摘要
在室内人工模拟高温环境，测定了９个苜蓿品种幼苗的细胞膜透性、游离脯氨酸含量、受害率及恢复生长状况。结果表明膜透性变化、游离脯氨酸含量与苜蓿品种幼苗的抗热能力呈负相关；各品种幼苗的受害温度范围是＞４２℃＜４７℃；根据综合评定，９种苜蓿品种幼苗的抗热能力的次序为：草原２号苜蓿＞公农１号苜蓿＞新疆抗旱苜蓿＞沙湾苜蓿＝芋县苜蓿＞紫花苜蓿＞阳高苜蓿＞公农２号苜蓿＝准格尔苜蓿。
Under high temperature conditions simulated in laboratory, the cell mem-brane permeability,free proline content,damage rate and restoring growth state of seedlingsof 9 alfalfa cultivars were determined. The results showed that the membrane permeabilityand free proline content of alfalfa seedlings were negatively correlated with their heat resis-tances;the harmful temperature to alfalfa cuItivars ranged from 42℃ to 47℃;according toa comprehensive evaluation, the heat resisances of seedling of the 9 cultivars can be rankedin the order:Caoyan No. 2>Gongnong No. 1>Xinjangkanghan>Shawan=Yuxie>Alfalfa>Yanggao>Gongnong No.2 = Zunger.
