Hydrogen peroxide homeostasis provides beneficial micro‐environment for SHR‐mediated periclinal division in Arabidopsis root
| Autor: | Pengxue Li, Qiaozhi Yu, Hong Wang, Shuang Li, Qiang Cai, Haiyang Li, Shuang Wu, Jie Cheng |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Physiology Arabidopsis Endogeny Plant Science Plant Roots 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Gene Expression Regulation Plant Asymmetric cell division Homeostasis Transcription factor chemistry.chemical_classification Reactive oxygen species biology Arabidopsis Proteins Chemistry Superoxide Hydrogen Peroxide biology.organism_classification Cortex (botany) Cell biology 030104 developmental biology Endodermis 010606 plant biology & botany |
| Zdroj: | New Phytologist. 228:1926-1938 |
| ISSN: | 1469-8137 0028-646X |
| DOI: | 10.1111/nph.16824 |
| Popis: | The precise regulation of asymmetric cell division (ACD) is essential for plant organogenesis. In Arabidopsis roots, SHORT-ROOT (SHR) functions to promote periclinal division in cortex/endodermis initials, which generate the ground tissue patterning. Although multiple downstream transcription factors and interplaying hormone pathways have been reported, the cellular mechanism that affects SHR-mediated periclinal division remains largely unclear. Here, we found that SHR can substantially elevate reactive oxygen species (ROS) levels in Arabidopsis roots by activating respiratory burst oxidase homologs (RBOHs). Among the ROS products, hydrogen peroxide (H2 O2 ) rather than superoxide (O2 - ) was shown to play a critical role in SHR-mediated periclinal division. Scavenging H2 O2 could markedly impair the ability of SHR to induce periclinal division. We also show that salicylic acid (SA) can promote H2 O2 production by repressing CAT expression, which greatly increased periclinal division in root endodermis. As a result, middle cortex was more frequently formed in the endodermis of snc1, a mutant with accumulated endogenous SA and H2 O2 . In addition to RBOHs, SHR also activated the SA pathway, which might contribute to the elevated H2 O2 level induced by SHR. Thus, our data suggest a mechanism by which SHR creates the optimal micro-environment for periclinal division by maintaining ROS homeostasis in Arabidopsis roots. |
| Databáze: | OpenAIRE |
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