Abstract
Aims
Metacaspases are cysteine-dependent proteases, which play essential roles in programmed cell death (PCD), and caspase-3-like protease is the crucial executioner. However, its response mechanism to aluminum (Al)-induced PCD is still elusive.
Methods
Here, the type I metacaspase gene in peanut (Arachis hypoganea L.), AhMC1, was cloned from the Al-sensitive cultivar ZH2. Physiological and biochemical methods, as well as gene expression analyses, were employed to explore its function in Al-induced PCD in peanut root tips.
Results
AhMC1 had a 1068-bp open reading frame, encoding a peptide of 355 amino acids, and the purified protein exhibited a high caspase-3-like protease activity. Its expression levels in different tissues of peanut varieties ZH2 and 99–1507 (Al-tolerant) varied under Al-stress conditions. The subcellular localization indicated that AhMC1 was transferred from mitochondria into the cytoplasm. Furthermore, overexpressing AhMC1 reduced the resistance to Al stress. Sense transgenic plants showed a low relative root growth rate, and reduced superoxide dismutase, peroxidase, and catalase activities, compared with wild-type and antisense transgenic plants under Al-stress conditions, but had a high root-cell death rate, and increased Al and maleic dialdehyde contents.
Conclusions
The data suggest that metacaspase AhMC1 is a positive factor in Al-induced PCD in peanut root tips.
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Abbreviations
- Al:
-
Aluminum
- AT:
-
Antisense transgenic
- CAT:
-
Catalase
- MC:
-
Metacaspase
- MDA:
-
Maleic dialdehyde
- PCD:
-
Programmed cell death
- POD:
-
Peroxidase
- RACE:
-
Rapid amplification of cDNA ends
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
- ST:
-
Sense transgenic
- WT:
-
Wild-type
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 31776190, 31560346, 31660350, 31701356, and 31860334), the Guangxi Natural Science Foundation of China (Grant No. 2016GXNSFBA380223), the Training Program for 1000 Young and Middle-aged Backbone Teachers of Guangxi Higher Education Institution in 2019.
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JZ and LFH conceived the general strategy; SCY, LSZ and CLP performed the experiments and analyzed the data; SZL and DX interpreted the results; AQW and WJX cultured the seedlings for experiments; SCY and SZL wrote the manuscript. JZ revised the manuscript. All the authors read and approved the final manuscript.
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Yao, S., Luo, S., Pan, C. et al. Metacaspase MC1 enhances aluminum-induced programmed cell death of root tip cells in Peanut. Plant Soil 448, 479–494 (2020). https://doi.org/10.1007/s11104-020-04448-w
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DOI: https://doi.org/10.1007/s11104-020-04448-w