scholarly journals Mecanismos de acción de las rizobacterias promotoras del crecimiento vegetal.

2011 ◽  
Vol 12 (2) ◽  
pp. 159 ◽  
Author(s):  
Mauricio Camelo R. ◽  
Sulma Paola Vera M. ◽  
Ruth Rebeca Bonilla B.
Keyword(s):  
Plant Growth ◽  
High Efficiency ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting Bacteria ◽  
Toxic Substances ◽  
Pests And Diseases ◽  
Modern Agriculture ◽  
Plant Growth Promoting ◽  
Production Cycles ◽  
Growth Promoting

<p>La dinámica poblacional de la especie humana ha llevado a que la explotación de los recursos naturales, en búsqueda de suplir las necesidades alimenticias de los miles de millones de personas que habitan el planeta. Esta necesidad ha llevado a la utilización de materiales de alta eficiencia en la agricultura, variedades vegetales resistentes a plagas y enfermedades con ciclos de producción más cortos, agroquímicos que surten las necesidades nutricionales y provean protección frente factores bióticos adversos (plagas y enfermedades). Sin embargo, estas estrategias utilizadas en la agricultura moderna han generado impactos ambientales negativos que aún no comprendemos. La contaminación de aguas freáticas, eutrofización, aumento de gases de invernadero y acumulación de sustancias toxicas en la cadena trófica, son algunos de los graves problemas que se presentan por el uso indiscriminado de agroquímicos. Como alternativa a la utilización de estas sustancias, se ha propuesto el uso de bacterias rizosféricas que tienen reconocida acción sobre el crecimiento y desarrollo vegetal (PGPR, por sus siglas en ingles). Estas bacterias son capaces de estimular el desarrollo de las plantas de manera directa e indirecta y poseen una serie de mecanismos complejos que interactúan entre sí para establecer relaciones benéficas, especialmente con las raíces de las plantas objetivo. El estudio y entendimiento de las PGPR han sido temas de gran importancia en muchas investigaciones a nivel mundial, por esta razón esta revisión tiene por objetivo hacer una revisión parcial para dar a conocer los mecanismos que poseen las rizobacterias promotoras del crecimiento vegetal en el desarrollo de las plantas, así como el papel que desempeñan en el ciclaje de nutrientes.</p><p> </p><p><strong>Mechanisms of action of plant growth promoting rhizobacteria.</strong></p><p>The population dynamics of the human race has led to the exploitation of natural resources in search of a way to meet the nutritional needs of the billions of people inhabiting the planet. This need has led to the use of high-efficiency materials in agriculture, plant varieties with shorter production cycles that are also resistant to pests and diseases, and chemicals that provide protection against biotic factors (pests and disease), additionally the nutrients required to grow plants. However, the strategies used in modern agriculture have led to negative environmental impacts that we have yet to fully understand. Groundwater contamination, eutrophication, increased greenhouse gases, and the accumulation of toxic substances in the food chain are some of the serious problems that have arisen worldwide due to the indiscriminate use of agrochemicals. As an alternative to the use of these substances, the use of rhizopheric bacteria has been proposed owing to its known action as plant growth- promoting bacteria (PGPB). These bacteria are able to stimulate plant growth directly and indirectly and have several complex mechanisms that interact with each other to establish beneficial relationships, especially with the roots of target plants. The study and understanding of PGPR have been the subjects of great importance in many studies at a global level. This review, therefore, aims to better understand the mechanisms of plant growth-promoting rhizobacteria on plant development and their role in nutrient cycling.</p>

scholarly journals Comparative Effects of Bio-Wastes in Combination with Plant Growth-Promoting Bacteria on Growth and Productivity of Okra

Agronomy ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2065
Author(s):  
Hammad Anwar ◽  
Xiukang Wang ◽  
Azhar Hussain ◽  
Muhammad Rafay ◽  
Maqshoof Ahmad ◽  
...  
Keyword(s):  
Plant Growth ◽  
Soil Health ◽  
Organic Amendments ◽  
Plant Growth Promoting Rhizobacteria ◽  
Fruit Weight ◽  
Growth And Yield ◽  
Plant Growth Promoting Bacteria ◽  
Randomized Design ◽  
Plant Growth Promoting ◽  
Growth Promoting

