棉 花 学 报 Cotton Science 2006，18(4)：218-222
The Effects of Mixture of DPC and DTA-6 on Root Function of Transgenic Insect-Resistant Cotton Abstract：Transgenic insect-resistant cotton cultivars senesced prematurely more often than conventional cultivars in the North China Plain，which was likely related to its poor root function. We have found that mixture of DPC (mepiquat chloride) and DTA-6 (diethyl am inoethyl hexanoate) could improve the root development of transgenic insect-resistant cotton at seedling stage. The objective of this research is to further investigate the effect of mixture of DPC and DTA-6 on root function of transgenic insect-resistant cotton cultivar sGK321 from square stage to mass boll-forming stage under field condition. Compared with single application of DPC，mixture of DPC and DTA-6 improved the root function of sGK321 more effectively. For example，it had stronger root activity，synthesized more amino acids and cytokinin，uptaked and transported more NO3. However，DPC and mixture of DPC and DTA-6 decreased the uptake and transportation of Pi and K，which was possibly attributed to the higher use efficiency of them in plant. The increase of sugar allocated to root through phloem was responsible for the enhancement of root function of sGK321 by mixture of DPC and DTA-6. The results suggested that the application of mixture of DPC and DTA-6 could be used to prevent premature senescence of transgenic insect-resistant cotton.
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