scholarly journals Effects of light, temperature, salinity, and maternal habitat on seed germination of Aeluropus lagopoides (Poaceae): an economically important halophyte of arid Arabian deserts

Botany ◽  
2020 ◽  
Vol 98 (2) ◽  
pp. 117-125 ◽  
Author(s):  
Arvind Bhatt ◽  
Sanjay Gairola ◽  
María Mercedes Carón ◽  
Andrea Santo ◽  
Valentina Murru ◽  
...  

In this study, salt tolerance during germination of Aeluropus lagopoides (L.) Trin. was tested using fresh seeds collected from three different maternal habitats under three thermoperiods and two light regimes. Additionally, we tested the ability of non-germinated seeds that had been exposed to different concentrations of NaCl to recover their germination in distilled water. The results showed a significant effect of seed source, temperature, and salinity, and some of their two- and three-way interactions on final germination and recovery percentage. The seeds from non-saline provenances had the highest percentages for germination (ca. 79%) under the 35/25 °C temperature regime, whereas the lowest percentages for germination (ca. 21%) was recorded for seeds from saline conditions under the 25/15 °C treatment. Additionally, percent germination was significantly lower for the seeds incubated in the saline solutions (100, 200, 400, and 600 mmol/L NaCl) and germinated under colder conditions (15/25 °C), compared with the seeds incubated in non-saline solutions (control group, 0 mmol/L NaCl) and germinated under warmer conditions (35/25 °C). The highest recovery percentage was recorded for seeds of the hyper-saline habitat incubated at 35/25 °C. Thus, seeds maintained their viability despite experiencing a range of saline conditions and were able to germinate upon the arrival of suitable conditions, which can be an adaptation to its saline arid desert habitat.

FLORESTA ◽  
2015 ◽  
Vol 45 (4) ◽  
pp. 845 ◽  
Author(s):  
Letícia Ramon De Medeiros ◽  
Manoela Andrade Monteiro ◽  
Patrícia Migliorini ◽  
Marilia Lazarotto ◽  
Lilian De Tunes

AbstractThe objective of this study was to evaluate the germination of Australian cedar seeds (Toona ciliata M. Roem) in three different substrates and two photoperiods and evaluate the effect of salt stress with sodium chloride (NaCl) on the viability and vigor of seeds, conducting two experiments. The first experiment was conducted in a constant temperature room at 25 C and two light regimes 12h 24h white light; and three substrates: sand, between paper and on paper. Evaluations were performed on the seventhand twenty-first day after sowing. Results were expressed as percentage of Normal Seedlings, Abnormal Seedlings and Dead Seeds, Number of True Leaves, Fresh, Dry Matter, Seedling Length and Root. The second experiment used constant 25 C and photoperiod of 12 hours light. With treatments T1 (0mM: distilled water); 25mMNaCl T2; T3 50mMNaCl; T4 and T5 100mMNaCl 75mMNaCl. We evaluated PCG, G, IVG, CP, CR. The photoperiod of 24h light, does not influence the final seed germination and the use of paper on substrate provided the highest percentage of germinated seeds. As to the effect of salt stress, the concentration of 50mMsalt, caused damage to the development of seedlings.ResumoPadronização do teste de germinação e resposta ao estresse salino por NaCl em sementes de Toona ciliata. O objetivo do trabalho foi avaliar a germinação de sementes de cedro australiano (Toona ciliata M. Roem) em três substratos com dois fotoperíodos e avaliar o efeito do estresse salino com cloreto de sódio (NaCl) na viabilidade e vigor de sementes. O experimento I foi conduzido em ambiente com temperatura constante a 25 ºC e dois regimes de luminosidade, 12h de 24h de luz branca; três substratos: areia, entre papel e sobre papel. As avaliações foram realizadas no sétimo e vigésimo primeiro dia após a semeadura. Os resultados expressos em porcentagem de Plântulas Normais, Plântulas Anormais e Sementes Mortas, número de Folhas Verdadeiras, Massa Fresca, Massa Seca, Comprimento de Plântula e Raiz. O experimento II utilizou temperatura constante a 25 ºC e fotoperíodo de 12 horas luz. Com os tratamentos T1 (0 mM: água destilada); T2 25 mMNaCl; T3 50 mMNaCl; T4 75 mMNaCl e T5 100 mMNaCl. Avaliando-se PCG, G, IVG, CP e CR. O fotoperíodo de 24h de luz, não influencia na germinação e o uso do substrato sobre papel proporcionou a maior germinação. Quanto ao efeito do estresse salino, a concentração de 20 mM de sal, prejudicou o desenvolvimento das plântulas.Palavras-chave: Sementes florestais; análise de sementes, vigor, salinidade.


