Heat shock response in tomato brassinosteroid mutants indicates that thermotolerance is independent of brassinosteroid homeostasis

Mazorra, L. M.; Holton, Nicholas; Bishop, Gerard J.; Núñez, Miriam

doi:10.1016/j.plaphy.2011.09.005

Cited by 54 publications

(41 citation statements)

References 37 publications

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“…In the experiment of Mazorra et al (2011), approximately 90% of the curl3 −abs seedlings survived high temperatures (< 30% of the wild type also survived), which is in line with the results obtained for our BR-signalling mutant BW312.…”

Section: High Temperature Tolerancesupporting

confidence: 89%

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Mutations in the HvDWARF, HvCPD and HvBRI1 Genes-Involved in Brassinosteroid Biosynthesis/Signalling: Altered Photosynthetic Efficiency, Hormonal Homeostasis and Tolerance to High/Low Temperatures in Barley

Sadura

Pociecha

Dziurka

et al. 2019

J Plant Growth Regul

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Brassinosteroids (BR) are steroid phytohormones that are involved in the growth and stress response in plants, but the precise mechanisms of their action are still being discovered. In our study we have used BR-deficient barley mutants 522DK and BW084 (which carry missense mutations in the HvDWARF and HvCPD genes, respectively). We have also used a BR-signalling mutant that harbors missense substitutions in the HvBRI1 gene. Our aim was (1) to find out if the content of phytohormones in the mutants grown at 20 °C is different than in the wild types and whether/how the content of phytohormones changes after plant acclimation at temperatures of 5 °C and 27 °C?, (2) to characterise the effectiveness of the light reactions of photosynthesis of the barley mutants in comparison to wild types at various temperatures, and (3) to verify the impact of mutations on the tolerance of barley to high and low temperatures. Hormonal characteristics of the BR mutants of barley show the complexity of the interactions between BR and other plant hormones that are additionally modified by temperature and possibly by other factors. The results suggest the participation of BR in auxin catabolism. Further, BR appears to play a role in maintaining the ABA-ABAGlc balance. As for the gibberellin content in plants at a temperature of 20 °C, more in-depth studies will be required to explain the contradictory effects regarding the accumulation of GA3, GA4 and GA5, which appears to be dependent on the type of mutation and connected to the BR level. A fast-kinetic chlorophyll a fluorescence analysis has revealed that the mutants had lower values of energy absorption than the wild types, but the values of the energy transferred via the electron-transport chain was maintained at the wild-type level. We presumed that BR are involved in regulating plant acclimation to extreme (low/high) temperatures, thus the BR-deficient and BR-signalling mutants should be less tolerant to low/high temperatures when compared to the wild types. Unexpectedly, all of the mutants showed a higher tolerance to high temperatures than the wild types. The BW084 and BW312 mutants were less tolerant to frost than the wild type, but 522DK had a similar frost tolerance as the reference wild-type cultivar.

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Section: High Temperature Tolerancesupporting

confidence: 89%

“…In an earlier experiment, Mazorra et al (2011) tested the effect of an elevated temperature (45 °C) on the tomato altered BR-sensitive mutant BR (curl3 −abs ) and an extreme dwarf mutant (d x ). The curl3 mutant is characterised as being BR insensitive (Koka et al 2000;Bishop 2003).…”

Section: High Temperature Tolerancementioning

confidence: 99%

Mutations in the HvDWARF, HvCPD and HvBRI1 Genes-Involved in Brassinosteroid Biosynthesis/Signalling: Altered Photosynthetic Efficiency, Hormonal Homeostasis and Tolerance to High/Low Temperatures in Barley

Sadura

Pociecha

Dziurka

et al. 2019

J Plant Growth Regul

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“…8b). Several recent studies have revealed that stress-inducible genes are constitutively upregulated in the BR-insensitive Arabidopsis mutant bri1 and that heat-shock-induced oxidative stress depends on BR levels in tomato (Kim et al , 2010; Mazorra et al , 2011). In the present study, we observed increases in Cu/Zn-SOD expression and SOD activity in d ^im plants, suggesting that BR deficiency may induce partial oxidative stress in plants.…”

Section: Discussionmentioning

confidence: 99%

H2O2 mediates the crosstalk of brassinosteroid and abscisic acid in tomato responses to heat and oxidative stresses

Zhou

Wang

et al. 2014

Journal of Experimental Botany

263

167

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“…BRs and related composites evoke antioxidant defense system and ultimately improve plant growth and metabolism in different plants exposed to both high [41] and low temperature [42]. Plant exposed to chilling stress BR reduce the ion outflow [43], whereas, 24-epiBL felicitate enzymatic activity (antioxidant) in grapevines exposed to chilled treatment [44].…”

Section: Temperature Stressmentioning

confidence: 99%

“…In detailed study, it was observed that EpiBL-treatment to tomato seedlings enhanced tolerance against heat shock (HS) by improving ionic leakage and enhancement defense system [41]. BR also alleviated low irradiances in Oryza sativa by enhancing soluble protein content as well as chlorophyll content.…”

Section: Low Temperaturementioning

confidence: 99%

Crosstalk of brassinosteroids with other phytohormones under various abiotic stresses

Ahmad¹,

Singh²,

Kamal³

2018

J App Biol Biotech

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Brassinosteroids (BRs) are the most important growth hormones which are steroidal in nature play crucially involved in growth and progressions of the plant. In recent years, advancements done in accessibility of biological possessions and approaches led to the most applicable mechanisms involved in BRs de novo synthesis, translocation and signaling pathways. The current researchers are also associated with the flexible roles of BRs. From the previous studies, it was manifest that BRs interaction with salicylic acid, abscisic acid, auxin, gibberellin, ethylene, cytokinin, and jasmonic acid in controlling numerous morphophysiological processes in plants. In this section, an effort is made to understand mysterious development and growth-linked either directly or not directly to BRs signaling and its intra-and interrelations with various phytohormones. This, in sequence, will support emerging extrapolative representations to moderate various valuable qualities in plants and address current encounters in agriculture.

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Heat shock response in tomato brassinosteroid mutants indicates that thermotolerance is independent of brassinosteroid homeostasis

Cited by 54 publications

References 37 publications

Mutations in the HvDWARF, HvCPD and HvBRI1 Genes-Involved in Brassinosteroid Biosynthesis/Signalling: Altered Photosynthetic Efficiency, Hormonal Homeostasis and Tolerance to High/Low Temperatures in Barley

Mutations in the HvDWARF, HvCPD and HvBRI1 Genes-Involved in Brassinosteroid Biosynthesis/Signalling: Altered Photosynthetic Efficiency, Hormonal Homeostasis and Tolerance to High/Low Temperatures in Barley

H2O2 mediates the crosstalk of brassinosteroid and abscisic acid in tomato responses to heat and oxidative stresses

Crosstalk of brassinosteroids with other phytohormones under various abiotic stresses

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