Stomatal regulation: Role of H2S-induced persulfidation in ABA signaling

2021 ◽  
Author(s):  
Anna Siodmak ◽  
Heribert Hirt
Keyword(s):  
Aba Signaling ◽  
Stomatal Regulation

scholarly journals Auxin: Hormonal Signal Required for Seed Development and Dormancy

Plants ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 705 ◽  
Author(s):  
Angel J. Matilla
Keyword(s):  
Seed Development ◽  
Higher Plants ◽  
Aba Signaling ◽  
Seed Formation ◽  
Cellular Processes ◽  
Primary Dormancy ◽  
Cellular Machinery ◽  
Hormonal Signal ◽  
Viable Seeds

The production of viable seeds is a key event in the life cycle of higher plants. Historically, abscisic acid (ABA) and gibberellin (GAs) were considered the main hormones that regulate seed formation. However, auxin has recently emerged as an essential player that modulates, in conjunction with ABA, different cellular processes involved in seed development as well as the induction, regulation and maintenance of primary dormancy (PD). This review examines and discusses the key role of auxin as a signaling molecule that coordinates seed life. The cellular machinery involved in the synthesis and transport of auxin, as well as their cellular and tissue compartmentalization, is crucial for the development of the endosperm and seed-coat. Thus, auxin is an essential compound involved in integuments development, and its transport from endosperm is regulated by AGAMOUS-LIKE62 (AGL62) whose transcript is specifically expressed in the endosperm. In addition, recent biochemical and genetic evidence supports the involvement of auxins in PD. In this process, the participation of the transcriptional regulator ABA INSENSITIVE3 (ABI3) is critical, revealing a cross-talk between auxin and ABA signaling. Future experimental aimed at advancing knowledge of the role of auxins in seed development and PD are also discussed.

scholarly journals Ethylene regulates post-germination seedling growth in wheat through spatial and temporal modulation of ABA/GA balance

2019 ◽  
Vol 71 (6) ◽  
pp. 1985-2004 ◽  
Author(s):  
Menghan Sun ◽  
Pham Anh Tuan ◽  
Marta S Izydorczyk ◽  
Belay T Ayele
Keyword(s):  
Transcriptional Regulation ◽  
Seedling Growth ◽  
Molecular Mechanisms ◽  
Starch Degradation ◽  
Aba Signaling ◽  
Temporal Modulation ◽  
Aba Metabolism ◽  
Radicle Protrusion ◽  
Storage Starch

Abstract This study aimed to gain insights into the molecular mechanisms underlying the role of ethylene in regulating germination and seedling growth in wheat by combining pharmacological, molecular, and metabolomics approaches. Our study showed that ethylene does not affect radicle protrusion but controls post-germination endospermic starch degradation through transcriptional regulation of specific α-amylase and α-glucosidase genes, and this effect is mediated by alteration of endospermic bioactive gibberellin (GA) levels, and GA sensitivity via expression of the GA signaling gene, TaGAMYB. Our data implicated ethylene as a positive regulator of embryo axis and coleoptile growth through transcriptional regulation of specific TaEXPA genes. These effects were associated with modulation of GA levels and sensitivity, through expression of GA metabolism (TaGA20ox1, TaGA3ox2, and TaGA2ox6) and signaling (TaGAMYB) genes, respectively, and/or the abscisic acid (ABA) level and sensitivity, via expression of specific ABA metabolism (TaNCED2 or TaCYP707A1) and signaling (TaABI3) genes, respectively. Ethylene appeared to regulate the expression of TaEXPA3 and thereby root growth through its control of coleoptile ABA metabolism, and root ABA signaling via expression of TaABI3 and TaABI5. These results show that spatiotemporal modulation of ABA/GA balance mediates the role of ethylene in regulating post-germination storage starch degradation and seedling growth in wheat.

scholarly journals Control of ABA Signaling and Crosstalk With Other Hormones by Selective Degradation of Pathway Components

