scholarly journals Recent Advances in Understanding Mechanisms of Plant Tolerance and Response to Aluminum Toxicity

2021 ◽  
Vol 13 (4) ◽  
pp. 1782
Author(s):  
Yunmin Wei ◽  
Rongrong Han ◽  
Yonghong Xie ◽  
Caode Jiang ◽  
Yongxiong Yu
Keyword(s):  
Plant Growth ◽  
Aluminum Toxicity ◽  
Plant Growth Promoting Rhizobacteria ◽  
Al Toxicity ◽  
Plant Production ◽  
Plant Tolerance ◽  
Al Stress ◽  
Transgenic Breeding ◽  
Plant Growth Promoting ◽  
Growth Promoting

Aluminum (Al) toxicity is a major environmental stress that inhibits plant growth and development. There has been impressive progress in recent years that has greatly increased our understanding of the nature of Al toxicity and its mechanisms of tolerance. This review describes the transcription factors (TFs) and plant hormones involved in the adaptation to Al stress. In particular, it discusses strategies to confer plant resistance to Al stress, such as transgenic breeding, as well as small molecules and plant growth-promoting rhizobacteria (PGPRs) to alleviate Al toxicity. This paper provides a theoretical basis for the enhancement of plant production in acidic soils.

scholarly journals ROLE OF RHIZOBACTERIA IN PHYTOREMEDIATION OF HEAVY METALS

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
N Nadeem ◽  
R Asif ◽  
S Ayyub ◽  
S Salman ◽  
F Shafique ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Plant Growth ◽  
Soil Fertility ◽  
Plant Growth Promoting Rhizobacteria ◽  
Heavy Metal Accumulation ◽  
Plant Tolerance ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Nickel Lead

Rhizobacteria, a plant growth promoting rhizobacteria (PGPR) as beneficial microorganism which helps in defense from abiotic and abiotic stresses, colonizes in rhizosphere and played a major role in promoting plant growth and also provides enhance soil fertility. In the highly contaminated soil, the content of metal exceeds the limits of plant tolerance. It is also possible that treatment of plant with PGPR, here increasing the biomass of plant, stabilizing and the remediation of metal polluted soil. The use of rhizobacteria plays and important role in increasing the tolerance of plant towards toxic effects of heavy metals like arsenic, sulphur, mercury, chromium, cadmium, nickel, lead and copper etc. Heavy metal accumulation results in deterioration of soil fertility while PGPR helps to restore soil fertility. The process of phytoremediation has been proved to be the best way to remediate heavy metals from soil. The use of rhizobacteria with plants provides highly efficiency phytoremediation. However, there is still need to understanding the concept of microbial ecological study in rhizosphere and mechanism of detoxification of heavy metals form rhizosphere.

scholarly journals USE OF PLANT GROWTH PROMOTING RHIZOBACTERIA AGAINST SALT STRESS FOR TOMATO (SOLANUM LYCOPERSICUM L.) SEEDLING GROWTH

2020 ◽  
Vol 19 (6) ◽  
pp. 15-29
Author(s):  
Yagmur Yilmaz ◽  
Ceknas Erdinc ◽  
Ahmet Akkopru ◽  
Selma Kipcak
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Pseudomonas Putida ◽  
Photosynthetic Pigment ◽  
Plant Growth Promoting Rhizobacteria ◽  
Growth And Yield ◽  
Plant Tolerance ◽  
Membrane Injury ◽  
Plant Growth Promoting ◽  
Growth Promoting

Salt stress affects many aspects of plant metabolism and as a result, growth and yield are reduced. The aim in this study was to determine the effects of plant growth promoting rhizobacteria (PGPR) on tomato plants under salt stress. With this aim, the Interland F1 cv. and bacterial isolates of Bacillus thuringiensis CA41/1, Pseudomonas putida 18/1K, Pseudomonas putida S5/4ep, and Pseudomonas putida 30 were used. Salt application was completed in two different doses of 25 and 50 mM NaCl when seedlings reached the stage of 3 true leaves. At the end of the study, in addition to seedling development criteria, some nutrient element contents and rates (K, Ca, Na, K/Na and Ca/Na), superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) enzyme activities, malondialdehyde (MDA) and photosynthetic pigment contents were determined. In the stress environment, PGPR inoculation increased K content by up to 10%, while apart from isolate P. putida no.30, the other isolates lowered Na content by up to 18%. Additionally, 18/1K and S5/4ep isolates were identified to reduce membrane injury index by up to 97%. It was identified that CA41/1, 18/1K and S5/4ep isolates were more effective against salt stress, especially. In general, the plant tolerance levels induced by the bacteria were identified to increase with the increase in salt stress.

