scholarly journals Plant growth-promoting activity in bean plants of endophytic bacteria isolated from Echeveria laui

2021 ◽  
Vol 5 (2) ◽  
pp. 65
Author(s):  
Anderson Emmer ◽  
João Arthur Dos Santos Oliveira ◽  
Andressa Domingos Polli ◽  
Julio Cesar Polonio ◽  
Leonardo Hamamura Alves ◽  
...  
Keyword(s):  
Plant Growth ◽  
Endophytic Bacteria ◽  
Arid Environment ◽  
Bacterial Isolates ◽  
Phaseolus Vulgaris L ◽  
Bean Plants ◽  
Plant Growth Promoting ◽  
Plant Growth Promoting Activity ◽  
Growth Promoting

Echeveria laui (Crassulaceae) is commonly commercialized due to its drought-tolerance capacity and to its rosette-shaped aesthetics. Since endophytes associated with plants from a dry or arid environment have scarcely been analyzed as yet, current research comprises the isolation of leaf endophytic bacteria from E. laui (one five-year-old and one two-year-old plants) investigating plant growth-promoting endophytic bacteria which may solubilize phosphate, fix nitrogen, produce exopolysaccharides/IAA and antagonize phytopathogens. Isolation by the maceration methodology provided a colonization rate of 1.98 x109 CFU g-1 for the two-year-old plant and 1.14 x 1010 CFU g-1 for the five-year-old one. All 40 isolates evaluated showed in vitro plant growth-promoting agent’s abilities, with emphasis on EG04, ELG18, and ELP06.  The capacity of the three best bacterial isolates were evaluated under greenhouse conditions in common and black bean (Phaseolus vulgaris L.) plants. Based on the sequencing of the 16S rRNA region and phylogenetic analysis, the three endophytes were identified as Pantoea sp. (ELG04 and ELG18) and Erwinia sp. (ELP06). Under greenhouse conditions, statistically significant differences were found among the plants treated with the three endophytes when compared to control plants for fresh and dry shoot, root biomass and length.

scholarly journals In Vitro Plant Growth Promoting Activity of Phyllocladane Diterpenoids Isolated from Callicarpa macrophylla Vahl. in Shoot Cultures of Rauwolfia serpentina

2007 ◽  
Vol 2 (8) ◽  
pp. 1934578X0700200 ◽  
Author(s):  
Manoj K Goel ◽  
Arun K Kukreja ◽  
Anil K Singh ◽  
Suman Preet S Khanuja
Keyword(s):  
Plant Growth ◽  
Shoot Cultures ◽  
Rauwolfia Serpentina ◽  
Plant Growth Promoting Activities ◽  
Plant Growth Promoting ◽  
Plant Tissue Cultures ◽  
Plant Growth Promoting Activity ◽  
Growth Promoting ◽  
In Vitro Shoot Cultures

Phyllocladane diterpenoids, particularly calliterpenone (1) and calliterpenone monoacetate (2), isolated from leaves of Callicarpa macrophylla, produced significantly higher growth and multiplication of in vitro shoot cultures of Rauwolfia serpentina at 0.25 and 0.5 mg/L concentrations, respectively, compared to certain other plant growth regulators (0.1-5.0 mg/L) tested under in vitro conditions. This is the first report of the plant growth promoting activities of 1 and 2 in plant tissue cultures.

scholarly journals Evaluation of the plant-growth-promoting abilities of endophytic bacteria from the psammophyteAmmodendron bifolium

2018 ◽  
Vol 64 (4) ◽  
pp. 253-264 ◽  
Author(s):  
Yanlei Zhu ◽  
Xiaoping She
Keyword(s):  
Seed Germination ◽  
Plant Growth ◽  
Endophytic Bacteria ◽  
Growth Stages ◽  
Bacterial Isolates ◽  
Pellicle Formation ◽  
Radicle Growth ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Plant Growth Promoting Traits

The objective of this study was to assess the plant-growth-promoting abilities of 45 endophytic bacterial isolates from Ammodendron bifolium through physiological characteristics detection and endophytic bacteria–plant interaction. Each of these isolates exhibited 1 or more plant-growth-promoting traits, but only 11 isolates belonging to the genera Bacillus, Staphylococcus, and Kocuria were capable of promoting seed germination and radicle growth. These results together with the results of the correlation analysis revealed that the completion of seed germination may not be due to IAA production, phosphate solubilization, pellicle formation, and ACC deaminase, protease and lipase production by endophytic bacteria, but may be closely related to amylase and cellulase production. Further, endophytic bacterial isolates with plant-growth-promoting traits may also provide beneficial effects to host plants at different growth stages. Thus, these results are of value for understanding the ecological roles of endophytic bacteria in host plant habitats and can serve as a foundation for further studies of their potential in plant regeneration.