2021 ◽  
Author(s):  
Agnieszka Sirko ◽  
Anna Wawrzyńska ◽  
Jerzy Brzywczy ◽  
Marzena Sieńko
Keyword(s):  
Abscisic Acid ◽  
Signaling Pathway ◽  
Plant Hormone ◽  
Aba Signaling ◽  
Degradation Mechanisms ◽  
E3 Ligases ◽  
Selective Autophagy ◽  
Selective Degradation ◽  
Different Parts

A rapid and appropriate genetic and metabolic acclimation, which is crucial for plants’ survival in a changing environment, is maintained due to the coordinated action of plant hormones and cellular degradation mechanisms influencing proteostasis. The plant hormone abscisic acid (ABA) rapidly accumulates in plants in response to environmental stress and plays a pivotal role in the reaction to various stimuli. Increasing evidence demonstrates a significant role of autophagy in controlling ABA signaling. This field has been extensively investigated and new discoveries are constantly being provided. We present updated information on the components of the ABA signaling pathway, particularly on transcription factors modified by different E3 ligases. Then, we focus on the role of selective autophagy in ABA pathway control and review novel evidence on the involvement of autophagy in different parts of the ABA signaling pathway that are important for crosstalk with other hormones, particularly cytokinins and brassinosteroids.

scholarly journals Role of ABA Signaling in Regulation of Stem Sugar Metabolism and Transport under Post- Flowering Drought Stress in Sweet Sorghum

2019 ◽  
Vol 37 (4) ◽  
pp. 303-313 ◽  
Author(s):  
Tejashree Ghate ◽  
Vitthal Barvkar ◽  
Santosh Deshpande ◽  
Sujata Bhargava
Keyword(s):  
Drought Stress ◽  
Sweet Sorghum ◽  
Sugar Metabolism ◽  
Aba Signaling

scholarly journals Revisiting the Role of Ethylene and N-End Rule Pathway on Chilling-Induced Dormancy Release in Arabidopsis Seeds

2018 ◽  
Vol 19 (11) ◽  
pp. 3577 ◽  
Author(s):  
Xu Wang ◽  
Zhazira Yesbergenova-Cuny ◽  
Catherine Biniek ◽  
Christophe Bailly ◽  
Hayat El-Maarouf-Bouteau ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Signaling Pathway ◽  
Dormancy Release ◽  
Ethylene Signaling ◽  
Aba Signaling ◽  
Wild Type ◽  
Ethylene Signaling Pathway

Dormant Arabidopsis (Arabidopsis thaliana) seeds do not germinate easily at temperatures higher than 10–15 °C. Using mutants affected in ethylene signaling (etr1, ein2 and ein4) and in the N-end-rule pathway of the proteolysis (prt6 and ate1-ate2) we have investigated the effects of cold and ethylene on dormancy alleviation. Ethylene (10–100 ppm) and 2–4 days chilling (4 °C) strongly stimulate the germination of wild type (Col-0) seeds at 25 °C. Two to four days of chilling promote the germination at 25 °C of all the mutants suggesting that release of dormancy by cold did not require ethylene and did not require the N-end-rule pathway. One mutant (etr1) that did not respond to ethylene did not respond to GA3 either. Mutants affected in the N-end rule (prt6 and ate1-ate2) did not respond to ethylene indicating that also this pathway is required for dormancy alleviation by ethylene; they germinated after chilling and in the presence of GA3. Cold can activate the ethylene signaling pathway since it induced an accumulation of ETR1, EINI4, and EIN2 transcripts, the expression of which was not affected by ethylene and GA3. Both cold followed by 10 h at 25 °C and ethylene downregulated the expression of PRT6, ATE1, ATE2, and of ABI5 involved in ABA signaling as compared to dormant seeds incubated at 25 °C. In opposite, the expression of RGA, GAI, and RGL2 encoding three DELLAs was induced at 4 °C but downregulated in the presence of ethylene.

