Extracellular ATP, a danger signal, is recognized by DORN1 in Arabidopsis

2014 ◽  
Vol 463 (3) ◽  
pp. 429-437 ◽  
Author(s):  
Jeongmin Choi ◽  
Kiwamu Tanaka ◽  
Yan Liang ◽  
Yangrong Cao ◽  
Sang Yeol Lee ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Stress Responses ◽  
Early Stage ◽  
Plant Stress ◽  
Extracellular Atp ◽  
Receptor Kinase ◽  
Danger Signal ◽  
Lectin Receptor ◽  
Plant Stress Responses

ATP, the universal energy currency of all organisms, is released into the extracellular matrix and serves as a signal among cells, where it is referred to as an extracellular ATP. Although a signalling role for extracellular ATP has been well studied in mammals over the last 40 years, investigations of such a role in plants are at an early stage. Recently, the first plant receptor for extracellular ATP, DOes not Respond to Nucleotides (DORN1), was identified in Arabidopsis thaliana by mutant screening. DORN1 encodes a legume-type lectin receptor kinase that is structurally distinct from the mammalian extracellular ATP receptors. In the present review, we highlight the genetic and biochemical evidence for the role of DORN1 in extracellular ATP signalling, placing this within the wider context of extracellular ATP signalling during plant stress responses.

scholarly journals Involvement of Arginase in Methyl Jasmonate–induced Tomato Fruit Chilling Tolerance

2016 ◽  
Vol 141 (2) ◽  
pp. 139-145 ◽  
Author(s):  
Xinhua Zhang ◽  
Fujun Li ◽  
Nana Ji ◽  
Shujun Shao ◽  
Dongyang Wang ◽  
...  
Keyword(s):  
Methyl Jasmonate ◽  
Stress Responses ◽  
Tomato Fruit ◽  
Chilling Injury ◽  
Plant Stress ◽  
Physiological Role ◽  
Chilling Tolerance ◽  
Antioxidant Enzyme System ◽  
Plant Stress Responses

The physiological role of arginase in nitrogen remobilization processes from protein degradation during seed germination has well been described in several species. However, very little is known about its possible roles in plant stress responses. Treatment of tomato fruit (Solanum lycopersicum L.) with 0.05 mm methyl jasmonate (MeJA) enhanced transcription levels of arginase genes, especially LeARG2. Chilling injury (CI) of fruit treated with 0.05 mm MeJA for 12 hours was also effectively alleviated, as manifested by decreases in CI index, electrolyte leakage, and malondialdehyde (MDA) content. To investigate the potential role of arginase in MeJA-induced chilling tolerance, fruit were treated with MeJA or the arginase inhibitor Nω-hydroxy-nor-l-arginine (nor-NOHA) combined with MeJA and then stored at 2 °C for 28 days. MeJA-induced arginase activity was strongly inhibited and the reduction of CI by MeJA was nearly abolished by the inhibitor. In addition, MeJA treatment increased the activities of superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX); inhibited peroxidase (POD) activities; and promoted proline and polyamines accumulation. These effects were partially counteracted by nor-NOHA; putrescine accumulation, however, was unaffected by the inhibitor. Our results indicate that arginase may be involved in MeJA-induced chilling tolerance, possibly by ameliorating the antioxidant enzyme system of fruit and increasing proline levels.

The role of miR398 in plant stress responses

2010 ◽  
Vol 32 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Yan-Fei DING ◽  
Guang-Yue WANG ◽  
Ya-Ping FU ◽  
Cheng ZHU
Keyword(s):  
Stress Responses ◽  
Plant Stress ◽  
Plant Stress Responses

scholarly journals The role of retrograde signals during plant stress responses

2017 ◽  
Vol 69 (11) ◽  
pp. 2783-2795 ◽  
Author(s):  
Tim Crawford ◽  
Nóra Lehotai ◽  
Åsa Strand
Keyword(s):  
Stress Responses ◽  
Plant Stress ◽  
Plant Stress Responses

scholarly journals Characterization of BRS1 Functions in Plant Stress Responses

2020 ◽  
Author(s):  
Dongzhi Zhang ◽  
Peng Zhao ◽  
Shengbao Xu
Keyword(s):  
Stress Responses ◽  
Redox Regulation ◽  
Plant Stress ◽  
Serine Carboxypeptidase ◽  
Biotic And Abiotic Stress ◽  
Brassinosteroid Signaling ◽  
Plant Stress Responses ◽  
Precise Role

Abstract Background: Brassinosteroid-insensitive 1 suppressor 1 (BRS1), is a serine carboxypeptidase that mediates brassinosteroid signaling and participates in multiple developmental processes in Arabidopsis. However, little is known about the precise role of BRS1 in this context. Results: In this study, we analyzed transcriptional and proteomic profiles of Arabidopsis seedlings overexpressing BRS1 and found that this gene is involved in both biotic and abiotic stress responses and redox regulation. Further proteomic evidence shows that BRS1 regulates cell redox by indirectly interacting with cytosolic NADP+-dependent isocitrate dehydrogenase (cICDH). We identified two novel splice products of BRS1, which might play important roles in development and stress responses in plants. Conclusions: This study highlights the role of BRS1 in plant redox regulation and stress responses, which extends our understanding of extracellular serine carboxypeptidases.

scholarly journals Identification of Drought-Responsive microRNAs from Roots and Leaves of Alfalfa by High-Throughput Sequencing

2017 ◽  
Author(s):  
Yue Li ◽  
Liqiang Wan ◽  
Shuyi Bi ◽  
Xiufu Wan ◽  
Zhenyi Li ◽  
...  
Keyword(s):  
Drought Stress ◽  
High Throughput ◽  
Stress Responses ◽  
High Throughput Sequencing ◽  
Target Genes ◽  
Plant Stress ◽  
Online Tool ◽  
Bioenergy Plant ◽  
Plant Stress Responses

Alfalfa, an important legume forage, is an ideal crop for sustainable agriculture and a potential bioenergy plant. Drought, one of the most common environmental stresses, substantially affects plants’ growth, development and productivity. MicroRNAs (miRNAs) are newly discovered gene expression regulators that have been linked to several plant stress responses. To elucidate the role of miRNAs in drought stress regulation of alfalfa, a high-throughput sequencing approach was used to analyze 12 small RNA libraries comprising of 4 samples, each with 3 biological replicates. We identified 348 known miRNAs, belonging to 80 miRNA families, from the 12 libraries and 281 novel miRNAs using Mireap software. 18 known miRNAs in roots and 12 known miRNAs in leaves were screened out as drought-responsive miRNAs. Except for miR319d and miR157a which were upregulated under drought stress, the expression pattern of drought-responsive miRNAs were different between roots and leaves in alfalfa. This is the first study discovering miR157a, miR1507, miR3512, miR3630, miR5213, miR5294, miR5368 and miR6173 are drought-responsive miRNAs. Target transcripts of drought-responsive miRNAs were computationally predicted. All 447 target genes for the known miRNAs were predicted using an online tool. This study provides a significant insight on understanding drought-responsive mechanisms of alfalfa.

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