AI Article Synopsis
- The placenta in most plant fruits either shrinks or develops fleshy tissues as they mature; in poplars, it produces catkin fibers.
- Three specific MIXTA genes (PdeMIXTA02, PdeMIXTA03, PdeMIXTA04) were found to be expressed right after pollination in carpels, with PdeMIXTA04 promoting trichome density in Arabidopsis while the other two did not.
- The study also revealed that PdeMIXTA04 interacts with other proteins, shedding light on the molecular mechanisms behind poplar catkin differentiation.
Article Abstract
The placenta in fruits of most plants either desiccate and shrink as the fruits mature or develop further to form the fleshy tissues. In poplars, placental epidermal cells protrude collectively to produce catkin fibers. In this study, three carpel limited MIXTA genes, PdeMIXTA02, PdeMIXTA03, PdeMIXTA04, were find to specifically expressed in carpel immediately after pollination. Heterologous expression of the three genes in Arabidopsis demonstrated that PdeMIXTA04 significantly promoted trichomes density and could restore trichomes in the trichomeless mutant. By contrast, such functions were not observed with PdeMIXTA02, PdeMIXTA03. In situ hybridization revealed that PdeMIXTA04 was explicitly expressed in poplar placental epidermal cells. We also confirmed trichome-specific expression of the PdeMIXTA04 promoter. Multiple experimental proofs have confirmed the interaction between PdeMIXTA04, PdeMYC and PdeWD40, indicating PdeMIXTA04 functioned through the MYB-bHLH-WD40 ternary complex. Our work provided distinctive understanding of the molecular mechanism triggering differentiation of poplar catkins.
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| http://dx.doi.org/10.1016/j.ijbiomac.2023.124743 | DOI Listing |
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