Abstract
Main conclusions
Over-expression of Phytoglobin1 increases the viability of maize root stem cells to low oxygen stress through changes in auxin and jasmonic acid responses.
Abstract
Hypoxia inhibits maize (Zea mays L.) root growth by deteriorating the quiescent center (QC) stem cells of the root apical meristem. Over-expression of the Phytoglobin1 ZmPgb1.1 alleviates these effects through the retention of the auxin flow along the root profile required for the specification of the QC stem cells. To identify QC-specific hypoxia responses and determine whether ZmPgb1.1 exercises a direct role on QC stem cells, we performed a QC functionality test. This was done by estimating the ability of QCs to regenerate a root in vitro in a hypoxic environment. Hypoxia decreased the functionality of the QCs by depressing the expression of several genes participating in the synthesis and response of auxin. This was accompanied by a decrease in DR5 signal, a suppression of PLETHORA and WOX5, two markers of QC cell identity, and a reduction in expression of genes participating in JA synthesis and signaling. Over-expression of ZmPgb1.1 was sufficient to mitigate all these responses. Through pharmacological alterations of auxin and JA, it is demonstrated that both hormones are required for QC functionality under hypoxia, and that JA acts downstream of auxin during QC regeneration. A model is proposed whereby the ZmPgb1.1 maintenance of auxin synthesis in hypoxic QCs is determinant for the retention of their functionality, with JA supporting the regeneration of roots from the QCs.
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Abbreviations
- JA:
-
Jasmonic acid
- LK:
-
L-kynurenine
- NO:
-
Nitric oxide
- Pgb:
-
Phytoglobin
- QC:
-
Quiescent center
- RAM:
-
Root apical meristem
- WOX5:
-
WUSCHEL-RELATED HOMEOBOX5
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Acknowledgements
This work was supported by a NSERC Discovery Grant (126542) to CS.
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Funding was provided by NSERC, 2465, Claudio Stasolla.
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Rathnayaka Pathiranage, R.G.L., Mira, M.M., Hill, R.D. et al. The inhibition of maize (Zea mays L.) root stem cell regeneration by low oxygen is attenuated by Phytoglobin 1 (Pgb1) through changes in auxin and jasmonic acid. Planta 257, 120 (2023). https://doi.org/10.1007/s00425-023-04144-w
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DOI: https://doi.org/10.1007/s00425-023-04144-w