Amelioration of drought effects in wheat and cucumber by the combined application of super absorbent polymer and potential biofertilizer

Li, Yongbin; Shi, Haowen; Zhang, Haowei; Chen, Sanfeng

doi:10.7717/peerj.6073

Cited by 37 publications

(21 citation statements)

References 96 publications

(97 reference statements)

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“…For example, chitosan-immobilized aggregated Methylobacterium oryzae CBMB20 has been used as a bioinoculant to promote growth of tomato under salt stress conditions (Chanratana et al, 2019). Li et al (2019) also showed synergistic use of a Super Absorbent Polymer (SAP) along with PGPR strains of Paenibacillus beijingensis BJ-18 and Bacillus sp. L-56 to overcome salinity stress in wheat and cucumber.…”

Section: Future Prospectsmentioning

confidence: 99%

Salt-Tolerant Plant Growth Promoting Rhizobacteria for Enhancing Crop Productivity of Saline Soils

et al. 2019

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Soil salinity has emerged as a serious issue for global food security. It is estimated that currently about 62 million hectares or 20 percent of the world's irrigated land is affected by salinity. The deposition of an excess amount of soluble salt in cultivable land directly affects crop yields. The uptake of high amount of salt inhibits diverse physiological and metabolic processes of plants even impacting their survival. The conventional methods of reclamation of saline soil which involve scraping, flushing, leaching or adding an amendment (e.g., gypsum, CaCl 2 , etc.) are of limited success and also adversely affect the agro-ecosystems. In this context, developing sustainable methods which increase the productivity of saline soil without harming the environment are necessary. Since long, breeding of salt-tolerant plants and development of salt-resistant crop varieties have also been tried, but these and aforesaid conventional approaches are not able to solve the problem. Salt tolerance and dependence are the characteristics of some microbes. Salt-tolerant microbes can survive in osmotic and ionic stress. Various genera of salt-tolerant plant growth promoting rhizobacteria (ST-PGPR) have been isolated from extreme alkaline, saline, and sodic soils. Many of them are also known to mitigate various biotic and abiotic stresses in plants. In the last few years, potential PGPR enhancing the productivity of plants facing salt-stress have been researched upon suggesting that ST-PGPR can be exploited for the reclamation of saline agro-ecosystems. In this review, ST-PGPR and their potential in enhancing the productivity of saline agro-ecosystems will be discussed. Apart from this, PGPR mediated mechanisms of salt tolerance in different crop plants and future research trends of using ST-PGPR for reclamation of saline soils will also be highlighted.

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Section: Future Prospectsmentioning

confidence: 99%

Salt-Tolerant Plant Growth Promoting Rhizobacteria for Enhancing Crop Productivity of Saline Soils

et al. 2019

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“…Seedling growth assays were performed in plastic pots (diameter of 9 cm; height of 12 cm) filled with 1 kg low nutrition-content soil. The collection and physicochemical properties of soil were described by Li et al (2019b). The treatments contained: (1) wheat seedling inoculated with Paenibacillus sp.…”

Section: Plant Culture and Collectionmentioning

confidence: 99%

Phosphate solubilizing bacteria stimulate wheat rhizosphere and endosphere biological nitrogen fixation by improving phosphorus content

