Publications

comparative host selection responses of specialist (helicoverpa assulta) and generalist (helicoverpa armigera) moths in complex plant environments.	we tested the behavioral responses of ovipositing females and natal larvae of two sibling species, a generalist helicoverpa armigera (hübner) and a specialist helicoverpa assulta (guenée), to odor sources emitted from different combinations of six plant species (tobacco, nicotiana tabacum; hot pepper, capsicum annuum; tomato, solanum esculentum; cotton, gossypium hirsutum; peanut, arachis hypogaea; maize, zea mays). under the conditions of plant materials versus corresponding controls, both stag ...	2017	28182679
next-generation transgenic cotton: pyramiding rnai and bt counters insect resistance.	transgenic crops producing insecticidal proteins from the bacterium bacillus thuringiensis (bt) are extensively cultivated worldwide. to counter rapidly increasing pest resistance to crops that produce single bt toxins, transgenic plant 'pyramids' producing two or more bt toxins that kill the same pest have been widely adopted. however, cross-resistance and antagonism between bt toxins limit the sustainability of this approach. here we describe development and testing of the first pyramids of co ...	2017	28199783
various bioactivity and relationship of structure-activity of matrine analogues.	for the first time, the botanic source natural product matrine was reported to have more potent inhibitory activity against tobacco mosaic virus (tmv) than the commercial virucide ribavirin. on the basis of the structural diversity modification strategy, a series of matrine derivatives was synthesized and systematically evaluated for their antiviral activity against tmv, fungicidal activity, and insecticidal activity. as a result, compounds 3 (inhibitory rate 67.3%, 69.5%, 63.7%, 63.0% at 500 μg ...	2017	28248103
effects of site-mutations within the 22 kda no-core fragment of the vip3aa11 insecticidal toxin of bacillus thuringiensis.	bacillus thuringiensis vegetative insecticidal proteins (vips) are not homologous to other known cry proteins, and they act against lepidopteran larvae via a unique process. all reported studies on the mode of action of vip3 proteins have been performed on the vip3a family, mostly on the vip3aa subfamily. vip3aa proteins are activated by midgut proteases, and they cross the peritrophic membrane and bind specific proteins in apical membrane epithelial midgut cells, which results in pore formation ...	2017	28321527
characterization of parasporin gene harboring indian isolates of bacillus thuringiensis.	bacillus thuringiensis (bt) is popularly known as insecticidal bacterium. however, non-insecticidal bt strains are more extensively available in natural environment than the insecticidal ones. parasporin (ps) is a collection of genealogically heterogeneous cry proteins synthesized in non-insecticidal isolates of bt. an important character generally related with ps proteins is their strong cytocidal activity preferentially on human cancer cells of various origins. identification and characterizat ...	2014	28324389
mitochondrial dna and trade data support multiple origins of helicoverpa armigera (lepidoptera, noctuidae) in brazil.	the old world bollworm helicoverpa armigera is now established in brazil but efforts to identify incursion origin(s) and pathway(s) have met with limited success due to the patchiness of available data. using international agricultural/horticultural commodity trade data and mitochondrial dna (mtdna) cytochrome oxidase i (coi) and cytochrome b (cyt b) gene markers, we inferred the origins and incursion pathways into brazil. we detected 20 mtdna haplotypes from six brazilian states, eight of which ...	2017	28350004
transgenic pigeonpea events expressing cry1ac and cry2aa exhibit resistance to helicoverpa armigera.	independent transgenic pigeonpea events were developed using two cry genes. transgenic cry2aa-pigeonpea was established for the first time. selected transgenic events demonstrated 100% mortality of helicoverpa armigera in successive generations. lepidopteran insect helicoverpa armigera is the major yield constraint of food legume pigeonpea. the present study was aimed to develop h. armigera-resistant transgenic pigeonpea, selected on the basis of transgene expression and phenotyping. agrobacteri ...	2017	28352969
baseline susceptibility of field populations of helicoverpa armigera to bacillus thuringiensis vip3aa toxin and lack of cross-resistance between vip3aa and cry toxins.	the cotton bollworm helicoverpa armigera (hübner) is one of the most damaging cotton pests worldwide. in china, control of this pest has been dependent on transgenic cotton producing a single bacillus thuringiensis (bt) protein cry1ac since 1997. a small, but significant, increase in h. armigera resistance to cry1ac was detected in field populations from northern china. since vip3aa has a different structure and mode of action than cry proteins, bt cotton pyramids containing vip3aa are considere ...	2017	28379206