Roots of the resurrection plant Tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves
Being sessile, plants must regulate energy balance, potentially via source-sink relations, to compromise growth with survival in stressful conditions. Crops are sensitive, possibly because they allocate their energy resources toward growth and yield rather than stress tolerance. In contrast, resurre...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Frontiers Media
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/106433 |
| _version_ | 1855526665865658368 |
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| author | Asami, P. Rupasinghe, T. Moghaddam, L. Njaci, Isaac Roessner, U. Mundree, S. Williams, B. |
| author_browse | Asami, P. Moghaddam, L. Mundree, S. Njaci, Isaac Roessner, U. Rupasinghe, T. Williams, B. |
| author_facet | Asami, P. Rupasinghe, T. Moghaddam, L. Njaci, Isaac Roessner, U. Mundree, S. Williams, B. |
| author_sort | Asami, P. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Being sessile, plants must regulate energy balance, potentially via source-sink relations, to compromise growth with survival in stressful conditions. Crops are sensitive, possibly because they allocate their energy resources toward growth and yield rather than stress tolerance. In contrast, resurrection plants tightly regulate sugar metabolism and use a series of physiological adaptations to suppress cell death in their vegetative tissue to regain full metabolic capacity from a desiccated state within 72 h of watering. Previously, we showed that shoots of the resurrection plant Tripogon loliiformis, initiate autophagy upon dehydration as one strategy to reinstate homeostasis and suppress cell death. Here, we describe the relationship between energy status, sugar metabolism, trehalose-mediated activation of autophagy pathways and investigate whether shoots and roots utilize similar desiccation tolerance strategies. We show that despite containing high levels of trehalose, dehydrated Tripogon roots do not display elevated activation of autophagy pathways. Using targeted and non-targeted metabolomics, transmission electron microscopy (TEM) and transcriptomics we show that T. loliiformis engages a strategy similar to the long-term drought responses of sensitive plants and continues to use the roots as a sink even during sustained stress. Dehydrating T. loliiformis roots contained more sucrose and trehalose-6-phosphate compared to shoots at an equivalent water content. The increased resources in the roots provides sufficient energy to cope with stress and thus autophagy is not required. These results were confirmed by the absence of autophagosomes in roots by TEM. Upregulation of sweet genes in both shoots and roots show transcriptional regulation of sucrose translocation from leaves to roots and within roots during dehydration. Differences in the cell's metabolic status caused starkly different cell death responses between shoots and roots. These findings show how shoots and roots utilize different stress response strategies and may provide candidate targets that can be used as tools for the improvement of stress tolerance in crops. |
| format | Journal Article |
| id | CGSpace106433 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | Frontiers Media |
| publisherStr | Frontiers Media |
| record_format | dspace |
| spelling | CGSpace1064332024-10-03T07:40:54Z Roots of the resurrection plant Tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves Asami, P. Rupasinghe, T. Moghaddam, L. Njaci, Isaac Roessner, U. Mundree, S. Williams, B. energy metabolism sucrose tolerance plants Being sessile, plants must regulate energy balance, potentially via source-sink relations, to compromise growth with survival in stressful conditions. Crops are sensitive, possibly because they allocate their energy resources toward growth and yield rather than stress tolerance. In contrast, resurrection plants tightly regulate sugar metabolism and use a series of physiological adaptations to suppress cell death in their vegetative tissue to regain full metabolic capacity from a desiccated state within 72 h of watering. Previously, we showed that shoots of the resurrection plant Tripogon loliiformis, initiate autophagy upon dehydration as one strategy to reinstate homeostasis and suppress cell death. Here, we describe the relationship between energy status, sugar metabolism, trehalose-mediated activation of autophagy pathways and investigate whether shoots and roots utilize similar desiccation tolerance strategies. We show that despite containing high levels of trehalose, dehydrated Tripogon roots do not display elevated activation of autophagy pathways. Using targeted and non-targeted metabolomics, transmission electron microscopy (TEM) and transcriptomics we show that T. loliiformis engages a strategy similar to the long-term drought responses of sensitive plants and continues to use the roots as a sink even during sustained stress. Dehydrating T. loliiformis roots contained more sucrose and trehalose-6-phosphate compared to shoots at an equivalent water content. The increased resources in the roots provides sufficient energy to cope with stress and thus autophagy is not required. These results were confirmed by the absence of autophagosomes in roots by TEM. Upregulation of sweet genes in both shoots and roots show transcriptional regulation of sucrose translocation from leaves to roots and within roots during dehydration. Differences in the cell's metabolic status caused starkly different cell death responses between shoots and roots. These findings show how shoots and roots utilize different stress response strategies and may provide candidate targets that can be used as tools for the improvement of stress tolerance in crops. 2019-04-25 2020-01-03T13:08:11Z 2020-01-03T13:08:11Z Journal Article https://hdl.handle.net/10568/106433 en Open Access Frontiers Media Asami, P., Rupasinghe, T., Moghaddam, L., Njaci, I, Roessner, U., Mundree, S. and Williams, B. 2019. Roots of the resurrection plant Tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves. Frontiers in Plant Science 10:459. |
| spellingShingle | energy metabolism sucrose tolerance plants Asami, P. Rupasinghe, T. Moghaddam, L. Njaci, Isaac Roessner, U. Mundree, S. Williams, B. Roots of the resurrection plant Tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves |
| title | Roots of the resurrection plant Tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves |
| title_full | Roots of the resurrection plant Tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves |
| title_fullStr | Roots of the resurrection plant Tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves |
| title_full_unstemmed | Roots of the resurrection plant Tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves |
| title_short | Roots of the resurrection plant Tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves |
| title_sort | roots of the resurrection plant tripogon loliiformis survive desiccation without the activation of autophagy pathways by maintaining energy reserves |
| topic | energy metabolism sucrose tolerance plants |
| url | https://hdl.handle.net/10568/106433 |
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