Heat perception and signalling in plants: a tortuous path to thermotolerance

Saidi, Younousse; Finka, Andrija; Goloubinoff, Pierre

doi:10.1111/j.1469-8137.2010.03571.x

Cited by 220 publications

(186 citation statements)

References 62 publications

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“…A similar scenario was recently found in tomato leaves in which over-expression of a CWIN gene did not affect leaf hexose content but increased the levels of Glc-6-P and Fru-6-P, leading to a delay in leaf senescence under drought (Albacete et al, 2015). Hsfs and Hsps play important roles in the heat response of plants through preventing the misfolding of protein and regulating the intracellular transport and degradation of proteins (Vierling, 1991;Saidi et al, 2011;Hahn et al, 2011). For example, cosuppression of HsfA1 in tomato led to extreme sensitivity of plants and fruits to elevated temperatures (Mishra et al, 2002).…”

Section: Elevated Cwin Activity Enhances Tomato Fruit Set Under Lmhsmentioning

confidence: 83%

“…Heat stress transcription factors (Hsfs) and heat shock proteins (Hsps) are central in conferring heat tolerance (Saidi et al, 2011;Hahn et al, 2011). Previous studies in tomato have identified three Hsf genes (HsfA1, HsfA2, and HsfB1) and four Hsp genes (Hsp100, Hsp90, Hsp70, and HspII17.6) that play important roles in heat stress response (Mishra et al, 2002;ChanSchaminet et al, 2009;Giorno et al, 2010;Hahn et al, 2011;Li et al, 2012).…”

Section: Cwin-elevated Transgenic Tomato Exhibited a Sustained Or Incmentioning

confidence: 99%

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Cell Wall Invertase Promotes Fruit Set under Heat Stress by Suppressing ROS-Independent Cell Death

2016

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Reduced cell wall invertase (CWIN) activity has been shown to be associated with poor seed and fruit set under abiotic stress. Here, we examined whether genetically increasing native CWIN activity would sustain fruit set under long-term moderate heat stress (LMHS), an important factor limiting crop production, by using transgenic tomato (Solanum lycopersicum) with its CWIN inhibitor gene silenced and focusing on ovaries and fruits at 2 d before and after pollination, respectively. We found that the increase of CWIN activity suppressed LMHS-induced programmed cell death in fruits. Surprisingly, measurement of the contents of H 2 O 2 and malondialdehyde and the activities of a cohort of antioxidant enzymes revealed that the CWINmediated inhibition on programmed cell death is exerted in a reactive oxygen species-independent manner. Elevation of CWIN activity sustained Suc import into fruits and increased activities of hexokinase and fructokinase in the ovaries in response to LMHS. Compared to the wild type, the CWIN-elevated transgenic plants exhibited higher transcript levels of heat shock protein genes Hsp90 and Hsp100 in ovaries and HspII17.6 in fruits under LMHS, which corresponded to a lower transcript level of a negative auxin responsive factor IAA9 but a higher expression of the auxin biosynthesis gene ToFZY6 in fruits at 2 d after pollination. Collectively, the data indicate that CWIN enhances fruit set under LMHS through suppression of programmed cell death in a reactive oxygen species-independent manner that could involve enhanced Suc import and catabolism, HSP expression, and auxin response and biosynthesis.

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Section: Elevated Cwin Activity Enhances Tomato Fruit Set Under Lmhsmentioning

confidence: 83%

Section: Cwin-elevated Transgenic Tomato Exhibited a Sustained Or Incmentioning

confidence: 99%

Cell Wall Invertase Promotes Fruit Set under Heat Stress by Suppressing ROS-Independent Cell Death

2016

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“…As argued by researchers, the basic discovery could ultimately establish to have vital implications for world food security [11]. However, Saidi et al [12] were of the opinion that when temperature elevates, the heat signal is probably transduced by several pathways for coming together into the final activation of HSFs, the expression of HSPs and the onset of cellular thermotolerance.…”