scholarly journals Isolation and characterization of plant growth-promoting endophytic bacteria of wild legumes growing on sandy soils of Binh Thuan province, Vietnam

2021 ◽  
Vol 10 (3) ◽  
pp. 246-254
Author(s):  
Dang Thi Ngoc Thanh ◽  
Pham Thi Thu Ly ◽  
Pham Thi Nga ◽  
Pham Van Ngot
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Endophytic Bacteria ◽  
Phosphate Solubilization ◽  
Sandy Soils ◽  
Legume Species ◽  
Bacterial Isolates ◽  
Isolation And Characterization ◽  
Plant Growth Promoting ◽  
Growth Promoting

The roots of two legume species (Tephrosia purpurea and Tephrosia villosa) that grew wild on dry sandy soils of Binh Thuan province were sources for isolating plant growth-promoting endophytic bacteria. Semi-solid LGI medium was used for the isolation of nitrogen-fixing bacteria from root extracts. All bacterial isolates isolates were evaluated for their ability to solubilize calcium orthophosphate on solid NBRIP medium and their ability to produce IAA in Burk's liquid medium supplemented with 100 mg/L tryptophan. The possibilities of nitrogen fixation, phosphate solubilization and IAA synthesis were all quantitative examined by colorimetric method. Twenty-two bacterial isolates of T. purpurea and 18 isolates of T. villosa were capable of nitrogen fixation in the range of 1.94 to 2.81 mg/L NH4+, whereas only 18 isolates of T. purpurea and 16 isolates of T. villosa showed phosphate solubilization in the range of 12.30 – 48.90 mg/L P2O5, and IAA production in the range of 0.38 – 12.72 mg/L. Sixteen outstanding bacterial isolates of the two legume species were identified by MALDI-TOF technique. The results showed that 13 isolates had high similarity with five bacterial genera including Klebsiella, Cronobacter, Enterobacter, Burkholderia, and Bacillus with score values in the range of 2.070 – 2.411.

scholarly journals Evaluation of diverse range microbes for their plant growth promoting abilities and their pesticide compatibility

2021 ◽  
pp. 47-58
Author(s):  
Tulja Sanam ◽  
S. Triveni ◽  
J. Satyanaryana ◽  
Sridhar Goud Nerella ◽  
K. Damodara Chari ◽  
...  
Keyword(s):  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Atomic Absorption Spectrophotometry ◽  
In Vitro Assays ◽  
Bacterial Isolates ◽  
Diverse Range ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Bacillus Isolate

Plant growth-promoting rhizobacteria (PGPR) contribute to an increase in crop yield through an environmentally friendly method, therefore eight rhizospheric bacteria, two of each genera Bacillus, Pseudomonas, Azotobacter and Azospirillum were examined for their efficacy to solubilize mineral nutrients using atomic absorption spectrophotometry and a flame photometer. Their potency to produce phytohormones, synthesis biocontrol components and their compatibility with pesticides using in vitro assays was studied. All of the chosen bacterial isolates proved positive for the above-mentioned Plant Growth Promoting traits. Among the eight bacterial isolates Pseudomonas isolate P69 showed the highest phosphorous solubilization efficiency of 190.91 % and another isolate P48 produced a maximum of 27.63µg mL-1 of gibberellic acid, Bacillus isolate B120 could solubilize maximum amount of ZnO and ZnCO3 accounting for 21.3ppm and 25.9ppm, respectively, not merely in terms of solubilization when compared to the other isolates, B120 produced the highest levels of HCN (77.33 ppm TCC) and siderophores (48.87psu). On day 9 after inoculation, Azotobacter isolate AZB17 performed effectively in potassium solubilization of 6.25g mL-1 with a pH drop to 3.83. The Azospirillum isolate ASP25 outperformed all other isolates in terms of IAA production (22.64g mL-1) and Bacillus isolate B365 was found to be more compatible with eight different pesticides used in the field at varying concentrations. All of these factors point to the possibility of using these bacterial isolates B120, P48, P69, AZB17, and ASP25 as biofertilizers in sustainable agriculture.

scholarly journals Potensi Bakteri Endofit dari Tanaman Sagu (Metroxylon spp.) sebagai Agens Pemacu Pertumbuhan Tanaman Padi

2018 ◽  
Vol 14 (2) ◽  
pp. 75-80
Author(s):  
Yatni Yatni ◽  
Gratiana N C Tuhumury ◽  
Christoffol Leiwakabessy
Keyword(s):  
Plant Growth ◽  
Endophytic Bacteria ◽  
Growth Promoter ◽  
Plant Growth Promoting Bacteria ◽  
Test Results ◽  
Bacterial Isolates ◽  
The People ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Stems And Leaves

