玉米受旱的明显后果是产量剧减,损失数量取决于胁迫的持续时间和胁迫期间植株所处的发育时期。因可以利用玉米种质的广泛耐旱遗传变异性,所以在水分亏缺循环出现的地区,选育耐逆境的品种不仅必要而且可行(Jensen,1971;Nelson,1972;Martiniello,1984)。然而,有效的早期筛选技术仍然是抗旱选育的焦点。据报道,田间测定的玉米抗旱性和实验室 The obvious consequence of drought in maize is the sharp decline in production, the amount of loss depends on the duration of the stress and the period of development in which the plants are under stress. It is not only necessary but also feasible to breed stress tolerant cultivars in areas where water deficit cycles occur because of the wide genetic variability of drought tolerance in maize germplasm (Jensen, 1971; Nelson, 1972; Martiniello, 1984). However, effective early screening techniques remain the focus of drought resistance breeding. It has been reported field-tested maize drought resistance and laboratory