Abstract
Acquired thermotolerance in plants refers to the ability to cope with lethal high temperatures following acclimatization at sublethal high temperatures. Acquired thermotolerance reflects an actual thermotolerance mechanism naturally occurring in plants and has been extensively used in thermotolerant line identification. In recent years, great progress has been achieved in the elucidation of biochemical, physiological, and molecular mechanisms of thermotolerance acquisition by using genomic approaches, including microarray analysis and mutation, knockout, and overexpression of related genes. Heat shock proteins (HSPs), such as Hsp101, BOBBER1, and Hsa32, have been shown to be important for inducement and maintenance of acquired thermotolerance. Downstream target genes and upstream regulation factors of HsfA2, including Hsa32, Apx2, small ubiquitin-like modifier proteins, FK506-binding proteins ROF1 (FKBP62) and ROF2 (FKBP65), and heat shock transcription factor binding protein, have been revealed to be involved in thermotolerance acquisition regulation. Moreover, the role of abscisic acid, ethylene, hydrogen peroxide, and salicylic acid in acquired thermotolerance has been demonstrated by molecular evidence from Arabidopsis mutants and transgenic lines. Most importantly, different molecular mechanisms of thermotolerance acquisition have been shown to underlie various acclimatization methods. Establishment of an experimental system similar to natural conditions is important for further exploration of natural thermotolerance mechanisms.
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Abbreviations
- HS:
-
Heat shock
- HSP:
-
Heat shock protein
- HSF:
-
Heat shock transcription factor
- SUMO:
-
Small ubiquitin-like modifier protein
- ROF1 (FKBP62):
-
FK506-binding proteins
- ROF2 (FKBP65):
-
FK506-binding proteins
- HSBP:
-
HSF binding protein
- IP3:
-
Inositol 1,4,5-trisphosphate
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Acknowledgments
This work was supported by the Scientific Research and Innovation Program of the Shanghai Municipal Education Commission (Tissue Culture and High-yield Cultivation Techniques of Taxus chinensis var. mairei [11CXY60]) and the Key Course Construction Program of the Shanghai Municipal Education Commission (Plant Physiology).
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Song, L., Jiang, Y., Zhao, H. et al. Acquired thermotolerance in plants. Plant Cell Tiss Organ Cult 111, 265–276 (2012). https://doi.org/10.1007/s11240-012-0198-6
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DOI: https://doi.org/10.1007/s11240-012-0198-6