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Plant growth regulators interact with elevated temperature to alter heat stress signaling via the Unfolded Protein Response in maize

机译:植物生长调节剂与高温相互作用通过玉米中未折叠的蛋白质反应改变热应激信号传递

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摘要

Plants are increasingly exposed to high temperatures, which can cause accumulation of unfolded protein in the endoplasmic reticulum (ER). This condition, known as ER stress, evokes the unfolded protein response (UPR), a cytoprotective signaling pathway. One important branch of the UPR is regulated by splicing of bZIP60 mRNA by the IRE1 stress sensor. There is increasing evidence that commercial plant growth regulators may protect against abiotic stressors including heat stress and drought, but there is very little mechanistic information about these effects or about the regulatory pathways involved. We evaluated evidence in the B73 Zea mays inbred for differences in the activity of the UPR between permissive and elevated temperature in conjunction with plant growth regulator application. Treatment with elevated temperature and plant growth regulators increased UPR activation, as assessed by an increase in splicing of the mRNA of the IRE1 target bZIP60 following paclobutrazol treatment. We propose that plant growth regulator treatment induces bZIP60 mRNA splicing which ‘primes’ plants for rapid adaptive response to subsequent endoplasmic reticulum-stress inducing conditions.
机译:植物越来越多地暴露于高温下,这可能导致未折叠的蛋白质在内质网(ER)中积累。这种情况称为ER应激,会引起未折叠的蛋白质反应(UPR),一种细胞保护性信号通路。 UPR的一个重要分支是由IRE1压力传感器通过剪接bZIP60 mRNA来调节的。越来越多的证据表明,商用植物生长调节剂可以防止非生物胁迫,包括热胁迫和干旱,但是关于这些效应或涉及的调控途径的机制信息很少。我们评估了B73玉米自交系中允许和升高的温度下以及植物生长调节剂的应用下UPR活性差异的证据。用高温和植物生长调节剂处理可增加UPR活化,如通过多效唑处理后IRE1目标bZIP60 mRNA的剪接增加所评估。我们建议,植物生长调节剂处理可诱导bZIP60 mRNA剪接,从而“引发”植物对随后的内质网胁迫诱导条件做出快速适应性反应。

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