Abstract: This paper statistically analysed the Pb intake by nutritive organs of Chinese white cabbage (Brassica chinensis) and Chinese radish(Raphanus sativus),which showed that on the credibility of 95%, the intake rates between shoot and root and between leaf and root of cabbage are respectively 47.62?5.94(%) and 11.83?2.30(%); and those of radish are respectively 49.62?5.24(%) and 10.89?1.70(%). From regressive analysis, mathematical models of Pb intake between different organs are obtained with high statistical significance. These results have practical values in the detection and control of vegetable pollution.

Key words: Caragana spp., endophytic bacteria, stress resistance, 16S rDNA, phylogeny