NAC transcription factor ONAC066 positively regulates disease resistance by suppressing the ABA signaling pathway in rice
Qing LiuShijuan YanWenjie HuangJianyuan YangJingfang DongShaohong ZhangJunliang ZhaoTifeng YangXingxue MaoXiaoyuan ZhuBin Liu
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Keywords:
Jasmonic acid
Systemic Acquired Resistance
Wild type
WRKY protein domain
Transcription
As important transcription factors, WRKYs play a vital role in the defense response of plants against the invasion of multiple pathogens. Though some WRKY members have been reported to participate in pepper immunity in response to
Ralstonia solanacearum
WRKY protein domain
Jasmonic acid
Bacterial wilt
NPR1
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Phytohormone abscisic acid (ABA) and plant-specific WRKY transcription factors (TFs) have been implicated to play important roles in various stress responses. The involvement of WRKY TFs in ABA-mediated cold tolerance of economical fruits, such as banana fruit, however remains largely unknown. Here, we reported that ABA application could induce expressions of ABA biosynthesis-related genes MaNCED1 and MaNCED2, increase endogenous ABA contents, and thereby enhance cold tolerance in banana fruit. Four banana fruit WRKY TFs, designated as MaWRKY31, MaWRKY33, MaWRKY60, and MaWRKY71, were identified and characterized. All four of these MaWRKYs were nuclear-localized and displayed transactivation activities. Their expressions were induced by ABA treatment during cold storage. More importantly, the gel mobility shift assay and transient expression analysis revealed that MaWRKY31, MaWRKY33, MaWRKY60, and MaWRKY71 directly bound to the W-box elements in MaNCED1 and MaNCED2 promoters and activated their expressions. Taken together, our findings demonstrate that banana fruit WRKY TFs are involved in ABA-induced cold tolerance by, at least in part, increasing ABA levels via directly activating NECD expressions.
WRKY protein domain
Cold tolerance
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WRKY protein domain
Jasmonic acid
Magnaporthe
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Abstract Abscisic acid (ABA) plays a fundamental role in plant response and adaptation to abiotic stresses, such as drought, high salinity and low temperature. Populus hopeiensis exhibits exceptional tolerance to water-deficit environments and is therefore an excellent choice for studying drought tolerance in trees. This study provides a global view of transcriptome dynamics in P. hopeiensis in response to exogenous ABA using Illumina RNA-sequencing. Endogenous ABA content increased and reached a peak at 8 h after ABA treatment and then significantly decreased at latter time points. Differential expression analysis and Gene ontology enrichment revealed that the number of transcripts exhibited significant increase during the first 8 hours after ABA treatment, which then significantly decreased at 12 and 24 h. Transcription factors (TFs) analysis showed that six different patterns were observed based on the expression of the six TFs families (AP2/ERF, NAC, MYB, MYB-related, bZIP and WRKY) and the majority of differentially expressed TFs increased rapidly after ABA treatment. This study provides a robust resource for investigating the functions of genes induced by ABA and will help to develop a better understanding of the molecular regulatory mechanism in response to drought in poplar.
WRKY protein domain
MYB
Drought Tolerance
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Jasmonic acid and abscisic acid are important intracellular regulators mediating diverse developmental processes, such as seed germination, leaf abscission and senescence. In addition, they are essential mediators in triggering some plant responses to abiotic stresses including drought, salinity and cold. How hormones interact to coordinate these responses which are referred to as signalling crosstalk is an area receives intense interest from plant physiologists. The aim of the present work is to study the possible roles of treatments with jasmonic acid (100μM), abscisic acid (100 μM) and their combination (100 μM JA + 100 μM ABA) on alleviating the harmful effects of drought stress on endogenous phytohormones, polyamines, total soluble protein and protein banding pattern of soybean plant (Glycine max L cv. Giza 22). An additional point of interest was to detect the change in trypsin protease inhibitor production in response to treatment with different concentrations of jasmonic acid and abscisic acid using ELISA technique. W e found that both jasmonic acid and abscisic acid ameliorate the adverse effects of drought stress on soybean plant, but treatment with jasmonic acid was more efficient. W e also revealed that production of trypsin inhibitor in soybean plant could take place via a JA- or ABA-depending signalling pathway.
