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   2017, Vol.16 No.09 

   Published 2017-09-20

A plant chimera containing cells of different genetic origins in the shoot apical meristem (SAM) will be morphologically and chemically different compared with the parents, and thus may result in differential resistance to herbivores. Two periclinal chimeras (labeled as TTC and TCC) were produced by shoot apex grafting in vitro between tuber mustard (TTT) and red cabbage (CCC). Both chimeras possessed leaf trichomes as tuber mustard, however, TTC had significantly more trichomes than TCC. Leaf wax content of both chimeras was intermediate between the two parents. Five aliphatic and two indole glucosinolates were detected in both chimeras, whereas three and one aliphatic glucosinolates were not detected in tuber mustard and red cabbage, respectively. The olfactory preference assays indicated that Bemisia tabaci preferred to CCC, followed by two chimeras and TTT, and the number of eggs laid showed the same pattern. Interestingly, more whiteflies landed on TTT plants than the other three types in a free choice experiment and the developmental duration from egg to adult was the shortest on TTT and increased on two chimeras and CCC. The results indicate that the plant traits of leaf waxes, trichomes and glucosinolates are influenced by interactions amongst cell layers of SAM. The overall findings suggest that periclinal chimera systems can be a valuable approach for the study of plantinsect interactions and may also be useful for future resistance breeding. See pages 2009–2018 by Li et al. in details.

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