摘要
在干旱胁迫处理下通过对白三叶植株叶、茎、根等器官及其生长部位的细胞质膜相对透性、丙二醛（ＭＤＡ）、游离脯氨酸含量、可溶性蛋白质含量及超氧化物歧化酶（ＳＯＤ）活性的研究表明，白三叶新生叶具有比功能叶较高的耐旱能力和渗透调节能力，茎尖在强度干旱胁迫下具有比茎成熟部位较低的质膜受伤程度和较高的渗透调节能力，两者的变化均与其体内ＳＯＤ活性存在对应关系；根成熟部位和根尖在干旱胁迫下维持较低的受害程度，随着干旱胁迫的增强，根成熟部位受伤提高的幅度高于根尖，但根尖部位的ＳＯＤ在干旱胁迫下失去诱导合成的作用，根成熟部位则表现为明显的诱导合成的趋势。干旱胁迫下白三叶各器官中ＳＯＤ活性为根＞茎＞叶，表现为一种植株水平的抗旱调节机制；植株各器官中以叶对干旱胁迫最敏感，功能叶是感受干旱胁迫的初始敏感部位，可作为植株感受干旱胁迫的监测部位。
A study on the relative permeability of plasmalemma and the contents of MDA、free proline and soluble protein and SOD activities in leaves、stems、roots and their growing portions of white clover (Trifolium repens L.) plant under drought stress on sand culture by stopping watering in green house was conducted. The results indicated that new emerging leaf shows higher drought tolerance and higher osmoregulation than functional leaf, and this tendency corresponds to their SOD activities; stem top shows lower plasmalemma injury and higher osmoregulation than stem mature portion under strong drought stress, which also well corresponds to their SOD activities. Root mature portion and room top maintain lower injury under drought stress, but root mature portion shows that its injury increase is higher than root top along with the strengthening stress.
出处
《中国草地》
CSCD
1997年第4期55-61,共7页
Grassland of China
基金
国家自然科学基金
