scholarly journals A chloroplast retrograde signal, 3’-phosphoadenosine 5’-phosphate, acts as a secondary messenger in abscisic acid signaling in stomatal closure and germination

eLife ◽  
2017 ◽  
Vol 6 ◽  
Author(s):  
Wannarat Pornsiriwong ◽  
Gonzalo M Estavillo ◽  
Kai Xun Chan ◽  
Estee E Tee ◽  
Diep Ganguly ◽  
...  
Keyword(s):  
Gene Expression ◽  
Abscisic Acid ◽  
Seed Germination ◽  
Alternative Pathway ◽  
Stomatal Closure ◽  
Anion Channel ◽  
Aba Signaling ◽  
Calcium Dependent ◽  
Secondary Messenger ◽  
Signaling Components

Organelle-nuclear retrograde signaling regulates gene expression, but its roles in specialized cells and integration with hormonal signaling remain enigmatic. Here we show that the SAL1-PAP (3′-phosphoadenosine 5′- phosphate) retrograde pathway interacts with abscisic acid (ABA) signaling to regulate stomatal closure and seed germination in Arabidopsis. Genetically or exogenously manipulating PAP bypasses the canonical signaling components ABA Insensitive 1 (ABI1) and Open Stomata 1 (OST1); priming an alternative pathway that restores ABA-responsive gene expression, ROS bursts, ion channel function, stomatal closure and drought tolerance in ost1-2. PAP also inhibits wild type and abi1-1 seed germination by enhancing ABA sensitivity. PAP-XRN signaling interacts with ABA, ROS and Ca2+; up-regulating multiple ABA signaling components, including lowly-expressed Calcium Dependent Protein Kinases (CDPKs) capable of activating the anion channel SLAC1. Thus, PAP exhibits many secondary messenger attributes and exemplifies how retrograde signals can have broader roles in hormone signaling, allowing chloroplasts to fine-tune physiological responses.

scholarly journals Integration of Abscisic Acid Signaling with Other Signaling Pathways in Plant Stress Responses and Development

Plants ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 592 ◽  
Author(s):  
Manu Kumar ◽  
Mahipal Singh Kesawat ◽  
Asjad Ali ◽  
Sang-Choon Lee ◽  
Sarvajeet Singh Gill ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Seed Germination ◽  
Signaling Pathways ◽  
Stress Responses ◽  
Growth Regulation ◽  
Molecular Mechanisms ◽  
Stomatal Closure ◽  
Plant Stress ◽  
Aba Signaling ◽  
Complex Signaling

Plants are immobile and, to overcome harsh environmental conditions such as drought, salt, and cold, they have evolved complex signaling pathways. Abscisic acid (ABA), an isoprenoid phytohormone, is a critical signaling mediator that regulates diverse biological processes in various organisms. Significant progress has been made in the determination and characterization of key ABA-mediated molecular factors involved in different stress responses, including stomatal closure and developmental processes, such as seed germination and bud dormancy. Since ABA signaling is a complex signaling network that integrates with other signaling pathways, the dissection of its intricate regulatory network is necessary to understand the function of essential regulatory genes involved in ABA signaling. In the present review, we focus on two aspects of ABA signaling. First, we examine the perception of the stress signal (abiotic and biotic) and the response network of ABA signaling components that transduce the signal to the downstream pathway to respond to stress tolerance, regulation of stomata, and ABA signaling component ubiquitination. Second, ABA signaling in plant development processes, such as lateral root growth regulation, seed germination, and flowering time regulation is investigated. Examining such diverse signal integration dynamics could enhance our understanding of the underlying genetic, biochemical, and molecular mechanisms of ABA signaling networks in plants.

scholarly journals Integration of Abscisic Acid Signaling with Other Signaling Pathways in Plant Stress Responses and Development

2019 ◽  
Author(s):  
Manu Kumar ◽  
Mahipal Singh Kesawat ◽  
Asjad Ali ◽  
Sang-Choon Lee ◽  
Sarvajeet Singh Gill ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Seed Germination ◽  
Signaling Pathways ◽  
Stress Responses ◽  
Growth Regulation ◽  
Molecular Mechanisms ◽  
Stomatal Closure ◽  
Plant Stress ◽  
Aba Signaling ◽  
Complex Signaling

Plants are immobile, and, to overcome harsh environmental conditions, such as drought, salt, and cold, they have evolved complex signaling pathways. Abscisic acid (ABA), an isoprenoid phytohormone, is a critical signaling mediator that regulates diverse biological processes in various organisms. Significant progress has been made in the determination and characterization of key ABA-mediated molecular factors involved in different stress responses, including stomatal closure and developmental processes, such as seed germination and bud dormancy. Since ABA-signaling is a complex signaling network that integrates with other signaling pathways, the dissection of its intricate regulatory network is necessary to understand the function of essential regulatory genes involved in ABA signaling. In the present review, we focus on two aspects of ABA signaling. First, the perception of the stress signal (abiotic and biotic) and the response network of ABA-signaling components that transduce the signal to the downstream pathway to respond to stress tolerance, regulation of stomata, and ABA signaling component ubiquitination. Second, ABA-signaling in plant development processes, such as lateral root growth regulation, seed germination, and flowering time regulation. Examining such diverse signal integration dynamics could enhance our understanding of the underlying genetic, biochemical, and molecular mechanisms of ABA signaling networks in plants.

scholarly journals Arabidopsis CPK6 positively regulates ABA signaling and drought tolerance through phosphorylating ABA-responsive element-binding factors

2019 ◽  
Vol 71 (1) ◽  
pp. 188-203 ◽  
Author(s):  
Hanfeng Zhang ◽  
Daoyin Liu ◽  
Bo Yang ◽  
Wu-Zhen Liu ◽  
Bangbang Mu ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Protein Kinase ◽  
Seed Germination ◽  
Drought Tolerance ◽  
Aba Signaling ◽  
Dependent Protein Kinase ◽  
Calcium Dependent ◽  
Dependent Protein ◽  
Responsive Element ◽  
Calcium Dependent Protein Kinase

Arabidopsis calcium-dependent protein kinase CPK6 positively regulates seed germination, seedling growth, and drought tolerance via phosphorylating ABF and ABI5 transcription factors.

Stomatal Closure by Fast Abscisic Acid Signaling Is Mediated by the Guard Cell Anion Channel SLAH3 and the Receptor RCAR1

2011 ◽  
Vol 4 (173) ◽  
pp. ra32-ra32 ◽  
Author(s):  
D. Geiger ◽  
T. Maierhofer ◽  
K. A. S. AL-Rasheid ◽  
S. Scherzer ◽  
P. Mumm ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Guard Cell ◽  
Stomatal Closure ◽  
Anion Channel ◽  
Abscisic Acid Signaling
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