Li¹,

Qin²,

Guan³

et al. 2020

PeerJ

Self Cite

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Phosphate (P) availability often limits biological nitrogen fixation (BNF) by diazotrophic bacteria. In soil, only 0.1% of the total P is available for plant uptake. P solubilizing bacteria can convert insoluble P to plant-available soluble P (ionic P and low molecular-weight organic P). However, limited information is available about the effects of synergistic application of diazotrophic bacteria and P solubilizing bacteria on the nitrogenase activity of rhizosphere and nifH expression of endosphere. In this study, we investigated the effects of co-inoculation with a diazotrophic bacterium (Paenibacillus beijingensis BJ-18) and a P-solubilizing bacterium (Paenibacillus sp. B1) on wheat growth, plant and soil total N, plant total P, soil available P, soil nitrogenase activity and the relative expression of nifH in plant tissues. Co-inoculation significantly increased plant biomass (length, fresh and dry weight) and plant N content (root: 27%, shoot: 30%) and P content (root: 63%, shoot: 30%). Co-inoculation also significantly increased soil total N (12%), available P (9%) and nitrogenase activity (69%) compared to P. beijingensis BJ-18 inoculation alone. Quantitative real-time PCR analysis showed co-inoculation doubled expression of nifH genes in shoots and roots. Soil nitrogenase activity and nifH expression within plant tissues correlated with P content of soil and plant tissues, which suggests solubilization of P by Paenibacillus sp. B1 increased N fixation in soils and the endosphere. In conclusion, P solubilizing bacteria generally improved soil available P and plant P uptake, and considerably stimulated BNF in the rhizosphere and endosphere of wheat seedlings.

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“…These two effects decreased the negative influence of extreme environmental factors and native microbial competence on XT13 and XT14, possibly extending tolerance in Guinea grass longer. Recent evidence has demonstrated that the use of integrating super absorbent polymers (SAP) with PGPB in liquid cultivations is a viable stratey to mitigate the effects of drought in wheat and cucumber (Li et al 2019). In addition, other studies in China have demonstrated that poly-γ-glutamic acid (γ-PGA) synthesis by the two Bacillus subtilis and their application increased resistance to drought in maize improving growth of microbial populations Bacillus, Pseudomonas, Burkholderia, Talaromyces and Rhizopus in soil (Yin et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Enhancement of drought tolerance on guinea grass by dry alginate macrobeads as inoculant of Bacillus strains

Mendoza-Labrador

Romero-Perdomo

Hernández³

et al. 2019

Preprint

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Drought is responsible for almost 70% of total crop damage in tropical and subtropical countries. In the Colombian Caribbean, drought has caused low availability of Guinea grass (Megathyrsus maximus) in forage amount and quality, generating increase in production costs in livestock systems. In this study, we aimed at designing and evaluating dry macro-polymeric inoculants of Bacillus strains and used them successfully to mitigate drought effect on Guinea grass (M. maximus). We chose Bacillus sp XT13 and Bacillus megaterium XT14 strains, previously selected for their capacity to mitigate drought stress on Guinea grass. For the inoculant formulation process, a concentration of 3.2% alginate was used for both microorganisms, selecting the polymer-bacterium ratio of 70:30 for XT13 and 80:20 for XT14. The results of the experiments in greenhouse showed that drought had a negative effect on Guinea grass growth, but the PGPB application with or without macro-polymeric dry matrix improved plant growth significantly. We also observed that co-inoculation of the strains generated a greater beneficial effect than individual inoculation. Interestingly, co-inoculation of XT13 and XT14 under the dry macro-polymeric formulation increased biomass production of the aerial part (7.32%), root biomass, (25.3%), nutritional quality parameters, such as digestibility (3.32%), protein (20.3%); proline accumulation increased (21.06%) and both neutral digestible fiber (2.43%) and APX antioxidant activity (24.2%) decreased with respect to co-inoculation of both bacteria without formulation. These findings have shown that dry macrobeads immobilization has a significantly positive influence on the capacity of XT13 and XT14 bacterial strains to induce drought stress tolerance in Guinea grass.

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Amelioration of drought effects in wheat and cucumber by the combined application of super absorbent polymer and potential biofertilizer

Cited by 37 publications

References 96 publications

Salt-Tolerant Plant Growth Promoting Rhizobacteria for Enhancing Crop Productivity of Saline Soils

Salt-Tolerant Plant Growth Promoting Rhizobacteria for Enhancing Crop Productivity of Saline Soils

Phosphate solubilizing bacteria stimulate wheat rhizosphere and endosphere biological nitrogen fixation by improving phosphorus content

Enhancement of drought tolerance on guinea grass by dry alginate macrobeads as inoculant of Bacillus strains

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