scholarly journals IDENTIFICATION OF ENDOPHYTIC BACTERIA OF SEEDS FROM Cedrela odorata L. (Meliaceae) WITH BIOTECHNOLOGICAL CHARACTERISTICS

2021 ◽  
Vol 26 (2) ◽  
pp. 196-206
Author(s):  
Saúl Espinosa Zaragoza ◽  
Ricardo Sánchez Cruz ◽  
Diana Sanzón Gómez ◽  
Margarita C Escobar Sandoval ◽  
Gustavo Yañez Ocampo ◽  
...  
Keyword(s):  
Plant Growth ◽  
Endophytic Bacteria ◽  
Carbon Sources ◽  
Phytopathogenic Fungi ◽  
Ribosomal Gene ◽  
Cedrela Odorata ◽  
Bacterial Strains ◽  
Isolation And Identification ◽  
Xenobiotic Compounds ◽  
Phosphate Solubilizing

In the present study, 62 endophytic bacterial strains of cedar seeds (Cedrela odorataL.), collected in the municipalities of Huehuetán, Motozintla, and Pijijiapan in the state of Chiapas, Mexico were isolated. The goal was to identify characteristics of biotechnological interest such as biocontrol, promotion of plant growth, and growth in aromatic compounds. The strains were identified by the partial sequence of the 16S ribosomal gene as belonging to the Bacillusgenus. The biocontrol capacity of phytopathogenic fungi, production of indoleacetic acid (IAA), solubilization of phosphate, and growth in xenobiotic compounds (phenanthrene, benzene, anthracene, or phenol) were detected in 26 strains of the 62 isolates. 21 % of the strains inhibited the mycelial growth of Alternaria solaniand Fusariumsp., and 13 % of the Phytophthora capsicioomycete. IAA production was detected in 24 isolates, phosphate solubilizing activity was identified in 18 isolates, while the ability to grow in the presence of phenanthrene and benzene was found in 26 isolates; 24 isolates grew in the presence of anthracene and only two isolates grew in phenol as the only carbon sources. This is the first report of the isolation and identification of endophytic bacteria from cedar seeds, where biotechnological characteristics were detected for biological control, promotion of plant growth, and growth in the presence of xenobiotic compounds.

scholarly journals Isolation and Identification of Endophytic Bacteria from Mycorrhizal Tissues of Terrestrial Orchids from Southern Chile

Diversity ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 55 ◽  
Author(s):  
Héctor Herrera ◽  
Tedy Sanhueza ◽  
Alžběta Novotná ◽  
Trevor C. Charles ◽  
Cesar Arriagada
Keyword(s):  
Plant Growth ◽  
Endophytic Bacteria ◽  
Developmental Stages ◽  
Pathogenic Fungi ◽  
Southern Chile ◽  
Bacterial Strains ◽  
Isolation And Identification ◽  
Acetic Acid Production ◽  
Terrestrial Orchids ◽  
Plant Growth Promoting

Endophytic bacteria are relevant symbionts that contribute to plant growth and development. However, the diversity of bacteria associated with the roots of terrestrial orchids colonizing Andean ecosystems is limited. This study identifies and examines the capabilities of endophytic bacteria associated with peloton-containing roots of six terrestrial orchid species from southern Chile. To achieve our goals, we placed superficially disinfected root fragments harboring pelotons on oatmeal agar (OMA) with no antibiotic addition and cultured them until the bacteria appeared. Subsequently, they were purified and identified using molecular tools and examined for plant growth metabolites production and antifungal activity. In total, 168 bacterial strains were isolated and assigned to 8 OTUs. The orders Pseudomonadales, Burkholderiales, and Xanthomonadales of phylum Proteobacteria were the most frequent. The orders Bacillales and Flavobacteriales of the phylla Firmicutes and Bacteroidetes were also obtained. Phosphate solubilization was detected in majority of isolates; however, it was significantly higher in Collimonas pratensis and Chryseobacterium sp. (PSI = 1.505 ± 0.09 and 1.405 ± 0.24, respectively). Siderophore production was recorded only for C. pratensis (0.657 ± 0.14 mm day−1), Dyella marensis (0.131 ± 0.02 mm day−1), and Luteibacter rhizovicinus (0.343 ± 0.12 mm day−1). Indole acetic acid production was highly influenced by the isolate identity; however, the significantly higher activity was recorded for Pseudomonas spp. (ranging from 5.507 ± 1.57 µg mL−1 to 7.437 ± 0.99 µg mL−1). Additionally, six bacterial isolates were able to inhibit the growth of some potential plant pathogenic fungi. Our findings demonstrate the potential for plant growth promoting capabilities and some antifungal activities of endophytic bacteria inhabiting the mycorrhizal tissue of terrestrial orchids, which may contribute especially at early developmental stages of orchid seedlings.