2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Xiao Liang ◽  
Xue Tong ◽  
Hui-lan Du ◽  
Ming He ◽  
Yu Zhang ◽  
...  

Background. Bushen Tiaojing Decoctions (BSTJ-II-D and BSTJ-III-D) are used to assist pregnancy in clinical practice. In this study, we explored the ability of sequential administration of BSTJ-II-D and BSTJ-III-D to promote cumulus cell (CC) expansion and its underlying mechanisms in controlled ovarian hyperstimulation (COH) mice. Methods. Kunming mice were randomly divided into three groups. The normal group was injected intraperitoneally with saline, and distilled water was administered orally by gavage. As the COH model, mice were injected with GnRHa, eCG, and hCG. Subsequently, the BSTJD group received BSTJ-II-D and BSTJ-III-D orally by gavage, while the control group received distilled water. We evaluated CC expansion and oocyte first polar body (PB1) extrusion under a stereomicroscope. Serum levels of follicle-stimulating hormone (FSH) were detected by radioimmunoassay. The expression of the CC expansion-related factors PTX3 and PTGS2 was detected by immunofluorescence, western blot, and quantitative real-time-polymerase chain reaction analyses (qRT-PCR). Expression of p-MAPK14, p-MAPK3/1, MAPK14, and MAPK3/1 was detected by western blot analysis. Results. Sequential administration of BSTJ-II-D and BSTJ-III-D promoted cumulus expansion and oocyte PB1 extrusion and upregulated PTX3 and PTGS2 expression at the mRNA and protein levels. Furthermore, the levels of p-MAPK14/MAPK14, p-MAPK3/1/MAPK3/1 proteins, and serum FSH in the BSTJD group were higher than those in the normal and control groups. Conclusions. Sequential administration of BSTJ-II-D and BSTJ-III-D promotes cumulus expansion and oocyte maturation in COH mice by increasing FSH expression and activating the MAPK14 and MAPK3/1 signalling pathways, thereby increasing expression of PTX3 and PTGS2.


2016 ◽  
Vol 10 (1) ◽  
pp. 516-521 ◽  
Author(s):  
Vanessa Dias da Silva ◽  
Eduardo Martinelli S de Lima ◽  
Caroline Dias ◽  
Leandro Berni Osório

Proposition: The purpose of this study was to evaluate in vitro the color changes of esthetic orthodontic elastomeric ligatures of different shades when exposed to four food colorings commonly found in the diet of patients. Materials and Methods: The sample consisted of esthetic orthodontic elastomeric ligatures in the colors pearl, pearl blue, pearl white and colorless, which were immersed for 72 hours in five different solutions: distilled water (control group), coffee, tea, Coca-Cola ® and wine. The color changes of the esthetic orthodontic elastomeric ligatures were measured with the aid of a spectrophotometer, at T1 - as provided by the manufacturer; and T2 - after colorings process. Results: The results indicated that the esthetic orthodontic elastomeric ligatures of all initial hues are susceptible to pigmentation. Among the evaluated colors, all changed the finished look and the color of the samples tested. In ascending order, the color of the samples was as follows: distilled water, Coca-Cola®, black tea, wine and coffee. Conclusion: The substances that have a greater potential for pigmentation in esthetic orthodontic elastomeric ligatures were black tea, wine and coffee, respectively. All shades of esthetic orthodontic elastomeric ligatures are susceptible to color change.


2004 ◽  
Vol 12 (3) ◽  
pp. 200-204 ◽  
Author(s):  
Gisele Maria Correr ◽  
Angela S. Caldo-Teixeira ◽  
Roberta Caroline Bruschi Alonso ◽  
Regina Maria Puppin-Rontani ◽  
Mário Alexandre Coelho Sinhoreti ◽  
...  

