棉 花 学 报 Cotton Science 2007，19(1)：47-51
Studies on Differences in K Uptake Efficiency of seedling among Cotton Varieties Abstract：In order to identify whether susceptibility of cotton to K deficiency is related with Bt gene and/or CpTI gene introduced into cotton，this work，under hydroponic culture，explored the differences in K uptaking among transgenic Bt and CpTI cotton cultivars (CCRI 41) and conventional cotton cultivars ( CCRI 36 and CCRI 35). The results showed that seedlings of CCRI 35，CCRI 41 at 6～7 leaf stage had significantly higher biomass and K accumulation than CCRI 36，while cultivated at 0.5 mmol·L-1 K，which enable about 80% of the most growth rate of cotton seedlings. More K accumulation in CCRI 35 plant was mainly due to its significantly higher active absorbing surface area of root (AASA). However，comparatively higher AASA and comparatively higher Imax maybe caused more K accumulation in CCRI 41 plant comprehensively. Despite of its highest Imax among three cultivars，K accumulation in CCRI 36 plant was less，which might be attributed to its significantly lower AASA and feedback inhibition on K uptaking by higher K concentration in the plant. Under the condition of this experiment，there was significant difference in K accumulation among cotton cultivars，but which was not necessarily pertinent to Bt-gene and CpTI gene introduction.
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