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Article Abstract
Drought causes the abscission of flowers and fruits, thereby reducing yields. Although trimethylation of histone H3 in the lysine 27 (H3K27me3)-dependent pathway has been shown to control drought responses, the mechanisms underlying drought-induced abscission remain unknown. In this study, we showed that drought-induced calcineurin B-like11 (SlCBL11) upregulation activated the CBL-interacting protein kinase10 (SlCIPK10) to phosphorylate like heterochromatin protein 1b (SlLHP1b) at Thr387 and Thr389, respectively, in stamens of tomato (Solanum lycopersicum). Phosphorylation at Thr389 improved SlLHP1b stability, and phosphorylation at Thr387/Thr389 enhanced SlLHP1b binding ability to H3K27me3. Hence, SlLHP1b-dependent epigenetic silencing of the expression of SlYUC in stamens was promoted, which decreased the auxin content in stamens, causing the disruption of the auxin gradient in the abscission zone, and eventually flower drop in tomatoes. Overall, we showed a mechanism by which Ca signaling controls H3K27me3 through the SlCBL11-SlCIPK10-SlLHP1b module to inhibit auxin synthesis during drought-induced flower drop.
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| http://dx.doi.org/10.1016/j.devcel.2025.05.006 | DOI Listing |
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