Role of Host Plants on the Biological Aspects and Parasitism Levels of Eretmocerus mundus Mercet (Hymenoptera: Aphelinidae), a Parasitoid of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae)

2008 ◽  
Vol 5 (6) ◽  
pp. 356-368 ◽  
Author(s):  
Nagdy F. Abdel-Baky ◽  
M.A. Al-Deghair
Keyword(s):  
Bemisia Tabaci ◽  
Host Plants ◽  
Eretmocerus Mundus ◽  
Biological Aspects

Regional co-occurrence between distinct Bemisia tabaci species in Tunisia with new insights into the role of host plants

2014 ◽  
Vol 43 (2) ◽  
pp. 135-150 ◽  
Author(s):  
Asma Laarif ◽  
Dounia Saleh ◽  
Cécile Clouet ◽  
Nathalie Gauthier
Keyword(s):  
Bemisia Tabaci ◽  
Host Plants

Plant Resistance in Some Modern Soybean Varieties May Favor Population Growth and Modify the Stylet Penetration of Bemisia tabaci (Hemiptera: Aleyrodidae)

2021 ◽  
Author(s):  
Mauricélia F Almeida ◽  
Clébson S Tavares ◽  
Euires O Araújo ◽  
Marcelo C Picanço ◽  
Eugênio E Oliveira ◽  
...  
Keyword(s):  
Population Growth ◽  
Bemisia Tabaci ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Genetically Engineered ◽  
Population Increase ◽  
Net Reproductive Rate ◽  
Bt Toxin ◽  
Demographic Performance

Abstract Complaints of severe damage by whiteflies in soybean fields containing genetically engineered (GE) varieties led us to investigate the role of transgenic soybean varieties expressing resistance to some insects (Cry1Ac Bt toxin) and to herbicide (glyphosate) on the population growth and feeding behavior of Bemisia tabaci (Gennadius) MEAM1 (Hemiptera: Aleyrodidae). In the laboratory, the whiteflies reared on the GE Bt soybeans had a net reproductive rate (R0) 100% higher and intrinsic rate of population increase (rm) 15% higher than those reared on non-GE soybeans. The increased demographic performance was associated with a higher lifetime fecundity. In electrical penetration graphs, the whiteflies reared on the GE soybeans had fewer probes and spent 50% less time before reaching the phloem phase from the beginning of the first successful probe, indicating a higher risk of transmission of whitefly-borne viruses. Data from Neotropical fields showed a higher population density of B. tabaci on two soybean varieties expressing glyphosate resistance and Cry1Ac Bt toxin. These results indicate that some GE soybean varieties expressing insect and herbicide resistances can be more susceptible to whiteflies than non-GE ones or those only expressing herbicide resistance. Most likely, these differences are related to varietal features that increase host-plant susceptibility to whiteflies. Appropriate pest management may be needed to deal with whiteflies in soybean fields, especially in warm regions, and breeders may want to consider the issue when developing new soybean varieties.

scholarly journals MicroRNAs: Biological Regulators in Pathogen–Host Interactions

Cells ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 113 ◽  
Author(s):  
Stephanie Maia Acuña ◽  
Lucile Maria Floeter-Winter ◽  
Sandra Marcia Muxel
Keyword(s):  
Immune Response ◽  
Infectious Diseases ◽  
Small Rnas ◽  
Immune Cell ◽  
Fine Tuning ◽  
Biological Processes ◽  
Host Interactions ◽  
The Past ◽  
Biological Aspects

An inflammatory response is essential for combating invading pathogens. Several effector components, as well as immune cell populations, are involved in mounting an immune response, thereby destroying pathogenic organisms such as bacteria, fungi, viruses, and parasites. In the past decade, microRNAs (miRNAs), a group of noncoding small RNAs, have emerged as functionally significant regulatory molecules with the significant capability of fine-tuning biological processes. The important role of miRNAs in inflammation and immune responses is highlighted by studies in which the regulation of miRNAs in the host was shown to be related to infectious diseases and associated with the eradication or susceptibility of the infection. Here, we review the biological aspects of microRNAs, focusing on their roles as regulators of gene expression during pathogen–host interactions and their implications in the immune response against Leishmania, Trypanosoma, Toxoplasma, and Plasmodium infectious diseases.

