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- Title
Comparative Transcriptome Analysis of Hypocotyls During the Developmental Transition of C<sub>3</sub> Cotyledons to C<sub>4</sub> Leaves in Halimocnemis mollissima Bunge.
- Authors
Zolfaghar, Mahdis; Rutten, Twan; Ghaffari, Mohammad Reza; Banaei-Moghaddam, Ali Mohammad
- Abstract
Identification of signaling pathways that control C4 photosynthesis development is essential for introducing the C4 pathway into C3 crops. Species with dual photosynthesis in their life cycle are interesting models to study such regulatory mechanisms. The species used here Halimocnemis mollissima Bunge, belonging to the Caroxyleae tribe, displays C3 photosynthesis in its cotyledons and a NAD-ME subtype of C4 photosynthesis in the First leaves (FLs) onwards. We explored the long-distance signaling pathways that are probably implicated in the shoot–root coordination associated with the manifestation of the C4 traits, including efficient resource usage by comparing the mRNA content of hypocotyls before and after the C4 first leave's formation. Histological examination showed the presence of C3 anatomy in cotyledons and C4 anatomy in the FLs. Our transcriptome analyses verified the performance of the NAD-ME subtype of C4 in FLs and revealed differential transcript abundance of several potential mobile regulators and their associated receptors or transporters in two developmentally different hypocotyls of H. mollissima Bunge. These differentially expressed genes (DEGs) belong to diverse functional groups, including various transcription factor (TF) families, phytohormones metabolism, and signaling peptides, part of which could be related to hypocotyl development. Our findings support the higher nitrogen and water use efficiency associated with C4 photosynthetic and provide insights into the coordinated above- and under-ground tissue communication during the developmental transition of C3–C4 photosynthesis in this species.
- Subjects
COTYLEDONS; WATER efficiency; LIFE cycles (Biology); PLACENTA; NITROGEN in water; SIGNAL peptides
- Publication
Journal of Plant Growth Regulation, 2024, Vol 43, Issue 4, p1076
- ISSN
0721-7595
- Publication type
Article
- DOI
10.1007/s00344-023-11162-1