Plant growth-promoting rhizobacteria with multiple growth-promoting traits play a significant role in soil to improve soil health, crop growth and yield. Recent research studies have focused on the integration of organic amendments with plant growth-promoting rhizobacteria (PGPR) to enhance soil fertility and reduce the hazardous effects of chemical fertilizers. This study aims to evaluate the integrated application of biochar, compost, fruit and vegetable waste, and Bacillus subtilis (SMBL 1) to soil in sole application and in combined form. The study comprises eight treatments—four treatments without inoculation and four treatments with SMBL 1 inoculation in a completely randomized design (CRD), under factorial settings with four replications. The results indicate that the integrated treatments significantly improved okra growth and yield compared with sole applications. The integration of SMBL 1 with biochar showed significant improvements in plant height, root length, leaf chlorophyll a and b, leaf relative water content, fruit weight, diameter and length by 29, 29, 50, 53.3, 4.3, 44.7 and 40.4%, respectively, compared with control. Similarly, fruit N, P and K contents were improved by 33, 52.7 and 25.6% and Fe and Zn in shoot were 37.1 and 35.6%, respectively, compared with control. The results of this study reveal that the integration of SMBL 1 with organic amendments is an effective approach to the sustainable production of okra.

scholarly journals Promotion of Nitrogen Assimilation by Plant Growth-Promoting Rhizobacteria

2021 ◽  
Author(s):  
Gabriel Monteiro ◽  
Glauco Nogueira ◽  
Cândido Neto ◽  
Vitor Nascimento ◽  
Joze Freitas
Keyword(s):  
Plant Growth ◽  
Sustainable Use ◽  
Plant Growth Promoting Rhizobacteria ◽  
Relevant Information ◽  
Mineral Fertilization ◽  
Modern Agriculture ◽  
Environmental Threat ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Many

Nitrogen fertilizers are one of the highest expenses in agricultural systems and usually a limitation to the productions of many agricultural crops worldwide. The intensive use of this element in modern agriculture represents a potential environmental threat, one of the many tools for the sustainable use of this resource without losing productivity is the use of plant growth-promoting rhizobacteria, especially nitrogen-fixing bacteria. However, in considering the competitiveness of the market, studies are still needed to determine the most efficient way to use this resource and if the nitrogen mineral fertilization is indeed substitutable. As a result, this study aims to deepen the scientific knowledge of the plant-microbe interactions by addressing their main characteristics and functionalities for plant growth and development and efficiency in the use of nitrogen. For this we reviewed relevant information from scientific works that address these issues.

scholarly journals PENGEMBANGAN PERTANIAN ORGANIK MELALUI BUDIDAYA TANAMAN PALAWIJA DENGAN APLIKASI TEKNOLOGI RIZOBAKTERI INDIGENOS DI NAGARI SUNGAI DURIAN KABUPATEN SOLOK

2017 ◽  
Vol 1 (2) ◽  
pp. 88
Author(s):  
Yulmira Yanti ◽  
Munzir Busniah ◽  
Trimurti Habazar ◽  
Zulfadli Syarief ◽  
Intan Sari Pasaribu
Keyword(s):  
Plant Growth ◽  
Disease Control ◽  
Community Service ◽  
Plant Growth Promoting Rhizobacteria ◽  
Growth And Yield ◽  
Service Program ◽  
Sweet Potatoes ◽  
Pests And Diseases ◽  
Plant Growth Promoting ◽  
Growth Promoting

