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Pesquisa : B01.650.940.800.575.912.250.618.050.625.777 [Categoria DeCS]
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  1 / 44 MEDLINE  
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PMID:27687794
Autor:Lyu N; Du W; Wang XF
Endereço:College of Life Sciences, Wuhan University, Wuhan, China.
Título:Unique growth paths of heterospecific pollen tubes result in late entry into ovules in the gynoecium of Sagittaria (Alismataceae).
Fonte:Plant Biol (Stuttg); 19(2):108-114, 2017 Mar.
ISSN:1438-8677
País de publicação:England
Idioma:eng
Resumo:Pollen-pistil interactions are a fundamental process in the reproductive biology of angiosperms and play a particularly important role in maintaining incipient species that exist in sympatry. However, the majority of previous studies have focused on species with syncarpous gynoecia (fused carpels) and not those with apocarpous gynoecia (unfused carpels). In the present study, we investigated the growth of conspecific pollen tubes compared to heterospecific pollen tubes in Sagittaria species, which have apocarpous gynoecia. We conducted controlled pollinations between S. pygmaea and S. trifolia and observed the growth of conspecific and heterospecific pollen tubes under a fluorescence microscope. Heterospecific and conspecific pollen tubes arrived at locules within the ovaries near simultaneously. However, conspecific pollen tubes entered into the ovules directly, whereas heterospecific tubes passed through the carpel base and adjacent receptacle tissue, to ultimately fertilize other unfertilized ovules. This longer route taken by heterospecific pollen tubes therefore caused a delay in the time required to enter into the ovules. Furthermore, heterospecific pollen tubes displayed similar growth patterns at early and peak pollination. The growth pattern of heterospecific pollen tubes at late pollination was similar to that of conspecific pollen tubes at peak pollination. Heterospecific and conspecific pollen tubes took different routes to fertilize ovules. A delayed entry of heterospecific pollen into ovules may be a novel mechanism of conspecific pollen advantage (CPA) for apocarpous species.
Tipo de publicação: JOURNAL ARTICLE


  2 / 44 MEDLINE  
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PMID:27738710
Autor:Zhang SH; Xu PY; Chang JJ
Endereço:College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, China.
Título:Physiological Responses of Aphanizomenon flos-aquae Under the Stress of Sagittaria sagittifolia Extract.
Fonte:Bull Environ Contam Toxicol; 97(6):870-875, 2016 Dec.
ISSN:1432-0800
País de publicação:United States
Idioma:eng
Resumo:The algal growth and physiological characters of Aphanizomenon flos-aquae were studied under the stress of Sagittaria sagittifolia extract. The results showed that the growth of A. flos-aquae was significantly inhibited by S. sagittifolia extract. The exopolysaccharide (EPS), total soluble protein, intracellular phosphorus (o-PO -P) contents and malondialdehyde (MDA) contents in A. flos-aquae cells increased significantly. These results suggested that A. flos-aquae can adapt to stress by increasing its normal metabolic activity. The algal cellular antioxidant enzymes, superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD), were triggered to different degrees when exposed to S. sagittifolia extract. The MDA contents and activities of SOD, CAT and POD in algal cells suggested that oxidative damage induced by S. sagittifolia extract via the oxidation of ROS (O · ) might be an important factor responsible for the inhibition of the growth of A. flos-aquae. In addition, SOD may be an important site for the inhibition of S. sagittifolia extract on A. flos-aquae cells. These results indicate that S. sagittifolia may be a good candidate for controlling A. flos-aquae blooms.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Antioxidants); 0 (Plant Extracts); 0 (Polysaccharides); 0 (Proteins); 27YLU75U4W (Phosphorus); 4Y8F71G49Q (Malondialdehyde); EC 1.11.1.6 (Catalase); EC 1.11.1.7 (Peroxidase); EC 1.15.1.1 (Superoxide Dismutase)


