Abstract
Development of xylem cells is affected by environmental stresses such as drought and oxidative stress, and recent findings suggested that jasmonic acid (JA) mediates this process through interaction with other phytohormones such as cytokinin. In this study, we showed that polar auxin transport regulated by PIN3 and PIN7 is involved in the JA-mediated xylem development in vascular tissues. The mutant plants that lack the activity of PIN3 and PIN7 responsible for the auxin transport developed extra xylems in vascular tissues such as the JA-treated wild-type plants. Visualization of auxin response and xylem development in the roots treated with NPA, an inhibitor of polar auxin transport, suggested that disruption of polar auxin transport is involved in the xylem phenotype of pin3 pin7 double mutants. We also found that cytokinin increases expressions of PIN3 and PIN7 responsible for the auxin transport while JA decreases only PIN7. These suggested that PIN7-mediated polar auxin transport system modulates xylem development in response to JA. The finding that JA affects auxin distribution in root vascular tissues further supported this. Collectively, these suggest that JA promotes xylem development by disrupting auxin transport in vascular tissues, and the auxin efflux genes, more especially PIN7 whose expression is suppressed by JA mediates this process.
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Acknowledgements
This work was carried out with the support of “Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ01323901)” Rural Development Administration, Republic of Korea and the National Research Foundation of Korea grant funded by the Korean Government (MOE) [NRF-2014R1A1A2054261] and [NRF-2016R1D1A1B03931167]. A graduate research assistantship to S.L. from the Brain Korea 21 Plus project of the MOE is also acknowledged.
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Jang, G., Lee, S., Chang, S.H. et al. Jasmonic acid modulates xylem development by controlling polar auxin transport in vascular tissues. Plant Biotechnol Rep 12, 265–271 (2018). https://doi.org/10.1007/s11816-018-0491-x
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DOI: https://doi.org/10.1007/s11816-018-0491-x