NAA对大白菜吸收和积累~(45)Ca的效应

用ＮＡＡ处理大白菜根部和叶部，对其吸收和转运＾４５Ｃａ的变化进行了研究。结果表明，不论根部施用ＮＡＡ或叶面喷洒ＮＡＡ均使大白菜根对＾４５Ｃａ的吸收增加，提高茎叶＾４５Ｃａ的积累，尤其心叶中＾４５Ｃａ的积累显提高，同是改变心叶＾４５Ｃａ分布，使心叶叶缘的＾４５Ｃａ积累明显增加，且根部施用效果比叶面喷洒效果更明显。

EFFECTS OF NAA ON THE UPTAKE AND ACCUMULATION OF CALCIUM IN CHINESE CABBAGE

The involvement of plant growth regulator in polar transport of Ca 2+ in Chinese cabbage was studied using hydroponics system with 45 Ca radioisotope.Treatment of NAA either by foliage spray or root feeding increased the uptake of 45 Ca by root,raising the 45 Ca accumulation in stems,which was remarkably higher than that of control,especially in root fed plants.NAA treatment also increased the folio uptake of applied 45 Ca and thus the accumulation of 45 Ca in the leaves.This was more significant when NAA was applied to inner leaves.The same results was obtained in the experiment of 45 Ca radioautography with the whole plants.