Evolutionary-conserved RLF, a cytochrome b5-like heme-binding protein, regulates organ development in Marchantia polymorpha
Year: 2025
Type: article
Abstract: In Arabidopsis thaliana, REDUCED LATERAL ROOT FORMATION (RLF), a cytochrome b5-like heme-binding domain (Cytb5-HBD) protein, is necessary for proper lateral root (LR) formation. Whereas the other Cytb5-HBD proteins in A. thaliana regulate different metabolic reactions, RLF is unique as it specifically regulates organ development. However, it remains unknown whether heme binding to RLF is necessary for its function and whether RLF orthologs in different plant species also regulate organ development. / We demonstrate that RLF binds to heme in vitro and that two histidine residues, which are conserved among Cytb5-HBD, are crucial for both heme binding and its biological function in A. thaliana. In addition, we show that MpRLF, a RLF ortholog in the bryophyte Marchantia polymorpha, also binds to heme in vitro and that MpRLF rescues the LR formation phenotype of the A. thaliana rlf mutant. / Mprlfge, the loss-of-function mutation in MpRLF, resulted in delayed thallus growth and inhibited both gemma cup and reproductive organ formation. / Our findings indicate that MpRLF is essential for proper vegetative and reproductive development in M. polymorpha. This suggests that RLF-dependent redox reaction systems are conserved across diverse plant species and were independently co-opted for organ development in bryophyte and seed plant evolution.
Authors: Iwata, P. Kentaro, Shimizu, Takayuki, Sakai, Yuuki, 酒井, 友希, サカイ, ユウキ, Furuya, Tomoyuki, 古谷, 朋之, フルヤ, トモユキ, Fukumura, Hinatamaru, Kondo, Yuki, 近藤, 侑貴, コンドウ, ユウキ, Masuda, Tatsuru, Ishizaki, Kimitsune, 石崎, 公庸, イシザキ, キミツネ, Fukaki, Hidehiro, 深城, 英弘, フカキ, ヒデヒロ
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: green
Awards: 植物細胞におけるABCトランスポーターを介した色素体からのヘム輸送機構の解明, G3045067037, G3538983779, G4061579142, G4190944328, G4445348710, G4797453899, 環状化硫黄S8による超硫黄分子シグナル伝達の制御機構, G509276038, G6106246839, G6322335589, Molecular mechanisms for dormancy of clonal propagules in a bryophyte, G6913231592, G8512719246, 先端的植物バイオものづくり基盤の構築
OpenAlex ID: W7047122518
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