Arabidopsis Chromatin Remodeler SPLAYED Is Required for Abscisic Acid-Mediated Post-Germination Growth Arrest
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ID: 320764
2026
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Abstract
The phytohormone abscisic acid (ABA) promotes seed dormancy, inhibits seed germination, and induces post-germination growth arrest. It remains unclear how chromatin remodeling influences ABA responses during early seedling establishment. In this study, an artificial microRNA targeting two Sucrose Non-Fermenting 2 (SNF2)-family chromatin remodeling ATPases, SPLAYED (SYD) and PHOTOPERIOD-INDEPENDENT EARLY FLOWERING1 (PIE1), was identified through unbiased forward genetic screening of artificial microRNA (amiRNA)-expressing pooled seed libraries exhibiting ABA insensitivity during the seed-to-seedling transition. T-DNA insertional mutants of syd and pie1, along with amiRNA-expressing knockdown lines amiR-SYD and amiR-PIE1, confirmed that SYD is required for ABA inhibition of post-germination growth. Transcriptomic analyses revealed that, under ABA treatment, amiR-SYD mutant seeds exhibited increased expression of the ABA catabolism gene CYP707A3 and the gibberellin (GA) biosynthesis genes GA20OX2, GA20OX3, GA3OX1, GA3OX2, and GA3OX4. Concurrently, the ABA-responsive genes KIN1 and EM6 were less strongly induced, whereas the GA-responsive genes GASA4 and GASA6 were more strongly induced. The ABA hyposensitivity observed in amiR-SYD mutants was reversed by treatment with uniconazole, an inhibitor of ABA catabolism and GA biosynthesis. These findings suggest that the SYD-associated chromatin remodeling complex positively regulates ABA-mediated post-germination growth arrest by modulating the balance between ABA and GA responses, in contrast to its close homolog BRAHMA (BRM), which negatively regulates ABA responses through an ABI5-mediated checkpoint.
| Reference Key |
openalex_W7168091878
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| Authors | Po‐Kai Hsu, Felix Hauser, Charles A. Seller, Alexandria Tran, K S Lee, JP Schroeder |
| Journal | Plant physiology and biochemistry : PPB |
| Year | 2026 |
| DOI |
10.1093/plphys/kiag478
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| URL | |
| Keywords | Keywords not found |
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