Cd accumulation characteristics of Salvia tiliifolia and changes of rhizospheric soil enzyme activities and bacterial communities under a Cd concentration gradient

2021 ◽  
Author(s):  
Xiong Li ◽  
Di Chen ◽  
Boqun Li ◽  
Yongping Yang
2020 ◽  
Author(s):  
Fenghui Wu ◽  
Songwen Li ◽  
Binghai Du ◽  
Xiu-Juan Wang ◽  
Xiaotong Han ◽  
...  

Abstract Background: NaHCO3 in soil leads to alkalinization and causes stress in plants, thus hindering agricultural sustainability. A strain NYJ was identified as Rheinheimera pacifica and applied into cucumber-planted soil to mitigate NaHCO3 stress in this study. We aimed to detect the taxonomy and functional potential of rhizospheric microbiome affected by NaHCO3 stress and NYJ application, obtaining NaHCO3-tolerant microbes and exploring one mechanism underlining NaHCO3 stress mitigation by NYJ application.Results: The strain NYJ grew well under 0.01-0.06 g L-1 NaHCO3 and had plant growth-promoting capacity. Application of NYJ into NaHCO3-contaminated and cucumber-planted soil improved plant growth, increased relative water contents and osmotic potential of leaves, and decreased malonaldehyde and hydrogen peroxide contents in seedlings, mitigating NaHCO3 stress in cucumber. In cucumber rhizospheric soil, Proteobacteria, Actinobacteria, and Bacteroidetes of microbes were dominant phyla with 69, 17, and 6% of total abundance. To respond to NaHCO3 stress, 669 species and 208 genera of microbes were enriched in rhizospheric soil, while 190 sodium ion-related genes, 1242 osmotic stress-related genes, and 121 other stress-related genes from microbial genera including Pseudomonas showed the increased abundances. Under NaHCO3 stress, 26 microbial genera were distributed in connectors, the interaction network of rhizospheric microbes was changed, and soil enzyme activities were decreased. When NYJ being applied into the NaHCO3-contaminated soil, 1327 species and 487 genera of microbes were enriched than those under NaHCO3 stress alone. Meantime, soil enzyme activities were increased, while 2238 symbiont- and immune-related genes and 2434 plant growth-promoting genes including 16 genes encoding chitinase had the elevated abundances in microbial genera. Moreover, NYJ negatively interacted with one bacterial genus and positively interacted with 3 microbial genera under NaHCO3 stress. As a result, 25 bacterial genera were distributed in connectors, and microbial interaction network in rhizospheric soil was different from the one caused by NaHCO3 stress alone.Conclusions: 669 NaHCO3-tolerant species and 208 NaHCO3-tolerant genera of microbes were identified. NYJ application affected microbial community structure and interaction network in rhizospheric soil, increased the abundances of genes related to symbiont, immune, and plant growth-promoting traits in microbes, and activated soil enzymes, thereby mitigating NaHCO3 stress in cucumber.1 These authors contributed equally to this work.


2017 ◽  
Vol 65 (42) ◽  
pp. 9191-9199 ◽  
Author(s):  
Yan Rong ◽  
Yi Wang ◽  
Yina Guan ◽  
Jiangtao Ma ◽  
Zhiqiang Cai ◽  
...  

2019 ◽  
Vol 49 (11) ◽  
Author(s):  
Jiayue Wan ◽  
Hexigeduleng Bao ◽  
Lihong Huang ◽  
Yanfei Ding ◽  
Zhixiang Chen ◽  
...  

ABSTRACT: Toxic metals contamination of soil has become a serious problem in recent years. In this study, Chinese cabbage (a relatively high-accumulator of cadmium (Cd)) and cabbage (a relatively low-accumulator of Cd) were cultured in monoculture and in intercropping in the Cd-contaminated soil, to evaluate the effect of intercropping on the alteration of Cd extraction. Both the pot experiments and field experiments indicated that intercropping increased the Cd extraction by Chinese cabbage and decreased the Cd extraction by cabbage. Thus, Cd extraction was advanced while safe production was obtained. Further pot experiment was conducted to investigate the alterations of soil Cd fractions, soil pH, and soil enzyme activities to reveal their possible relationship with Cd extraction between different planting patterns. Results revealed that three individual Chinese cabbages in one intercropping pot played the same effect on alteration of these factors as six individual Chinese cabbages in one monoculture pot. The intercropping increased Cd extraction by Chinese cabbage and decreased Cd extraction by cabbage, probably by influencing mechanisms such as soil enzyme activities (especially the urease activity) in the cultivation system. Effect of intercropping on Cd accumulation is an important issue in cultivation of vegetables in potentially contaminated land.


2017 ◽  
Vol 109 (4) ◽  
pp. 1271-1279
Author(s):  
Ming Xie ◽  
Yan-Jun Zhang ◽  
De-Liang Peng ◽  
Qian Li ◽  
Xin-Ping Hu ◽  
...  

Agronomy ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 694
Author(s):  
Obinna Ezeokoli ◽  
Valter Nuaila ◽  
Chinedu Obieze ◽  
Belo Muetanene ◽  
Irene Fraga ◽  
...  

Soil ecosystem perturbation due to agronomic practices can negatively impact soil productivity by altering the diversity and function of soil health determinants. Currently, the influence of rice cultivation and off-season periods on the dynamics of soil health determinants is unclear. Therefore, soil enzyme activities (EAs) and bacterial community compositions in rice-cultivated fields at postharvest (PH) and after a 5-month off-season period (5mR), and fallow-fields (5-years-fallow, 5YF; 10-years-fallow, 10YF and/or one-year-fallow, 1YF) were assessed in two agroecological regions of Mozambique. EAs were mostly higher in fallow fields than in PH, with significant (p < 0.05) differences detected for β-glucosidase and acid phosphatase activities. Only β-glucosidase activity was significantly (p < 0.05) different between PH and 5mR, suggesting that β-glucosidase is responsive in the short-term. Bacterial diversity was highest in rice-cultivated soil and correlated with NO3−, NH4+ and electrical conductivity. Differentially abundant genera, such as Agromyces, Bacillus, Desulfuromonas, Gaiella, Lysobacter, Micromonospora, Norcadiodes, Rubrobacter, Solirubrobacter and Sphingomonas were mostly associated with fallow and 5mR fields, suggesting either negative effects of rice cultivation or the fallow period aided their recovery. Overall, rice cultivation and chemical parameters influenced certain EAs and shaped bacterial communities. Furthermore, the 5-month off-season period facilitates nutrient recovery and proliferation of plant-growth-promoting bacteria.


2020 ◽  
Vol 707 ◽  
pp. 135634 ◽  
Author(s):  
Yufan Fei ◽  
Shunyin Huang ◽  
Haibo Zhang ◽  
Yazhi Tong ◽  
Dishi Wen ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document