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cje ›› 2012, Vol. 31 ›› Issue (09): 2330-2336.

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Reactive oxygen production and genome DNA polymorphism change in root tip tissues of two leguminous species with different tolerance under Cd stress.

ZHANG Fen-qin1, ZHANG Hong-xiao2, SHEN Zhen-guo3**   

  1. (1College of Agriculture and Biotechnology, Hexi University, Zhangye 734000, Gansu, China; 2College of Agriculture, Henan University of Science and Technology, Luoyang 471003, Henan, China; 3College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China)
  • Online:2012-09-10 Published:2012-09-10

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Abstract: The effects of cadmium (Cd) on the reactive oxygen productions and genome DNA polymorphism changes in roots of Phaseolus aureus Roxb. cv. VC3762 (Cdsensitive species) and Vicia sativa L. cv. 333/A (Cdresistant species) seedlings were investigated using hydroponic solution culture. The results showed that Cd stress decreased the genomic template stability and induced the changes of the genome DNA polymorphism in the root tips of the two species, manifesting the variation of band intensity, loss of normal bands, and appearance of new bands. Meanwhile, Cd stress inhibited the root growth and increased the production of O2-· and the accumulation of H2O2 in the roots. The root length of the two species under Cd stress was negatively correlated with the production of O2-·, accumulation of H2O2, and genome DNA polymorphism in root tip tissues, and the genome DNA polymorphism was positively correlated with the accumulation of H2O2 under Cd stress.

Key words: methyl halides, emission fluxes, natural emission, salt marsh, coastal zone.