التفاصيل البيبلوغرافية
| العنوان: |
A ligand-independent origin of abscisic acid perception. |
| المؤلفون: |
Yufei Sun, Harpazi, Ben, Wijerathna-Yapa, Akila, Merilo, Ebe, de Vries, Jan, Michaeli, Daphna, Gal, Maayan, Cuming, Andrew C., Kollist, Hannes, Mosquna, Assaf |
| المصدر: |
Proceedings of the National Academy of Sciences of the United States of America; 12/3/2019, Vol. 116 Issue 49, p24892-24899, 8p |
| مصطلحات موضوعية: |
ABSCISIC acid, VASCULAR plants, PROTEIN kinases, SENSORY perception, LIVERWORTS |
| مستخلص: |
Land plants are considered monophyletic, descending from a single successful colonization of land by an aquatic algal ancestor. The ability to survive dehydration to the point of desiccation is a key adaptive trait enabling terrestrialization. In extant land plants, desiccation tolerance depends on the action of the hormone abscisic acid (ABA) that acts through a receptor-signal transduction pathway comprising a PYRABACTIN RESISTANCE 1-like (PYL)–PROTEIN PHOSPHATASE 2C (PP2C)–SNF1-RELATED PROTEIN KINASE 2 (SnRK2) module. Early-diverging aeroterrestrial algae mount a dehydration response that is similar to that of land plants, but that does not depend on ABA: Although ABA synthesis is widespread among algal species, ABA-dependent responses are not detected, and algae lack an ABA-binding PYL homolog. This raises the key question of how ABA signaling arose in the earliest land plants. Here, we systematically characterized ABA receptor-like proteins frommajor land plant lineages, including a protein found in the algal sister lineage of land plants. We found that the algal PYL-homolog encoded by Zygnema circumcarinatum has basal, ligand-independent activity of PP2C repression, suggesting this to be an ancestral function. Similarly, a liverwort receptor possesses basal activity, but it is further activated by ABA. We propose that co-option of ABA to control a preexisting PP2C-SnRK2-dependent desiccation-tolerance pathway enabled transition from an all-or-nothing survival strategy to a hormone-modulated, competitive strategy by enabling continued growth of anatomically diversifying vascular plants in dehydrative conditions, enabling them to exploit their new environment more efficiently. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
