scholarly journals Plant Growth Promotional Effect of Azotobacter chroococcum, Piriformospora indica and Vermicompost on Rice Plant

1970 ◽  
Vol 9 ◽  
pp. 85-90 ◽  
Author(s):  
Kamil Prajapati ◽  
K. D. Yami ◽  
A. Singh
Keyword(s):  
Nitrogen Fixation ◽  
Rice Plant ◽  
Growth Promotion ◽  
Oryza Sativa L ◽  
Azotobacter Chroococcum ◽  
Piriformospora Indica ◽  
Root Weight ◽  
Positive Effects ◽  
Panicle Number ◽  
Dual Inoculation

The activities of rhizospheric organisms have been well recognized in non-leguminous plants such as tropical grasses, rice and maize. Such activities include nitrogen fixation, phosphate solubilization and mineralization that are beneficial for the overall growth and development of the plant. An experiment was carried out to study the growth promotion of rice (Oryza sativa L.) due to dual inoculation of Azotobacter chroococcum and Piriformospora indica along with vermicompost. The effects on shoot length, root length, fresh shoot and root weight, dry shoot and root weight, and panicle number on 45th day and 90th day were investigated. In both the stages these parameters of all the treated plants were significantly (P<0.05) greater than the uninoculated control. Dual inoculated plants in presence of vermicompost gave better positive effects on both 45th day and 90th day, in comparison to single inoculation of A. chroococcum, P. indica and vermicompost. However, A. chroococcum treated plants showed significant decrease in dry root weight as compared to control plants on 90th day observation. This suggested that dual inoculation of A. chroococcum and P. indica had beneficiary response on growth of rice plant. Key words: rice; Azotobacter chroococcum; Piriformospora indica; vermicompost; mycorrhizae nitrogen fixation DOI: 10.3126/njst.v9i0.3170 Nepal Journal of Science and Technology 9 (2008) 85-90

scholarly journals Plant growth promotion effect of plasma activated water on Lactuca sativa L. cultivated in two different volumes of substrate

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Vasile Stoleru ◽  
Radu Burlica ◽  
Gabriela Mihalache ◽  
Delicia Dirlau ◽  
Silvica Padureanu ◽  
...  
Keyword(s):  
Lactuca Sativa ◽  
Small Volume ◽  
Growth Promotion ◽  
Dry Weight ◽  
Leaf Length ◽  
Root Weight ◽  
Positive Effects ◽  
Lactuca Sativa L ◽  
Nitrates Content ◽  
Plasma Activated Water

AbstractPlasma activated water (PAW) can represent an alternative to chemical fertilizers in agriculture. The effects of PAW treatment applied in two concentrations (1.5 or 3.0 mg L−1 NO3−) on some morphological, physiological, biochemical parameters and yield of Lactuca sativa L. grown in two different pot volumes (400 or 3200 cm3) were investigated in this study. The results showed that both PAW concentrations did not influence the germination, once the process was initiated. Positive effects of the treatments were registered on the length of radicle and hypocotyls of lettuce at a concentration of 1.5 mg L−1 NO3− (PAW I), the chlorophyll content was significantly increased at a concentration of 3.0 mg L−1 NO3− (PAW II) and bigger pot volume, also the foliar weight and area. No significant differences between the treated and untreated plants were recorded for the root weight, leaf length and width. The dry weight was significantly higher for the lettuce treated with PAW I and II grown in big volume pots at 57 days after transplanting (DAT) and small volume pots at 64 DAT. The nitrites content of the lettuce grown in big pots was lower than of the lettuce grown in small pots, regardless of the PAW treatment. Contrary, the nitrates content was higher in the lettuce grown in big pots (up to 36.4 mg KNO3/g DW), compared to small pots (under 0.3 mg KNO3/g DW).

scholarly journals Archaea, bacteria and termite, nitrogen fixation and sustainable plants production

2021 ◽  
Vol 49 (2) ◽  
pp. 12172
Author(s):  
Wenli SUN ◽  
Mohamad H. SHAHRAJABIAN ◽  
Qi CHENG
Keyword(s):  
Nitrogen Fixation ◽  
Specific Activity ◽  
Rhizobium Meliloti ◽  
Growth Promotion ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Plant Growth Promoting Rhizobacteria ◽  
Rhizobium Japonicum ◽  
Positive Effects ◽  
Plant Growth Promoting

