globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2012892118
论文题名:
Evidence for root adaptation to a spatially discontinuous water availability in the absence of external water potential gradients
作者: Lind K.R.; Siemianowski O.; Yuan B.; Sizmur T.; Van Every H.; Banerjee S.; Cademartiri L.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2021
卷: 118, 期:1
语种: 英语
英文关键词: Hydrotropism ; Paper microfluidics ; Root phenotyping ; Water stress
英文摘要: We hereby show that root systems adapt to a spatially discontinuous pattern of water availability even when the gradients of water potential across them are vanishingly small. A paper microfluidic approach allowed us to expose the entire root system of Brassica rapa plants to a square array of water sources, separated by dry areas. Gradients in the concentration of water vapor across the root system were as small as 10-4·mM·m-1(∼4 orders of magnitude smaller than in conventional hydrotropism assays). Despite such minuscule gradients (which greatly limit the possible influence of the well-understood gradient-driven hydrotropic response), our results show that 1) individual roots as well as the root system as a whole adapt to the pattern of water availability to maximize access to water, and that 2) this adaptation increases as water sources become more rare. These results suggest that either plant roots are more sensitive to water gradients than humanmade water sensors by 3-5 orders of magnitude, or they might have developed, like other organisms, mechanisms forwater foraging that allow them to findwater in the absence of an external gradient in water potential. © 2021 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163887
Appears in Collections:气候变化与战略

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作者单位: Lind, K.R., Department of Materials Science & Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States; Siemianowski, O., Department of Materials Science & Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States; Yuan, B., Department of Chemical & Biological Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States; Sizmur, T., Department of Materials Science & Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States; Van Every, H., Department of Materials Science & Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States; Banerjee, S., Department of Materials Science & Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States; Cademartiri, L., Department of Materials Science & Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States, Department of Chemical & Biological Engineering, Iowa State University of Science and Technology, Ames, IA 50011, United States, Ames Laboratory, US Department of Energy, Ames, IA 50011, United States, Department of Chemistry, Life Sciences and Sustainability, University of Parma, Parma, 43124, Italy

Recommended Citation:
Lind K.R.,Siemianowski O.,Yuan B.,et al. Evidence for root adaptation to a spatially discontinuous water availability in the absence of external water potential gradients[J]. Proceedings of the National Academy of Sciences of the United States of America,2021-01-01,118(1)
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