Cortex proliferation in the root is a protective mechanism against abiotic stress
Cortex proliferation in the root is a protective mechanism against abiotic stress
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DOI：
10.1080/15592324.2015.1011949
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发表时间：
2015-05-04
影响因子：
2.9
通讯作者：
Cui, Hongchang
中科院分区：
文献类型：
--
作者：
Cui, Hongchang
虽然根作为一个器官在养分和水分吸收以及锚定中起着关键作用，但单个细胞类型的功能不同。皮层被认为是根中分化程度最低的细胞类型，但对其在植物生长和生理中的作用知之甚少。近年来的研究发现，氧化应激可以诱导皮层细胞增殖。由于所有类型的非生物胁迫都会导致氧化应激，这一发现表明皮质在应对非生物胁迫中的作用。这项研究使用spy突变体来验证这一假设，spy突变体在根部有一层额外的皮层。有趣的是，spy突变体被证明对施加在叶子上的盐和氧化剂非常敏感，但它对土壤中的这些化合物的耐受性与野生型一样。这一结果支持了皮层对土壤非生物胁迫具有保护作用的观点。
Although as an organ the root plays a pivotal role in nutrient and water uptake as well anchorage, individual cell types function distinctly. Cortex is regarded as the least differentiated cell type in the root, but little is known about its role in plant growth and physiology. In recent studies, we found that cortex proliferation can be induced by oxidative stress. Since all types of abiotic stress lead to oxidative stress, this finding suggests a role for cortex in coping with abiotic stress. This hypothesis was tested in this study using the spy mutant, which has an extra layer of cortex in the root. Interestingly, the spy mutant was shown to be hypersensitive to salt and oxidizing reagent applied to the leaves, but it was as tolerant as the wild type to these compounds in the soil. This result lends support to the notion that cortex has a protective role against abiotic stress arising from the soil.