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首页> 外文会议>International Symposium on Structure and Function of Roots >Effect of water stress upon root meristems of pea seedlings: the role of quantitative and qualitative changes in protein patterns
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Effect of water stress upon root meristems of pea seedlings: the role of quantitative and qualitative changes in protein patterns

机译：水分胁迫对豌豆幼苗根系的影响：定量和定性变化在蛋白质模式中的作用

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To investigate the effect of water stress on the activity of meristems we used an hydroponics culture of pea seedlings to which polyethilene-glicole (PEG) has been gradually added to give the external water potential of - 1.7 MPa. We focused our attention on primary root meristem although the meristematic tissue of plumules has been considered as well. Our data showed that under water stress conditions, meristematic cells from primary root arrest their activity irreversibly, while shoot meristems rapidly recover their activity when the seedlings are placed in a normal water conditions. However, the inhibition of cell division of primary root meristems does not interfere with the development of a complete root apparatus; in fact, lateral roots arestill formed during water stress from initials situated in the pericycle zone, which give origin to a meristematic tip. The different sensitivity to water stress shown by meristematic cells situated in primary roots, lateral roots or shoot plumules suggests that the tolerance to water stress in meristematic tissue may depend upon factors related to its developmental stage or to the type of 'mother initial' responsible for forming this tissue. The quantitative and qualitative differences in the content of specific proteins showed between meristems during water stress may support this idea. Some of the proteins examined in our samples have shown a striking immuno-affinity for an antibody raised against a conserved sequence common to all the Dehydrins. The proteins recognised by the anti-Dehydrins antibody accumulated in a considerable amount in meristematic cells of plumules during water stress conditions. Since Dehydrins have been proposed to play a protective role during water stress, it may be speculated that the better tolerance shown by shoot or lateral-root meristems is correlated with the accumulation of these specific proteins.
机译：为了探讨水分胁迫对商品活性的影响，我们使用了豌豆幼苗的水培培养物，逐渐加入泛烯烯-Glicole（PEG），以提供-1.7MPa的外部水电位。我们将我们的注意力集中在原代根本上，尽管羽毛的共同组织也被考虑。我们的数据显示，在水胁迫条件下，原发性根源的共源细胞不可逆地捕获它们的活动，而幼苗在常规水条件下迅速恢复活性。然而，抑制原发性根系的细胞分解不会干扰完整的根装置的开发;实际上，在位于截面区域中的初始排列的水胁迫期间形成的横向根丸丸，其始于始终是共聚物尖端。在初级根部，侧面根或芽羽毛中的共源细胞显示的不同敏感性表明，对共同组织中的水分胁迫的耐受性可能取决于与其发展阶段有关的因素或“母亲初始”负责的因素形成这种组织。在水分压力期间的分生剂之间显示特定蛋白质含量的定量和定性差异可以支持这种想法。在我们的样品中检查的一些蛋白质已经显示出对抗体施加对所有脱氢的保守序列的抗体的显着免疫亲和力。在水胁迫条件下，抗脱水抗体识别以相当多的含量在羽毛的共塑料细胞中累积。由于已经提出了在水胁迫期间发挥保护作用的脱水，因此可以推测芽或侧根分泌显示的更好耐受性与这些特定蛋白质的积累相关。

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