Differential expression of rice calmodulin promoters in response to stimuli and developmental tissue in transgenic tobacco plants

Jung, Kim Yu; Kyung, Cho Eun; In, Lee Soo; Lim, Chae Oh; Ju, Choi Young

doi:10.5483/bmbrep.2010.43.1.009

BMB Reports

2010

DOI: 10.5483/bmbrep.2010.43.1.009

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Differential expression of rice calmodulin promoters in response to stimuli and developmental tissue in transgenic tobacco plants

Kim Yu Jung¹,

Cho Eun Kyung²,

Lee Soo In³

et al.

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Cited by 3 publications

References 30 publications

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Coupling calcium/calmodulin-mediated signaling and herbivore-induced plant response through calmodulin-binding transcription factor AtSR1/CAMTA3

Qiu

et al. 2012

Plant Mol Biol

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Calcium/calmodulin (Ca(2+)/CaM) has long been considered a crucial component in wound signaling pathway. However, very few Ca(2+)/CaM-binding proteins have been identified which regulate plant responses to herbivore attack/wounding stress. We have reported earlier that a family of Ca(2+)/CaM-binding transcription factors designated as AtSRs (also known as AtCAMTAs) can respond differentially to wounding stress. Further studies revealed that AtSR1/CAMTA3 is a negative regulator of plant defense, and Ca(2+)/CaM-binding to AtSR1 is indispensable for the suppression of salicylic acid (SA) accumulation and disease resistance. Here we report that Ca(2+)/CaM-binding is also critical for AtSR1-mediated herbivore-induced wound response. Interestingly, atsr1 mutant plants are more susceptible to herbivore attack than wild-type plants. Complementation of atsr1 mutant plants by overexpressing wild-type AtSR1 protein can effectively restore plant resistance to herbivore attack. However, when mutants of AtSR1 with impaired CaM-binding ability were overexpressed in atsr1 mutant plants, plant resistance to herbivore attack was not restored, suggesting a key role for Ca(2+)/CaM-binding in wound signaling. Furthermore, it was observed that elevated SA levels in atsr1 mutant plants have a negative impact on both basal and induced biosynthesis of jasmonates (JA). These results revealed that Ca(2+)/CaM-mediated signaling regulates plant response to herbivore attack/wounding by modulating the SA-JA crosstalk through AtSR1.

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Coupling calcium/calmodulin-mediated signaling and herbivore-induced plant response through calmodulin-binding transcription factor AtSR1/CAMTA3

Qiu

et al. 2012

Plant Mol Biol

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The Calmodulin-Binding Transcription Factor SIGNAL RESPONSIVE1 is a Novel Regulator of Glucosinolate Metabolism and Herbivory Tolerance in Arabidopsis

Laluk

Prasad

Savchenko

et al. 2012

Plant and Cell Physiology

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The Arabidopsis Ca(2+)/calmodulin (CaM)-binding transcription factor SIGNAL RESPONSIVE1 (AtSR1/CAMTA3) was previously identified as a key negative regulator of plant immune responses. Here, we report a new role for AtSR1 as a critical component of plant defense against insect herbivory. Loss of AtSR1 function impairs tolerance to feeding by the generalist herbivore Trichoplusia ni as well as wound-induced jasmonate accumulation. The susceptibility of the atsr1 mutant is associated with decreased total glucosinolate (GS) levels. The two key herbivory deterrents, indol-3-ylmethyl (I3M) and 4-methylsulfinylbutyl (4MSOB), showed the most significant reductions in atsr1 plants. Further, changes in AtSR1 transcript levels led to altered expression of several genes involved in GS metabolism including IQD1, MYB51 and AtST5a. Overall, our results establish AtSR1 as an important component of plant resistance to insect herbivory as well as one of only three described proteins involved in Ca(2+)/CaM-dependent signaling to function in the regulation of GS metabolism, providing a novel avenue for future investigations of plant-insect interactions.

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Abiotic stress responses in plants: roles of calmodulin-regulated proteins

2015

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Intracellular changes in calcium ions (Ca2+) in response to different biotic and abiotic stimuli are detected by various sensor proteins in the plant cell. Calmodulin (CaM) is one of the most extensively studied Ca2+-sensing proteins and has been shown to be involved in transduction of Ca2+ signals. After interacting with Ca2+, CaM undergoes conformational change and influences the activities of a diverse range of CaM-binding proteins. A number of CaM-binding proteins have also been implicated in stress responses in plants, highlighting the central role played by CaM in adaptation to adverse environmental conditions. Stress adaptation in plants is a highly complex and multigenic response. Identification and characterization of CaM-modulated proteins in relation to different abiotic stresses could, therefore, prove to be essential for a deeper understanding of the molecular mechanisms involved in abiotic stress tolerance in plants. Various studies have revealed involvement of CaM in regulation of metal ions uptake, generation of reactive oxygen species and modulation of transcription factors such as CAMTA3, GTL1, and WRKY39. Activities of several kinases and phosphatases have also been shown to be modulated by CaM, thus providing further versatility to stress-associated signal transduction pathways. The results obtained from contemporary studies are consistent with the proposed role of CaM as an integrator of different stress signaling pathways, which allows plants to maintain homeostasis between different cellular processes. In this review, we have attempted to present the current state of understanding of the role of CaM in modulating different stress-regulated proteins and its implications in augmenting abiotic stress tolerance in plants.

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Differential expression of rice calmodulin promoters in response to stimuli and developmental tissue in transgenic tobacco plants

Cited by 3 publications

References 30 publications

Coupling calcium/calmodulin-mediated signaling and herbivore-induced plant response through calmodulin-binding transcription factor AtSR1/CAMTA3

Coupling calcium/calmodulin-mediated signaling and herbivore-induced plant response through calmodulin-binding transcription factor AtSR1/CAMTA3

The Calmodulin-Binding Transcription Factor SIGNAL RESPONSIVE1 is a Novel Regulator of Glucosinolate Metabolism and Herbivory Tolerance in Arabidopsis

Abiotic stress responses in plants: roles of calmodulin-regulated proteins

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