Obstacles in continuous cropping: Mechanisms and control measures

Ma, Zhikun; Guan, Zhengjun; Liu, Qingchang; Hu, Yaya; Liu, Lanfu; Wang, Baoqing; Huang, Lifei; Li, Huifeng; Yang, Yibo; Han, Mingjie; Gao, Zhiyuan; Saleem, Muhammad

doi:10.1016/bs.agron.2023.01.004

Cited by 23 publications

(25 citation statements)

References 183 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rhizosphere microbial community respond to these plantderived metabolites, which in turn feedback on the soil and plant properties 25,38 . Continuous cropping is well known to alter the soil microbial community 5,20,42 , which was also found in our study (Figs. 3 and 4).…”

Section: Discussionsupporting

confidence: 88%

“…This may be the result of tobacco roots adapting to changing soil environments 24 . Several secondary metabolites were found in the root exudate, such as phenolic acids, alkaloids, terpenes and ketones, which have been recognized as the major autotoxins for many plants 5 . The most abundant compound in our tobacco root exudate were phenolic acids.…”

Section: Discussionmentioning

confidence: 99%

“…Some of the root exudates are signal chemicals, which recruit certain microbial taxa while repel the others 25 . More importantly, rhizosphere microorganisms decompose the autotoxins to directly mitigate the damage of continuous cropping 5 . Accumulation of benefit microorganisms by root exudate is thought to be an important way to spontaneously overcome the soil sickness in field 5 .…”

mentioning

confidence: 99%

“…More importantly, rhizosphere microorganisms decompose the autotoxins to directly mitigate the damage of continuous cropping 5 . Accumulation of benefit microorganisms by root exudate is thought to be an important way to spontaneously overcome the soil sickness in field 5 . However, the relationship between root exudates and rhizosphere microorganisms of tobacco is little known.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Root exudates and rhizosphere microbiota in responding to long-term continuous cropping of tobacco

Li,

Jin,

Zhang

et al. 2024

Sci Rep

View full text Add to dashboard Cite

Soil sickness a severe problem in tobacco production, leading to soil-borne diseases and reduce in tobacco yield. This occurs as a result of the interaction between root exudates and rhizosphere microorganisms, which is however, little studied until now. By combining the field investigation and pot experiment, we found the output yield consistently decreased during the first 10 years of continuous cropping in a tobacco field, but increased at the 15th year (15Y). The root exudate and rhizosphere bacterial community was further analyzed to reveal the underlying mechanism of the suppressive soil formation. Root exudate of 15Y tobacco enriched in amino acids and derivatives, while depleted in the typical autotoxins including phenolic acids and alkaloids. This was correlated to the low microbial diversity in 15Y, but also the changes in community composition and topological properties of the co-occurrence network. Especially, the reduced autotoxins were associated with low Actinobacteria abundance, low network complexity and high network modularity, which significantly correlated with the recovered output yield in 15Y. This study revealed the coevolution of rhizosphere microbiota and root exudate as the soil domesticated by continuous cropping of tobacco, and indicated a potential role of the autotoxins and theirs effect on the microbial community in the formation of suppressive soil.

show abstract

Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Root exudates and rhizosphere microbiota in responding to long-term continuous cropping of tobacco

Li,

Jin,

Zhang

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Diverse crop rotations comprise an important facet of sustainable, resilient production systems aiding in disease suppression, nutrient cycling and risk mitigation [ 3 ]. While the importance of crop rotation for reducing pathogen host-crop incidence is acknowledged [ 4 ] less is known about the indirect impacts of canola frequency on the broader soil and plant microbiome and how this subsequently affects soil nutrient cycling and uptake. Compared to monoculture, diverse rotations have higher levels of nutrient cycling [ 5 ], increases in bioavailable nitrogen, soil organic matter, and available potassium [ 6 ], and appear to have broader soil microbial metabolic capabilities, perhaps owing to a greater diversity of residue input types [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Crop rotation significantly influences the composition of soil, rhizosphere, and root microbiota in canola (Brassica napus L.)

