The rice EP3 and OsFBK1 E3 ligases alter plant architecture and flower development, and affect transcript accumulation of microRNA pathway genes and their targets.

The rice EP3 and OsFBK1 E3 ligases alter plant architecture and flower development, and affect transcript accumulation of microRNA pathway genes and their targets.
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DOI:
10.1111/pbi.13710
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发表时间:
2022-03
影响因子:
13.8
通讯作者:
Gonzalez-Carranza ZH
Gonzalez-Carranza ZH
中科院分区:
工程技术1区
文献类型:
--
作者:
Borna RS;Murchie EH;Pyke KA;Roberts JA;Gonzalez-Carranza ZH

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ERECTA PANICLE 3 (EP3) 和 ORYZA SATIVA F-BOX KELCH 1 (OsFBK1) 蛋白与拟南芥 F-box 蛋白 HAWAIIAN SKIRT (HWS) 具有 57% 和 54% 的序列同一性。之前我们表明 EP3 是 HWS 的功能直系同源物。在这里,我们证明了 OsFBK1 是 HWS 的另一个功能直系同源物,并显示了 EP3 和 OsFBK1 基因在植物不同发育阶段之间相互作用的复杂性。 qRT-PCR 表达分析和 EP3-GFP 和 OsFBK1-RFP 启动子报告基因系的研究表明,尽管可以在同一组织中检测到 EP3 和 OsFBK1 表达,但有些细胞只表达 EP3 或 OsFBK1,而其他细胞则共同表达这两种基因。 EP3 和 OsFBK1 的功能丧失、减少或获得,表明 EP3 和 OsFBK1 影响植物结构、器官大小、花器官数量和大小、花形态、花粉活力、籽粒大小和重量。我们已经鉴定了水稻 microRNA 通路中 ORYZA SATIVA DAWDLE (OsDDL) 和 ORYZA SATIVA SERRATE (OsSE) 的假定直系同源基因,并证明 EP3 和 OsFBK1 影响它们的转录水平以及 CROWN ROOT DEFECT 1/ORYZA SATIVA Exportin‐5 HASTY (CRD1/OsHST)、ORYZA SATIVA 的转录水平DICER-LIKE 1 (OsDCL) 和 ORYZA SATIVA WEAVY LEAF1 (OsWAF1)。我们发现 EP3 影响 OsPri-MIR164、OsNAM1 和 OsNAC1 转录水平。 OsNAC1 转录物被 OsFBK1 修饰,表明有两种独立的调节途径,一种通过 EP3 和 OsMIR164,另一种通过 OsFBK1。我们的数据表明,EP3 和 OsFBK1 在水稻中共同发挥的作用与 HWS 在拟南芥中的作用相似。
ERECTA PANICLE 3 (EP3) and ORYZA SATIVA F‐BOX KELCH 1 (OsFBK1) proteins share 57% and 54% sequence identity with the Arabidopsis F‐box protein HAWAIIAN SKIRT (HWS). Previously we showed that EP3 is a functional orthologue of HWS. Here we demonstrate that OsFBK1 is another functional orthologue of HWS and show the complexity of interaction between EP3 and OsFBK1 genes at different developmental stages of the plant. qRT‐PCR expression analyses and studies of EP3‐GFP and OsFBK1‐RFP promoter reporter lines demonstrate that although EP3 and OsFBK1 expression can be detected in the same tissues some cells exclusively express EP3 or OsFBK1 whilst others co‐express both genes. Loss, reduction or gain‐of‐function lines for EP3 and OsFBK1, show that EP3 and OsFBK1 affect plant architecture, organ size, floral organ number and size, floral morphology, pollen viability, grain size and weight. We have identified the putative orthologue genes of the rice microRNA pathway for ORYZA SATIVA DAWDLE (OsDDL) and ORYZA SATIVA SERRATE (OsSE), and demonstrated that EP3 and OsFBK1 affect their transcript levels as well as those of CROWN ROOT DEFECT 1/ORYZA SATIVA Exportin‐5 HASTY (CRD1/OsHST), ORYZA SATIVA DICER‐LIKE 1 (OsDCL) and ORYZA SATIVA WEAVY LEAF1 (OsWAF1). We show that EP3 affects OsPri‐MIR164, OsNAM1 and OsNAC1 transcript levels. OsNAC1 transcripts are modified by OsFBK1, suggesting two independent regulatory pathways, one via EP3 and OsMIR164 and the other via OsFBK1. Our data propose that EP3 and OsFBK1 conjointly play similar roles in rice to how HWS does in Arabidopsis.
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