Plant Physiology and Biochemistry2022，Vol.1869.DOI:10.1016/j.plaphy.2022.06.029

Ultra-low concentration of chlorine dioxide regulates stress-caused premature leaf senescence in tobacco by modulating auxin, ethylene, and chlorophyll biosynthesis

Huang, Yue Li, Xinyu Duan, Ziwei Li, Jinjing Jiang, Yuchen Cheng, Siming Xue, Tao Zhao, Fenglan Sheng, Wei Duan, Yongbo
Plant Physiology and Biochemistry2022，Vol.1869.DOI:10.1016/j.plaphy.2022.06.029
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  • NSTL
  • Elsevier

Ultra-low concentration of chlorine dioxide regulates stress-caused premature leaf senescence in tobacco by modulating auxin, ethylene, and chlorophyll biosynthesis

Huang, Yue 1Li, Xinyu 1Duan, Ziwei 1Li, Jinjing 1Jiang, Yuchen 1Cheng, Siming 1Xue, Tao 1Zhao, Fenglan 1Sheng, Wei 1Duan, Yongbo1
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作者信息

  • 1. Huaibei Normal Univ
  • 折叠

Abstract

Exploring novel growth regulators for premature senescence regulation is important for tobacco production. In the present study, chlorine dioxide (ClO2) was explored as a novel plant growth regulator for tobacco growth, particularly its effect on leaf senescence and root development. The results showed that 0.15 mu M ClO2 maintained the lushness of detached leaves and whole plants. Also, the leaves of ClO2-treated plants exhibited a chlorophyll content of 58% higher than in CK (control) plants (P < 0.05). Besides, ClO2 treatment increased the biomass of roots and aboveground parts by 54 and 16%, respectively. The ClO2-treated plants also showed enhanced activities of antioxidant enzymes and significantly reduced malondialdehyde contents (P < 0.05). Moreover, ClO2 treatment remarkably alleviated drought-caused premature senescence in the tobacco plants and partly rescued the exogenous ethylene-caused plant dwarfism. The indole-3-acetic acid content in ClO2-treated plants was higher than in non-treated plants (P < 0.05), but ethylene content was significantly lower (P < 0.05). Gene expression analysis showed that ClO2 treatment remarkably suppressed ethylene synthase genes. However, the auxin biosynthesis and transport genes were up-regulated, with NtIAA17 increasing by five folds (P < 0.05). Further, ClO2 remarkably up-regulated the expression of chlorophyll biosynthesis genes, with a >20-fold increase in NtHEMA1 and NtCHLH expressions. These results designate ClO2 as a potential regulator for improving tobacco productivity by retaining higher chlorophyll content and promoting root growth.

Key words

Auxin/Chlorine dioxide/Ethylene/Nicotiana tabacum L/Premature leaf senescence/EXPRESSION/TOMATO

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出版年

2022
Plant Physiology and Biochemistry

Plant Physiology and Biochemistry

SCI
ISSN：0981-9428
被引量1
参考文献量49
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