ABSTRAK Nagari Sungai Durian Kabupaten Solok merupakan salah satu nagari yang memiliki berbagai permasalahan seperti kekeringan, tingginya jumlah lahan tidur dan jauhnya akses. Tanaman utama yang ditanam saat musim hujan adalah padi sawah, namun sebagian besar lahan menjadi lahan tidur saat musim kemarau. Solusi yang dapat ditawarkan adalah dengan penanaman tanaman palawija yang lebih tahan terhadap kekeringan dan penggunaan rizobakteri sebagai agens pengendali hama dan penyakit. Selain sebagai agens pengendali hama dan penyakit, penggunaan rizobakteri juga sebagai PGPR (Plant Growth Promoting Rhizobacteria) yang mampu meningkatkan pertumbuhan dan hasil tanaman. Tujuan dari program pengabdian masyarakat ini adalah memberikan pengetahuan kepada masyarakat dalam budidaya tanaman palawija dengan aplikasi teknologi rizobakteri indigenos. Kegiatan ini dilakukan dengan cara sosialisasi dan demonstrasi plot. Adapun luaran yang didapat dari program pengabdian masyarakat ini adalah :1) Masyarakat mendapatkan pengetahuan serta menguasai teknik budidaya tanaman palawija yang baik (jagung, singkong dan ubi jalar); 2) pengetahuan mengenai teknologi pemanfaatan rizobakteri sebagai agens hayati dalam pengendalian hama dan penyakit tanaman serta peningkatan pertumbuhan dan hasil tanaman palawija; 3) Mendapatkan produk pertanian organik (jagung, singkong dan ubi jalar) yang bebas dari penggunaan pupuk dan pestisida sintetik. Kata kunci : Agens hayati, Rizobakteri, PGPR, Tanaman palawija ABSTRACT Nagari Sungai Durian of Solok District is one of the village that has various problems such as drought, high number of unused land and the distance of urban access. The main crops in this village grown during the rainy season are wetland paddy, but most of the land becomes unused during the dry season. The solution that can be offered is by planting crops that are more resistant to drought and the use of rhizobacteria as pest and disease control agents. In addition to pest and disease control agents, the use of rhizobacteria which also called PGPR (Plant Growth Promoting Rhizobacteria) that can increase growth and yield of plants. The purpose of this community service program is to provide knowledge to the community in the cultivation of secondary crops with the application of indigenous rhizobacteria technology. This activity is done by socialization and demonstration plot. The outcomes obtained from this community service program are: 1) Communities gain knowledge and master good cultivation of secondary crops (corn, cassava and sweet potatoes); 2) knowledge of rhizobacteria utilization technology as biological agent in plant pests and diseases control and improvement of crops' growth and yield; 3) Obtain organic agricultural products (corn, cassava and sweet potato) that are free from the use of synthetic fertilizers and pesticides. Keywords: Biological agents, Rhizobacteria, PGPR, Secondary crops

scholarly journals Induction of Bacterial Canker Resistance in Tomato Plants Using Plant Growth Promoting Rhizobacteria

2019 ◽  
Vol 13 (1) ◽  
pp. 215-222 ◽  
Author(s):  
Yuliya Kolomiiets ◽  
Ivan Grygoryuk ◽  
Artur Likhanov ◽  
Lyudmila Butsenko ◽  
Yaroslav Blume
Keyword(s):  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Cell Suspensions ◽  
Systemic Resistance ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Canker ◽  
Tomato Plants ◽  
High Productivity ◽  
Plant Growth Promoting ◽  
Growth Promoting

Background: By inducing the production of inhibitory allelochemicals and mechanisms of systemic resistance plant growth promoting bacteria (PGPB) help plants to cope with stresses. Materials and Methods: In this study cell suspensions of Bacillus subtilis, Pseudomonas fluorescens or Azotobacter chroococcum were used to test the efficacy of these PGPB in inducing resistance in tomato (Lycopersicon esculentum Mill) against Clavibacter michiganensis subsp michiganensis, a bacteria known to cause canker disease. To test this hypothesis, seedlings of Chaika variety, characterized by short growing, early-ripening, high productivity and resistance against fusarium and the C. michiganensis strain ІZ-38 isolated in Kyiv were employed. Results and Conclusion: The use of cell suspensions of the PGPB B. subtilis, A. chroococcum or P. fluorescens induced an increment in the resistance of tomato plants against the causative agent of bacterial canker (C. michiganensis subsp. michiganensis) by 42–50%. PGPB in fact promoted in C. michiganensis infected tomato plants: i) the accumulation of chlorophyll a and b and carotenoids; ii) the thickening of the upper and lower epidermis of leaves; iii) the deposition of biopolymers with protective properties in epidermal cells; iv) the activity of the peroxidase enzyme and v) the net productivity of photosynthesis.

scholarly journals Characterization of Plant Growth Promoting Rhizobacteria (PGPR) on Capcissum annum

2021 ◽  
Vol 6 (2) ◽  
pp. 255-263
Author(s):  
Indah Juwita Sari ◽  
Indria Wahyuni ◽  
Rida Oktorida Khastini ◽  
Ewi Awaliyati ◽  
Andriana Susilowati ◽  
...  
Keyword(s):  
Plant Growth ◽  
Capsicum Annuum ◽  
Pathogenic Fungi ◽  
Culture Method ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting Bacteria ◽  
Dual Culture ◽  
Plant Growth Promoting ◽  
Growth Promoting

