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《Journal of Anhui Agricultural Sciences》 2007-28
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Research on Aerial Part Growth and DNA Damage of Wheat Seedlings under Cr~(6+) Stress

HEI Shu-mei (College of Life Science,Yanan University,Yanan,Shaanxi 716000)  
[Objective] The aim was to clarify the toxicological mechanism of Cr6+ influencing the growth and development of wheat seedling.[Method] The influence of Cr6+ stress at 5~100 mg/L for 72 h on aerial part and the DNA damage of 3-day-old and 10-day-old wheat seedlings were studied.[Result] 5~100 mg/L Cr6 showed the effects of decreasing seedling height,fresh weight and dry weight of aerial part of two seedling-age seedlings.The 3-day-old seedlings were more sensitive to Cr6+ stress than 10-day-old seedlings.Cr6+ decreased the DNA content in wheat seedling leaves significantly and the declining extent of DNA content in the leaves of 3-day-old seedlings was bigger than that in the leaves of 10-day-old seedlings.5~100 mg/L Cr6+ all induced that the DNA hyperchromic effect value of aerial part of 3-day-old and 10-day-old seedlings were higher than that of CK.[Conclusion] The DNA damage made by Cr6+ may be one of main reasons influencing seedling growth of wheat seedlings with different ages.
【Fund】: 校级科研计划项目(YD2005-038)
【CateGory Index】: S512.1
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