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Local auxin biosynthesis promotes shoot patterning and stem cell differentiation in Arabidopsis shoot apex.

Authors :
Yadav S
Kumar H
Mahajan M
Sahu SK
Singh SK
Yadav RK
Source :
Development (Cambridge, England) [Development] 2023 Dec 01; Vol. 150 (23). Date of Electronic Publication: 2023 Dec 06.
Publication Year :
2023

Abstract

The shoot apical meristem (SAM) of higher plants comprises distinct functional zones. The central zone (CZ) is located at the meristem summit and harbors pluripotent stem cells. Stem cells undergo cell division within the CZ and give rise to descendants, which enter the peripheral zone (PZ) and become recruited into lateral organs. Stem cell daughters that are pushed underneath the CZ form rib meristem (RM). To unravel the mechanism of meristem development, it is essential to know how stem cells adopt distinct cell fates in the SAM. Here, we show that meristem patterning and floral organ primordia formation, besides auxin transport, are regulated by auxin biosynthesis mediated by two closely related genes of the TRYPTOPHAN AMINOTRANSFERASE family. In Arabidopsis SAM, TAA1 and TAR2 played a role in maintaining auxin responses and the identity of PZ cell types. In the absence of auxin biosynthesis and transport, the expression pattern of the marker genes linked to the patterning of the SAM is perturbed. Our results prove that local auxin biosynthesis, in concert with transport, controls the patterning of the SAM into the CZ, PZ and RM.<br />Competing Interests: Competing interests The authors declare no competing or financial interests.<br /> (© 2023. Published by The Company of Biologists Ltd.)

Details

Language :
English
ISSN :
1477-9129
Volume :
150
Issue :
23
Database :
MEDLINE
Journal :
Development (Cambridge, England)
Publication Type :
Academic Journal
Accession number :
38054970
Full Text :
https://doi.org/10.1242/dev.202014