Certain bacteria and archaea are responsible for biological nitrogen fixation. Metabolic pathways usually are common between archaea and bacteria. Diazotrophs are categorized into two main groups namely: root-nodule bacteria and plant growth-promoting rhizobacteria. Diazotrophs include free living bacteria, such as Azospirillum, Cupriavidus, and some sulfate reducing bacteria, and symbiotic diazotrophs such Rhizobium and Frankia. Three types of nitrogenase are iron and molybdenum (Fe/Mo), iron and vanadium (Fe/V) or iron only (Fe). The Mo-nitrogenase have a higher specific activity which is expressed better when Molybdenum is available. The best hosts for Rhizobium legumiosarum are Pisum, Vicia, Lathyrus and Lens; Trifolium for Rhizobium trifolii; Phaseolus vulgaris, Prunus angustifolia for Rhizobium phaseoli; Medicago, Melilotus and Trigonella for Rhizobium meliloti; Lupinus and Ornithopus for Lupini, and Glycine max for Rhizobium japonicum. Termites have significant key role in soil ecology, transporting and mixing soil. Termite gut microbes supply the enzymes required to degrade plant polymers, synthesize amino acids, recycle nitrogenous waste and fix atmospheric nitrogen. The positive effects of Arbuscular mycorrhizal (AM) fungi such as growth promotion, increased root length, leaf area, stem diameter, transplant performance and tolerance to stresses have been reported previously.

scholarly journals Isolation and Characterization of Plant Growth Promoting Rhizobacteria for Growth Promotion of Rice (Oryza sativa L.) and Wheat (Triticum aestivum)

2021 ◽  
Vol 2 (2) ◽  
pp. 177-194
Author(s):  
Muhammad Ayyaz ◽  
Zulqurnain Khan ◽  
Nabila Tabassam ◽  
Tariq Sultan ◽  
Amjad Saeed ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Plant Growth ◽  
Growth Promotion ◽  
Growth Parameters ◽  
Oryza Sativa L ◽  
Growth Enhancement ◽  
Root Weight ◽  
Bacterial Strains ◽  
Phosphorus Solubilization ◽  
Isolation And Characterization

The use of rhizobacteria for plant growth enhancement is decades old. Still, in this era of the 21st century, biofertilizers have become the need of the day due to the health and environmental concerns associated with chemical fertilizers and pesticides. Rhizobacteria strains were isolated from the rhizosphere of rice and wheat. The selected bacterial strains' nitrogen fixation, indole acetic acid (IAA) production, phosphorus solubilization, and antifungal activity were determined on morphological, biochemical, and molecular levels. Production of IAA ranged from 6 µg/ml to 29.33 µg/ml. Ethylene production (C2H4/hr) varied from 2 µmoles to 9.8 µmoles. Maximum Phosphorus Solubilization index (7), decrease in pH (4) and Solubilization % age (0.49) was observed in WM-2 (wheat microbe). Promising results were obtained concerning antifungal activity against Rhizoctonia solani and Fusarium sp. The effect of the potential PGPR strains on the germination of rice and wheat was significantly positive in Petri plates. In the case of rice, the highest shoot length (29.27 cm) was observed by inoculation with RPR-33 (Rice isolate), and the most increased root length (9.33 cm) was observed in the treatment inoculated with RPR-42. The highest shoot fresh weight (476.67 mg/plant) was recorded in the treatment inoculated with RPR-42. The maximum root weight was 170 mg/plant in the same treatment. For wheat, all recorded growth parameters were improved significantly by wheat microbe WM-5. All the PGPR isolates showed positive results for growth parameters of wheat and rice on inoculation. So, it is suggested that these PGPR isolates may be used in potential biofertilizers.

scholarly journals Isolation and Characterization of Salt Tolerant Endophytic and Rhizospheric Plant Growth-Promoting Bacteria (PGPB) Associated with the Halophyte Plant (Sesuvium Verrucosum) Grown in KSA

