New cross talk between ROS, ABA and auxin controlling seed maturation and germination unraveled in APX6 deficient Arabidopsis seeds

Chen, Changming; Twito, Shir; Miller, Gad

doi:10.4161/15592324.2014.976489

Cited by 32 publications

(19 citation statements)

References 25 publications

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“…1A). In agreement with their putative roles as ABI5 repressors, the expression of two transcription factors that bind the ABI5 promoter, WRKY40 and HY5 , Chen et al 2014, was down-regulated by ABA in the WT plants under Cu sufficiency (Fig. 7A).…”

Section: Discussionmentioning

confidence: 49%

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Interaction Between ABA Signaling and Copper Homeostasis inArabidopsis thaliana

et al. 2016

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ABA is involved in plant responses to non-optimal environmental conditions, including nutrient availability. Since copper (Cu) is a very important micronutrient, unraveling how ABA affects Cu uptake and distribution is relevant to ensure adequate Cu nutrition in plants subjected to stress conditions. Inversely, knowledge about how the plant nutritional status can interfere with ABA biosynthesis and signaling mechanisms is necessary to optimize stress tolerance in horticultural crops. Here the reciprocal influence between ABA and Cu content was addressed by using knockout mutants and overexpressing transgenic plants of high affinity plasma membrane Cu transporters (pmCOPT) with altered Cu uptake. Exogenous ABA inhibited pmCOPT expression and drastically modified COPT2-driven localization in roots. ABA regulated SPL7, the main transcription factor responsive for Cu deficiency responses, and subsequently affected expression of its targets. ABA biosynthesis (aba2) and signaling (hab1-1 abi1-2) mutants differentially responded to ABA according to Cu levels. Alteration of Cu homeostasis in the pmCOPT mutants affected ABA biosynthesis, transport and signaling as genes such as NCED3, WRKY40, HY5 and ABI5 were differentially modulated by Cu status, and also in the pmCOPT and ABA mutants. Altered Cu uptake resulted in modified plant sensitivity to salt-mediated increases in endogenous ABA. The overall results provide evidence for reciprocal cross-talk between Cu status and ABA metabolism and signaling.

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Section: Discussionmentioning

confidence: 49%

“…1A, B). Since hy5 mutants are less sensitive to ABA (Chen et al 2014), the copt2 mutant, which expressed higher HY5 levels, consequently gave an enhanced response to ABA under Cu sufficiency (Fig. 1A, B).…”

Section: Discussionmentioning

confidence: 99%

Interaction Between ABA Signaling and Copper Homeostasis inArabidopsis thaliana

et al. 2016

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“…ROS signaling is widespread in plants [85]. As an early chemical result of stress, ROS accumulation is well placed to be a first or early signalling-trigger for adaptive responses to the stress [86], involving both systems against injury by ROS (catalase, peroxidase, dismutase, glutathione, ascorbate, isoprenoids) and also ROS-signalling toward induction of stress tolerance. Early ROS accumulation in resurrection plants would need to be high enough to trigger tolerance-induction but not so high as to produce cell injury.…”

Section: Reactive Oxygen Species (Ros)mentioning

confidence: 99%

“…Increasing ROS stimulates synthesis of auxin and of ABA, which inhibit germination [86]. ROS can accumulate, under temperature and salt stress, in the phloem apoplast where it mediates a rapid signalling pathway that is independent of other signalling pathways [39].…”

Section: Reactive Oxygen Species (Ros)mentioning

confidence: 99%

Plant Desiccation Tolerance and its Regulation in the Foliage of Resurrection “Flowering-Plant” Species

et al. 2018

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Abstract:The majority of flowering-plant species can survive complete air-dryness in their seed and/or pollen. Relatively few species ('resurrection plants') express this desiccation tolerance in their foliage. Knowledge of the regulation of desiccation tolerance in resurrection plant foliage is reviewed. Elucidation of the regulatory mechanism in resurrection grasses may lead to identification of genes that can improve stress tolerance and yield of major crop species. Well-hydrated leaves of resurrection plants are desiccation-sensitive and the leaves become desiccation tolerant as they are drying. Such drought-induction of desiccation tolerance involves changes in gene-expression causing extensive changes in the complement of proteins and the transition to a highly-stable quiescent state lasting months to years. These changes in gene-expression are regulated by several interacting phytohormones, of which drought-induced abscisic acid (ABA) is particularly important in some species. Treatment with only ABA induces desiccation tolerance in vegetative tissue of Borya constricta Churchill. and Craterostigma plantagineum Hochstetter. but not in the resurrection grass Sporobolus stapfianus Gandoger. Suppression of drought-induced senescence is also important for survival of drying. Further research is needed on the triggering of the induction of desiccation tolerance, on the transition between phases of protein synthesis and on the role of the phytohormone, strigolactone and other potential xylem-messengers during drying and rehydration.

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“…YUCCA3 over‐expressing plants containing elevated levels of active auxin have a more severe germination defect under salt stress (Park et al ., ). Other studies show that a H 2 O 2 ‐scavenging gene knockout mutant, apx6 , displays a reduced germination rate, possibly caused by an elevated level of IAA; therefore, adding 100 μ m IAA could completely suppress germination of apx6 in Arabidopsis (Chen et al ., ,b).…”

Section: Introductionmentioning

confidence: 99%

Germostatin resistance locus 1 encodes a PHD finger protein involved in auxin‐mediated seed dormancy and germination

Gong

Xiao

et al. 2015

The Plant Journal

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SUMMARYSeed dormancy and germination are important physiological processes during the life cycle of a seed plant. Recently, auxin has been characterized as a positive regulator that functions during seed dormancy and as a negative regulator during germination. Through chemical genetic screenings, we have identified a small molecule, germostatin (GS), which effectively inhibits seed germination in Arabidopsis. GSR1 (germostatin resistance locus 1) encodes a tandem plant homeodomain (PHD) finger protein, identified by screening GSresistant mutants. Certain PHD fingers of GSR1 are capable of binding unmethylated H3K4, which has been reported as an epigenetic mark of gene transcriptional repression. Biochemical studies show that GSR1 physically interacts with the transcriptional repressor ARF16 and attenuates the intensity of interaction of IAA17/ARF16 by directly interacting with IAA17 to release ARF16. Further results show that axr3-1, arf10 arf16 are hyposensitive to GS, and gsr1 not only resists auxin-mediated inhibition of seed germination but also displays decreased dormancy. We therefore propose that GSR1 may form a co-repressor with ARF16 to regulate seed germination. Besides promoting auxin biosynthesis via upregulating expression of YUCCA1, GS also enhances auxin responses by inducing degradation of DΙΙ-VENUS and upregulating expression of DR5-GFP. In summary, we identified GSR1 as a member of the auxin-mediated seed germination genetic network, and GS, a small non-auxin molecule that specifically acts on auxin-mediated seed germination.

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New cross talk between ROS, ABA and auxin controlling seed maturation and germination unraveled in APX6 deficient Arabidopsis seeds

Cited by 32 publications

References 25 publications

Interaction Between ABA Signaling and Copper Homeostasis inArabidopsis thaliana

Interaction Between ABA Signaling and Copper Homeostasis inArabidopsis thaliana

Plant Desiccation Tolerance and its Regulation in the Foliage of Resurrection “Flowering-Plant” Species

Germostatin resistance locus 1 encodes a PHD finger protein involved in auxin‐mediated seed dormancy and germination

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