Yonggui Liang , Ziyan Feng , Bingwei Yu , Simin Yang , Changwen Gao , Renjian Liu , Zhilei Xia , Yujia Lin , Liping Chen , Zhengkun Qiu , Bihao Cao , Shuangshuang Yan
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引用次数: 0
Abstract
High temperature trigger various thermomorphogenic adaptations in plants, such as hypocotyl elongation, which disrupts developmental homeostasis and threaten agricultural productivity. However, the molecular mechanism underlying hypocotyl elongation in cucumber under high-temperature conditions remain poorly characterized. Here, we revealed that the increased auxin biosynthesis is a pivotal driver of high-temperature-induced hypocotyl elongation in cucumber. Transcript profiling indicated that CsYUC8, a gene encoding a key auxin biosynthetic enzyme, was upregulated in cucumber hypocotyl elongation under high-temperature conditions. Functional analysis and NPA (auxin inhibitor) treatments demonstrated that CsYUC8-mediated auxin accumulation is essential for thermomorphogenic hypocotyl elongation. Furthermore, we identified a heat-responsive bHLH transcription factor, CsPIF1-like, which directly binds to the CsYUC8 promoter to activate its expression. Those results revealed a CsPIF1-like-CsYUC8 regulatory module that fine-tunes auxin-dependent hypocotyl elongation in cucumber, providing a mechanistic framework for improving heat resilience in cucurbit crops.
期刊介绍:
The journal Plant Stress deals with plant (or other photoautotrophs, such as algae, cyanobacteria and lichens) responses to abiotic and biotic stress factors that can result in limited growth and productivity. Such responses can be analyzed and described at a physiological, biochemical and molecular level. Experimental approaches/technologies aiming to improve growth and productivity with a potential for downstream validation under stress conditions will also be considered. Both fundamental and applied research manuscripts are welcome, provided that clear mechanistic hypotheses are made and descriptive approaches are avoided. In addition, high-quality review articles will also be considered, provided they follow a critical approach and stimulate thought for future research avenues.
Plant Stress welcomes high-quality manuscripts related (but not limited) to interactions between plants and:
Lack of water (drought) and excess (flooding),
Salinity stress,
Elevated temperature and/or low temperature (chilling and freezing),
Hypoxia and/or anoxia,
Mineral nutrient excess and/or deficiency,
Heavy metals and/or metalloids,
Plant priming (chemical, biological, physiological, nanomaterial, biostimulant) approaches for improved stress protection,
Viral, phytoplasma, bacterial and fungal plant-pathogen interactions.
The journal welcomes basic and applied research articles, as well as review articles and short communications. All submitted manuscripts will be subject to a thorough peer-reviewing process.