A salivary protein of the whitefly,Bemisia tabaci, affects its phloem-feeding on host plants

2016 ◽  
Author(s):  
Hong-Xing Xu
Keyword(s):  
Bemisia Tabaci ◽  
Host Plants ◽  
Salivary Protein ◽  
Phloem Feeding

scholarly journals A salivary effector enables whitefly to feed on host plants by eliciting salicylic acid-signaling pathway

2018 ◽  
Vol 116 (2) ◽  
pp. 490-495 ◽  
Author(s):  
Hong-Xing Xu ◽  
Li-Xin Qian ◽  
Xing-Wei Wang ◽  
Ruo-Xuan Shao ◽  
Yue Hong ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Signaling Pathway ◽  
Host Plants ◽  
Salivary Protein ◽  
In Planta ◽  
Protein Protein Interaction ◽  
Salicylic Acid Signaling ◽  
Homeobox Transcription Factor ◽  
Phloem Feeding ◽  
Sa Signaling

Phloem-feeding insects feed on plant phloem using their stylets. While ingesting phloem sap, these insects secrete saliva to circumvent plant defenses. Previous studies have shown that, to facilitate their feeding, many phloem-feeding insects can elicit the salicylic acid- (SA-) signaling pathway and thus suppress effective jasmonic acid defenses. However, the molecular basis for the regulation of the plant's defense by phloem-feeding insects remains largely unknown. Here, we show that Bt56, a whitefly-secreted low molecular weight salivary protein, is highly expressed in the whitefly primary salivary gland and is delivered into host plants during feeding. Overexpression of the Bt56 gene in planta promotes susceptibility of tobacco to the whitefly and elicits the SA-signaling pathway. In contrast, silencing the whitefly Bt56 gene significantly decreases whitefly performance on host plants and interrupts whitefly phloem feeding with whiteflies losing the ability to activate the SA pathway. Protein-protein interaction assays show that the Bt56 protein directly interacts with a tobacco KNOTTED 1-like homeobox transcription factor that decreases whitefly performance and suppresses whitefly-induced SA accumulation. The Bt56 orthologous genes are highly conserved but differentially expressed in different species of whiteflies. In conclusion, Bt56 is a key salivary effector that promotes whitefly performance by eliciting salicylic acid-signaling pathway.

scholarly journals Suppression of Plant Defenses by a Myzus persicae (Green Peach Aphid) Salivary Effector Protein

2014 ◽  
Vol 27 (7) ◽  
pp. 747-756 ◽  
Author(s):  
Dezi A. Elzinga ◽  
Martin De Vos ◽  
Georg Jander
Keyword(s):  
Myzus Persicae ◽  
Host Plants ◽  
Green Peach Aphid ◽  
Salivary Protein ◽  
Aphid Species ◽  
Salivary Proteins ◽  
Buchnera Aphidicola ◽  
Complex Interactions ◽  
Species Specific ◽  
Phloem Feeding

The complex interactions between aphids and their host plant are species-specific and involve multiple layers of recognition and defense. Aphid salivary proteins, which are released into the plant during phloem feeding, are a likely mediator of these interactions. In an approach to identify aphid effectors that facilitate feeding from host plants, eleven Myzus persicae (green peach aphid) salivary proteins and the GroEL protein of Buchnera aphidicola, a bacterial endosymbiont of this aphid species, were expressed transiently in Nicotiana tabacum (tobacco). Whereas two salivary proteins increased aphid reproduction, expression of three other aphid proteins and GroEL significantly decreased aphid reproduction on N. tabacum. These effects were recapitulated in stable transgenic Arabidopsis thaliana plants. Further experiments with A. thaliana expressing Mp55, a salivary protein that increased aphid reproduction, showed lower accumulation of 4-methoxyindol-3-ylmethylglucosinolate, callose and hydrogen peroxide in response to aphid feeding. Mp55-expressing plants also were more attractive for aphids in choice assays. Silencing Mp55 gene expression in M. persicae using RNA interference approaches reduced aphid reproduction on N. tabacum, A. thaliana, and N. benthamiana. Together, these results demonstrate a role for Mp55, a protein with as-yet-unknown molecular function, in the interaction of M. persicae with its host plants.

