Abstract
Corpse morphology, nuclear DNA fragmentation, expression of senescence-associated genes (SAG) and cysteine protease profiles were investigated to understand cell death patterns in a cell cycle-synchronised Arabidopsis thaliana cell suspension culture treated with four physiological stressors in the late G2 phase. Within 4 h of treatment, polyethylene glycol (PEG, 20 %), mannose (100 mM) and hydrogen peroxide (2 mM) caused DNA fragmentation coinciding with cell permeability to Evans Blue (EB) and produced corpse morphology corresponding to apoptosis-like programmed cell death (AL-PCD) with cytoplasmic retraction from the cell wall. Ethylene (8 mL per 250-mL flask) caused permeability of cells to EB without concomitant nuclear DNA fragmentation and cytoplasmic retraction, suggesting necrotic cell death. Mannose inducing glycolysis block and PEG causing dehydration resulted in relatively similar patterns of upregulation of SAG suggesting similar cell death signalling pathways for these two stress factors, whereas hydrogen peroxide caused unique patterns indicating an alternate pathway for cell death induced by oxidative stress. Ethylene did not cause appreciable changes in SAG expression, confirming necrotic cell death. Expression of AtDAD, BoMT1 and AtSAG2 genes, previously shown to be associated with plant senescence, also changed rapidly during AL-PCD in cultured cells. The profiles of nine distinct cysteine protease-active bands ranging in size from ca. 21.5 to 38.5 kDa found in the control cultures were also altered after treatment with the four stressors, with mannose and PEG again producing similar patterns. Results also suggest that cysteine proteases may have a role in necrotic cell death.
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Acknowledgments
The authors wish to thank Dr. Renier van der Hoorn for supplying the biotin-labelled protease inhibitor (DCG-04), Dr. Murray Grant (Imperial College, London Wye campus, Kent, UK) for supplying the AtBI-1 cDNA, Dr. Jeff Dangl (University of North Carolina, Chapel Hill, NC, USA) for supplying the LSD1 cDNA, Dr. Paul Birch (SCRI, Invergowrie, UK) for supplying AtSTLB1 and the ABRC (Columbus, OH, USA) for supplying the AtSPT1 EST. We wish to thank Dr. Ross Bicknell and Sylvia Erasmuson for the use of their equipment and technical expertise in flow cytometry. We thank Andrew Mullen and Sriya Pathirana for culture media preparation. Valuable comments by Drs. Dave Brummell and Donald Hunter on the manuscript are also gratefully appreciated. This work was supported by the New Zealand Foundation for Research, Science and Technology (now the Ministry of Business, Innovation and Employment) under C02X0701 ‘Future Vegetables’ programme.
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JE, RP and DH designed the experiments; RP, PW and JE conducted the research; DH conducted the statistical analysis; RP, JE and DH wrote the manuscript.
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Pathirana, R., West, P., Hedderley, D. et al. Cell death patterns in Arabidopsis cells subjected to four physiological stressors indicate multiple signalling pathways and cell cycle phase specificity. Protoplasma 254, 635–647 (2017). https://doi.org/10.1007/s00709-016-0977-8
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DOI: https://doi.org/10.1007/s00709-016-0977-8