Background The Bemisia tabaci is a major leaf feeding insect pest to pepper ( Capsicum annuum ), causing serious damage to pepper growth and yield. It is particularly important to study the mechanism of pepper resistance to B. tabaci , and to breed and promote the varieties of pepper resistant to B. tabaci . However, very limited molecular mechanism is available about how plants perceive and defend themselves from the destructive pest. Proteome technologies have provided an idea method for studying plant physiological processes in response to B. tabaci . Results Here, a highly resistant genotype and a highly susceptible genotype were exposed to B. tabaci feeding for 48 h to explore the defense mechanisms of pepper resistance to B. tabaci . The proteomic differences between both genotypes were compared using isobaric tag for relative and absolute quantification (iTRAQ). The quantitative data were validated by parallel reaction monitoring (PRM). The results showed that 37 differential abundance proteins (DAPs) were identified in the RG (resistant genotype), while 17 DAPs were identified in the SG (susceptible genotype) at 48 h after B. tabaci feeding. 77 DAPs were identified when comparing RG with SG without feeding. The DAP functions were determined for the classification of the pathways, mainly involved in redox regulation, stress response, protein metabolism, lipid metabolism and carbon metabolism. Some candidate DAPs are closely related to B. tabaci resistance such as annexin D4-like (ANN4), calreticulin-3 (CRT3), heme-binding protein 2-like (HBP1), acidic endochitinase pcht28-like (PR3) and lipoxygenase 2 (LOX2). Conclusions Taken together, this study indicates complex resistance-related events in B. tabaci interaction, provides novel insights into the molecular mechanism underlying the response of plant to B. tabaci , and identifies some candidate proteins against B. tabaci attack. Electronic supplementary material The online version of this article (10.1186/s12870-019-1849-0) contains supplementary material, which is available to authorized users.

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Rice seedlings (Oryza sativa cv. Te Qin No. 1) were hydroponically grown in Espino's solution containing various levels of paclobutrazol introduced into the solution at the three-leaf stage. After the 15th day of treatment, several mineral elements were determined to evaluate the effect of paclobutazol on mineral uptake.In the root, paclobutrazol increased the concentration (on a dry weight basis) of N, P, K, and Cu, decreased Ca and Fe, and did not affect Mg. In the shoot, paclobutrazol enhanced N, P, Ca, and Cu concentration, but decreased Mg, and did not influence K And Fe. In the whole seedling, P, Ca, and Cu concentrations were increased, but N, K, Mg, and Fe were not changed.The total content of mineral elements (on per plant basis) in the shoot and whole seedlings was decreased by paclobutrazol treatment. Fe in the root also decreased.Based on the results mentioned above, paclobutrazol, in general, does not increase the total content of mineral elements in the plant; however, if element concentrations are expressed on a dry weight basis, they show an increase. This is probably due to paclobutrazol inhibition of plant growth. INTRODUCTIONThe influence of plant growth retardants on plant growth and physiology are relatively well understood but their effects on mineral nutrition is still unclear. Chlormequat increased concentration of a majority of mineral elements in different parts of wheat, and soybean (4) matthiola incana and althaea rosea (5).Faclobutrazol significandy increased the concentration of 11 kinds of mineral elements in leaves of apple seedlings in water culture (10), but the change in