Study of the biological effect of oligochitosan prepared by γ-CO-60 irradiation method on Spirulina platensis

Chitosan with initial molecular weight (Mw) about 193 kDa and the deacetylation degree of about 80% was irradiated by gamma rays from a Co-60 source in powder state for degradation. The results on Mw estimation by gel permeation chromatography method indicated that oligochitosan products with Mw from 3.7 to 28.9 kDa were successfully prepared by irradiation of chitosan samples at doses from 300 to 2000 kGy. The prepared oligochitosans were then supplemented into the cultivated media for investigation of the biological effect on the cyanobacteria (blue – green alga) namely Spilurina platensis. The obtained results indicated that all of radiation degraded chitosan samples showed a growth promotion effect on the enhancement of fresh and dried biomass S. platensis after 7 days supplementation. The oligochitosan product with Mw ~ 15,4 kDa obtained from the irradiation dose of 500 kGy displayed the best growth promotion effect for the tested alga and the optimum concentration for supplementation of this product was found at 100 ppm. In addition, The supplementation with 100 ppm of the oligochitosan product enhanced 49.5% the fresh biomass and 59.1% the dried biomass of the tested alga after 7 days cultivating. The addition of oligochitosan also increased the dried matter, protein, carbohydrate and lipid contents of the harvested alga product in 7.0, 23.3, 27.3 and 37.5%, respectively. It can be seen that the oligochitosan product prepared from natural organic compound by gamma Co-60 irradiation method promised to be potential used as a safe and highly effective growth promoter for alga to biomass production of S. platensis.

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The Enhancement of Antiviral Activity of Chloroinconazide by Aglinate-based Nanogel and Its Plant Growth Promotion Effect

Journal of Agricultural and Food Chemistry ◽

10.1021/acs.jafc.1c00941 ◽

2021 ◽

Author(s):

Xing Lv ◽

Mengting Yuan ◽

Yuehong Pei ◽

Changyun Liu ◽

Xiangchuan Wang ◽

...

Keyword(s):

Plant Growth ◽

Antiviral Activity ◽

Plant Growth Promotion ◽

Growth Promotion ◽

Promotion Effect

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Transcriptomic insights into growth promotion effect of Trichoderma afroharzianum TM2-4 microbial agent on tomato plants

Journal of Integrative Agriculture ◽

10.1016/s2095-3119(20)63415-3 ◽

2021 ◽

Vol 20 (5) ◽

pp. 1266-1276

Author(s):

Juan ZHAO ◽

Ting LIU ◽

Wei-cheng LIU ◽

Dian-peng ZHANG ◽

Dan DONG ◽

...

Keyword(s):

Growth Promotion ◽

Tomato Plants ◽

Promotion Effect ◽

Microbial Agent

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Bacillus subtilis ALBA01 can mitigate onion pink root symptoms caused by Setophoma terrestris

10.1101/601633 ◽

2019 ◽

Author(s):

P Sayago ◽

F Juncosa ◽

A Albarracín Orio ◽

D.F. Luna ◽

G Molina ◽

...

Keyword(s):

Bacillus Subtilis ◽

Crop Rotation ◽

Growth Promotion ◽

Disease Incidence ◽

Soil Fumigation ◽

Promotion Effect ◽

Physiological Variables ◽

Yield Parameters ◽

Onion Cultivar ◽

Setophoma Terrestris

AbstractSoil-borne pathogen Setophoma terrestris is the causal agent of pink root of onion, one of the most challenging diseases in onion production. Conventional approaches for managing the disease like solarization, soil fumigation and crop rotation have not been proven effective enough. In this work, we evaluated the biocontrol capacity of Bacillus subtilis ALBA01 (BsA01) against S. terrestris, in a highly susceptible onion cultivar, both under greenhouse and field conditions. Disease incidence and severity were evaluated together with growth, photosynthesis among other physiological variables and yield parameters. When compared with plants infected with the pathogen, those plants co-inoculated with BsA01 showed significantly less damage and levels of biocontrol above 50%. With regard to physiological parameters, plants challenged with S terrestris and inoculated with BsA01 performed as well as the control non-infected plants revealing a growth promotion effect of BsA01 on onion plants.

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Variovorax sp. Has an Optimum Cell Density to Fully Function as a Plant Growth Promoter

Microorganisms ◽

10.3390/microorganisms7030082 ◽

2019 ◽

Vol 7 (3) ◽

pp. 82 ◽

Cited By ~ 1

Author(s):

Oyungerel Natsagdorj ◽

Hisayo Sakamoto ◽

Dennis Santiago ◽

Christine Santiago ◽

Yoshitake Orikasa ◽

...

Keyword(s):

Plant Growth ◽

Cell Density ◽

Growth Promotion ◽

Growth Promoter ◽

Plant Growth Promoting Bacteria ◽

Biochemical Tests ◽

Green Pepper ◽

Plant Growth Promoter ◽

Plant Growth Promoting ◽

Growth Promoting

Utilization of plant growth-promoting bacteria colonizing roots is environmentally friendly technology instead of using chemicals in agriculture, and understanding of the effects of their colonization modes in promoting plant growth is important for sustainable agriculture. We herein screened the six potential plant growth-promoting bacteria isolated from Beta vulgaris L. (Rhizobium sp. HRRK 005, Polaromonas sp. HRRK 103, Variovorax sp. HRRK 170, Mesorhizobium sp. HRRK 190, Streptomyces sp. HRTK 192, and Novosphingobium sp. HRRK 193) using a series of biochemical tests. Among all strains screened, HRRK 170 had the highest potential for plant growth promotion, given its ability to produce plant growth substances and enzymes such as siderophores and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, respectively, concomitantly with active growth in a wider range of temperatures (10–30 °C) and pH (5.0–10.0). HRRK 170 colonized either as spots or widely on the root surface of all vegetable seedlings tested, but significant growth promotion occurred only in two vegetables (Chinese cabbage and green pepper) within a certain cell density range localized in the plant roots. The results indicate that HRRK 170 could function as a plant growth promoter, but has an optimum cell density for efficient use.

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