scholarly journals Plant Growth Promoting Rhizobacteria Alleviate Aluminum Toxicity and Ginger Bacterial Wilt in Acidic Continuous Cropping Soil

2020 ◽  
Vol 11 ◽  
Author(s):  
Shuting Zhang ◽  
Qipeng Jiang ◽  
Xiaojiao Liu ◽  
Liehua Liu ◽  
Wei Ding
Keyword(s):  
Bacterial Community ◽  
Plant Growth ◽  
Bacterial Wilt ◽  
Aluminum Toxicity ◽  
Bacterial Community Composition ◽  
Plant Growth Promoting Rhizobacteria ◽  
Continuous Cropping ◽  
Aluminum Ions ◽  
Plant Growth Promoting ◽  
Growth Promoting

Long-term monoculture cropping is usually accompanied by soil acidification and microbial community shifts. Soil aluminum ions are dissolved under acidic condition (pH < 5.0), and the resulting aluminum bioavailability can cause toxic effects in plants. In this study, we investigated the bacterial community compositions and aluminum toxicity in fields monocultured with ginger for 35 years, 15 years, and 1 year. Within these fields are ginger plants without and with ginger bacterial wilt disease. The results confirmed that the degree of aluminum toxicity in the diseased soil was more severe than that in the healthy soil. Continuous cropping can significantly increase the bacterial diversity and change the bacterial community composition of ginger rhizosphere soil. The relative abundance of plant growth-promoting rhizobacteria (PGPRs) was increased in the soils used for the continuous cropping of ginger. Additionally, aluminum toxicity had a significant positive correlation with Bacillus, Pseudomonas, Arthrobacter, and Serratia in healthy soils. Based on these results, aluminum stress may stimulate the increase of PGPRs (Bacillus, Pseudomonas, Arthrobacter, and Serratia), thereby alleviating ginger aluminum toxicity and bacterial wilt in extremely acidic soil (pH < 4.5).

scholarly journals Plant Growth-Promoting Rhizobacteria Isolated from Degraded Habitat Enhance Drought Tolerance of Acacia (Acacia abyssinica Hochst. ex Benth.) Seedlings

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Alemayehu Getahun ◽  
Diriba Muleta ◽  
Fassil Assefa ◽  
Solomon Kiros
Keyword(s):  
Drought Stress ◽  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
In Vitro Assays ◽  
Plant Tolerance ◽  
Bacterial Strains ◽  
Root And Shoot Length ◽  
Plant Growth Promoting ◽  
Growth Promoting

Drought stress (DS) is the most impacting global phenomenon affecting the ecological balance of a particular habitat. The search for potential plant growth-promoting rhizobacteria (PGPR) capable of enhancing plant tolerance to drought stress is needed. Thus, this study was initiated to evaluate the effect of inoculating Acacia abyssinica seedlings with PGPR isolated from rhizosphere soil of Ethiopia to enhance DS tolerance. The strains were selected based on in vitro assays associated with tolerance to drought and other beneficial traits such as salinity, acidity, temperature, heavy metal tolerances, biofilm formation, and exopolysaccharide (EPS) production. The strains with the best DS tolerance ability were selected for the greenhouse trials with acacia plants. The results indicate that out of 73 strains, 10 (14%) were completely tolerant to 40% polyethylene glycol. Moreover, 37% of the strains were strong biofilm producers, while 66 (90.41%) were EPS producers with a better production in the medium containing sucrose at 28 ± 2°C and pH 7 ± 0.2. Strains PS-16 and RS-79 showed tolerance to 11% NaCl. All the strains were able to grow in wider ranges of pH (4–10) and temperature (15–45°C) and had high tolerance to heavy metals. The inoculated bacterial strains significantly ( p ≤ 0.05 ) increased root and shoot length and dry biomass of acacia plants. One of the strains identified as P. fluorescens strain FB-49 was outstanding in enhancing DS tolerance compared to the single inoculants and comparable to consortia. Stress-tolerant PGPR could be used to enhance acacia DS tolerance after testing other phytobeneficial traits.

