP处理‘红心’番石榴果实试材。通过测定果实的硬度、细胞壁代谢相关物质及相关酶活性的变化,研究1-MCP处理对常温(25±1℃)贮藏下番石榴果实软化的抑制作用。结果表明,1 μL/L 1-MCP处理使采后番石榴果实的硬度比对照组果实高0.51倍,并有效抑制多聚半乳糖醛酸酶、果胶甲酯酶、纤维素酶、β-葡萄糖苷酶、α-淀粉酶和β-淀粉酶的活性,减缓可溶性果胶、葡萄糖含量的增加,延缓原果胶、纤维素和淀粉含量在采后贮藏期间的下降。因此,1 μL/L 1-MCP处理能有效延缓采后‘红心’番石榴的软化进程,延长其采后贮运保鲜期。 相似文献