FASCICLIN LIKE ARABINOGALACTAN PROTEIN 4 and RESPIRATORY BURST OXIDASE HOMOLOG D and F independently modulate abscisic acid signaling

Xue, Hui; Seifert, Georg

doi:10.4161/15592324.2014.989064

Cited by 17 publications

(15 citation statements)

References 15 publications

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“…Such elevated ROS levels lead to the cross-linking of Hyp-rich glycoproteins and callose deposition in the cell wall, both of which may contribute to reduced cell expansion [ 70 ]. Related to this, Xue and Seifert [ 71 ] demonstrated that sos5 mutants indeed exhibit production of higher levels of ROS compared to WT plants.…”

Section: Discussionmentioning

confidence: 84%

Glycosylation of a Fasciclin-Like Arabinogalactan-Protein (SOS5) Mediates Root Growth and Seed Mucilage Adherence via a Cell Wall Receptor-Like Kinase (FEI1/FEI2) Pathway in Arabidopsis

et al. 2016

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Fundamental processes that underpin plant growth and development depend crucially on the action and assembly of the cell wall, a dynamic structure that changes in response to both developmental and environmental cues. While much is known about cell wall structure and biosynthesis, much less is known about the functions of the individual wall components, particularly with respect to their potential roles in cellular signaling. Loss-of-function mutants of two arabinogalactan-protein (AGP)-specific galactosyltransferases namely, GALT2 and GALT5, confer pleiotropic growth and development phenotypes indicating the important contributions of carbohydrate moieties towards AGP function. Notably, galt2galt5 double mutants displayed impaired root growth and root tip swelling in response to salt, likely as a result of decreased cellulose synthesis. These mutants phenocopy a salt-overly sensitive mutant called sos5, which lacks a fasciclin-like AGP (SOS5/FLA4) as well as a fei1fei2 double mutant, which lacks two cell wall-associated leucine-rich repeat receptor-like kinases. Additionally, galt2gal5 as well as sos5 and fei2 showed reduced seed mucilage adherence. Quintuple galt2galt5sos5fei1fei2 mutants were produced and provided evidence that these genes act in a single, linear genetic pathway. Further genetic and biochemical analysis of the quintuple mutant demonstrated involvement of these genes with the interplay between cellulose biosynthesis and two plant growth regulators, ethylene and ABA, in modulating root cell wall integrity.

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Section: Discussionmentioning

confidence: 84%

Glycosylation of a Fasciclin-Like Arabinogalactan-Protein (SOS5) Mediates Root Growth and Seed Mucilage Adherence via a Cell Wall Receptor-Like Kinase (FEI1/FEI2) Pathway in Arabidopsis

et al. 2016

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“…This has since been negated, as cesa5 and sos5 have clearly different phenotypes with cellulose production apparently unaffected in sos5 ( Griffiths et al, 2014 ). More recently, SOS5 was proposed to function in signaling pathways that mediate cell expansion ( Seifert et al, 2014 ; Xue and Seifert, 2015 ). Determining the precise mechanism of SOS5 function is, therefore, proving to be difficult.…”

Section: Discussionmentioning

confidence: 99%

“…Both SOS5 and FEI2 have been linked to hormone signaling, either through auxin, ethylene, or abscisic acid ( Xu et al, 2008 ; Seifert et al, 2014 ; Steinwand et al, 2014 ; Xue and Seifert, 2015 ). A role in cell wall recognition and signaling remain the primary hypothesis explaining the function of FEI2, although the modified mucilage partitioning observed in sos5 and fei2 is unconditional, unlike in roots where high salt concentrations are required for the phenotype to be observed.…”