2015 ◽  
Vol 3 (3) ◽  
pp. 552-560 ◽  
Author(s):  
Mohamed A.M. El-Awady ◽  
Mohamed M. Hassan ◽  
Yassin M. Al-Sodany
Keyword(s):  
Nitrogen Fixation ◽  
Acetic Acid ◽  
Plant Growth ◽  
Growth Promotion ◽  
Exponential Growth Phase ◽  
Plant Growth Promoting Bacteria ◽  
Salt Tolerant ◽  
Isolation And Characterization ◽  
Growth Promoting

This study was designed to isolate and characterize endophytic and rhizospheric bacteria associated with the halophyte plant Sesuvium verrucosum, grown under extreme salinity soil in Jeddah, Saudi Arabia. The plant growth promotion activities of isolated bacterial were evaluated in vitro. A total of 19 salt tolerant endophytic and rhizospheric bacterial isolates were obtained and grouped into six according to genetic similarity based on RAPD data. These six isolates were identified by amplification and partial sequences of 16S rDNA as Enterobacter cancerogenus,Vibrio cholerae, Bacillus subtilis, Escherichia coli and two Enterobacter sp. Isolates were then grown until exponential growth phase to evaluate the atmospheric nitrogen fixation, phosphate solubilization, and production of phytohormones such as indole-3-acetic acid, as well as 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity. While, All of the six strains were negative for ACC deaminaseactivity, two isolates showed Nitrogen fixation activity, three isolates produce the plant hormone (Indole acetic acid) and two isolates have the activity of solubiliztion of organic phosphate. Among the six isolates, the isolate (R3) from the soil around the roots is able to perform the three previous growth promoting possibilities together and it is ideal for use in promoting the growth of plants under the high salinity conditions. This isolate is candidate to prepare a friendly biofertelizer that can be used for the improvement of the crops performance under salinity conditions.Int J Appl Sci Biotechnol, Vol 3(3): 552-560

Metabolism of glycolic acid by Azotobacter chroococcum PRL H62

1973 ◽  
Vol 19 (3) ◽  
pp. 321-324 ◽  
Author(s):  
W. G. W. Kurz ◽  
T. A. G. LaRue
Keyword(s):  
Nitrogen Fixation ◽  
Dicarboxylic Acid ◽  
Glycolic Acid ◽  
Tca Cycle ◽  
Azotobacter Chroococcum ◽  
Acid Cycle ◽  
Isocitric Dehydrogenase ◽  
Tca Cycle Enzymes ◽  
The Tca Cycle ◽  
Reduced Nitrogen

When Azotobacter chroococcum grows on glycolic acid as sole C source, it cannot utilize N2 and must be provided with reduced nitrogen. Glycolic acid is metabolized via Kornberg's dicarboxylic acid cycle. The TCA cycle enzymes are low in activity, and isocitric dehydrogenase is absent. It is likely that isocitric dehydrogenase is the source of reductant for nitrogen fixation by Azotobacter nitrogenase.

Note on the effect of temperature on a mixed culture of two organisms in symbiotic relation

1939 ◽  
Vol 29 (2) ◽  
pp. 302-305 ◽  
Author(s):  
E. H. Richards
Keyword(s):  
Nitrogen Fixation ◽  
Mixed Culture ◽  
Azotobacter Chroococcum ◽  
Mixed Cultures ◽  
Effect Of Temperature ◽  
Two Temperatures ◽  
Symbiotic Relation

1. A study was made of nitrogen-fixation byAzotobacter chroococcumalone in a medium containing dextrose (which it can utilize) and in mixture with a coliform organism on a medium containing no carbohydrate except starch, whichAzotobactercannot utilize unless it be hydrolysed by the coliform organism or some other agency.2. The amount of nitrogen fixed in the mixed cultures was found to be maximal at two temperatures, and a discussion is given of the causes thought to be operative in producing the double maximum.

Influence of sulfur on the accumulation of mercury in rice plant ( Oryza sativa L.) growing in mercury contaminated soils

Chemosphere ◽  
2017 ◽  
Vol 182 ◽  
pp. 293-300 ◽  
Author(s):  
Yunyun Li ◽  
Jiating Zhao ◽  
Jingxia Guo ◽  
Mengjiao Liu ◽  
Qinlei Xu ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Contaminated Soils ◽  
Rice Plant ◽  
Oryza Sativa L

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.

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