scholarly journals RAP2.3 negatively regulates nitric oxide biosynthesis and related responses through a rheostat-like mechanism in Arabidopsis

2020 ◽  
Vol 71 (10) ◽  
pp. 3157-3171 ◽  
Author(s):  
José León ◽  
Álvaro Costa-Broseta ◽  
Mari Cruz Castillo
Keyword(s):  
Nitric Oxide ◽  
Root Elongation ◽  
Guard Cells ◽  
No Production ◽  
Aba Signaling ◽  
Inhibition Of Growth ◽  
Genome Wide ◽  
Molecular Rheostat ◽  
No Signaling

Abstract Nitric oxide (NO) is sensed through a mechanism involving the degradation of group-VII ERF transcription factors (ERFVIIs) that is mediated by the N-degron pathway. However, the mechanisms regulating NO homeostasis and downstream responses remain mostly unknown. To explore the role of ERFVIIs in regulating NO production and signaling, genome-wide transcriptome analyses were performed on single and multiple erfvii mutants of Arabidopsis following exposure to NO. Transgenic plants overexpressing degradable or non-degradable versions of RAP2.3, one of the five ERFVIIs, were also examined. Enhanced RAP2.3 expression attenuated the changes in the transcriptome upon exposure to NO, and thereby acted as a brake for NO-triggered responses that included the activation of jasmonate and ABA signaling. The expression of non-degradable RAP2.3 attenuated NO biosynthesis in shoots but not in roots, and released the NO-triggered inhibition of hypocotyl and root elongation. In the guard cells of stomata, the control of NO accumulation depended on PRT6-triggered degradation of RAP2.3 more than on RAP2.3 levels. RAP2.3 therefore seemed to work as a molecular rheostat controlling NO homeostasis and signaling. Its function as a brake for NO signaling was released upon NO-triggered PRT6-mediated degradation, thus allowing the inhibition of growth, and the potentiation of jasmonate- and ABA-related signaling.

scholarly journals Role of PP2C-mediated ABA signaling in the mossPhyscomitrella patens

2009 ◽  
Vol 4 (9) ◽  
pp. 887-889 ◽  
Author(s):  
Yoichi Sakata ◽  
Kenji Komatsu ◽  
Teruaki Taji ◽  
Shigeo Tanaka
Keyword(s):  
Aba Signaling

scholarly journals Control of ABA Signaling and Crosstalk with Other Hormones by the Selective Degradation of Pathway Components

2021 ◽  
Vol 22 (9) ◽  
pp. 4638
Author(s):  
Agnieszka Sirko ◽  
Anna Wawrzyńska ◽  
Jerzy Brzywczy ◽  
Marzena Sieńko
Keyword(s):  
Abscisic Acid ◽  
Signaling Pathway ◽  
Plant Hormone ◽  
Aba Signaling ◽  
Degradation Mechanisms ◽  
E3 Ligases ◽  
Selective Autophagy ◽  
Selective Degradation ◽  
Different Parts

A rapid and appropriate genetic and metabolic acclimation, which is crucial for plants’ survival in a changing environment, is maintained due to the coordinated action of plant hormones and cellular degradation mechanisms influencing proteostasis. The plant hormone abscisic acid (ABA) rapidly accumulates in plants in response to environmental stress and plays a pivotal role in the reaction to various stimuli. Increasing evidence demonstrates a significant role of autophagy in controlling ABA signaling. This field has been extensively investigated and new discoveries are constantly being provided. We present updated information on the components of the ABA signaling pathway, particularly on transcription factors modified by different E3 ligases. Then, we focus on the role of selective autophagy in ABA pathway control and review novel evidence on the involvement of autophagy in different parts of the ABA signaling pathway that are important for crosstalk with other hormones, particularly cytokinins and brassinosteroids.

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