scholarly journals Isolation and identification of phosphate solubilizing bacteria and evaluate its effect on of Mung bean (Vigna radita [L.] R.Wilczek) growth

2019 ◽  
Vol 60 (5) ◽  
pp. 985-995
Author(s):  
Yusur Ramzi ◽  
Hutaf A. A. Alsalim
Keyword(s):  
Plant Growth ◽  
Bacillus Cereus ◽  
Mung Bean ◽  
Phosphate Solubilization ◽  
Growth Promotion ◽  
Hydrolytic Enzymes ◽  
Phosphate Solubilizing Bacteria ◽  
Biochemical Tests ◽  
Isolation And Identification ◽  
Phosphate Solubilizing

Sixteen soil samples were collected from wheat, barley and yellow corn rhizosphere in Abu-Ghraib, Aqraqof, Latifieh,Tarmiah, Jadriya and  of Agriculture in Baghdad university/ Baghdad city. The results found nine phosphate solubilizing bacteria (PSB) isolates (Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9), formed clear zones on National Botanical Research Institute's (NBRIP) agar. The solubility index (SI) of PSB isolates ranged from 2.00 to 3.66. Y4 have the highest SI (3.66) followed by Y3 and Y6 (3.33). Phosphate solubilization abilities varying from (20.10-39.00 μg.ml-1), Y4 was the highest (39.00 μg.ml-1) followed by Y3 (37.00μg.ml-1). The results of hydrolytic enzymes production showed that almost all nine isolates are able to produce protease and pectinase, while Y1 and Y2 showed negative results in cellulase production. Maximum ability for hydrogen cyanide (HCN) and indole acetic acid (IAA) production were showed byY3 and Y4 isolates. The isolate Y4 was found to be the most efficient isolate, so it was selected identified as Bacillus cereus using biochemical tests confirmed by VITEC 2 compact system. The results of High performance liquid chromatography (HPLC) revealed that Bacillus cereus produce oxalic acid (2.996), citric acid (9.117) and malic acid (3.734). Bacillus cereus (Y4) enhanced the growth of mung bean plants. A significant increase in branches number (12.33), plant length (83.0cm), fresh weight (27.25 g) and dry weight (1.427g) were obtained compared with control treatments. The main objective of this study is to isolate PSB and evaluate their roles in plant growth promotion. The results showed the high phosphate solubilization efficiency of PSB isolates and the identified isolates was found to be good enough for plant growth promoting.

scholarly journals Improvement Salt Tolerance of Safflower Plants by Endophytic Bacteria

2019 ◽  
Vol 5 ◽  
pp. 38-56 ◽  
Author(s):  
Khulod A. Hemida ◽  
Amany M.M. Reyad
Keyword(s):  
Salt Tolerance ◽  
Plant Growth ◽  
Endophytic Bacteria ◽  
Bacterial Species ◽  
Limiting Factors ◽  
Symbiotic Association ◽  
Bacterial Strains ◽  
Growth Promoters ◽  
Wide Range ◽  
Plant Salt Tolerance

