不同植物在水分胁迫条件下脯氨酸的累积与抗旱性的关系

Ca植物春小麦幼苗叶片累积脯氨酸的数量随水分胁迫时间和强度递增,累积的数量与品种的抗旱性没有相关性。C_4植物玉米和高粱累积脯氨酸的数量低于小麦,但高粱多于玉米。CAM植物落地生根脯氨酸含量略有变化。旱生植物细枝岩黄芪的同化枝累积脯氨酸的数量高于中生植物钻天杨和槐的叶片,而梭梭的同化校则低于槐而高于钻天杨。表明这些植物累积脯氨酸的数量与它们的抗旱性无夫。因此似不宜用脯氨酸数量的多少作为植物抗旱性的生理指标。

The Correlation of Proline Accumulation and Drought Resistance in Various Plants under Water Stress Condition

Proline content of wheat leave was increa-sed with time and intensity of water stress. Butthere is not correlation of the increase of prolinecontent and drought resistance of variety (Table1). C_4 plant(sorghum and maize) accumulatesless proline than C_3 plant (wheat) (Table 2).Proline content of CAM plant(Kalanchoe punnata)is the least, only increases lightly (Table 3, 4).Proline content of assimilating branch in Hedy-sarum scoparium of xerophyte is more than thatof leave Populus nigra and Sophora japonica ofmesophyte (Table 5). Proline content of as-similating branch of Haloxylon ammodendronaccumulated is more than that of P.nigra butless than that of S japonica (Table 6). The accumulation of proline mentionedabove is not correlated with their drought re-sistance in the plant under water stress, so isn'tsuited for the criterion of plant drought resis-tance