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        Assessing the potential of spider plant (Cleome gynandra L.) as a trap crop for the management of specialist feeders on vegetable brassicas

        Benjamin Zedler,R. Srinivasan,F.-C. Su 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.2

        In a field experiment with spider plant (Cleome gynandra L.), high infestation by various brassica specialist Lepidopteron pests such as the Cabbage Head Caterpillar (CHC), Crocidolomia binotalis and Cabbage Webworm (CWW), Hellula undalis was observed. Multiple- and two-choice tests showed that Indian mustard (Brassica juncea) is the most preferred brassica species for the diamondback moth (DBM), Plutella xylostella and CWW, whereas CHCs preferred pak choi (B. rapa subsp. Chinensis). Although the brassica specialists overwhelmingly feed on spider plant, females of these brassica specialists did not lay significantly more eggs on spider plant or the most preferred brassica plants in no- and two-choice experiments. In a multiple-choice test, they did not have any significant oviposition preference for brassica plants and spider plant at either vegetative or flowering stages. CHC and DBM did not show any significant oviposition preference for young or old spider plant leaves within a plant. The volatiles from spider plant did not enhance the egg laying of these specialist feeders on their most preferred brassica species. Larval feeding experiments confirmed that spider plant was less suitable for DBM, CHC and CWW. In nethouse experiments with an increasing percentage of spider plant as a trap crop, DBM and CHC laid eggs only on the most preferred brassica species; however, the total number of eggs laid decreasedwith a higher percentage of spider plant. Based on the results of this study, we evaluated the potential of spider plant to serve as a trap crop.

      • A Na<sup>+</sup>-coupled C<sub>4</sub>-dicarboxylate transporter (Asuc_0304) and aerobic growth of <i>Actinobacillus succinogenes</i> on C<sub>4</sub>-dicarboxylates

        Rhie, Mi Na,Yoon, Hyo Eun,Oh, Hye Yun,Zedler, Sandra,Unden, Gottfried,Kim, Ok Bin Society for General Microbiology 2014 Microbiology Vol.160 No.7

        <P><I>Actinobacillus succinogenes</I>, which is known to produce large amounts of succinate during fermentation of hexoses, was able to grow on C<SUB>4</SUB>-dicarboxylates such as fumarate under aerobic and anaerobic conditions. Anaerobic growth on fumarate was stimulated by glycerol and the major product was succinate, indicating the involvement of fumarate respiration similar to succinate production from glucose. The aerobic growth on C<SUB>4</SUB>-dicarboxylates and the transport proteins involved were studied. Fumarate was oxidized to acetate. The genome of <I>A. succinogenes</I> encodes six proteins with similarity to secondary C<SUB>4</SUB>-dicarboxylate transporters, including transporters of the Dcu (C<SUB>4</SUB>-dicarboxylate uptake), DcuC (C<SUB>4</SUB>-dicarboxylate uptake C), DASS (divalent anion : sodium symporter) and TDT (tellurite resistance dicarboxylate transporter) family. From the cloned genes, Asuc_0304 of the DASS family protein was able to restore aerobic growth on C<SUB>4</SUB>-dicarboxylates in a C<SUB>4</SUB>-dicarboxylate-transport-negative <I>Escherichia coli</I> strain. The strain regained succinate or fumarate uptake, which was dependent on the electrochemical proton potential and the presence of Na<SUP>+</SUP>. The transport had an optimum pH ~7, indicating transport of the dianionic C<SUB>4</SUB>-dicarboxylates. Transport competition experiments suggested substrate specificity for fumarate and succinate. The transport characteristics for C<SUB>4</SUB>-dicarboxylate uptake by cells of aerobically grown <I>A. succinogenes</I> were similar to those of Asuc_0304 expressed in <I>E. coli</I>, suggesting that Asuc_0304 has an important role in aerobic fumarate uptake in <I>A. succinogenes</I>. Asuc_0304 has sequence similarity to bacterial Na<SUP>+</SUP>-dicarboxylate cotransporters and contains the carboxylate-binding signature. Asuc_0304 was named SdcA (<U>s</U>odium-coupled C<SUB>4</SUB>-<U>d</U>i<U>c</U>arboxylate transporter from <I><U>A</U></I>. <I>succinogenes</I>).</P>

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