Salinity is one of the most dangerous environmental limiting factors of the plant productivity. A wide range of adaptation strategies is required to overcome salinity stress. However, such strategies seem to be long drawn and cost-intensive. It has been confirmed in recent years that plant growth promoting endophytes (PGPEs) that have the ability to further build a symbiotic association with their host to improve host plant salt tolerance. In our investigation try to improve plant salt tolerance using different species of endophytic bacteria. From the total eight endophytic bacterial species were isolated from root, stem, and leaf of Carthamustinctorius (safflower) plant, two isolates were capable of using 1-aminocyclopropane-1-carboxylic acid (ACC) as a sole nitrogen source, and they are of positive results for (ACC) deaminase activity and indole-3-acetic acid (IAA) production. The bacterial isolates were identified using 16S ribosomal DNA technique as Bacillus cereus and Bacillus aerius and had accession numbers MG708176 and MG711593 respectively, by submitting their sequences in GenBank database. This study showed that the bacterial strains B. cereus and B. aerius are valuable biological plant growth promoters that could enhance salt tolerance in Safflower plants under 100, 200, and 300mMNaCl levels resulting in an increase in plant growth and ascorbate-glutathione redox cycle, in comparison with the non-inoculated controls. Our findings reported that the co-inoculation of the two selected endophytic bacteria strains were successfully isolated from Safflower seedlings significantly alleviated the harmful effects of salt stress, promoted plant growth and biomass yield.

scholarly journals Growth-Promoting Potential of Rhizobacteria Isolated From Sugarcane

2021 ◽  
Vol 5 ◽  
Author(s):  
Roberta Mendes dos Santos ◽  
Everlon Cid Rigobelo
Keyword(s):  
Plant Growth ◽  
Dry Matter ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Ribosomal Gene ◽  
Agricultural Crop ◽  
Cellulolytic Activity ◽  
Bacterial Strains ◽  
Crop Species ◽  
Growth Promoting

The search for plant growth-promoting rhizobacteria (PGPRs) addresses the ongoing need for new bioinoculants to be used on various agricultural crop species, including sugarcane. Bacterial strains were isolated from the rhizosphere of sugarcane plants and identified by sequencing the 16S ribosomal gene. The main indole acetic acid producers were Enterobacter sp. IP11, Enterobacter sp. IP14, and E. asburiae IP24. Achromobacter spanius IP23 presented the highest levels of cellulolytic activity and potassium solubilization. Bacillus thuringiensis IP21 and Staphylococcus saprophyticus IJ8 showed the highest levels of fixed nitrogen. The levels of calcium phosphate and aluminum phosphate in B. thuringiensis IP21 were notable, as this strain solubilized 481.00 and 39.33 mg of phosphorus mL−1, respectively; however, for Araxá apatite, the results for B. anthracis IP17 were notable (622.99 mg phosphorus mL−1), while for iron phosphate solubilization, Enterobacter sp. IP14, which solubilized 105.66 mg phosphorus mL−1 was notable. The B. thuringiensis IP21 and Enterobacter sp. IP11 isolates promoted the growth of the tallest sugarcane plants, inducing increases of 14.1 and 10.4% relative to the control plants, respectively. For shoot dry matter, root dry matter, and total dry matter, plants inoculated with Enterobacter sp. IP14, B. anthracis IP17, and A. spanius IP23 presented higher values than the controls. Furthermore, plants inoculated with B. thuringiensis IP21 presented higher root dry matter and total dry matter values, and those inoculated with Enterobacter sp. IP14 also presented higher total dry matter values. These results indicate that bacteria with the potential for use as future inoculants should be investigated since bacteria with plant growth-related characteristics may not impact growth promotion.

Isolation and identification of Rhizoctonia solani antagonist bacteria from the rhizosphere of pepper plants

2020 ◽  
Author(s):  
V.Zh. Nguyen ◽  
◽  
T.O. Dao ◽  
E. A. Kalashnikova ◽  
Th.H. Nguyen
Keyword(s):  
Rhizoctonia Solani ◽  
Inhibitory Activity ◽  
Soil Samples ◽  
Bacterial Strains ◽  
Isolation And Identification ◽  
Phosphate Solubilizing ◽  
Solubilizing Activity ◽  
Pepper Plants

The purpose of this work is to isolate bacteria from the pepper rhizosphere that inhibit Rhizoctoniasolani and evaluate in vitro their phosphate solubilizing activity and production of siderophore. Of the different soil samples taken from the pepper fields of An Thanh, An Ninh, Quynh My, QuynhPhudistrict, ThaiBinh province, 48 bacterial strains were isolated. Of these, 5 strains (AT16, VK 4.7, VK 4.8, VK 4.12, VK 4.13) expressed as higher inhibitory Rhizoctonia solani activity were selected. Their inhibitory activity is from 11.11% to 62.22%.

