Biochar and alternate wetting-drying cycles improving rhizosphere soil nutrients availability and tobacco growth by altering root growth strategy in Ferralsol and Anthrosol

2022 ◽  
Vol 806 ◽  
pp. 150513
Author(s):  
Xuezhi Liu ◽  
Yingying Ma ◽  
Kiril Manevski ◽  
Mathias Neumann Andersen ◽  
Yue Li ◽  
...  
Keyword(s):  
Root Growth ◽  
Soil Nutrients ◽  
Rhizosphere Soil ◽  
Growth Strategy ◽  
Nutrients Availability ◽  
Tobacco Growth

Pseudomonas species isolated from tobacco seed promote root growth and reduce lead contents in Nicotiana tobacum K326

2019 ◽  
Vol 65 (3) ◽  
pp. 214-223 ◽  
Author(s):  
Juan Li ◽  
Bufan Zheng ◽  
Ruiwen Hu ◽  
Yongjun Liu ◽  
Yongfeng Jing ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Root Growth ◽  
Endophytic Bacteria ◽  
Tobacco Seed ◽  
Nicotiana Tobacum ◽  
Tobacco Seeds ◽  
Pseudomonas Species ◽  
Phosphorus And Potassium ◽  
Indole 3 Acetic Acid ◽  
Tobacco Growth

Endophytic bacteria are generally helpful for plant growth and protection. We isolated from tobacco seeds three Pseudomonas strains (K03, Y04, and N05) that could produce siderophores, indole-3-acetic acid, and 1-aminocyclopropane-1-carboxylate deaminase, fix nitrogen, dissolve phosphorus and potassium, and tolerate heavy metals. In pot experiments, the three isolated strains significantly promoted root growth and increased the root enzyme activity in Nicotiana tobacum K326. Furthermore, bacterial inoculations increased the proportion of residual lead (Pb) by 8.36%–51.63% and decreased the total Pb content by 3.28%–6.38% in the contaminated soil during tobacco planting, compared with uninoculated soils. An effective decrease in Pb content was also found in tobacco leaves with bacterial inoculations. K03 inoculation decreased the Pb content in the upper leaves by 49.80%, and Y04 inoculation had the best effect, decreasing the Pb content in the middle leaves by 70.12%. Additionally, soil pH and root activity had significant effects on transformation and translocation of Pb. The study suggested that in response to Pb pollution in soil, a reasonable application of endophytes (e.g., Pseudomonas) might be a promising approach in promoting tobacco growth and reducing Pb content in tobacco, while simultaneously enhancing Pb stabilization in soils.

scholarly journals Effects of Two Trichoderma Strains on Plant Growth, Rhizosphere Soil Nutrients, and Fungal Community of Pinus sylvestris var. mongolica Annual Seedlings

Forests ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 758 ◽  
Author(s):  
Saiyaremu Halifu ◽  
Xun Deng ◽  
Xiaoshuang Song ◽  
Ruiqing Song
Keyword(s):  
Enzyme Activity ◽  
Community Structure ◽  
Plant Growth ◽  
Soil Nutrients ◽  
Fungal Community ◽  
Rhizosphere Soil ◽  
Soil Nutrient ◽  
Nutrient Content ◽  
Root Structure ◽  
Soil Nutrient Content

Trichoderma spp. are proposed as major plant growth-promoting fungi that widely exist in the natural environment. These strains have the abilities of rapid growth and reproduction and efficient transformation of soil nutrients. Moreover, they can change the plant rhizosphere soil environment and promote plant growth. Pinus sylvestris var. mongolica has the characteristics of strong drought resistance and fast growth and plays an important role in ecological construction and environmental restoration. The effects on the growth of annual seedlings, root structure, rhizosphere soil nutrients, enzyme activity, and fungal community structure of P. sylvestris var. mongolica were studied after inoculation with Trichoderma harzianum E15 and Trichoderma virens ZT05, separately. The results showed that after inoculation with T. harzianum E15 and T. virens ZT05, seedling biomass, root structure index, soil nutrients, and soil enzyme activity were significantly increased compared with the control (p < 0.05). There were significant differences in the effects of T. harzianum E15 and T. virens ZT05 inoculation on the growth and rhizosphere soil nutrient of P. sylvestris var. mongolica (p < 0.05). For the E15 treatment, the seedling height, ground diameter, and total biomass of seedlings were higher than that those of the ZT05 treatment, and the rhizosphere soil nutrient content and enzyme activity of the ZT05 treatment were higher than that of the E15 treatment. The results of alpha and beta diversity analyses showed that the fungi community structure of rhizosphere soil was significantly different (p < 0.05) among the three treatments (inoculated with T. harzianum E15, T. virens ZT05, and not inoculated with Trichoderma). Overall, Trichoderma inoculation was correlated with the change of rhizosphere soil nutrient content.

scholarly journals Rice Root-Associated Diazotrophic Community Succession is Driven by Growth Period Combined With Fertilization