Town

Dumonceaux

Tidemann

et al. 2023

Environmental Microbiome

View full text Add to dashboard Cite

Background Crop rotation is an agronomic practice that is known to enhance productivity and yield, and decrease pest and disease pressure. Economic and other factors have increased the frequency of certain crops, including canola, with unknown effects on the below ground microbial communities that impact plant health and performance. This study investigated the effect of 12 years of crop rotation including canola-wheat; canola-pea-barley; and unrotated canola across three geographic sites in Western Canada with diverse soil types and environmental conditions. To provide data on mature, established crop rotation strategies, root exudate profiles, soil nutrient fluxes, and bacterial and fungal microbial community profiles were determined at the flowering stage in the final two (canola) years of the 12-year rotations. Results After 12 years of rotation, nutrient fluxes were affected in the soil in an inconsistent manner, with K, NO3, Mg, Ca, P, and Fe fluxes variably impacted by rotation depending on the year and site of sampling. As expected, rotation positively influenced yield and oil content, and decreased disease pressure from Leptosphaeria and Alternaria. In two of the three sites, root exudate profiles were significantly influenced by crop rotation. Bacterial soil, root, and rhizosphere communities were less impacted by crop rotation than the fungal communities. Fungal sequences that were associated with specific rotation strategies were identified in the bulk soil, and included known fungal pathogens in the canola-only strategy. Two closely related fungal sequences identified as Olpidium brassicae were extremely abundant at all sites in both years. One of these sequences was observed uniquely at a single site and was significantly associated with monocropped canola; moreover, its abundance correlated negatively with yield in both years. Conclusions Long-term canola monoculture affected root exudate profiles and soil nutrient fluxes differently in the three geographic locations. Bacterial communities were less impacted by rotation compared to the fungal communities, which consistently exhibited changes in composition in all ecological niches at all sites, in both years. Fungal sequences identified as O. brassicae were highly abundant at all sites, one of which was strongly associated with canola monoculture. Soil management decisions should include consideration of the effects on the microbial ecosystems associated with the plants in order to inform best management practices.

show abstract

Enhancing tomato disease resistance through endogenous antifungal proteins and introduced nematode‐targeting dsRNA of biocontrol agent Bacillus velezensisHS‐3

Han,

Zhu,

Liu

et al. 2024

Pest Management Science

View full text Add to dashboard Cite

BACKGROUNDAs a type of biological control agents (BCAs), Bacillus velezensis possesses the efficacy of inhibiting pathogenic microorganisms, promoting plant growth, and overcoming continuous cropping obstacles (CCOs). However, there is limited reporting on the optimization of the cultivation conditions for such biocontrol agents and their role as dsRNA delivery vectors.RESULTSIn this study, a B. velezensis strain HS‐3 was isolated from the root zone of tomato plants with in vitro anti‐Botrytis cinerea activity. The investigation into active compounds revealed that HS‐3 predominantly employs proteins with molecular weights greater than 3 kDa for its antifungal activity. LC–MS/MS analysis identified various proteases and chitosanase, further suggesting that HS‐3 most likely employs these enzymes to degrade fungal cell walls for its antifungal effect. To optimize the production of extracellular proteins, fermentation parameters for HS‐3 were systematically optimized, leading to an optimized medium (OP‐M). HS‐3 cultured in OP‐M demonstrated enhanced capacity to assist tomato plants in withstanding CCO. However, the presence of excessive nematodes in diseased soil resulted in disease severity index (DSI) remaining high. An RNA interference mechanism was further introduced to HS‐3, targeting the nematode tyrosine phosphatase (TP) gene. Ultimately, HS‐3 expressing dsRNA of TP in OP‐M effectively assisted tomatoes in mitigating CCO, reducing DSI to 2.2% and 17.8% of the control after 45 and 90 days of growth, respectively.CONCLUSIONThe advantages of Bacillus velezensis in crop disease management and the mitigation of CCOs become even more pronounced when utilizing both optimized levels of endogenous enzymes and introduced nematode‐targeting dsRNA.

show abstract

Obstacles in continuous cropping: Mechanisms and control measures

Cited by 23 publications

References 183 publications

Root exudates and rhizosphere microbiota in responding to long-term continuous cropping of tobacco

Root exudates and rhizosphere microbiota in responding to long-term continuous cropping of tobacco

Crop rotation significantly influences the composition of soil, rhizosphere, and root microbiota in canola (Brassica napus L.)

Enhancing tomato disease resistance through endogenous antifungal proteins and introduced nematode‐targeting dsRNA of biocontrol agent Bacillus velezensisHS‐3

Contact Info

Product

Resources

About