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Author Osnat Malka

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Glucosylation prevents plant defense activation in phloem-feeding insects.

Osnat Malka, Michael L A E Easson, Christian Paetz, Monika Götz, Michael Reichelt, Beate Stein, Katrin Luck, Aleksa Stanišić, Ksenia Juravel, Diego Santos-Garcia, Lilach L Mondaca, Simon Springate, John Colvin, Stephan Winter, Jonathan Gershenzon, Shai Morin, Daniel G Vassão,

The metabolic adaptations by which phloem-feeding insects counteract plant defense compounds are poorly known. Two-component plant defenses, such as glucosinolates, consist of a glucosylated protoxin that is activated by a glycoside hydrolase upon plant damage. Phloem-feeding herbivores are not generally believed to be negatively impacted by two-component defenses due to ... Read more >>

Nat Chem Biol (Nature chemical biology)
[2020, :]

Cited: 0 times

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Molecular Evolution of the Glutathione S-Transferase Family in the Bemisia tabaci Species Complex.

Ofer Aidlin Harari, Diego Santos-Garcia, Mirit Musseri, Pnina Moshitzky, Mitulkumar Patel, Paul Visendi, Susan Seal, Rotem Sertchook, Osnat Malka, Shai Morin,

The glutathione S-transferase (GST) family plays an important role in the adaptation of herbivorous insects to new host plants and other environmental constrains. The family codes for enzymes that neutralize reactive oxygen species and phytotoxins through the conjugation of reduced glutathione. Here, we studied the molecular evolution of the GST ... Read more >>

Genome Biol Evol (Genome biology and evolution)
[2020, 12(2):3857-3872]

Cited: 0 times

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A Transmissible RNA Pathway in Honey Bees.

Eyal Maori, Yael Garbian, Vered Kunik, Rita Mozes-Koch, Osnat Malka, Haim Kalev, Niv Sabath, Ilan Sela, Sharoni Shafir,

Systemic RNAi, initiated by double-stranded RNA (dsRNA) ingestion, has been reported in diverse invertebrates, including honey bees, demonstrating environmental RNA uptake that undermines homologous gene expression. However, the question why any organism would take up RNA from the environment has remained largely unanswered. Here, we report on horizontal RNA flow ... Read more >>

Cell Rep (Cell reports)
[2019, 27(7):1949-1959.e6]

Cited: 6 times

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A transmissible RNA pathway in honey bees

Eyal Maori, Yael Garbian, Vered Kunik, Rita Mozes-Koch, Osnat Malka, Haim Kalev, Niv Sabath, Ilan Sela, Sharoni Shafir,

ABSTRACT One of the characteristics of RNA interference (RNAi) is systemic spread of the silencing signal among cells and tissues throughout the organism. Systemic RNAi, initiated by double-stranded RNA (dsRNA) ingestion, has been reported in diverse invertebrates, including honey bees, demonstrating environmental RNA uptake that undermines homologous gene expression. However, ... Read more >>

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Species-complex diversification and host-plant associations in Bemisia tabaci: A plant-defence, detoxification perspective revealed by RNA-Seq analyses.

Osnat Malka, Diego Santos-Garcia, Ester Feldmesser, Elad Sharon, Renate Krause-Sakate, Hélène Delatte, Sharon van Brunschot, Mitulkumar Patel, Paul Visendi, Habibu Mugerwa, Susan Seal, John Colvin, Shai Morin,

Insect-plant associations and their role in diversification are mostly studied in specialists. Here, we aimed to identify macroevolution patterns in the relationships between generalists and their host plants that have the potential to promote diversification. We focused on the Bemisia tabaci species complex containing more than 35 cryptic species. Mechanisms ... Read more >>

Mol Ecol (Molecular ecology)
[2018, 27(21):4241-4256]

Cited: 3 times

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Targeting detoxification genes by phloem-mediated RNAi: A new approach for controlling phloem-feeding insect pests.

Galit Eakteiman, Rita Moses-Koch, Pnina Moshitzky, Natividad Mestre-Rincon, Daniel G Vassão, Katrin Luck, Rotem Sertchook, Osnat Malka, Shai Morin,

Many phloem-feeding insects are considered severe pests of agriculture and are controlled mainly by chemical insecticides. Continued extensive use of these inputs is environmentally undesirable, and also leads to the development of insecticide resistance. Here, we used a plant-mediated RNA interference (RNAi) approach, to develop a new control strategy for ... Read more >>

Insect Biochem. Mol. Biol. (Insect biochemistry and molecular biology)
[2018, 100:10-21]

Cited: 2 times

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Glucosinolate Desulfation by the Phloem-Feeding Insect Bemisia tabaci.

Osnat Malka, Anton Shekhov, Michael Reichelt, Jonathan Gershenzon, Daniel Giddings Vassão, Shai Morin,

Glucosinolates are plant secondary defense metabolites confined nearly exclusively to the order Brassicales. Upon tissue rupture, glucosinolates are hydrolyzed to various bioactive breakdown products by the endogenous plant enzyme myrosinase. As the feeding of chewing insect herbivores is associated with plant tissue damage, these insects have developed several independent strategies ... Read more >>

J. Chem. Ecol. (Journal of chemical ecology)
[2016, 42(3):230-235]

Cited: 7 times

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Genomic analysis of the interactions between social environment and social communication systems in honey bees (Apis mellifera).

Osnat Malka, Elina L Niño, Christina M Grozinger, Abraham Hefetz,

Social context is often a primary regulator of social behavior, but genes that affect or are affected by social context have rarely been investigated. In social insects, caste specific pheromones are key modulators of social behavior, e.g., in honey bees the queen mandibular gland (MG) pheromone mediates reproductive dominance, its ... Read more >>

Insect Biochem. Mol. Biol. (Insect biochemistry and molecular biology)
[2014, 47:36-45]

Cited: 9 times

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Activation of the Phenylpropanoid pathway in Nicotiana tabacum improves the performance of the whitefly Bemisia tabaci via reduced jasmonate signaling.

