A protective role for the polyamine spermine against drought stress in Arabidopsis.
A protective role for the polyamine spermine against drought stress in Arabidopsis.
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DOI：
10.1016/j.bbrc.2006.11.041
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发表时间：
2007-01
影响因子：
3.1
通讯作者：
K. Yamaguchi;Yoshihiro Takahashi;T. Berberich;Akihiko Imai;Taku Takahashi;A. Michael;T. Kusano
中科院分区：
文献类型：
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作者：
K. Yamaguchi;Yoshihiro Takahashi;T. Berberich;Akihiko Imai;Taku Takahashi;A. Michael;T. Kusano
细胞内的多胺含量经常会随着非生物胁迫的变化而变化。然而，它的生理相关性尚不清楚。我们发现一种不能产生精胺的拟南芥突变体植物(ac15/spms)对高盐敏感。对突变体的干旱敏感性检测以及与野生型植物的比较表明，该突变体对干旱高度敏感。这种表型可以被精胺处理治愈，但不能被其他多胺腐胺和亚精胺治愈，这表明该突变体表现出的干旱敏感是由于精胺缺乏所致。在脱水胁迫开始后20min，野生型和突变型植株的失水率基本相同，但在较长时间的胁迫下，突变型植株的失水率高于野生型植株。与此结果一致的是，突变体叶片的气孔保持开放，而野生型叶片则关闭。基于收集的数据，我们讨论了精胺在应对干旱胁迫中的作用。
Cellular polyamine content often changes in response to abiotic stresses. However, its physiological relevance is unknown. We found that an Arabidopsis mutant plant (acl5/spms), which cannot produce spermine, is hypersensitive to high salt. Examination of drought sensitivity of the mutant and comparison with wild type plants indicated hypersensitivity to drought. This phenotype was cured by spermine pretreatment but not by the other polyamines putrescine and spermidine, suggesting that drought-hypersensitivity exhibited by the mutant is due to spermine deficiency. The water loss rate of wild type and mutant plants were similar until 20min after onset of dehydration stress, but after a longer exposure the rate in mutant plants was higher than in wild type plants. Consistent with this result, the stomata of the mutant leaves remained open while in wild type leaves they closed. Based on the collected data, we discuss a role for spermine in response to drought stress.