scholarly journals Do plant-growth promoting bacteria contribute to greater persistence of tropical pastures in water deficit? - A review

2020 ◽  
Vol 9 (8) ◽  
Author(s):  
Divaney Mamédio ◽  
Ulysses Cecato ◽  
Renan Sanches ◽  
Sillas Mayron da Silva da Silva ◽  
Diogo Rodrigues da Silva ◽  
...  
Keyword(s):  
Plant Growth ◽  
Water Deficit ◽  
Negative Impact ◽  
Innovative Technology ◽  
Plant Growth Promoting Bacteria ◽  
Forage Production ◽  
Tropical Pastures ◽  
Positive Effects ◽  
Plant Growth Promoting ◽  
Growth Promoting

The use of plant-growth promoting bacteria (PGPB) in pastures is a sustainable alternative to increment forage production. Besides, it is an innovative technology that can mitigate the effects of water deficit (WD) in pastures. Currently, WD is one of the main abiotic stressor agents responsible for a negative impact on agricultural production. Permanent or temporary WD imposes limitations on the growth and development of forage plants more than any other environmental factors. Although there have been studies for many years to improve resistance to WD and efficiency in water usage, the mechanism involved in the process is still not clear. A better understanding of the relations between plant and water and the mechanisms of tolerance to WD can significantly improve pastures productivity and environmental quality. Despite the mechanisms that allow plants to adjust as a response to WD, depending on its severity and duration plants are not capable to survive the stress by themselves. For that reason, the use of technologies such as PGPB can make them more resistant to WD without jeopardizing their development and productivity. There are studies that show the positive effects of PGPB in grasses during WD. In this review, we are going to present an overview of the causes, effects and responses of the inoculation of PGPB in grasses exposed to water deficit.

scholarly journals The Effects of Plant Growth-Promoting Bacteria with Biostimulant Features on the Growth of a Local Onion Cultivar and a Commercial Zucchini Variety

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 888
Author(s):  
Giorgia Novello ◽  
Patrizia Cesaro ◽  
Elisa Bona ◽  
Nadia Massa ◽  
Fabio Gosetti ◽  
...  
Keyword(s):  
Plant Growth ◽  
Growth Promotion ◽  
Global Market ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Strains ◽  
Mineral Concentration ◽  
Positive Effects ◽  
Plant Growth Promoting ◽  
Onion Cultivar ◽  
Growth Promoting

The reduction of chemical inputs due to fertilizer and pesticide applications is a target shared both by farmers and consumers in order to minimize the side effects for human and environmental health. Among the possible strategies, the use of biostimulants has become increasingly important as demonstrated by the fast growth of their global market and by the increased rate of registration of new products. In this work, we assessed the effects of five bacterial strains (Pseudomonas fluorescens Pf4, P. putida S1Pf1, P. protegens Pf7, P. migulae 8R6, and Pseudomonas sp. 5Vm1K), which were chosen according to their previously reported plant growth promotion traits and their positive effects on fruit/seed nutrient contents, on a local onion cultivar and on zucchini. The possible variations induced by the inoculation with the bacterial strains on the onion nutritional components were also evaluated. Inoculation resulted in significant growth stimulation and improvement of the mineral concentration of the onion bulb, induced particularly by 5Vm1K and S1Pf1, and in different effects on the flowering of the zucchini plants according to the bacterial strain. The present study provides new information regarding the activity of the five plant growth-promoting bacteria (PGPB) strains on onion and zucchini, two plant species rarely considered by the scientific literature despite their economic relevance.

scholarly journals Response of jiggs grass to inoculation with plant growth-promoting microrganisms

2021 ◽  
pp. 395-402
Author(s):  
Sonia Purin da Cruz ◽  
Kelen Cristina Basso
Keyword(s):  
Plant Growth ◽  
Cynodon Dactylon ◽  
Perennial Grass ◽  
Plant Morphology ◽  
Forage Production ◽  
Positive Effects ◽  
Plant Growth Promoting ◽  
Guinea Grass ◽  
Growth Promoting ◽  
Second World

Brazil is the second world producer of bovine meat, which often relies on preserved forage to decrease seasonality of forage production. Increased forage accumulation may be favored by technologies such as inoculation. Research works on this theme have been conducted with Azospirillum brasilense associated to oats, ryegrass and guinea grass. However, response of jiggs, a widely cultivated perennial grass, to plant growth-promoting microrganisms is poorly understood. Hence this study aimed to assess effects of inoculation on development of Cynodon dactylon cv. Jiggs. Four treatments were tested: T1) control, T2) Inoculation with A. brasilense, T3) Inoculation with Azospirillum, Rhizobium, Pseudomonas and Saccharomyces, T4) Inoculation + Reinoculation with Azospirillum, Rhizobium, Pseudomonas and Saccharomyces. Forage mass, percentage of leaves, stems, dead mass, reproductive structures and leaf/stem ratio were measured. Data were submitted to analysis of variance, and when significant effects were detected, means were separated by LSD Test. Positive effects of inoculation were recorded at all evaluations, mostly concerning percentage of leaves and leaf/stem ratio. A. brasilense improved leaf/stem ratio up to 56%. Also, a 64% increment on this parameter was obtained with Azospirillum, Rhizobium, Pseudomonas and Saccharomyces. Modifications of plant morphology components are important since grasses with more percentage of leaves increase nutritional value of haylage. Morphology of Cynodon dactylon cv. Jiggs is affected by Azospirillum, Rhizobium, Saccharomyces and Pseudomonas, improving aspects related to palatability and preferred grazing of livestock animals.