Section: Heat Sensing By Plantsmentioning

confidence: 99%

Heat Stress Responses and Thermotolerance

Hemantaranjan¹,

Bhanu²,

Singh³

et al. 2014

APAR

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climate change is that most agricultural regions will experience additional extreme environmental fluctuations [2]. Direct injuries due to high temperatures include protein denaturation and aggregation and increased fluidity of membrane lipids. Indirect or slower heat injuries include inactivation of enzymes in chloroplast and mitochondria, inhibition of protein synthesis, protein degradation and loss of membrane integrity [3]. Heat stress also affects the organization of microtubules by splitting and/or elongation of spindles, formation of microtubule asters in mitotic cells and elongation of phragmoplast microtubules [4].The unfavourable effects of heat stress can be mitigated by developing crop plants with improved thermotolerance using an assortment of genetic approaches. For this reason, a thorough understanding of physiological responses of plants to high temperature, mechanisms of heat tolerance and possible strategies for improving crop thermotolerance is crucial. Acquiring thermotolerance is a lively progression by which considerable amounts of plant resources are diverted to structural and functional maintenance to escape damages caused by heat stress. Although biochemical and molecular aspects of thermotolerance in plants are relatively well understood, additional studies focused on phenotypic flexibility and assimilate partitioning under heat stress and factors modulating crop heat tolerance are imperative. High temperature during seed germination may slow down or totally inhibit germination, depending on plant species and the intensity of the stress [5]. At later stages, high IntroductionFuture global climate change, with predicted 1.5-5.8 °C increases in temperatures by 2100 has to cause heat stress to create threats to agricultural production [1]. An increase in global temperature ranging from 1.1 to 6.4 °C depending on global emissions scenarios, will accompany the rises in atmospheric CO 2 . Though high temperature and other abiotic stresses are clearly limiting factors for crops cultivated on marginal lands, crop productivity far and wide is often at the mercy of random environmental fluctuations. Existing assumption about global Heat Stress Responses and Thermotolerance AbstractThe rising ambient temperature by plant cells is crucial for the timely activation of various molecular defences before the appearance of heat damage. The heat-threshold level varies considerably at different developmental stages. With a view to survive under heat stress, mechanisms of regulation at the molecular level enable plants to prosper. Traditional breeding contributed for improving heat tolerance meagrely. The genetic transformation approach needs to be accelerated that can mitigate harmful effects by developing improved thermotolerance of crop plants. In this background, a thorough understanding of physiological responses of plants to high temperature, mechanisms of heat tolerance and possible strategies is vital. Temperature changes are sensed through cellular responses due to signal transduction into the c...

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“…Among these stress factors, high temperature is a major abiotic factor affects metabolism, growth, development, reproduction, yield, and even survival of plants including crop plants like maize (Zea mays L.) (Li & Gong 2011;Saidi et al 2011;Mittler et al 2012;Wu et al 2012;Grover et al 2013;Piterková et al 2013). In crop plants, maize not only is a new model plant, but also the third most important food grain crop after wheat and rice, and heat stress is the principal cause of maize failure worldwide, global warming accentuates this problem (Leipner & Stamp 2009;Strable & Scanlon 2009).…”

Section: Introductionmentioning

confidence: 99%

“…In crop plants, maize not only is a new model plant, but also the third most important food grain crop after wheat and rice, and heat stress is the principal cause of maize failure worldwide, global warming accentuates this problem (Leipner & Stamp 2009;Strable & Scanlon 2009). Numerous studies have clearly illustrated high temperature stress commonly leads to oxidative stress as result of peroxidation of membrane lipids, degradation of proteins, inactivation of enzymes, DNA damage, etc., (Saidi et al 2011;Mittler et al 2012;Wu et al 2012;Grover et al 2013;Piterková et al 2013;Tari et al 2013). The degree of oxidative stress is determined by the level of reactive oxygen species (ROS) such as superoxide radical (O .…”

Section: Introductionmentioning

confidence: 99%

Effect of pretreatment with hydrogen sulfide donor sodium hydrosulfide on heat tolerance in relation to antioxidant system in maize (Zea mays) seedlings

2014

Biologia

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Hydrogen sulfide (H2S) is a signal molecule that is involved in plant growth, development and the acquisition of stress tolerance including heat tolerance, but the mechanism of H2S-induced heat tolerance is not completely clear. In present study, the effect of sodium hydrosulfide (NaHS), a H2S donor, treatment on heat tolerance of maize seedlings in relation to antioxidant system was investigated. The results showed that NaHS treatment improved survival percentage of maize seedlings under heat stress in a concentration-dependent manner, indicating that H2S treatment could improve heat tolerance of maize seedlings. To further study mechanism of NaHS-induced heat tolerance, catalase (CAT), guaiacol peroxidase (GPX), superoxide dismutase (SOD), glutathione reductase (GR) and ascorbate peroxidase (APX) activities, and glutathione (GSH) and ascorbic acid (AsA) contents in maize seedlings were determined. The results showed that NaHS treatment increased the activities of CAT, GPX, SOD and GR, and GSH and AsA contents as well as the ratio of reduced antioxidants to total antioxidants [AsA/(AsA+DHA) and GSH/(GSH +GSSG)] in maize seedlings under normal culture conditions compared with the control. Under heat stress, antioxidant enzymes activities, antioxidants contents and the ratio of the reduced antioxidants to total antioxidants in control and treated seedlings all decreased, but NaHS-treated seedlings maintained higher antioxidant enzymes activities and antioxidants levels as well as the ratio of reduced antioxidants to total antioxidants. All of above-mentioned results suggested that NaHS treatment could improve heat tolerance of maize seedlings, and the acquisition of this heat tolerance may be relation to enhanced antioxidant system activity.

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Heat perception and signalling in plants: a tortuous path to thermotolerance

Cited by 220 publications

References 62 publications

Cell Wall Invertase Promotes Fruit Set under Heat Stress by Suppressing ROS-Independent Cell Death

Cell Wall Invertase Promotes Fruit Set under Heat Stress by Suppressing ROS-Independent Cell Death

Heat Stress Responses and Thermotolerance

Effect of pretreatment with hydrogen sulfide donor sodium hydrosulfide on heat tolerance in relation to antioxidant system in maize (Zea mays) seedlings

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