Michal Alon, Osnat Malka, Galit Eakteiman, Moshe Elbaz, Michal Moyal Ben Zvi, Alexander Vainstein, Shai Morin,

BACKGROUND: Phloem-feeding insects can manipulate plant-induced resistance and are able to suppress effective jasmonic acid/ethylene (JA/ET) defenses by the induction of inefficient salicylic acid (SA) based responses. As a result, activation of the phenylpropanoid biosynthesis pathway in transgenic plants is anticipated to cause complex interactions between phloem-feeding insects and their ... Read more >>

PLoS ONE (PloS one)
[2013, 8(10):e76619]

Cited: 9 times

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Chemical profiles of two pheromone glands are differentially regulated by distinct mating factors in honey bee queens (Apis mellifera L.).

Elina L Niño, Osnat Malka, Abraham Hefetz, David R Tarpy, Christina M Grozinger,

Pheromones mediate social interactions among individuals in a wide variety of species, from yeast to mammals. In social insects such as honey bees, pheromone communication systems can be extraordinarily complex and serve to coordinate behaviors among many individuals. One of the primary mediators of social behavior and organization in honey ... Read more >>

PLoS One (PloS one)
[2013, 8(11):e78637]

Cited: 11 times

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Exploring the role of juvenile hormone and vitellogenin in reproduction and social behavior in bumble bees.

Etya Amsalem, Osnat Malka, Christina Grozinger, Abraham Hefetz,

BACKGROUND: The genetic and physiological pathways regulating behavior in solitary species are hypothesized to have been co-opted to regulate social behavior in social species. One classic example is the interaction between vitellogenin (an egg-yolk and storage protein) and juvenile hormone, which are positively correlated in most insect species but have ... Read more >>

BMC Evol. Biol. (BMC evolutionary biology)
[2014, 14(1):45]

Cited: 22 times

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Virgin honeybee queens fail to suppress worker fertility but not fertility signalling.

Margarita Orlova, Osnat Malka, Abraham Hefetz,

Queen mating status in social insects is a matter of crucial importance for workers because of its influence on the queen's productivity and consequently their fitness. Behavioural and physiological reactions of workers to the queens mating status have been studied as a proxy to mechanisms maintaining insect sociality. Here we ... Read more >>

J. Insect Physiol. (Journal of insect physiology)
[2013, 59(3):311-317]

Cited: 1 time

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Effects of honey bee (Apis mellifera L.) queen insemination volume on worker behavior and physiology.

Elina L Niño, Osnat Malka, Abraham Hefetz, Peter Teal, Jerry Hayes, Christina M Grozinger,

Honey bee colonies consist of tens of thousands of workers and a single reproductive queen that produces a pheromone blend which maintains colony organization. Previous studies indicated that the insemination quantity and volume alter queen mandibular pheromone profiles. In our 11-month long field study we show that workers are more ... Read more >>

J. Insect Physiol. (Journal of insect physiology)
[2012, 58(8):1082-1089]

Cited: 9 times

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The role of tyramine and octopamine in the regulation of reproduction in queenless worker honeybees.

Mor Salomon, Osnat Malka, Robert K Vander Meer, Abraham Hefetz,

In honeybees, workers under queenless condition compete for reproduction and establish reproductive dominance hierarchy. Ovary activation is generally accompanied by the expression of queen-like pheromones. Biogenic amines (BAs), in particular dopamine, are believed to be involved in this process by regulating ovarian development. However, the role of BAs in establishing ... Read more >>

Naturwissenschaften (Die Naturwissenschaften)
[2012, 99(2):123-131]

Cited: 2 times

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Uncoupling fertility from fertility-associated pheromones in worker honeybees (Apis mellifera).

Osnat Malka, Tamar Katzav-Gozansky, Abraham Hefetz,

Fertility-associated pheromones, chemical signals delineating ovarian development, were favourably selected in the course of evolution because it is in the best interest of both the signallers (in recruiting help from other colony members) and the receivers (in assisting them to reach an informed decision of how to maximize fitness). Such ... Read more >>

J. Insect Physiol. (Journal of insect physiology)
[2009, 55(3):205-209]

Cited: 7 times

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The gene road to royalty--differential expression of hydroxylating genes in the mandibular glands of the honeybee.

Osnat Malka, Iris Karunker, Adva Yeheskel, Shai Morin, Abraham Hefetz,

The advances in honeybee sociogenomics have paved the way for the study of social communication processes at the gene level, in particular the expression of caste-specific pheromones. The queen honeybee mandibular pheromone provides an excellent model system, in that biosynthesis of the hydroxylating fatty acid caste-specific pheromone appears to be ... Read more >>

FEBS J. (The FEBS journal)
[2009, 276(19):5481-5490]

Cited: 9 times

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The binding of fibrin sealant to collagen is influenced by the method of purification and the cross-linked fibrinogen-fibronectin (heteronectin) content of the 'fibrinogen' component.

Lilliana Bar, Osnat Malka, Elvira Naboichenko, Israel Nur,

Two fibrinogen preparations, each an intermediate in the manufacture of the 'fibrinogen' component of a commercial human tissue sealant, were made from a common cryoprecipitate source. The first preparation, prepared according to the process described by Schwartz et al. had a higher ratio of clottable to total protein than the ... Read more >>

Blood Coagul. Fibrinolysis (Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis)
[2005, 16(2):111-117]

Cited: 4 times

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