scholarly journals ХАРАКТЕРИСТИКА  БАКТЕРИЙ-АНТАГОНИСТОВ RHIZOCTONIA SOLANI, ВЫДЕЛЕННЫХ ИЗ РИЗОСФЕРЫ РАСТЕНИЙ ПЕРЦА

2019 ◽  
pp. 28-35
Author(s):  
V.Z. Nguyen ◽  
T.O. Dao ◽  
T.H. Nguyen ◽  
E.A. Kalashnikova
Keyword(s):  
Plant Growth ◽  
Rhizoctonia Solani ◽  
Capsicum Annuum ◽  
Plant Diseases ◽  
Bacterial Strains ◽  
Capsicum Annuum L ◽  
Wide Range ◽  
Stimulate Plant Growth ◽  
Phosphate Solubilizing

Перец овощной (Capsicum annuum L.) является одной из основных возделываемых культур Вьетнама в связи с широким его использованием в пищевой промышленности в качестве приправы. Это делает данное растение важной сельскохозяйственной культурой, которая приносит значительный доход вьетнамским фермерам. Однако на плантациях перца часто наблюдается появление и развитие болезни ризоктониоз, которую вызывает патогенный гриб Rhizoctonia solani, а также наблюдается бактериальное увядание, вызываемое бактерией Ralstonia solanacearum. Поражение ризоктониозом, одной из самых вредных болезней перца, может наблюдаться в любой фазе развития растений. Известно, что ризобактерии способны не только стимулировать рост растений, но и подавлять развитие болезней. Цель данной работы выделение из ризосферы растений перцев бактерий, ингибирующих развитие Rhizoctonia solani и оценка in vitro их фосфатрастворяющей активности и секреции сидерофора. Из различных почвенных образцов, отобранных с полей коммун Ан Хань, Ан Нинь, Кунь Ми, района Кунь Фу, провинции Тхай Бинь, выделено 48 штаммов бактерий, из которых были отобраны 5 штаммов (АТ 16 VK 4.7 VK 4.8 VK 4.12 VK 4.13), обладающих высокой ингибирующей активностью по отношению к Rhizoctonia solani, которая составила 11,11 62,22. Показано, что эти штаммы обладают способностью синтезировать такой фитогормон, как индолилуксусную кислоту (ИУК) (с 9,54 мг/мл до 31,06 мг/мл), растворять труднорастворимые фосфатные соединения и секрецировать сидерофор. Из 5 выделенных штаммов только у штамма АТ 16 данные способности выражены более сильно. Полученные результаты свидетельствуют о том, что изученные штаммы обладают хорошим потенциалом для использования их в качестве биологических агентов, контролирующих развитие R. solani на растениях перца.Peppers or chilli (Capsicum annuum L.) is widely grown in Vietnam because they bring considerable income to farmers. On pepper fields, diseases such as rhizoctonia, Rhizoctoniasolani caused by fungus, bacterial wilt by Ralstoniasolanacearum are often observed. Rhizoctoniasolani causes a wide range of significant diseases such as collar rot, root rot, damping offin horticultural and field crops.The diseases caused by rhizoctonia are one of the most harmful diseases on peppers, can be observed in any phase of plant development. Rhizobacteria that stimulate plant growth can be used to improve plant growth and suppress plant diseases. The purpose of this work is to isolate bacteria from the pepper rhizosphere that inhibit Rhizoctoniasolani and evaluate in vitro their phosphate solubilizing activity and production of siderophore. Of the different soil samples taken from the pepper fields of An Thanh, An Ninh, Quynh My, QuynhPhudistrict, ThaiBinh province, 48 bacterial strains were isolated. Of these, 5 strains (AT16, VK 4.7, VK 4.8, VK 4.12, VK 4.13) expressed as higher inhibitory Rhizoctoniasolani activity were selected. Their inhibitory activity is from 11.11 to 62.22. These strains have the ability to synthesize phytohormone IAA (from 9.54 g / ml to 31.06g / ml), solubilize the phosphate compounds and productsiderophore. Strain AT16 more effective expresses these abilities in comparison with 4 other strains. These results suggest that the selected strains have excellent potential for use as biologically controlled agents of R. solani on pepper plants (Capsicum annuum L.).

