Role of Bacillus inoculation in rice straw composting and bacterial community stability after inoculation: Unite resistance or individual collapse

Zhang, Shubo; Xia, Tianyi; Wang, Jialin; Zhao, Yue; Xie, Xinglong; Wei, Zimin; Zhang, Xu; Song, Chen; Song, Xinyu

doi:10.1016/j.biortech.2021.125464

Cited by 52 publications

(15 citation statements)

References 54 publications

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“…Previous research showed that inoculation of bacteria and chemicals may all affect the microbial interaction model. Zhang et al (2021) observed this following the inoculation of Bacillus H2 during rice straw composting. The highly connected networks in the MC, which were revealed by the links, average degree, and average path degree, provided more functional redundancy and system stability for the bacterial community in the MC.…”

Section: Discussionmentioning

confidence: 84%

Matured compost amendment improves compost nutrient content by changing the bacterial community during the composting of Chinese herb residues

Song

Luo

et al. 2023

Front. Microbiol.

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Composting is a sustainable strategy to deal with organic waste. Our research aimed to study the influence of an amendment of 10% matured compost (MC) during Chinese herb residue (CHR) compost. Here, a 60-day CHR compost was performed, and MC application was able to reduce the nitrogen loss and enhance the humic acid accumulation during the composting as compared with the non-inoculated control (NC), by 25 and 19%, respectively. Furthermore, the matured compost amendment improved the diversity of the bacterial community, increased the complexity of the co-occurrence network, and changed the keystone and module hub bacteria during composting. The increased abundance levels of Thermopolyspora, Thermobispora, and Thermosporomyces, which were significantly higher in MC than in NC, may contribute to the degradation of cellulose and the formation of humic acid. Overall, this study extends our understanding of the effects of matured compost reflux on compost quality and the bacterial community.

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Section: Discussionmentioning

confidence: 84%

Matured compost amendment improves compost nutrient content by changing the bacterial community during the composting of Chinese herb residues

Song

Luo

et al. 2023

Front. Microbiol.

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“…According to earlier reports, the bacterial populations degrading the straw under anoxic conditions comprised mainly of Clostridium species with Bacillus species as one of the minor groups (Weber et al 2001), while Bacillus species were predominant during composting of rice straw (Hefnawy et al 2013). In fact, Bacillus species is used as an inoculant in rice straw composting for which they play an important role in degradation of cellulose and hemicellulose (Zhang et al 2021). Mild alkaline pretreatment of rice straw and dry matter loss Alkaline pretreatment of the dried rice straw was tested with 2% NaOH, 2% Ca(OH) 2 and 20% aqueous NH 3 , respectively, at solid:liquid ratio of 1:10.…”

Section: Resultsmentioning

confidence: 99%

“…Further improvements in PHA content and productivity are possible by medium optimization and using fed-batch mode of cultivation. It would also be interesting to investigate PHA producing ability of certain Bacillus species that are involved in composting of rice straw through their polysaccharide degrading activities (Hefnawy et al 2013;Zhang et al 2021), which would avoid the need for pretreatment and reduce costs.…”

Section: Discussionmentioning

confidence: 99%

Bacterial Isolates from Decomposing Rice Straw used for Polyhydroxyalkanoate Production from Straw Hydrolysate Obtained by Alkaline Pretreatment and Enzymatic Hydrolysis

Thược

Chung

Hatti‐Kaul

2021

Preprint

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Rice straw is an important low cost feedstock for bio-based economy. This report presents a study in which rice straw was used both as a source for isolation of bacteria producing the biodegradable polyester polyhydroxyalkanoate (PHA), as well as the carbon source for the production of the polymer by the isolated bacteria. Of the 100 bacterial isolates, seven were found to be positive for PHA production by Nile blue staining and were identified as Bacillus species by 16S rRNA gene sequence analysis. Three isolates showed 100% sequence identity to B. cereus, one to B. paranthracis, two with 99 and 100% identity to B. anthracis, while one was closely similar to B. thuringensis. For use in PHA production, rice straw was subjected to mild alkaline pretreatment followed by enzymatic hydrolysis. Comparison of pretreatment by 2% sodium hydroxide, 2% calcium hydroxide and 20% aqueous ammonia, respectively, at different temperatures showed maximum weight loss with NaOH at 80 °C for 5 hours, but ammonia for 15 h at 80 °C led to highest lignin removal of 63%. The ammonia pretreated rice straw also led to highest release of total reducing sugar up to 92% on hydrolysis by a cocktail of cellulases and hemicellulose at 50 °C. Cultivation of the Bacillus isolates on the pretreated rice straw revealed highest PHA content of 59.3 and 46.4%, and PHA concentration of 2.96 and 2.51 g/L by Bacillus cereus VK92 and VK98, respectively.

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“…For instance, the related strains, such as Bacillus , harbour abundant genes encoding glycoside hydrolases and glycosyl transferases that are used for cellulose degradation [ 53 ]. As a dominant strain, Bacillus inoculated on rice straw could improve the microenvironment and accelerate the assembly of bacterial communities to degrade lignocellulose [ 54 ]. Muñoz et al.…”

Section: Biological Pretreatmentmentioning

confidence: 99%

Lignocellulose dissociation with biological pretreatment towards the biochemical platform: A review

Peng

Zhang

et al. 2022

Materials Today Bio

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Role of Bacillus inoculation in rice straw composting and bacterial community stability after inoculation: Unite resistance or individual collapse

Cited by 52 publications

References 54 publications

Matured compost amendment improves compost nutrient content by changing the bacterial community during the composting of Chinese herb residues

Matured compost amendment improves compost nutrient content by changing the bacterial community during the composting of Chinese herb residues

Bacterial Isolates from Decomposing Rice Straw used for Polyhydroxyalkanoate Production from Straw Hydrolysate Obtained by Alkaline Pretreatment and Enzymatic Hydrolysis

Lignocellulose dissociation with biological pretreatment towards the biochemical platform: A review

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