Ecological differentiation and variety degeneration of maize under heavy metal contamination

Abstract

Abstract: Different populations of maize (Zea mays L.) having been exposed to heavy metal contamination in different durations were replanted on unpolluted soil,and the difference of their quantitative characters such as average relative growth rate,flowering percentage at different time, plant weight, plant height,ears weight, 50 seeds weight and lengths of effective and noneffective ears was investigated.The results show that the populations exposed to heavy metal contamination in a longer duration had a lower relative growth rate,shorter lifecycle,shorter height and lower productivity,indicating that the adaptation of maize to heavy metal contamination led to its ecological differentiation and variety degeneration. The tolerance cost of maize in adapting heavy metal contamination was also discussed.

Key words: Maize, Heavy metal contamination, Ecological differentation, Variety degeneration

Zhang Taiping, Duan Changqun, Hu Bin, Wang Huanxiao, Peng Shaolin. Ecological differentiation and variety degeneration of maize under heavy metal contamination[J]. Chinese Journal of Applied Ecology, 1999, 10(6): 743-747.

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