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在室内人工模拟干旱条件,测定了干旱胁迫下披碱草和野大麦及其杂种幼苗的相对含水量、细胞膜透性、游离脯氨酸含量的变化。结果表明,干旱胁迫下亲本披碱草幼苗的组织相对含水量下降的幅度最低,细胞膜受害最轻,游离脯氨酸积累的最多,相对生长率最高,表现出很强的抗旱性。亲本野大麦幼苗的组织相对含水量下降的幅度最大,细胞膜受害最重,游离脯氨酸积累的最少,相对生长率最低,抗旱性弱。杂种F1幼苗的保水能力、细胞膜受害程度和游离脯氨酸积累能力、相对生长率均介于双亲之间,亦即其抗旱能力大于野大麦而小于披碱草,表现为双亲的中间型。正、反交对杂种F1的抗旱能力没有明显影响。
Under simulated indoor drought conditions, the changes of relative water content, membrane permeability and free proline content of Elymus dahuricus, Hordeum brevisubulatum and their hybrid seedlings under drought stress were measured. The results showed that under the drought stress, the relative water content of the seedlings of Elymus dahurica seedlings had the lowest decrease, the damage of cell membrane was the lightest, the accumulation of free proline was the most, and the relative growth rate was the highest, showing strong drought resistance. The relative water content of the progeny wild barley seedlings decreased the most, the cell membrane harmed most, the free proline accumulated the least, the relative growth rate was the lowest, and the drought resistance was weak. The hybrid rice F1 had the ability of retaining water, the degree of cell membrane damage and the accumulation of free proline. The relative growth rate of hybrid F1 was between that of parents, that is, its resistance to drought was greater than that of wild barley but less than that of Elymus dahurica. Positive and negative crosses had no significant effect on drought resistance of hybrid F1.