2020 ◽  
Author(s):  
Zhongli Cui ◽  
Xue Luo ◽  
Xianfeng Ye ◽  
Wenhui Wang ◽  
Yang Chen ◽  
...  
Keyword(s):  
Community Composition ◽  
Soil Nutrients ◽  
Rhizosphere Soil ◽  
Growth Period ◽  
Reproductive Stage ◽  
Vegetative Stage ◽  
Pig Manure ◽  
Community Structures ◽  
Relative Abundances ◽  
Diazotrophic Community

Abstract BackgroundBiological nitrogen fixation (BNF) and nitrogenous fertilizers are two crucial ways for nitrogen input in the rice paddy system. Little is known about the effect of nitrogenous fertilizers on root-associated diazotrophs. Here, we investigated the succession of total and active diazotrophs in rhizosphere soil and rice roots under four fertilization treatments (control, NPK, NPK + pig manure, and NPK + rice straw) during three key growth periods (tillering, heading and mature).ResultsThe 15N isotope dilution experiment verified that root-associated diazotrophs could supply N for rice under low nitrogen nutrition by BNF (%Ndfa=11.51). Niche differentiation of diazotrophs existed at the rhizosphere soil-root interface. At both DNA and RNA levels, growth period had stronger effects on the community composition of endophytic diazotrophs than rhizosphere diazotrophs. The Chao1 and Shannon indices of total endophytic diazotrophs dramatically increased at the vegetative stage, and underwent relatively minor changes at the reproductive stage. Furthermore, the community structures of total endophytic diazotrophs were more stabilized in the reproductive stage than the vegetative stage. The number of OTUs shared by rhizosphere soil and roots increased during rice growth. Compared with CK, NPK reduced the relative abundances of Pelobacter and increased the relative abundances of Azoarcus. Pig manure not only improved soil nutrients (OM, TN, TP, AN, AP and NO3-N), but reduced the effect of chemical fertilizers on the community composition of natural rhizosphere diazotrophs. ConclusionsGrowth period demonstrated a stronger influence on the root-associated diazotrophs than fertilization practices. The community structures of total endophytic diazotrophs were more stabilized in the reproductive stage than the vegetative stage, and the alpha-diversity indices and complex of network structures of endophytic diazotrophs increased at the vegetative stage. Replacing chemical fertilization with pig manure not only increased soil nutrients, but regulated rhizosphere diazotrophic community structures. Understanding the combined effects of growth period and fertilization on root-associated diazotrophs presents the basis towards the sustainable crop production.

scholarly journals Effects of Biogas Slurry on Fruit Economic Traits and Soil Nutrients of Camellia oleifera Abel

2018 ◽  
Author(s):  
Lu You ◽  
Shuqin Yu ◽  
Huiyun Liu ◽  
Chutian Wang ◽  
Zengliang Zhou ◽  
...  
Keyword(s):  
Organic Matter ◽  
Fatty Acid ◽  
Soil Nutrients ◽  
Acid Content ◽  
Rhizosphere Soil ◽  
Fatty Acid Content ◽  
Application Rate ◽  
Camellia Oleifera ◽  
Biogas Slurry ◽  
Economic Traits

AbstractSoil nutrients play a principal role in Camellia oleifera Abel (oil-seed camellia) production. Camellia oleifera absorbs nutrients from surrounding soils and its production is highly influenced by nutrients or fertilization. In this study, we investigated the effects of biogas slurry applications on soil nutrients and economic traits of C. oleifera fruits. Five different amounts of fertilizing biogas slurry (0, 10, 20, 30, or 40 kg/plant/year from three applications per year) were applied to C. oleifera plants in 2015 and 2016. Rhizosphere soil nutrients and C. oleifera fruit economic traits (yield, seed rate, and oil yield)were measured. Fertilization with biogas slurryincreasedsoil organic matter, available nitrogen (N), phosphorus (P), and potassium (K) in both 2015 and 2016. Increases in soil available N, P, and Kwere largest at the highest slurry application rate and second largest at the second highest application rate. Fruit economic traits were maximized at the two highest application rates. Oil yield was correlated withsoil available P in 2015 and 2016, and soil organic matter in 2015. Fertilization with biogas slurry decreased saturated fatty acid content in fruit but had no effect on unsaturated fatty acid content. In conclusion, fertilization with biogas slurry increases rhizosphere soil nutrients and fruit economic traits of C. oleifera with the rates of at least 30 kg/plant/year having the most positive effects.

Biochar can improve biological nitrogen fixation by altering the root growth strategy of soybean in Albic soil

2021 ◽  
Vol 773 ◽  
pp. 144564
Author(s):  
Liqun Xiu ◽  
Weiming Zhang ◽  
Di Wu ◽  
Yuanyuan Sun ◽  
Honggui Zhang ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Root Growth ◽  
Biological Nitrogen Fixation ◽  
Growth Strategy ◽  
Albic Soil ◽  
Biological Nitrogen
Sign in / Sign up

Export Citation Format

Share Document