RPK2 functions in diverged CLE signaling

Abstract

Shoot apical meristem is a well organized undifferentiated tissue which produces plant body. CLV3 peptide hormone regulates SAM homeostasis, and is perceived by several receptor complexes, CLV1, CLV2-SOL2/CRN, and RPK2. CLV1 homologues are encoded in various plants genome. However CLV2 and SOL2/CRN homologues are found only in higher plants. Here we show that the RPK2 homologues were found not only in moss, Physcomitrella patens, but also in liverwort, Marchantia polymorpha. Although CLV2-SOL2/CRN might have specific function in SAM homeostasis, CLV1 and RPK2 may regulate various plant physiological events during plant evolution.

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Figures and Tables

Figure 1 A neighbor-joining tree of RPK2. Protein sequence of RPK2 homologues of Arabidopsis thaliana (RPK2 and CLV1 as an out group), Musa acuminata (MaRPK2: ABF72006.1), Oryza sativa Indica Group (OsIRPK21: EAY91907.1, OsIRPK22: EAZ04623.1), Oryza sativa Japonica Group (OsJRPK21: NP_001051315.1, OsJRPK22: NP_001060207.1), Populus trichocarpa (PtRPK21: XP_002305358.1, PtRPK22: XP_002311344.1, PtRPK23: XP_002321080.1, PtRPK24: XP_002323902.1), Vitis vinifera (VvRPK21: CAN67126.1, VvRPK22: CAN77668.1, VvRPK23: CAO40245.1, VvRPK24: CAO41857.1, VvRPK25: CAO49170.1, VvRPK26: XP_002274047.1, VvRPK27: XP_002274211.1, VvRPK28: XP_002276030.1, VvRPK29: XP_002279979.1), Sorghum bicolor (SbRPK21: XP_002460974.1, SbRPK22: XP_002462751.1, SbRPK23 XP_002463860.1), Ricinus communis (RcRPK21: XP_002512071.1, RcRPK22: XP_002512822.1, RcRPK23: XP_002515143.1, RcRPK24: XP_002527617.1), Physcomitrella patens (PpRPK2: XP_001781758.1) and Marchantia polymorpha (MpRPK2: isotig22424), were used to construct the phylogenic tree. Bootstrap values of 60% and above, from the neighbor-joining method with Kimura's correction, are shown. The scale bar indicates the number of amino acid substitutions per site.

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