Sago is a staple plant of the people of Maluku and Papua, which have many benefits and advantages to continue to be developed. Endophytic bacteria are bacteria that live in plant tissues and colonize the intercellular and vascular systems. This study aims to obtain endophytic bacterial isolates from parts of the roots, stems, and leaves of sago plants which have the potential as agents for plant growth promoting bacteria. Endophytic bacteria are isolated from the roots, stems, and leaves. Based on the results of isolation, 21 isolates of endophytic bacteria were found. Then, the selection is done by hypersensitivity test and gram reaction test. The results of the selection obtained 20 isolates of endophytic bacteria that were not pathogenic. After that, it was followed by plant growth promoting test for endophytic bacterial isolates. The test results were obtained three isolates potentially as plant growth promoter that is STA1, STA6, and STA11. Keywords: endophytic bacteria, plant growth promoting, sago   ABSTRAK Tanaman sagu merupakan tanaman pokok masyarakat Maluku dan Papua, yang memiliki banyak manfaat dan keunggulan untuk terus dikembangkan. Bakteri endofit adalah bakteri yang hidup di dalam jaringan tanaman dan berkoloni pada daerah ruang interseluler dan sistem vascular. Penelitian ini bertujuan untuk mendapatkan isolat bakteri endofit dari bagian akar,batang dan daun tanaman sagu yang berpotensi sebagai agens pemacu pertumbuhan tanaman. Bakteri endofit diisolasi dari bagian akar, batang, dan daun. Berdasarkan hasil isolasi yang telah dilakukan didapati 21 isolat bakteri endofit. Kemudian seleksi dilakukan dengan uji hipersensitif dan uji reaksi gram. Hasil seleksi diperoleh 20 isolat bakteri endofit yang bukan patogen. Setelah itu dilanjutkan dengan uji pemacu pertumbuhan tanaman terhadap isolat bakteri endofit. Hasil pengujian tersebut diperoleh tiga isolat bakteri yang berpotensi sebagai pemacu pertumbuhan tanaman yaitu STA1, STA6, dan STA11. Kata kunci: bakteri endofit, pemacu pertumbuhan tanaman, sagu

scholarly journals In vitro antagonistic potential, plant growth-promoting activity and indole-3-acetic acid producing trait of bacterial isolates from spent mushroom substrate of Agaricus bisporus

2020 ◽  
Vol 25 (2) ◽  
pp. 22
Author(s):  
Rethinasamy Velazhahan ◽  
Shima Nasser Hamed Al-Mamari ◽  
Abdullah Mohammed Al-Sadi ◽  
Issa Hashil Al-Mahmooli ◽  
S. P. Sathish Babu
Keyword(s):  
Plant Growth ◽  
Agaricus Bisporus ◽  
Growth Promotion ◽  
Inhibition Zone ◽  
Bacterial Isolates ◽  
Plant Growth Promoting ◽  
Antagonistic Potential ◽  
Growth Promoting ◽  
Indole 3 Acetic Acid

Spent mushroom substrate (SMS) is widely used as fertilizer and to control plant diseases. The microorganisms surviving in SMS play a crucial role in plant growth promotion and biocontrol properties of SMS. In this study, an effort was made to isolate and characterize the bacterial species present in the SMS of Agaricus bisporus and to study their antagonistic potential, plant growth-promoting ability and indole-3-acetic acid (IAA) producing trait. Six different bacterial isolates exhibiting morphological variabilities were obtained from the SMS by serial dilution technique. On the basis of 16S rRNA gene sequences, these isolates were identified as Staphylococcus epidermidis (Sh1 and Sh3), S. aureus (Sh2), Bacillus albus (Sh4), Delftia lacustris (Sh6) and Comamonas aquatica (Sh7). These bacterial strains were assayed for their antagonism against Pythium aphanidermatum, a phytopathogenic oomycete. The results of in vitro dual culture assay revealed that all the 6 bacterial isolates showed low levels of suppression of P. aphanidermatum and recorded less than 5 mm inhibition zone. Among the bacterial isolates, S. epidermidis Sh3 recorded the maximum inhibition zone of 4.2 mm. Plant growth promotion test using roll paper towel method revealed that C. aquatica Sh7, B. albus Sh4, D. lacustris Sh6 and S. epidermidis Sh3 caused a significant increase in seedling vigour of cucumber compared to control. The seeds treated with the bacterial isolate C. aquatica Sh7 showed the maximum seedling vigor. Assessment of in vitro production of IAA by the bacterial isolates revealed that the bacterial isolates highly varied (ranging from 0.28 to 9.25 mg L-1) in their potential for production of IAA. The maximum amount of IAA was produced by C. aquatica Sh7 (9.25 mg L-1), while the minimum was produced by S. epidermidis Sh1 (0.28 mg L-1).

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