scholarly journals Glycans in autophagy, endocytosis and lysosomal functions

2021 ◽  
Author(s):  
Fulvio Reggiori ◽  
Hans-Joachim Gabius ◽  
Massimo Aureli ◽  
Winfried Römer ◽  
Sandro Sonnino ◽  
...  
Keyword(s):  
Sugar Code ◽  
Endogenous Lectins ◽  
Biological Aspects ◽  
Molecular Signals ◽  
Lysosomal Proteins ◽  
In Cells

AbstractGlycans have been shown to function as versatile molecular signals in cells. This prompted us to look at their roles in endocytosis, endolysosomal system and autophagy. We start by introducing the cell biological aspects of these pathways, the concept of the sugar code, and provide an overview on the role of glycans in the targeting of lysosomal proteins and in lysosomal functions. Moreover, we review evidence on the regulation of endocytosis and autophagy by glycans. Finally, we discuss the emerging concept that cytosolic exposure of luminal glycans, and their detection by endogenous lectins, provides a mechanism for the surveillance of the integrity of the endolysosomal compartments, and serves their eventual repair or disposal.

scholarly journals From the Individual's Fault to the Construct of Power (Development and Changes of Crime Theories)

2014 ◽  
Vol 27 ◽  
pp. 96-107
Author(s):  
Mohamad Seddigh Mohamadi ◽  
Hasan Babaee ◽  
Mohamad Khaledian
Keyword(s):  
Social Factors ◽  
Focal Point ◽  
Power Development ◽  
Theoretical Approaches ◽  
Critical Theories ◽  
Language And Power ◽  
The People ◽  
The Social ◽  
Biological Aspects

The present paper aims to explain crime by investigating various theoretical approaches and to show that from the classic era to the recent postmodern theories, a slow but steady cycle of discourse concerning crime has been occurring. In the classic times, the criminal is assumed to be a sane person with sound will who commits crime with an individualistic choice and due to incorrect decisions; In the positivism approach, the theorists' concern is directed at recognizing criminals and clarifying more fundamental biological aspects and psychological performance and they seek to explain the phenomenon of crime by dividing the people of the society into normal and abnormal people; In the modern theories the social factors causing the appearance of crime are at the focal point while critical theories greatly emphasize on the role of the society in the criminal phenomenon and its definition, finally postmodern theories consider crime totally as constructed by mindset, language and power and question its existential reality.

scholarly journals Two Deoxythymidine Triphosphate Synthesis-Related Genes Regulate Obligate Symbiont Density and Reproduction in the Whitefly Bemisia tabaci MED

2021 ◽  
Vol 11 ◽  
Author(s):  
Zezhong Yang ◽  
Cheng Gong ◽  
Yuan Hu ◽  
Jie Zhong ◽  
Jixing Xia ◽  
...  
Keyword(s):  
Amino Acid ◽  
Rna Interference ◽  
Bemisia Tabaci ◽  
Essential Amino Acid ◽  
Cellular Growth ◽  
Capacity Analysis ◽  
Host Insect ◽  
Obligate Symbiont ◽  
Pyrimidine Pathway

Deoxythymidine triphosphate (dTTP) is essential for DNA synthesis and cellular growth in all organisms. Here, genetic capacity analysis of the pyrimidine pathway in insects and their symbionts revealed that dTTP is a kind of metabolic input in several host insect/obligate symbiont symbiosis systems, including Bemisia tabaci MED/Candidatus Portiera aleyrodidarum (hereafter Portiera). As such, the roles of dTTP on both sides of the symbiosis system were investigated in B. tabaci MED/Portiera. Dietary RNA interference (RNAi) showed that suppressing dTTP production significantly reduced the density of Portiera, significantly repressed the expression levels of horizontally transferred essential amino acid (EAA) synthesis-related genes, and significantly decreased the reproduction of B. tabaci MED adults as well as the hatchability of their offspring. Our results revealed the regulatory role of dTTP in B. tabaci MED/Portiera and showed that dTTP synthesis-related genes could be potential targets for controlling B. tabaci as well as other sucking pests.

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