The Arabidopsis MYB96 Transcription Factor Mediates ABA-Dependent Triacylglycerol Accumulation in Vegetative Tissues under Drought Stress Conditions

Lee, Hong Gil; Park, Mid-Eum; Park, Bo Yeon; Kim, Hyun Uk; Seo, Pil Joon

doi:10.3390/plants8090296

Cited by 26 publications

(15 citation statements)

References 48 publications

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“…Various abiotic stresses, including cold, drought, salt, and osmotic stress, increased PDAT member expression and TAG accumulation in Camelina sativa ( Yuan et al, 2017 ). Multiple analyses and experiments have also shown that DGAT1 - and PDAT1 -mediated conversion of membrane lipids into TAGs was enhanced by abiotic stresses in both microalgae and Arabidopsis ( Yoon et al, 2012 ; Li et al, 2014 ; Lee et al, 2019 ). Based on this evidence, it is likely that ABA is capable of promoting the conversion of PLs to NLs in AM fungi in parallel with the collapse of arbuscules under abiotic stress.…”

Section: Abscisic Acid Regulationmentioning

confidence: 99%

Responses of Arbuscular Mycorrhizal Symbiosis to Abiotic Stress: A Lipid-Centric Perspective

2020

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Arbuscular mycorrhizal (AM) fungi are one of the most important soil microbial resources that help host plants cope with various abiotic stresses. Although a tremendous number of studies have revealed the responses of AM fungi to abiotic stress and their beneficial effects transferred to host plants, little work has focused on the role of lipid metabolism in AM fungi under abiotic stress conditions. AM fungi contain a large amount of lipids in their biomass, including phospholipids (PLs) in their hyphal membranes and neutral lipids (NLs) in their storage structures (e.g., vesicles and spores). Recently, lipid transfer from plants to AM fungi has been suggested to be indispensable for the establishment of AM symbiosis, and extraradical hyphae are capable of directly taking up lipids from the environment. This experimental evidence highlights the importance of lipids in AM symbiosis. Moreover, abiotic stress reduces lipid transfer to AM fungi and promotes arbuscule collapse as well as the hydrolysis and conversion of PLs to NLs in collapsed arbuscules. Overall, this knowledge encourages us to rethink the responses of AM symbiosis to abiotic stress from a lipid-centric perspective. The present review provides current and comprehensive knowledge on lipid metabolism in AM fungi, especially in response to various abiotic stresses. A regulatory role of abscisic acid (ABA), which is considered a “stress hormone,” in lipid metabolism and in the resulting consequences is also proposed.

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Section: Abscisic Acid Regulationmentioning

confidence: 99%

Responses of Arbuscular Mycorrhizal Symbiosis to Abiotic Stress: A Lipid-Centric Perspective

2020

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“…Though TAG typically does not accumulate to substantial levels in vegetative tissues under non-limiting growth conditions, various stress conditions such as drought [36], high or low temperature, and nutrient starvation [37] can induce its production, especially in leaves. This has been attributed to the up-regulation of several key genes involved in TAG biosynthesis.…”

Section: Induction Of Tag Accumulation Under Stress Conditionsmentioning

confidence: 99%

The Role of Triacylglycerol in Plant Stress Response

Wang

et al. 2020

Plants

102

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Vegetable oil is mainly composed of triacylglycerol (TAG), a storage lipid that serves as a major commodity for food and industrial purposes, as well as an alternative biofuel source. While TAG is typically not produced at significant levels in vegetative tissues, emerging evidence suggests that its accumulation in such tissues may provide one mechanism by which plants cope with abiotic stress. Different types of abiotic stress induce lipid remodeling through the action of specific lipases, which results in various alterations in membrane lipid composition. This response induces the formation of toxic lipid intermediates that cause membrane damage or cell death. However, increased levels of TAG under stress conditions are believed to function, at least in part, as a means of sequestering these toxic lipid intermediates. Moreover, the lipid droplets (LDs) in which TAG is enclosed also function as a subcellular factory to provide binding sites and substrates for the biosynthesis of bioactive compounds that protect against insects and fungi. Though our knowledge concerning the role of TAG in stress tolerance is expanding, many gaps in our understanding of the mechanisms driving these processes are still evident. In this review, we highlight progress that has been made to decipher the role of TAG in plant stress response, and we discuss possible ways in which this information could be utilized to improve crops in the future.

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“…Lee et al [28] suggested that the MYB96 transcription factor not only regulates the oil content during seed development [7], but also controls the synthesis of TAG in drought stress in vegetative tissue leaves. TAG accumulation was very high in Arabidopsis seedlings where MYB96 was constitutively overexpressed.…”

Section: Highlight Of Special Issuesmentioning

confidence: 99%

Lipid Metabolism in Plants

Kim

2020

Plants

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In plants, lipids function in a variety of ways. Lipids are a major component of biological membranes and are used as a compact energy source for seed germination. Fatty acids, the major lipids in plants, are synthesized in plastid and assembled by glycerolipids or triacylglycerols in endoplasmic reticulum. The metabolism of fatty acids and triacylglycerols is well studied in most Arabidopsis model plants by forward and reverse genetics methods. However, research on the diverse functions of lipids in plants, including various crops, has yet to be completed. The papers of this Special Issue cover the core of the field of plant lipid research on the role of galactolipids in the chloroplast biogenesis from etioplasts and the role of acyltransferases and transcription factors involved in fatty acid and triacylglycerol synthesis. This information will contribute to the expansion of plant lipid research.

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The Arabidopsis MYB96 Transcription Factor Mediates ABA-Dependent Triacylglycerol Accumulation in Vegetative Tissues under Drought Stress Conditions

Cited by 26 publications

References 48 publications

Responses of Arbuscular Mycorrhizal Symbiosis to Abiotic Stress: A Lipid-Centric Perspective

Responses of Arbuscular Mycorrhizal Symbiosis to Abiotic Stress: A Lipid-Centric Perspective

The Role of Triacylglycerol in Plant Stress Response

Lipid Metabolism in Plants

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