Whitefly, Bemisia tabaci (Gennadius) as influenced by host plants in Haryana

2018 ◽  
Vol 80 (2) ◽  
pp. 257
Author(s):  
S.C. Kedar ◽  
R.K. Saini ◽  
K.M. Kumaranag
Keyword(s):  
Bemisia Tabaci ◽  
Host Plants

The integrated use of chemical insecticides and the entomopathogenic nematode, Steinernema feltiae, for the control of sweetpotato whitefly, Bemisia tabaci

Nematology ◽  
2003 ◽  
Vol 5 (5) ◽  
pp. 713-720 ◽  
Author(s):  
Andrew Cuthbertson ◽  
Justine Head ◽  
Keith Walters ◽  
Alistair Murray
Keyword(s):  
Bemisia Tabaci ◽  
Host Plants ◽  
Galleria Mellonella ◽  
Entomopathogenic Nematode ◽  
Steinernema Feltiae ◽  
Sweetpotato Whitefly ◽  
Chemical Agents ◽  
Direct Exposure ◽  
Systemic Pesticide ◽  
The Impact

AbstractThe integration of infective juveniles of the entomopathogenic nematode, Steinernema feltiae, with chemical insecticides to control second instar stages of the sweetpotato whitefly, Bemisia tabaci, was investigated. The effects of direct exposure for 24 h to field rate dilutions of four insecticides (imidacloprid, buprofezin, teflubenzuron and nicotine) on nematode infectivity to Galleria mellonella larvae were tested in a sand tube bioassay. Teflubenzuron had the least adverse effect on the nematodes whilst imidacloprid, buprofezin and nicotine significantly reduced nematode infectivity. The impact of dry insecticide residue present on tomato and verbena foliage on nematode infectivity against B. tabaci larvae was investigated for buprofezin, teflubenzuron and nicotine (imidacloprid is a systemic pesticide and no residues would occur on foliage). No significant reduction on the level of control of B. tabaci was recorded when compared with the infectivity of nematodes applied to residue-free foliage of either tomato or verbena plants. Nematodes in combination with imidacloprid gave significantly higher B. tabaci larvae mortality compared to either treatment individually on both host plants. The integration of S. feltiae and these chemical agents into an integrated pest management programme for the control of B. tabaci is discussed.

Phloem-feeding whiteflies can fool their host plants, but not their parasitoids

2013 ◽  
Vol 27 (6) ◽  
pp. 1304-1312 ◽  
Author(s):  
Peng-Jun Zhang ◽  
Cai-Xia Xu ◽  
Jin-Ming Zhang ◽  
Yao-Bin Lu ◽  
Jia-Ning Wei ◽  
...  
Keyword(s):  
Host Plants ◽  
Phloem Feeding

scholarly journals KISARAN INANG DAN DINAMIKA POPULASI Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) DI PERTANAMAN CABAI MERAH

2011 ◽  
Vol 11 (1) ◽  
pp. 47-56
Author(s):  
Hendrival Hendrival ◽  
Purnama Hidayat ◽  
Ali Nurmansyah
Keyword(s):  
Host Range ◽  
Host Plant ◽  
Plant Species ◽  
Bemisia Tabaci ◽  
Population Dynamic ◽  
Natural Enemy ◽  
Host Plants ◽  
Chili Pepper ◽  
Plant Families ◽  
Abundant Population

The study of host range and population dynamic of B. tabaci in red chili pepper fiel dswas conducted in Sub-district of Pakem, District of Sleman, Province of Daerah Istimewa Yogyakarta during dry season of May-October 2009. The study of host plants of B. tabaci from the red chili pepper fields revealed that there were 27 species of host plants belong to 22 genera of 13 families including crops and weeds. The host plants belong to families of Araceae, Amaranthaceae, Asteraceae, Brassicaceae, Capparidaceae, Convolvulaceae, Euphorbiaceae, Lamiaceae, Oxalidaceae, Papilionaceae, Rubiaceae, Solanaceae and Sterculiaceae. The host plant families of Asteraceae and Euphorbiaceae had the most abundant population of B. tabaci. Geminivirus-like symptoms were found in the weeds of A. conyzoides and A. boehmerioides. Population of B. tabaci adults correlated with abundance of host plant species found in the red chili pepper fields. The population of B. tabaci in red chili pepper fields was affected by natural enemy population. Population dynamic of the parasitoid Eretmocerus sp. correlated with population dynamic of the parasitized nymph of B. tabaci. Parasitoid Eretmocerus sp. was potentially good in controlling population of B. tabaci nymph in red chili pepper fields.

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