The use of plant growth-promoting rhizobacteria (PGPR) to improve root function and crop nutrient use efficiency

2021 ◽  
pp. 467-492
Author(s):  
Melissa M. Larrabee ◽  
◽  
Louise M. Nelson ◽  
Keyword(s):  
Plant Growth ◽  
Root Function ◽  
Nutrient Use Efficiency ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Tolerance ◽  
Beneficial Effects ◽  
Nutrient Use ◽  
Plant Growth Promoting ◽  
Use Efficiency ◽  
Growth Promoting

Bacteria that colonize plant roots and promote plant growth and development, plant growth-promoting rhizobacteria (PGPR) can contribute to more sustainable intensification of agriculture while minimizing detrimental impacts associated with excessive fertilization. In this chapter we review recent research on the use of PGPR as biofertilizers to enhance root function and improve nutrient uptake. PGPR alter root architecture, root metabolism, nutrient use efficiency and enhance plant tolerance to abiotic stresses such as salinity and drought by a variety of mechanisms that are not yet well understood. Beneficial effects observed in the laboratory are not always seen consistently in the field due to varying environment and complex biotic interactions, limiting the widespread application of PGPR in agriculture. We highlight new research approaches that will facilitate our understanding of this complex community at the molecular level and from a holistic perspective. Applied research to facilitate registration and commercialization of biofertilizers is also considered.

Aplikasi Bacillus subtilis pada beberapa Bahan Organik terhadap Pertumbuhan dan Produksi Tanaman Cabai Rawit (Capsicum frutescens L.)

2020 ◽  
Vol 21 (1) ◽  
pp. 14-19
Author(s):  
Praptiningsih Gamawati Adinurani ◽  
Sri Rahayu ◽  
Nurul Fima Zahroh
Keyword(s):  
Bacillus Subtilis ◽  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Capsicum Frutescens ◽  
Plant Growth Promoting ◽  
Growth Promoting

Mikroba Bacillus subtilis merupakan agen pengendali hayati mempunyai kelebihan sebagai Plant Growth Promoting Rhizobacteria (PGPR) yaitu dapat berfungsi sebagai biofertilizer, biostimulan, biodekomposer dan bioprotektan. Tujuan penelitian mengetahui potensi B. subtilis dalam merombak bahan organik sebagai usaha meningkatkan ketersediaan bahan organik tanah yang semakin menurun. Penelitian menggunakan Rancangan Petak Terbagi dengan berbagai  bahan organik sebagai petak utama (B0 = tanpa bahan organik, B1 = kotoran ayam,  B2 = kotoran kambing, B3 = kotoran sapi) dan aplikasi B.subtilis sebagai anak petak (A0 = 0 cc/L, A1 = 5cc/L, A2 = 10 cc/L, Pengamatan meliputi variabel tinggi tanaman, indeks luas daun, jumlah buah per tanaman, berat buah per tanaman, dan bahan organik tanah. Data pengamatan  dianalisis ragam  menggunakan  Statistical Product and Service Solutions (SPSS) versi 25 dan dilanjutkan dengan uji Duncan untuk mengetahui signifikansi perbedaan antar perlakuan. Hasil penelitian menunjukkan tidak terdapat interaksi antara bahan organik kotoran ternak dan konsentrasi B. subtilis terhadap semua variabel pengamatan. Potensi B. subtilis sangat baik dalam mendekomposisi bahan organik yang ditunjukkan dengan peningkatan bahan organik, dan hasil terbaik pada kotoran  sapi (B3) dan konsentrasi B. subtilis 15 mL/L masing-masing sebesar 46.47 % dan 34.76 %. Variabel pertumbuhan tidak berbeda nyata kecuali tinggi tanaman dengan pertambahan tinggi paling banyak pada pemberian kotoran kambing sebesar 170.69 %.

Sign in / Sign up

Export Citation Format

Share Document