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Content of endogenous abscisic acid (ABA) increased in rice plants under salt stress. Pre- or post-treatment by jasmonic acid (JA) mostly further increased ABA content. In the presence of salt stress also content of gibberellins (GAs) mostly increased more after treatment by JA. Endogenous content of bioactive GA1 was higher in post-treatment by JA than in pre-treatment by JA.
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Systemic Acquired Resistance
Jasmonic acid
Plant Immunity
Priming (agriculture)
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The possible interaction of the two growth regulators, abscisic acid and jasmonic acid, on the inhibition of seed germination and the induction of freezing tolerance in bromegrass (Bromus inermis Leyss) cell cultures was investigated. Both of these processes are known to be affected by exogenous abscisic acid. Alfalfa (Medicago sativa), cornflower (Centurae gynura), cress seed (Lepidium sativum), maize (Zea mays), and wheat (Triticum aestivum) seeds were treated with varying concentrations of abscisic acid and jasmonic acid, either alone or in combination. In all species, seed germination was inhibited by 10 μM abscisic acid at 23 °C. In contrast, at 23 °C, jasmonic acid was partially inhibitory only at 100 μM; however, 10 μM jasmonic acid inhibited germination in all species at 10 °C. Jasmonic acid in combination with abscisic acid resulted in a higher degree of germination inhibition at 23 °C in all species than either growth regulator applied separately. Treatment of a bromegrass suspension cell culture with 75 μM abscisic acid at 25 °C for 7 days increased the freezing tolerance from −10 °C to lower than −35 °C. In contrast, jasmonic acid (0.25–75 μM) had no detectable effect on freezing tolerance. Jasmonic acid in combination with suboptimal concentrations of abscisic acid, however, enhanced the abscisic acid-induced freezing tolerance in these cells. In contrast, a combination of 75 μM abscisic acid and 25 or 75 μM jasmonic acid reduced the freezing tolerance of these cells compared with treatment with abscisic acid alone. Key words: abscisic acid, freezing tolerance, germination, jasmonic acid.
Jasmonic acid
Bromus inermis
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Anthracnose, caused by Colletotrichum truncatum, leads to large-scale reduction in quality and yield in soybean production. Limited information is available regarding the molecular mechanisms of resistance to anthracnose in soybean. We conducted a transcriptomic and targeted metabolomic analysis of pods from two soybean lines, "Zhechun No. 3" (ZC3) and ZC-2, in response to C. truncatum infection. Factors contributing to the enhanced resistance of ZC-2 to anthracnose compared with that of ZC3, included signal transduction (jasmonic acid, auxin, mitogen-activated protein kinase, and Ca2+ signaling), transcription factors (WRKY and bHLH), resistance genes (PTI1, RPP13, RGA2, RPS6, and ULP2B), pathogenesis-related genes (chitinase and lipid transfer protein), and terpenoid metabolism. Targeted metabolomic analysis revealed that terpenoid metabolism responded more promptly and more intensely to C. truncatum infection in ZC-2 than in ZC3. In vitro antifungal activity and resistance induction test confirmed that jasmonic acid, auxin signaling and terpenoids played important roles in soybean resistance to anthracnose. This research is the first study to explore the molecular mechanisms of soybean resistance to anthracnose. The findings are important for in-depth analysis of molecular resistance mechanisms, discovery of resistance genes, and to expedite the breeding of anthracnose-resistant soybean cultivars.
WRKY protein domain
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Chitinase
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Additional file 8: Table S2. Number of reads in each library.
WRKY protein domain
Jasmonic acid
Senescence
Transcription
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