scholarly journals Potassium solubilization in phonolite rock by diazotrophic bacteria

2017 ◽  
Vol 8 (1) ◽  
pp. 17 ◽  
Author(s):  
Ligiane Aparecida Florentino ◽  
Adauton Vilela Rezende ◽  
Cássia Cristina Bachião Miranda ◽  
Aline Carvalho Mesquita ◽  
José Ricardo Mantovani ◽  
...  
Keyword(s):  
Plant Growth ◽  
Ph Value ◽  
Carbon Sources ◽  
Control Treatment ◽  
Nitrogen Fixing ◽  
Diazotrophic Bacteria ◽  
Bacterial Strains ◽  
Nitrogen Fixing Bacteria ◽  
Rock Powder ◽  
Potential Use

Some strains of nitrogen fixing bacteria, besides fixing the N2, can produce phytohormones, control pathogens, act in solubilization of minerals containing phosphorus (P) and potassium (K), contributing to plant growth. However, the solubilization of minerals containing K has been little exploited. Therefore, the aim of this study was to evaluate potassium solubilization (K) of phonolite rock by strains of associative nitrogen fixing bacteria supplied with two different carbon sources. Twelve bacterial strains were cultured for seven days at 25°C in Aleksandrov medium supplemented with phonolite rock powder. The experiment was carried out in a completely randomized factorial design, 13 x 2 (12 bacterial strains and a control without inoculation) and two carbon sources (glucose and sucrose) with four repetitions. After the growth, the supernatant was separated by centrifugation and analyzed for the final pH value and the content of K. All diazotrophic bacteria strains contributed to increase the release of K when compared to the control treatment. The strain UNIFENAS 100-94 solubilized 130 mg L-1 K in the presence of the two carbon sources, indicating the potential use of these diazotrophic bacterial strains for K solubilization from minerals.

scholarly journals Isolation and Identification of Uranium Tolerant Phosphate-Solubilizing Bacillus spp. and Their Synergistic Strategies to U(VI) Immobilization

2021 ◽  
Vol 12 ◽  
Author(s):  
Juan Zhong ◽  
Xuewu Hu ◽  
Xingyu Liu ◽  
Xinglan Cui ◽  
Ying Lv ◽  
...  
Keyword(s):  
Extracellular Polymeric Substances ◽  
Rrna Genes ◽  
Phosphate Solubilizing Bacteria ◽  
Ftir Analysis ◽  
Bacterial Strains ◽  
Isolation And Identification ◽  
Interesting Phenomenon ◽  
Bacterial Surface ◽  
Bacillus Spp ◽  
Phosphate Solubilizing

The remediation of uranium (U) through phosphate-solubilizing bacteria (PSB) is an emerging technique as well as an interesting phenomenon for transforming mobile U into stable minerals in the environment. While studies are well needed for in-depth understanding of the mechanism of U(VI) immobilization by PSB. In this study, two PSB were isolated from a U-tailing repository site. These bacterial strains (ZJ-1 and ZJ-3) were identified as Bacillus spp. by the sequence analysis of 16S ribosomal RNA (rRNA) genes. Incubation of PSB in liquid medium showed that the isolate ZJ-3 could solubilize more than 230 mg L–1 P from glycerol-3-phosphate and simultaneously removed over 70% of 50 mg L–1 U(VI) within 1 h. During this process, the rapid appearance of yellow precipitates was observed. The microscopic and spectroscopic analysis demonstrated that the precipitates were associated with U-phosphate compound in the form of saleeite-like substances. Besides, scanning electron microscopy coupled with energy-dispersive X-ray (SEM-EDS) and Fourier transform infrared spectroscopy (FTIR) analysis of the precipitates confirmed that the extracellular polymeric substances (EPS) might also play a key role in U sequestration. Furthermore, SEM and FTIR analysis revealed that part of U(VI) was adsorbed on the bacterial surface through cellular phosphate, hydroxy, carboxyl, and amide groups. This study provides new insights into the synergistic strategies enhancing U immobilization rates by Bacillus spp. that uses glycerol-3-phosphate as the phosphorus source, the process of which contributes to harmful pollutant biodegradation.

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