  3 / 44 MEDLINE  
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PMID:27155407
Autor:Li J; Liu Y; Zhang P; Zeng G; Cai X; Liu S; Yin Y; Hu X; Hu X; Tan X
Endereço:College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China. Electronic address: lijiang1304@163.com.
Título:Growth inhibition and oxidative damage of Microcystis aeruginosa induced by crude extract of Sagittaria trifolia tubers.
Fonte:J Environ Sci (China); 43:40-47, 2016 May.
ISSN:1001-0742
País de publicação:Netherlands
Idioma:eng
Resumo:Aquatic macrophytes are considered to be promising in controlling harmful cyanobacterial blooms. In this research, an aqueous extract of Sagittaria trifolia tubers was prepared to study its inhibitory effect on Microcystis aeruginosa in the laboratory. Several physiological indices of M. aeruginosa, in response to the environmental stress, were analyzed. Results showed that S. trifolia tuber aqueous extract significantly inhibited the growth of M. aeruginosa in a concentration-dependent way. The highest inhibition rate reached 90% after 6 day treatment. The Chlorophyll-a concentration of M. aeruginosa cells decreased from 343.1 to 314.2µg/L in the treatment group. The activities of superoxide dismutase and peroxidase and the content of reduced glutathione in M. aeruginosa cells initially increased as a response to the oxidative stress posed by S. trifolia tuber aqueous extract, but then decreased as time prolonged. The lipid peroxidation damage of the cyanobacterial cell membranes was reflected by the malondialdehyde level, which was notably higher in the treatment group compared with the controls. It was concluded that the oxidative damage of M. aeruginosa induced by S. trifolia tuber aqueous extract might be one of the mechanisms for the inhibitory effects.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Plant Extracts); 0 (Reactive Oxygen Species); 1406-65-1 (Chlorophyll); 4Y8F71G49Q (Malondialdehyde); EC 1.- (Oxidoreductases); EC 1.15.1.1 (Superoxide Dismutase); GAN16C9B8O (Glutathione); YF5Q9EJC8Y (chlorophyll a)


  4 / 44 MEDLINE  
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PMID:27150128
Autor:Yakimowski SB; Barrett SC
Endereço:Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, Ontario, M5S 3B2, Canada. sarah.yakimowski@queensu.ca.
Título:The role of hybridization in the evolution of sexual system diversity in a clonal, aquatic plant.
Fonte:Evolution; 70(6):1200-11, 2016 Jun.
ISSN:1558-5646
País de publicação:United States
Idioma:eng
Resumo:The stable coexistence within populations of females, males, and hermaphrodites (subdioecy) is enigmatic because theoretical models indicate that maintenance of this sexual system involves highly restricted conditions. Subdioecy is more commonly interpreted as a transitory stage along the gynodioecious pathway from hermaphroditism to dioecy. The widespread, North American, aquatic plant Sagittaria latifolia is largely composed of monoecious or dioecious populations; however, subdioecious populations with high frequencies of hermaphrodites (mean frequency = 0.50) characterize the northern range boundary of dioecy in eastern North America. We investigated two hypotheses for the origin of subdioecy in this region. Using polymorphic microsatellite loci, we evaluated whether subdioecy arises through selection on standing genetic variation for male sex inconstancy in dioecious populations, or results from hybridization between monoecious and dioecious populations. We found evidence for both pathways to subdioecy, although hybridization was the more common mechanism, with genetic evidence of admixture in nine of 14 subdioecious populations examined. Hybridization has also played a role in the origin of androdioecious populations in S. latifolia, a mechanism not often considered in the evolution of this rare sexual system. Our study demonstrates how hybridization has the potential to play a role in the diversification of plant sexual systems.
Tipo de publicação: JOURNAL ARTICLE


  5 / 44 MEDLINE  
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PMID:27082515
Autor:Li A; Zhang Y; Zhang Y; Yu X; Xiong F; Zhou R; Zhang Y
Endereço:Jiangsu Lixiahe District Inst. of Agricultural Science, Yangzhou, 225007, China.
Título:Comparison of Morphology and Physicochemical Properties of Starch Among 3 Arrowhead Varieties.
Fonte:J Food Sci; 81(5):C1110-7, 2016 May.
ISSN:1750-3841
País de publicação:United States
Idioma:eng
Resumo:Arrowhead (Sagittaria trifolia var. sinensis) is a source of starch worldwide, but arrowhead starch has been rarely studied. In this work, starch was separated from arrowhead corm. The morphology and physicochemical properties of starch were then investigated and compared among 3 different arrowhead varieties (Purple-corm, Hongta, and Japanese). Results showed that starches from the 3 varieties similarly featured an oval shape containing a visible polarization cross, a CA -type crystalline structure, and an ordered structure in the external granule region. However, starch content, granule size, crystal characteristics, and pasting properties differed among the 3 varieties. Japanese arrowhead exhibited the highest starch content and degree of ordered structure in the external granule region, as well as onset, peak, and final gelatinization temperature. Purple-corm arrowhead starch demonstrated the highest amylose content and relative degree of crystallinity, smallest granule size, and lowest swelling power and solubility. Purple-corm arrowhead starch also showed the highest gelatinization enthalpy, as well as peak, trough, final, and setback viscosities. This starch further presented the lowest breakdown viscosity and degree of hydrolysis by HCl and porcine pancreatic α-amylase. These findings can provide useful references for arrowhead variety selection in food and nonfood industries.
Tipo de publicação: COMPARATIVE STUDY; JOURNAL ARTICLE
Nome de substância:9005-25-8 (Starch); 9005-82-7 (Amylose); EC 3.2.1.1 (Pancreatic alpha-Amylases)