The aim of this study was to evaluate the effect of saliva contamination (SCT) and re-etching time (RET) on the shear bond strength (SBS) of the Fluroshield sealant. Forty-five extracted third molars were sectioned and flattened until reach an enamel surface area. Then, all samples were etched for 30 sec with 35% phosphoric acid and then they were distributed into 9 groups (n=10) according to SCT and RET (seconds), respectively: G1- control (no SCT and no RET); G2- 30s and 0s; G3- 60s and 0s; G4-30s and 2s; G5- 30s and 5s; G6- 30s and 15s; G7-60s and 2s; G8- 60s and 5s; G9- 60s and 15s. The sealant was applied according to the manufacturer's instructions. The samples were stored in distilled water at 37ºC for 72h and subjected to the SBS test. The results indicated that there was no statistically significant difference between the groups (p>0.05). However, it could be noticed that: 1- the longer the SCT, the lower the SBS values; 2 - the longer the RET, the higher the SBS values. It could be concluded that there was a tendency to the shortest SCT (30s) associated to the longest RET (5 and 15s) to reach similar SBS values for the control group.


Toxins ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 449 ◽  
Author(s):  
Nan Wang ◽  
Peng Li ◽  
Mingyang Wang ◽  
Si Chen ◽  
Sheng Huang ◽  
...  

Zearalenone (ZEN) is an estrogen-like mycotoxin produced by Fusarium that seriously compromises the safety of animal and human health. In this study, our aim was to evaluate the protective effect of Bacillus velezensis A2 against biochemical and pathological changes induced by zearalenone in mice. Kunming mice (n = 40; 25 ± 2 g) were allotted to four treatment groups: a control group (basic feed); a ZEN group (basic feed with a ZEN dose of 60 mg/kg); an A2 strain fermented feed group (150 g of feed mixed with 150 mL of sterile distilled water and inoculated with 5 mL of phosphate buffer salt (PBS) resuspended A2 strain); and an A2 strain fermented ZEN-contaminated feed group. (A2 strain group 150 mL pure bacterial distilled water system mixed with 150 g ZEN-contaminated feed.) Our results showed that the Bacillus velezensis A2 strain can completely degrade the ZEN-contaminated feed within 5 days. (The concentration of ZEN in fermentation was 60 μg/mL.) After the mice fed for 28 days, compared with the control group, the activities of AST and ALT were increased, the activities of glutathione peroxidase (GSH-PX) and total superoxide dismutase (T-SOD) were decreased, and the amount of creatinine (CRE), blood urea nitrogen (BUN), uric acid (UA), and malondialdehyde (MDA) in the ZEN group were increased in the mice serum (p < 0.05; p < 0.01). However, compared with the ZEN group, these biochemical levels were reversed in the A2 strain fermented feed group and in the A2 strain fermented ZEN-contaminated feed group (p < 0.05; p < 0.01). Furthermore, histopathological analysis only showed pathological changes of the mice liver in the ZEN group. The results showed that Bacillus velezensis A2 as additive could effectively remove ZEN contamination in the feed and protect the mice against the toxic damage of ZEN. In conclusion, Bacillus velezensis A2 has great potential use as a microbial feed additive to detoxify the toxicity of zearalenone in production practice.


Author(s):  
Nasima Iqbal ◽  
ATA UR Rehman ◽  
Syeda Amber Zaidi ◽  
Kiran Khan ◽  
Lubna Farooq ◽  
...  

Background: Dental infections were caused by the bacterium overgrowth on the surface of the tooth, and treatment should always be set up to prevent this development.Antibiotics have long been used as a conventional antibacterial medication, but their overuse has resulted in microbes gaining resistance to many of the antibiotics, trying to make many commercialized therapeutic remedies ineffectual and resulting to infection recurrence. In this regard we aim to analyze the antibacterial activity of nigella sativa seeds’ and fenugreek seed extract rinses against S. mutans' colonies. Methodology: It was a preclinical experimental study conducted at Baqai Medical and Dental College Karachi., from January - June 2021. Calculated sample size was n = 80 Consecutive sampling technique was used. Plaque of study participants was collected on sterile strips that was transported to laboratory for culture in sterile containers.The extract of Fenugreek seed and nigella sativa seed was kept in an airtight bottle and stored in a refrigerator till usage. The extracts were diluted in distilled water in 1:4 (Extract: Distilled water). Study participants were instructed to not brush their teeth before sampling. Study participants were divided into four groups (negative control, positive control, fenugreek seed extract group and Nigella sativa group) each group had 20 participants. Diluted Fenugreek seed extract and Nigella sativa extract was given to experimental groups for rinses. Results: There was significant decrease in number of colonies in positive controls, fenugreek seed extract group and nigella sativa extract group and there was no change in number of colonies in control group. Furthermore, the analysis showed significant (p-value = 0.001) difference among the groups followed by post hoc analysis. Post hoc analysis showed no difference between positive control, fenugreek seed extract group and nigella sativa group. Conclusion: Fenugreek seed extract and Nigella Sativa seed extract showed comparable antibacterial properties. Also, the effect was found to be similar to commercially available mouth rinse.


