铝、镉对小麦幼苗生长的影响及其DNA损伤效应研究

本研究旨在探索Al^3＋、Cd^2＋对小麦幼苗生长的影响及其DNA损伤效应。结果表明：（1）所试浓度Al^3＋、Cd^2＋不仅不同程度抑制2d龄和12d龄幼苗根系和地上部分的生长，而且表现明显的DNA损伤效应；（2）除Al^3＋对幼苗地上部分鲜重、干重的影响及Cd^2＋对幼苗根系生长速率的影响外，其余生长指标显示2d龄幼苗比12d龄幼苗对Al^3＋、Cd^2＋更敏感，这与导致2d龄幼苗DNA损伤的Al^3＋、Cd^2＋浓度明显低于12d龄幼苗的结果一致。研究结果表明，DNA损伤可能是Al^3＋、Cd^2＋抑制2d龄和12d龄小麦幼苗生长的重要原因之一。

Effects and DNA Damages of Al3+ and Cd2+ in Wheat Seedlings

The study was intended to probe the effects and DNA damages of Al3+ and Cd2+ in wheat seedlings. The results showed that (1) Al3+ and Cd2+ at all the tested concentrations not only inhibited the roots and shoots of both 2-day-old and 12-day-old seedlings but also presented obvious DNA damages,and (2) besides Al3+ affected the seedlings in aboveground fresh and dry weights and Al3+ affected the seedlings in growth rate,the other growth indexes indicated that the 2-day-old seedlings were more sensitive to Al3+ and Cd2+ than the twelve day old seedlings and this was consistent with the result that the Al3+ and Cd2+ concentrations at which DNA damages occurred in the 2-day-old seedlings were much more lower than those in the 12-day-old seedlings. The results of the study illustrated that DNA damage was probably one of the important reasons why Al3+ and Cd2+ inhibited the 2-day-old and 12-day-old seedlings of wheat.