Plant Growth Promotion by<i>Bacillus</i>and Relatives

Chanway, C. P.

doi:10.1002/9780470696743.ch15

Cited by 19 publications

(19 citation statements)

References 77 publications

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“…Several strains of B. subtilis have proven to be efficient in plant growth promotion (Bai et al, 2003;Chanway, 2002). The strain CC-pg104 used in the present study also displayed several enzyme activities including IAA production.…”

Section: Discussionmentioning

confidence: 70%

Encapsulation of plant growth‐promoting bacteria in alginate beads enriched with humic acid

Young¹,

Rekha²,

Lai³

et al. 2006

Biotech & Bioengineering

154

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The key to achieving successful, reproducible results following the introduction of beneficial microbes into soil relies on the survival rate of the inoculated bacteria in a heterogeneous soil environment and hence an improved encapsulation method was developed. Owing to the constraints associated with the inoculum formulation, in this study, encapsulation of a plant growth promoting bacteria (PGPB) isolate Bacillus subtilis CCpg104 was attempted with alginate by enriching the bead microenvironment with humic acid. High viability of the encapsulated bacteria was observed with minimum cell loss upon storage for 5 months. Steady and constant cell release from the bead was observed for 1 week at different pH. Encapsulated cells remained active as evidenced by their ability to solubilize calcium phosphate in vitro. Successful plant growth promotion of lettuce by the encapsulated bacteria under gnotobiotic and sterile environment was also achieved. Feasibility of this improved encapsulation technique is mainly due to the dual benefits of humic acid to microbe and plant and its chemical properties allowing an easy mixing with alginate without interfering in the formation of the alginate gel beads by cross-linking with Ca 2þ ions. Thus, the encapsulation method described in this study can be effectively used to protect the PGPB inoculum from adverse conditions of the soil for their successful establishment in the rhizosphere. ß

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Section: Discussionmentioning

confidence: 70%

Encapsulation of plant growth‐promoting bacteria in alginate beads enriched with humic acid

Young¹,

Rekha²,

Lai³

et al. 2006

Biotech & Bioengineering

154

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“…These include agriculturally-important species such as rice, wheat, barley, potato and several vegetable crops (Dobelaere et al, 2003). While it is logical to assume diazotrophic rhizosphere bacteria enhance plant growth through BNF, these microorganisms are often capable of producing plant growth-enhancing phytohormones and pathogen-suppressing antibiotics (Chanway, 2002). Many are also able to enhance the availability of N, P and S in the rhizosphere enzymatically, rendering it difficult to conclude with certainty the mechanism by which plant growth is stimulated.…”

Section: Rhizosphere Bacteriamentioning

confidence: 99%

“…In addition to high %Ndfa, 13-month old seedlings treated with P2b-2R also accumulated significantly more biomass (78%) than controls, and had overcome the growth inhibition observed in seedlings of younger ages. While P. polymyxa possesses several characteristics that can result in plant growth promotion (Chanway, 2002), the enhanced performance of 13-month old seedlings was likely caused by an increase in the amount of N derived from BNF because the proportion of foliar N from BNF (68%-79%) (Anand et al, 2013) in older seedlings was only marginally higher than that of ninemonth old seedlings (64%-66%) (Bal & Chanway, 2012a), but the concentration of foliar N (2.35%) (Anand et al, 2013) was 5-fold greater than nine-month old seedlings. The difference in total foliar N content, i.e., foliar N concentration x foliar biomass, was even greater and represented an elevation of foliar N concentration from a level considered to be very severely N deficient in all nine-month old seedlings (Bal & Chanway, 2012a) and the 13-month old controls (Anand et al, 2013) to one that is adequate for healthy lodgepole pine (Ballard & Carter, 1986).…”

Section: Nitrogen Fixation In Gymnosperms: Effects On Seedling Growthmentioning

confidence: 99%

Nitrogen Fixation Outside and Inside Plant Tissues

Chanway¹,

Anand²,

Yang³

2014

Advances in Biology and Ecology of Nitrogen Fixation

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“…Their mode of action in antagonism is mainly antibiosis by producing many antagonistic substances, and sometimes competition, but rarely hyperparasitism (Chanway, 2002;Dijksterhuis et al, 1999;Haggag, 2007;Haggag and Timmusk, 2008;Helbig, 2001;Khan et al, 2008). Our study, however, suggests that antagonistic microbes even with the same antibiosis mode of action may target different points in the life cycle of a pathogen, presumably resulting in different control efficacies of the specific disease caused by the pathogen.…”

Section: Discussionmentioning

confidence: 74%

“…Bacillus and relatives (including Paenibacillus) form endospores that are resistant to environmental stresses such as desiccation, whose characteristics are useful in producing commercial microbial agents with a long shelf-life compared with pseudomonad-based biofungicides (Chanway, 2002;Walker et al, 1998). Their mode of action in antagonism is mainly antibiosis by producing many antagonistic substances, and sometimes competition, but rarely hyperparasitism (Chanway, 2002;Dijksterhuis et al, 1999;Haggag, 2007;Haggag and Timmusk, 2008;Helbig, 2001;Khan et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Comparison of Microbial Fungicides in Antagonistic Activities Related to the Biological Control of Phytophthora Blight in Chili Pepper Caused by Phytophthora capsici

Kim¹,

Jang²,

Kim³

et al. 2010

The Plant Pathology Journal

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Two similar microbial fungicides (termed as MA and MB) developed in a Korean biopesticide company were analyzed and compared each other in their biocontrol activities against the phytophthora blight of chili pepper caused by Phytophthora capsici. MA and MB contained the microbe Paenibacillus polymyxa and Bacillus subtilis, respectively, with concentrations over those posted on the microbial products. In comparison of the isolated microbes (termed as MAP from MA and MBB from MB) in the antagonistic activities against P. capsici was effective, prominently against zoospore germination, while MBB only significantly inhibited the mycelia growth of the pathogen. Some effectiveness of MAP and MBB was noted in the inhibition of zoosporangium formation and zoospore release from zoosporangia; however, no such large difference between MAP and MBB was noted. In a pot experiment, MA reduced the severity of the phytophthora blight more than MB, suggesting that the disease control efficacy would be more attributable to the inhibition of zoospore germination than mycelia growth of P. capsici. These results also suggest that the similar microbes MA and MB targeting different points in the life cycle of the pathogen differ in the disease control efficacies. Therefore, to develop microbial fungicides it is required to examine the targeting points in the pathogen's life cycle as well as the action mode of antagonistic microorganisms.

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Plant Growth Promotion byBacillusand Relatives

Cited by 19 publications

References 77 publications

Encapsulation of plant growth‐promoting bacteria in alginate beads enriched with humic acid

Encapsulation of plant growth‐promoting bacteria in alginate beads enriched with humic acid

Nitrogen Fixation Outside and Inside Plant Tissues

Comparison of Microbial Fungicides in Antagonistic Activities Related to the Biological Control of Phytophthora Blight in Chili Pepper Caused by Phytophthora capsici

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