Plant Disease ◽  
2014 ◽  
Vol 98 (12) ◽  
pp. 1745-1745 ◽  
Author(s):  
R. Pedrozo ◽  
C. R. Little

A three-year survey from 2010 to 2012 was conducted in Kansas to investigate the identity and diversity of seedborne Fusarium spp. in soybean. A total of 408 soybean seed samples from 10 counties were tested. One hundred arbitrarily selected seeds from each sample were surface-sterilized for 10 min in a 1% sodium hypochlorite solution to avoid contaminants and promote the isolation of internal fusaria. Seeds were rinsed with sterile distilled water and dried overnight at room temperature (RT). Surface-sterilized seeds were plated on modified Nash-Snyder medium and incubated at 23 ± 2°C for 7 days. Fusarium isolates were single-spored and identified by morphological characteristics on carnation leaf agar (CLA) and potato dextrose agar (PDA) (3). From 276 seedborne Fusarium isolates, six were identified as F. thapsinum (2). On CLA, F. thapsinum isolates produced abundant mycelium and numerous chains of non-septate microconidia produced from monophialides. Microconidia were club-shaped and some were napiform. No chlamysdospores were found. On PDA, three of the isolates presented characteristic dark yellow pigmentation and three were light violet. Confirmation of the isolates to species was based on sequencing of an elongation factor gene (EF1-α) segment using primers EF1 and EF2 and the beta-tubulin gene using primers Beta1 and Beta2 (1). Sequence results (~680 bp, EF primers; ~600 bp, beta-tubulin primers) were confirmed by using the FUSARIUM-ID database (1). All isolates matched F. thapsinum for both genes sequenced (Accession No. FD01177) at 99% identity. Koch's postulates were completed for two isolates of F. thapsinum under greenhouse conditions. Soybean seeds (Asgrow AG3039) were imbibed with 2.5 × 105 conidia ml−1 for 48 h. After inoculation, seeds were dried for 48 h at RT. One isolate each of F. equiseti and F. oxysporum were used as the non-pathogenic and pathogenic inoculation controls, respectively. In addition, non-inoculated seeds and seeds imbibed in sterile distilled water (mock) were also used. Twenty-five seeds from each treatment were planted in pots (500 ml) with autoclaved soil and vermiculite (1:1). The experiment was a completely randomized design with three replicates (pots) per isolate. The entire experiment was repeated three times. After 21 days, aggressiveness of both F. thapsinum isolates was assessed using initial stand (%), final stand (%), and seed mortality (% of non-germinated seeds). Both seedborne F. thapsinum isolates caused reduced emergence and final stand, and increased seedling mortality when compared to the non-inoculated and F. equiseti controls (P< 0.0001). No significant difference was observed between F. thapsinum isolates and F. oxysporum. F. thapsinum isolates were re-isolated from wilted seedlings and non-germinated seeds, but not from the control treatments. Typically, F. thapsinum is considered a pathogen of sorghum, but it has also been recovered from bananas, peanuts, maize, and native grasses (3). However, its presence on soybean plant tissues and its pathogenicity has never been reported. To our knowledge, this is the first report of seedborne F. thapsinum and its pathogenicity on soybean in the United States. References: (1) D. M. Geiser et al. Eur. J. Plant Pathol. 110:473, 2004. (2) C. J. R. Klittich et al. Mycologia 89:644, 1997. (3) J. F. Leslie and B. A. Summerell. The Fusarium Laboratory Manual. Blackwell Publishing, Oxford, UK, 2006.