Plant Growth Promoting Bacteria Rhizobacteria (PGPR) is one of the potential bacteria to enhance of Capsicum annuum through inhabitation the growth of pathogenic fungi. This study aimed to characterize PGPR in chili plants (Capsicum annuum). PGPR was isolated from the soil habitat of the red chili plant in Cilegon, Indonesia. Screening was then carried out with the dual culture method on Petri dishes and tested through in vivo method on the red chili plant. The selected bacteria were characterized morphologically, biochemically, and physiologically. The results revealed that there were 14 single isolates of bacteria from the roots of the red chili plants. The five single bacterial isolates, namely Azostobacter, Azospirillum, Pseudomonas, Serratia, and Beijerinckia have good potential as PGPR based on multiple culture screening by producing clear zones and positively effect the growth of chili plants.

scholarly journals Evaluation of potential contribution of plant growth-promoting bacteria to land desertification

2020 ◽  
Vol 165 ◽  
pp. 02013
Author(s):  
Min He
Keyword(s):  
Plant Growth ◽  
High Efficiency ◽  
Low Cost ◽  
Potential Contribution ◽  
Plant Growth Promoting Bacteria ◽  
Degraded Soil ◽  
Plant Growth Promoting ◽  
Plant Restoration ◽  
Growth Promoting ◽  
Increase Crop Yield

The problem of soil degradation is becoming more and more serious, how to effectively repair desertified degraded soil has aroused widespread concern. As one of the emerging strategies, plant restoration has great advantages such as high efficiency and low cost, but this technology also has some defects, that is, it is difficult for plants to be established in the coercive environment of ecological destruction. Modified plant growth-promoting bacteria (PGPB) is usually used to increase crop yield. In addition to their proven uses in agriculture, they also have potential in solving environmental problems. This paper analyzes the limitations of solving the problem of environmental degradation based on phytoremediation, and enumerates and explains two methods for screening PGPB. By enumerating the application status of PGPB in promoting the growth of native plants to prevent soil erosion in degraded areas, the importance of plant growth-promoting bacteria to soil quality and microbial structure before plant remediation was discussed. The purpose of this paper is to provide thoughts and suggestions for the study of phytoremediation by combined plant growth-promoting bacteria and plants in desertified degraded soil environment.

scholarly journals Alleviation of Salt Stress on Wheat (Triticum aestivum L.) by Plant Growth Promoting Bacteria strains Bacillus halotolerans MSR-H4 and Lelliottia amnigena MSR-M49

2020 ◽  
pp. 44-58
Author(s):  
Ibrahim El-Akhdar ◽  
Tamer Elsakhawy ◽  
Hanaa A. Abo-Koura
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Crop Production ◽  
Halophilic Bacteria ◽  
Wheat Plant ◽  
Dry Weight ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting

The plant growth-promoting rhizobacteria (PGPR) application could reduce the use of synthetic fertilizers and increase the sustainability of crop production. Halophilic bacteria that have PGPR characteristics can be used in different environmental stresses. Two different strains isolated, purified, characterized as a PGPRs and phylogenetic identification using 16sRNA which was revealed to be closest matched at 99% with Bacillus halotolerans and Lelliottia amnigena. The isolates possessed plant growth promoting properties as exopolysaccharides (EPS) and indole acetic acid (IAA) production, Bacillus halotolerans had the ability to fix elemental nitrogen and the two strains have the ability to P-solubilization. Furthermore, the strains were evaluated in alleviation of different levels of salt stress on wheat plant at two experiments (Pots and a Field). Strains under study conditions significantly increased the plant height, straw dry weight (DW g plant-1), spike number, 1000 grain DW recorded 31.550 g with Lelliottia amnigena MSR-M49 compared to un-inoculated and other strain in field,  grain yield recorded 2.77 (ton fed-1) with Lelliottia amnigena  as well as N% and protein content in grains recorded 1.213% and 6.916 respectively with  inoculation with Lelliottia amnigena,  also, spikes length, inoculated wheat show reduction in both proline accumulation in shoots and roots especially with Lelliottia amnigena recorded 2.79 (mg g-1DW), inoculation significantly increased K+ in root-shoot, K+/Na+ in root-shoot and reduced Na+ in root-shoot compared with control. This confirmed that this consortium could provide growers with a sustainable approach to reduce salt effect on wheat production.

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