Occurrence of the anamorphic stage of Ophiocordyceps myrmicarum on a non-Formicidae insect in integrated crop-livestock farming systems

Torres, F. Z. V.; Souza, Daniela Aguiar; Lira, E. da C.; Faria, Marcos; Sujii, Edison Ryoiti; Lopes, Rogério Biaggioni

doi:10.1016/j.funeco.2018.05.009

Cited by 1 publication

(1 citation statement)

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“…It is well known that continuous cropping can decline soil quality, which seriously decreases the quantity and quality of crop products. Previous studies have shown that continuous cropping has led to several problems in soils, for example, deficiencies in soil nutrition (Ashworth et al, 2018), decreases in soil enzyme activity (Chavarría et al, 2016), increases in the autotoxicity of root exudates (Huang et al, 2013), increases in pests and diseases (Torres et al, 2018) and imbalances in soil microbial communities (Bennett et al, 2012). Although the problems caused by continuous cropping of corn is less harmful than that of continuous cropping of soybean (Xu, Li & Li, 2004), several studies have revealed that continuous cropping of corn has caused the lodging and surge of pests, which have damaged corn yield (Jirak-Peterson & Esker, 2011;Liang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Changes of diazotrophic communities in response to cropping systems in a Mollisol of Northeast China

Zou

Yao

Liu

et al. 2020

PeerJ

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Nitrogen-fixing microorganisms play important roles in N cycling. However, knowledge related to the changes in the diazotrophic community in response to cropping systems is still rudimentary. In this study, the nifH gene was used to reveal the abundance and community compositions of diazotrophs in the cropping systems of continuous cropping of corn (CC) and soybean (SS) and soybean-corn rotation for growing corn (CSC) and soybean (SCS) in a black soil of Northeast China. The results showed that the abundance of the nifH gene was significantly higher in cropping soybean than in cropping corn under the same cropping system, while remarkably increased in the rotation system under the same crop. The Shannon index in the CC treatment was significantly higher than that in the other treatments, but the OTU number and Chao1 index had no significant change among the four treatments. Bradyrhizobium japonicum was the dominant diazotrophic species, and its relative abundance was at the lowest value in the CC treatment. In contrast, Skermanella sp. had the highest relative abundance in the CC treatment. A PCoA showed that the diazotrophic communities were separated between different cropping systems, and the variation caused by continuous corn cropping was the largest. Among the tested soil properties, the soil available phosphorus was a primary factor in determining diazotrophic community compositions. Overall, the findings of this study highlighted that the diazotrophic communities in black soils are very sensitive to cropping systems.

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