2015 ◽  
Vol 9 (1) ◽  
pp. 16-22 ◽  
Author(s):  
A Gupta ◽  
V Goyal ◽  
J Duhan ◽  
S Hans ◽  
P Sangwan

ABSTRACT Aim In the present study, the role of three plant extracts as irrigant in root canal cleaning after instrumentation was evaluated. The effect of Syzygium aromaticum (S. Aromaticum), Ocimum sanctum (O. Sanctum) and Cinnamomum zeylanicum (C. zeylanicum) plant extracts was evaluated in smear layer removal. Methods The study was divided into different groups having 5 teeth each using various irrigating agents to evaluate smear layer removal. Group A: O. Sanctum extract; group A1: O. Sanctum extract with EDTA, group B: S. Aromaticum extract; group B1 S. Aromaticum extract with EDTA, group C: C. zeylanicum extract; group C1 C. zeylanicum extract with EDTA and two control group of 5 teeth each in group D: 3% NaOCl; group D1 3% NaOCl with EDTA (as positive control) and group E: Distilled water (as negative control); group E1 3% Distilled water with EDTA. Each tooth was split longitudinally and prepared for examination by scanning electron microscopy. Results The herbal extracts were effective in cleaning root canal walls when combine with EDTA with maximum activity of S. Aromaticum extract with EDTA group. Conclusion Under the condition of present study the three herbal plant extracts were ineffective in removal of smear layer when used alone.


2011 ◽  
Vol 26 (2) ◽  
pp. 126-133 ◽  
Author(s):  
Uma Gupta ◽  
Ranu Chaudhary ◽  
Pradeep Goyal

The present study deals with the protective effect of Alstonia scholaris extract against radiation-induced hematological alterations. Swiss albino male mice were selected from an inbred colony and divided into four groups. The first group received only double distilled water orally, served as vehicle control and the second group were administered the Alstonia scholaris extract at a dose of 100 mg/kg body weight per day dissolved in the double distilled water. The third group was administered the double distilled water, which served as irradiated control while the fourth group was administered the Alstonia scholaris extract once in a day for five consecutive days. Groups third and fourth were exposed to 7.5 Gy of gamma radiation after half an hour of 5th day of double distilled water or Alstonia scholaris extract administration, respectively. The animals were autopsied at 12 hours, days: 1st, 3rd, 7th, 15th, and 30th post-exposure for hematological evaluation. The extract was found to restore the total leucocytes and differential leucocytes (lymphocytes, monocytes, neutrophils, and non-neutrophilic granulocytes) count in the Alstonia scholaris extract pretreated animals as compared to the irradiated control group. The data clearly indicate that the Alstonia scholaris extract significantly reduced the deleterious bioeffects of radiation on peripheral blood.


2018 ◽  
Vol 54 (2) ◽  
pp. 84 ◽  
Author(s):  
Widayati Agustina ◽  
Widjiati Widjiati ◽  
Alfiah Hayati

This study aimed to determine the effects of red fruit (Pandanus conoideus Lam) oil on MDA levels and spermatozoa quality in mice (Mus musculus) exposed to MSG. The quality includes motility, viability, concentration, and morphology of spermatozoa. This experimental study used randomized post-test only control group design. The subjects of this study were 25 mice (Mus musculus), divided into 5 groups (5 mice per group). K- group received distilled water for 35 days. K+ group received 4 mg/g BW MSG for 21 days. P1, P2, and P3 treatment groups received 4 mg/g BW MSG for 21 days and 0.02; 0.04; 0.08 ml/g BW red fruit oil, respectively, from day 22 to 35. The results showed that mean spermatozoa morphology in K-, K+, P1, P2, P3 groups were as follows: 0.86; 0.56; 0.67; 0.61; and 0.87 (%). The spermatozoa concentrations were sequentially as follows: 21; 10; 15; 32,8,19 (107 cells/ml). The spermatozoa's vitalities were as follows: 0,64; 0,14; 0,24; P2: 0.36; 0.68 (%). MDA levels were respectively: 0.29; 0.60; 0.35; 0.23; and 0.19 (nm). As a conclusion, testicular MDA levels in mice exposed to MSG and given with red fruit oil were lower than those in mice exposed to MSG without receiving red fruit oil. The quality of spermatozoa in mice exposed to MSG and receiving red fruit oil was higher than that of mice exposed to MSG without being given with red fruit oil.


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