ORCID Profile
0000-0002-6772-6506
Current Organisations
Nagoya University
,
Japan Science and Technology Agency
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Publisher: Oxford University Press (OUP)
Date: 09-06-2014
DOI: 10.1093/JXB/ERU235
Abstract: Internal aeration is crucial for root growth in waterlogged soil. A barrier to radial oxygen loss (ROL) can enhance long-distance oxygen transport via the aerenchyma to the root tip a higher oxygen concentration at the apex enables root growth into anoxic soil. The ROL barrier is formed within the outer part of roots (OPR). Suberin and/or lignin deposited in cell walls are thought to contribute to the barrier, but it is unclear which compound is the main constituent. This study describes gene expression profiles during ROL barrier formation in rice roots to determine the relative responses of suberin and/or lignin biosyntheses for the barrier. OPR tissues were isolated by laser microdissection and their transcripts were analysed by microarray. A total of 128 genes were significantly up- or downregulated in the OPR during the barrier formation. Genes associated with suberin biosynthesis were strongly upregulated, whereas genes associated with lignin biosynthesis were not. By an ab initio analysis of the promoters of the upregulated genes, the putative cis-elements that could be associated with transcription factors, WRKY, AP2/ERF, NAC, bZIP, MYB, CBT/DREB, and MADS, were elucidated. They were particularly associated with the expression of transcription factor genes containing WRKY, AP2, and MYB domains. A semiquantitative reverse-transcription PCR analysis of genes associated with suberin biosynthesis (WRKY, CYP, and GPAT) confirmed that they were highly expressed during ROL barrier formation. Overall, these results suggest that suberin is a major constituent of the ROL barrier in roots of rice.
Publisher: Wiley
Date: 20-12-2020
DOI: 10.1111/NPH.17093
Publisher: Oxford University Press (OUP)
Date: 08-11-2017
DOI: 10.1104/PP.17.01157
Publisher: FapUNIFESP (SciELO)
Date: 2022
Publisher: Springer Vienna
Date: 06-12-2013
Publisher: Springer Science and Business Media LLC
Date: 27-02-2012
Abstract: Rice ( Oryza sativa L.), unlike other cereals, can grow well in paddy fields and is highly tolerant of excess water stress, from either submergence (in which part or all of the plant is under water) or waterlogging (in which excess water in soil limits gas diffusion). Rice handles submergence stress by internal aeration and growth controls. A quiescence strategy based on Submergence-1A ( SUB1A ) or an escape strategy based on SNORKEL1 ( SK1 ) and SNORKEL2 ( SK2 ) is used for the growth controls. On the other hand, rice handles waterlogging stress by forming lysigenous aerenchyma and a barrier to radial O 2 loss (ROL) in roots in order to supply O 2 to the root tip. In this article, we summarize recent advances in understanding the mechanisms of responding to excess water stresses ( i.e ., submergence and waterlogging) in rice and other gramineous plants.
Location: No location found
No related grants have been discovered for Takaki Yamauchi.