Section: Discussionmentioning

confidence: 99%

Dissecting Seed Mucilage Adherence Mediated by FEI2 and SOS5

et al. 2016

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The plant cell wall is held together by the interactions between four major components: cellulose, pectin, hemicellulose, and proteins. Mucilage is a powerful model system to study the interactions between these components as it is formed of polysaccharides that are deposited in the apoplast of seed coat epidermal cells during seed development. When seeds are hydrated, these polysaccharides expand rapidly out of the apoplastic pocket, and form an adherent halo of mucilage around the seed. In Arabidopsis, mutations in multiple genes have similar loss of mucilage adherence phenotypes including CELLULOSE SYNTHASE 5 (CESA5)/MUCILAGE-MODIFIED 3 (MUM3), MUM5/MUCI21, SALT-OVERLY SENSITIVE 5 (SOS5), and FEI2. Here, we examine the interactions between these factors to better understand how they participate to control mucilage adherence. Double mutant phenotypes indicated that MUM5 and CESA5 function in a common mechanism that adheres pectin to the seed through the biosynthesis of cellulose and xylan, whereas SOS5 and FEI2, encoding a fasciclin-like arabinogalactan protein or a receptor-like kinase, respectively, function through an independent pathway. Cytological analyses of mucilage indicates that heteromannans are associated with cellulose, and not in the pathway involving SOS5 or FEI2. A SOS5 fluorescent protein fusion (SOS5-mCITRINE) was localized throughout the mucilage pocket, consistent with a structural role in pectin adhesion. The relationship between SOS5 and FEI2 mediated mucilage adherence was examined in more detail and while sos5 and fei2 mutants show similar phenotypes, key differences in the macromolecular characteristics and amounts of mucilage polymers were observed. FEI2 thus appears to have additional, as well as overlapping functions, with SOS5. Given that FEI2 is required for SOS5 function, we propose that FEI2 serves to localize SOS5 at the plasma membrane where it establishes interactions with mucilage polysaccharides, notably pectins, required for mucilage adherence prior to SOS5 being released into the apoplast.

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“…Regarding the involvement of Rboh in abiotic interactions, it was reported that the Arabidopsis RbohD gene is involved in ROS-inducing a rapid systemic signal during various stress factors, such as heat, cold, high light, and salinity ( Miller et al, 2009 ). The abiotic stress-mediating phytohormone ABA was reported to be regulated by the action of RbohD and RbohF in different ROS-ABA signaling pathways ( Kwak et al, 2003 ; Joo et al, 2005 ; Xue and Seifert, 2015 ). In a microarray experiment, RbohD expression was downregulated by ABA treatment but upregulated by H 2 O 2 treatment in Arabidopsis ( Barraud et al, 2006 ).…”

Section: Reactive Oxygen Species At the Cross-roadmentioning

confidence: 99%

Global Plant Stress Signaling: Reactive Oxygen Species at the Cross-Road

2016

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Current technologies have changed biology into a data-intensive field and significantly increased our understanding of signal transduction pathways in plants. However, global defense signaling networks in plants have not been established yet. Considering the apparent intricate nature of signaling mechanisms in plants (due to their sessile nature), studying the points at which different signaling pathways converge, rather than the branches, represents a good start to unravel global plant signaling networks. In this regard, growing evidence shows that the generation of reactive oxygen species (ROS) is one of the most common plant responses to different stresses, representing a point at which various signaling pathways come together. In this review, the complex nature of plant stress signaling networks will be discussed. An emphasis on different signaling players with a specific attention to ROS as the primary source of the signaling battery in plants will be presented. The interactions between ROS and other signaling components, e.g., calcium, redox homeostasis, membranes, G-proteins, MAPKs, plant hormones, and transcription factors will be assessed. A better understanding of the vital roles ROS are playing in plant signaling would help innovate new strategies to improve plant productivity under the circumstances of the increasing severity of environmental conditions and the high demand of food and energy worldwide.

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FASCICLIN LIKE ARABINOGALACTAN PROTEIN 4 and RESPIRATORY BURST OXIDASE HOMOLOG D and F independently modulate abscisic acid signaling

Cited by 17 publications

References 15 publications

Glycosylation of a Fasciclin-Like Arabinogalactan-Protein (SOS5) Mediates Root Growth and Seed Mucilage Adherence via a Cell Wall Receptor-Like Kinase (FEI1/FEI2) Pathway in Arabidopsis

Glycosylation of a Fasciclin-Like Arabinogalactan-Protein (SOS5) Mediates Root Growth and Seed Mucilage Adherence via a Cell Wall Receptor-Like Kinase (FEI1/FEI2) Pathway in Arabidopsis

Dissecting Seed Mucilage Adherence Mediated by FEI2 and SOS5

Global Plant Stress Signaling: Reactive Oxygen Species at the Cross-Road

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