scholarly journals The use of bacterial indol-3-acetic acid (IAA) for reduce of chemical fertilizers doses

2017 ◽  
Vol 71 (3) ◽  
pp. 195-200 ◽  
Author(s):  
Snezana Djordjevic ◽  
Dragana Stanojevic ◽  
Milka Vidovic ◽  
Violeta Mandic ◽  
Ivana Trajkovic
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Pcr Amplification ◽  
Rrna Gene ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Strains ◽  
Chemical Fertilizers ◽  
Positive Effects ◽  
Plant Growth Promoting ◽  
Growth Promoting

The standard technology of seed processing uses mainly chemical products. Recent researches showed that toxic materials from chemical fertilizers can be harmful to humans, animals and the environment. Currently the attention of researches is shifting away from chemical fertlizers and toward alternative that consumers perceive to be natural, Plant Growth Promoting bacteria (PGP). PGP bacteria could be a way to reduce chemical fertilizer doses. This was the reason to test the ability of Bacillus megaterium, Azotobacter chroococcum to produce hormone auxin (IAA). Bacterial strains were identified by PCR amplification and sequencing of the 16S rRNA gene. Indole-3-acetic acid (IAA) was detected and quantified by MRM experiment. This study conducted that maize seed inoculation with IAA from species mentioned above showed positive effects. They had statistically significantly higher root and steam height compared to control seedlings. Bacterial strains tested in this study may be recommended as PGP (Plant Growth Promoting) bacteria, due to their positive effects and eventually can be used to reduce chemical fertilizers doses.

scholarly journals Comparative Effects of Individual and Consortia Plant Growth Promoting Bacteria on Physiological and Enzymatic Mechanisms to Confer Drought Tolerance in Maize (Zea mays L.)

2021 ◽  
Author(s):  
Muhammad Saleem ◽  
Fahim Nawaz ◽  
Muhammad Baqir Hussain ◽  
Rao Muhammad Ikram
Keyword(s):  
Drought Tolerance ◽  
Plant Growth ◽  
Water Deficit ◽  
Pot Experiment ◽  
Antioxidant Systems ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Strains ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Individual

AbstractMitigation strategies based on plant–microbe interactions to increase the performance of plants under water-deficit conditions are well documented. However, little is known about a suitable consortium of bacterial inoculants and underlying physiological and enzymatic events to improve drought tolerance in maize. We performed laboratory and pot experiments to understand the synergistic interactions among plant growth-promoting bacteria to alleviate the drought-induced damages in maize. Initially, ten bacterial strains were evaluated for their osmotic stress tolerance capacity by growing them in a media containing 0, 10, 20, and 30% polyethylene glycol (PEG-6000). Also, the seeds of a drought tolerant (NK-6654) and sensitive (SD-626) maize cultivar were inoculated with these bacterial strains in the first pot experiment to determine their effects on the growth and physiological processes. Later, in the second pot experiment, the best performing inoculants were selected to study the individual and synergistic effects of bacterial inoculation to confer drought tolerance in maize. Our findings showed that the inoculation with tolerant strains resulted in higher photosynthetic activity (25–39%), maintenance of leaf water status (14–18%) and pigments (27–32%), and stimulation of antioxidant machinery (28–38%) than no inoculation in water-stressed maize seedlings. Moreover, the treatment with bacteria consortia further stimulated the drought protective mechanisms and resulted in higher efficiency of photosynthetic (47–61%) and antioxidant systems (42–62%) than the individual inoculants under water-deficit conditions. We conclude that the inoculation with microbial consortia regulates water uptake, photosynthetic performance, and stress metabolites to minimize drought-induced damages in maize.

Isolation and identification of plant growth-promoting bacteria associated with tall fescue

2009 ◽  
pp. 211-216 ◽  
Author(s):  
J. Monk ◽  
E. Gerard ◽  
S. Young ◽  
K. Widdup ◽  
M. O'Callaghan
Keyword(s):  
New Zealand ◽  
Plant Growth ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Plant Growth Promoting Bacteria ◽  
Beneficial Bacteria ◽  
Isolation And Identification ◽  
Naturally Occurring ◽  
Plant Growth Promoting ◽  
Growth Promoting

Tall fescue (Festuca arundinacea) is a useful alternative to ryegrass in New Zealand pasture but it is slow to establish. Naturally occurring beneficial bacteria in the rhizosphere can improve plant growth and health through a variety of direct and indirect mechanisms. Keywords: rhizosphere, endorhiza, auxin, siderophore, P-solubilisation

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