  6 / 44 MEDLINE  
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PMID:26616959
Autor:Wani IA; Gani A; Tariq A; Sharma P; Masoodi FA; Wani HM
Endereço:Department of Food Science & Technology, University of Kashmir, Srinagar 190006, India. Electronic address: idwani07@gmail.com.
Título:Effect of roasting on physicochemical, functional and antioxidant properties of arrowhead (Sagittaria sagittifolia L.) flour.
Fonte:Food Chem; 197(Pt A):345-52, 2016 Apr 15.
ISSN:0308-8146
País de publicação:England
Idioma:eng
Resumo:Arrowhead tubers with protein, lipid and ash content of 4.60%, 2.27% and 6.15%, respectively were subjected to pan and microwave roasting, converted to flour and studied for physicochemical, functional and antioxidant properties. The lightness 'L' of flour decreased significantly (p⩽0.05) from 83.01 to 72.21 while significant increase in 'a' and 'b' color values was observed from -0.27 to 2.49 and 15.49 to 25.35 on roasting. Light transmittance decreased significantly upon roasting and the lowest value (0.80) was showed by pan roasted sample. Significant decrease in pasting properties like peak (963.0-147.7 cP), setback (172.0-97.67 cP) and final viscosity (861.67-202.66 cP) was also recorded on roasting. However, roasting led to increase in pasting temperature from 78.53 to 95.23°C. The water (1.49-2.03 g/g) and oil (1.65-1.85 g/g) absorption capacity increased, while significant decrease was observed in foaming and emulsion properties upon roasting. The total phenolic content, antioxidant activity and reducing power enhanced upon pan and microwave roasting from 1.02 to 2.42 mg/g (GAE); 44.30% to 46.61%; 74.59% to 76.23%, respectively. Thermal parameters like onset temperature (To) and ΔH decreased while peak temperature (Tp) increased on roasting.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Antioxidants); 0 (Phenols); 0 (Plant Extracts); 059QF0KO0R (Water)


  7 / 44 MEDLINE  
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PMID:27112030
Autor:Qin DF; Li T; Dai C
Título:[Factors affecting the estimation of pollen limitation in Sagittaria trifolia].
Fonte:Ying Yong Sheng Tai Xue Bao; 26(12):3865-70, 2015 Dec.
ISSN:1001-9332
País de publicação:China
Idioma:chi
Resumo:This study explored whether the degree of pollen limitation was affected by the experimental level (a single flower or inflorescence) and pollen quality (self-pollen or outcross-pollen) of supplemental pollination in Sagittaria trifolia. The results showed that the experimental level caused varying degree of pollen limitation. Compared with the inflorescence level, pollination at the single flower level led to a redistribution of resources among flowers, therefore affecting seed numbers. Pollen quality also played a vital role in the estimation of pollen limitation. Compared with self-pollen, supplemental pollination with outcross-pollen resulted in significantly more seeds and a higher germination rate. This proved that in the research system the reproduction was limited by pollen quality rather than quantity. Our study revealed that both experimental level and pollen quality had effects on the estimation of pollen limitation. It was suggested that in future studies we should evaluate pollen limitation at the inflorescence or whole plant level, and also consider comparing self- and outcross-pollen when applicable.
Tipo de publicação: ENGLISH ABSTRACT; JOURNAL ARTICLE


  8 / 44 MEDLINE  
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PMID:26453234
Autor:Wei S; Li P; Ji M; Dong Q; Wang H
Endereço:College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China.
Título:Target-site resistance to bensulfuron-methyl in Sagittaria trifolia L. populations.
Fonte:Pestic Biochem Physiol; 124:81-5, 2015 Oct.
ISSN:1095-9939
País de publicação:United States
Idioma:eng
Resumo:Sagittaria trifolia L. is one of the most serious weeds in paddy fields in northeast of China and cannot be controlled effectively by bensulfuron-methyl in recent years. In this study, two suspected resistant S. trifolia populations (R1 and R2) were collected in Liaoning province of China. Whole-plant dose-response studies showed that R1 and R2 were highly resistant to bensulfuron-methyl, with the GR50 R/S ratios of 76.99 and 49.94 respectively. In vitro acetolactate synthase (ALS) assays revealed that resistance was due to reduced sensitivity of the ALS to bensulfuron-methyl inhibition, with I50 R/S ratios of 81.86 and 67.48 for R1 and R2, respectively. Total ALS activity was similar for the S and R2 populations, whereas the R1 population displayed significantly higher ALS activity than did the S population. The mutations Pro-197-Leu and Pro-197-Ser were identified in the ALS gene of the R1 and R2 populations, respectively. This is the first report examining bensulfuron-resistant S. trifolia in Liaoning province, China. The Pro197 mutation is likely responsible for resistance to bensulfuron-methyl in S. trifolia populations.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
Nome de substância:0 (Herbicides); 0 (Sulfonylurea Compounds); 83055-99-6 (methyl bensulfuron); EC 2.2.1.6 (Acetolactate Synthase)


