Liu, Pu and Quan, Xin and Song, Zihan and Li, Wenhao and Wang, Yuan and Gu, Hongya and Xie, Daoxin and Yang, Weicai and Dresselhaus, Thomas and Zhong, Sheng and Qu, Li-Jia (2025) A two-step self-pollination mechanism maximizes fertility in Brassicaceae. CELL, 188 (11). pp. 2845-2855. ISSN 0092-8674, 1097-4172
Full text not available from this repository. (Request a copy)Abstract
Self-pollination in self-compatible plant species often occurs prior to flower opening. By tracking the temporal progress of pollination in Arabidopsis, we observed that pollen predominantly targets the lateral region of the stigma in unopened flowers. Notably, approximately 7 h after flower opening, flowers close, thereby pressing anthers toward the central region of the stigma for a second self-pollination. This two-step self-pollination results in a doubling of pollen deposition, which significantly increases the ovule-targeting ratio and improves fertility under pollen-limiting conditions, as evident in the anther-dehiscence-defective mutant myb108 and under environmental stress conditions. Analysis using gamete-interaction-defective mutants hap2/gcs1 and dmp8 dmp9 revealed that the timely separation of both pollination events promotes fertilization recovery efficiency. A similar two-step pollination was observed in two other self-pollinating but not in outcrossing Brassicaceae species. This mechanism represents a reproductive assurance strategy in predominantly self-pollinating annuals to maximize fertility under unfavorable conditions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | POLLEN-LIMITATION; FERTILIZATION; EVOLUTION; REPRODUCTION; SELECTION; SYSTEMS; MYB108; PLANTS; GENES; SIZE; |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 18 May 2026 09:21 |
| Last Modified: | 18 May 2026 09:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67503 |
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