| effect of the postfeeding interval on olfactory responses of thrips to herbivore-induced cotton plants. | we investigated the responses of 3 thrips species, frankliniella schultzei trybom, f. occidentalis pergrande, and thrips tabaci lindeman (thysanoptera: thripidae) to herbivore-damaged and undamaged cotton seedlings (gossypium hirsutum l. [malvales: malvaceae]) at a range of time intervals following damage by adult tetranychus urticae (koch), adult t. ludeni (zacher) (acari: tetranychidae) or helicoverpa armigera (hübner) (lepidoptera: noctuidae) larvae in olfactometer assays. the intensity/frequ ... | 2016 | 26172119 |
| dynamic transcriptome analysis and volatile profiling of gossypium hirsutum in response to the cotton bollworm helicoverpa armigera. | in response to insect herbivory, plants emit elevated levels of volatile organic compounds for direct and indirect resistance. however, little is known about the molecular and genomic basis of defense response that insect herbivory trigger in cotton plants and how defense mechanisms are orchestrated in the context of other biological processes. here we monitored the transcriptome changes and volatile characteristics of cotton plants in response to cotton bollworm (cbw; helicoverpa armigera) larv ... | 2015 | 26148847 |
| ghdrin1, a novel drought-induced gene of upland cotton (gossypium hirsutum l.) confers abiotic and biotic stress tolerance in transgenic tobacco. | a novel stress tolerance cdna fragment encoding ghdrin1 protein was identified and its regulation was studied in cotton boll tissues and seedlings subjected to various biotic and abiotic stresses. phylogenetic and conserved domain prediction indicated that ghdrin1 was annotated with a hypothetical protein of unknown function. subcellular localization showed that ghdrin1 is localized in the chloroplasts. the promoter sequence was isolated and subjected to in silico study. various cis-acting eleme ... | 2015 | 25413882 |
| variation in resistance to pyrethroids in helicoverpa armigera from benin republic, west africa. | pyrethroid resistance in helicoverpa armigera (hübner) field populations was investigated in benin over several years by using third- and fourth-instar larval topicalbioassays. h. armigera was resistant to pyrethroids tested as cypermethrin, deltamethrin, bifenthrin, and fenvalerate. pretreatment with piperonyl butoxide significantly decreased the ld50 value of cypermethrin and deltamethrin, and the resistance suppression by this synergist effect was observed. no significant decrease in the ld50 ... | 2009 | 19886459 |
| oviposition deterrents in larval frass of the cotton boll worm, helicoverpa armigera (lepidoptera: noctuidae): chemical identification and electroantennography analysis. | oviposition deterrents in the frass of cotton bollworm (cbw), helicoverpa armigera larvae fed on an artificial diet (fa) and on cotton gossypium hirsutum leaves (fc) were investigated by behavioral bioassays and electroantennography analyses in the laboratory. it was found that a water suspension or a hexane extract of the frass fa or fc, in contrast to the corresponding foods, significantly deterred oviposition of conspecifics. when hexane extracts of the frass fa and fc were further partitione ... | 2006 | 16388821 |
| genome-wide transcriptomic and proteomic analyses of bollworm-infested developing cotton bolls revealed the genes and pathways involved in the insect pest defence mechanism. | cotton bollworm, helicoverpa armigera, is a major insect pest that feeds on cotton bolls causing extensive damage leading to crop and productivity loss. in spite of such a major impact, cotton plant response to bollworm infection is yet to be witnessed. in this context, we have studied the genome-wide response of cotton bolls infested with bollworm using transcriptomic and proteomic approaches. further, we have validated this data using semi-quantitative real-time pcr. comparative analyses have ... | 2016 | 26799171 |
| how predictable are the behavioral responses of insects to herbivore induced changes in plants? responses of two congeneric thrips to induced cotton plants. | changes in plants following insect attack are referred to as induced responses. these responses are widely viewed as a form of defence against further insect attack. in the current study we explore whether it is possible to make generalizations about induced plant responses given the unpredictability and variability observed in insect-plant interactions. experiments were conducted to test for consistency in the responses of two congeneric thrips, frankliniella schultzei trybom and frankliniella ... | 2013 | 23691075 |
| chloroplast-targeted expression of recombinant crystal-protein gene in cotton: an unconventional combat with resistant pests. | plants transformed with single bt gene are liable to develop insect resistance and this has already been reported in a number of studies carried out around the world where bt cotton was cultivated on commercial scale. later, it was envisaged to transform plants with more than one bt genes in order to combat with resistant larvae. this approach seems valid as various bt genes possess different binding domains which could delay the likely hazards of insect resistance against a particular bt toxin. ... | 2013 | 23643479 |