  9 / 44 MEDLINE  
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PMID:26371504
Autor:Ravu RR; Jacob MR; Jeffries C; Tu Y; Khan SI; Agarwal AK; Guy RK; Walker LA; Clark AM; Li XC
Título:LC-MS- and (1)H NMR Spectroscopy-Guided Identification of Antifungal Diterpenoids from Sagittaria latifolia.
Fonte:J Nat Prod; 78(9):2255-9, 2015 Sep 25.
ISSN:1520-6025
País de publicação:United States
Idioma:eng
Resumo:Antifungal screening of small-molecule natural product libraries showed that a column fraction (CF) derived from the plant extract of Sagittaria latifolia was active against the fungal pathogen Cryptococcus neoformans. Dereplication analysis by liquid chromatography-mass spectrometry (LC-MS) and proton nuclear magnetic resonance spectroscopy ((1)H NMR) indicated the presence of new compounds in this CF. Subsequent fractionation of the plant extract resulted in the identification of two new isopimaradiene-type diterpenoids, 1 and 2. The structures of 1 and 2 were determined by chemical methods and spectroscopic analysis as isopimara-7,15-dien-19-ol 19-O-α-l-arabinofuranoside and isopimara-7,15-dien-19-ol 19-O-α-l-(5'-acetoxy)arabinofuranoside, respectively. Compound 1 exhibited IC50 values of 3.7 and 1.8 µg/mL, respectively, against C. neoformans and C. gattii. Its aglycone, isopimara-7,15-dien-19-ol (3), resulting from acid hydrolysis of 1, was also active against the two fungal pathogens, with IC50 values of 9.2 and 6.8 µg/mL, respectively. This study demonstrates that utilization of the combined LC-MS and (1)H NMR analytical tools is an improved chemical screening approach for hit prioritization in natural product drug discovery.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Antifungal Agents); 0 (Diterpenes); 0 (Glycosides); 0 (Pyridones); 0 (Small Molecule Libraries); 0 (isopimara-7,15-dien-19-ol 19-O-alpha-L-(5'-acetoxy)arabinofuranoside); 0 (isopimara-7,15-dien-19-ol 19-O-alpha-L-arabinofuranoside); 0 (tolypyridone A)


  10 / 44 MEDLINE  
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PMID:26067251
Autor:Zhang X; Wang J; Liu X; Gu L; Hou Y; He C; Chen X; Liang X
Endereço:a School of Environmental and Chemical Engineering, Shanghai University , Shanghai , China.
Título:Potential of Sagittaria trifolia for Phytoremediation of Diesel.
Fonte:Int J Phytoremediation; 17(12):1220-6, 2015.
ISSN:1549-7879
País de publicação:United States
Idioma:eng
Resumo:The phytoremediation potential and responses of Sagittaria trifolia to diesel were investigated. In order to elucidate the biochemical and physiological responses of S. trifolia to diesel, the chlorophyll content, root vitality, soluble protein content and antioxidant enzymes activity (peroxidase (POD), catalase (CAT) and antioxidant enzymes superoxide dismutase (SOD)) were determined in the plant tissues after 50 d of diesel treatment. The results showed the presence of S. trifolia significantly improved the removal ratios of diesel, from 21∼36% in the control soils to 54∼85% in the planted soils. The chlorophyll content, root vitality and soluble protein content all increased at low diesel concentration, then decreased at high diesel concentration. The activities of CAT and POD exhibited peak values at 5 g·kg(-1) diesel treatment and declined at higher diesel concentrations. However, the activity of SOD kept stable at lower diesel concentration (1 and 5 g·kg(-1)), and also declined at higher diesel concentration. Collectively, S. trifolia had the ability to tolerate certain amount of diesel, but when the concentration was up to 10 g·kg(-1), the growth of S. trifolia would be restrained. The results also showed that variation of antioxidant enzyme activity was an important response in plants to diesel pollution.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
Nome de substância:0 (Antioxidants); 0 (Gasoline)



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