OsEIL1, a Rice Homolog of the Arabidopsis EIN3 Regulates the Ethylene Response as a Positive Component

Mao, Chuanzao; Wang, Shaomin; Jia, Qiaojun; Wu, Ping

doi:10.1007/s11103-005-6184-1

Cited by 117 publications

(106 citation statements)

References 38 publications

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“…Transcriptional regulation by ethylene has been reported for other ERF VII genes, including OsEBP89/ OsERF60 and OsEBP2/OsERF72 in rice (Yang et al, 2002;Mao et al, 2006;Lin et al, 2007), RAP2.2 in Arabidopsis (Hinz et al, 2010), and HvRAF (for H. vulgare root abundant factor), the only characterized member of this group in barley (Jung et al, 2007). BEIL1 is related to Ethylene Insensitive (EIN) 3-Like (EIL) transcription factors from Arabidopsis (Chao et al, 1997) and rice (Mao et al, 2006;Supplemental Table S2; Supplemental Fig. S3B).…”

Section: Kibp Genes: Sequence and Phylogenetic Analysesmentioning

confidence: 93%

Cross Talk between the KNOX and Ethylene Pathways Is Mediated by Intron-Binding Transcription Factors in Barley

et al. 2010

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In the barley (Hordeum vulgare) Hooded (Kap) mutant, the duplication of a 305-bp intron sequence leads to the overexpression of the Barley knox3 (Bkn3) gene, resulting in the development of an extra flower in the spikelet. We used a one-hybrid screen to identify four proteins that bind the intron-located regulatory element (Kap intron-binding proteins). Three of these, Barley Ethylene Response Factor1 (BERF1), Barley Ethylene Insensitive Like1 (BEIL1), and Barley Growth Regulating Factor1 (BGRF1), were characterized and their in vitro DNA-binding capacities verified. Given the homology of BERF1 and BEIL1 to ethylene signaling proteins, we investigated if these factors might play a dual role in intron-mediated regulation and ethylene response. In transgenic rice (Oryza sativa), constitutive expression of the corresponding genes produced phenotypic alterations consistent with perturbations in ethylene levels and variations in the expression of a key gene of ethylene biosynthesis. In barley, ethylene treatment results in partial suppression of the Kap phenotype, accompanied by up-regulation of BERF1 and BEIL1 expression, followed by down-regulation of Bkn3 mRNA levels. In rice protoplasts, BEIL1 activates the expression of a reporter gene driven by the 305-bp intron element, while BERF1 can counteract this activation. Thus, BEIL1 and BERF1, likely in association with other Kap intron-binding proteins, should mediate the fine-tuning of Bkn3 expression by ethylene. We propose a hypothesis for the cross talk between the KNOX and ethylene pathways.Organogenesis in plants is a continuous process involving meristems, populations of pluripotent cells. The shoot apical meristem (SAM) is formed during embryogenesis and initiates organ primordia in postembryonic growth. SAM activity entails two contrasting processes: the slow proliferation of cells in the central zone, necessary for meristem maintenance, and the recruitment of cells at the meristem flanks, where lateral organ primordia are initiated (Scofield and Murray, 2006).Knotted1-like homeobox (KNOX) genes represent an ancient class of transcription factors present in all examined plant species as well as in single-cell green and red algae (Mukherjee et al., 2009). A subset of this gene family (class I KNOX genes) regulates SAM functions in both monocots and dicots. KNOX I genes play pivotal roles not only in SAM formation and maintenance but also in morphogenetic processes throughout plant development (Hake et al., 2004): they contribute to cell fate and cell differentiation of vegetative (Vollbrecht et al., 1991;Becraft and Freeling, 1994) and reproductive (Mü ller et al., 1995; WilliamsCarrier et al., 1997) tissues.KNOX I genes encode transcription factors belonging to the TALE-homeobox superfamily (Bü rglin,

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Section: Kibp Genes: Sequence and Phylogenetic Analysesmentioning

confidence: 93%

Cross Talk between the KNOX and Ethylene Pathways Is Mediated by Intron-Binding Transcription Factors in Barley

et al. 2010

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“…Remarkably, in the dark, rice has a double response to ethylene (promoted coleoptile elongation and inhibited root growth) (Ma et al, 2010(Ma et al, , 2013Yang et al, 2015) that is different from the Arabidopsis triple response (short hypocotyl, short root, and exaggerated apical hook) (Bleecker and Kende, 2000). Several homologous genes of Arabidopsis ethylene signaling components have been identified in rice, such as the receptors, RTE1-like gene, EIN2-like gene, EIN3-like gene, CTR2, and ETHYLENE RESPONSE FACTOR (ERF) (Cao et al, 2003;Jun et al, 2004;Mao et al, 2006;Rzewuski and Sauter, 2008;Wuriyanghan et al, 2009;Zhang et al, 2012;Ma et al, 2013;Wang et al, 2013). We previously studied the kinase activity of rice ETR2 and the roles of ETR2 in flowering and in starch accumulation (Wuriyanghan et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Ethylene Responses in Rice Roots and Coleoptiles Are Differentially Regulated by a Carotenoid Isomerase-Mediated Abscisic Acid Pathway

et al. 2015

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Ethylene and abscisic acid (ABA) act synergistically or antagonistically to regulate plant growth and development. ABA is derived from the carotenoid biosynthesis pathway. Here, we analyzed the interplay among ethylene, carotenoid biogenesis, and ABA in rice (Oryza sativa) using the rice ethylene response mutant mhz5, which displays a reduced ethylene response in roots but an enhanced ethylene response in coleoptiles. We found that MHZ5 encodes a carotenoid isomerase and that the mutation in mhz5 blocks carotenoid biosynthesis, reduces ABA accumulation, and promotes ethylene production in etiolated seedlings. ABA can largely rescue the ethylene response of the mhz5 mutant. Ethylene induces MHZ5 expression, the production of neoxanthin, an ABA biosynthesis precursor, and ABA accumulation in roots. MHZ5 overexpression results in enhanced ethylene sensitivity in roots and reduced ethylene sensitivity in coleoptiles. Mutation or overexpression of MHZ5 also alters the expression of ethylene-responsive genes. Genetic studies revealed that the MHZ5-mediated ABA pathway acts downstream of ethylene signaling to inhibit root growth. The MHZ5-mediated ABA pathway likely acts upstream but negatively regulates ethylene signaling to control coleoptile growth. Our study reveals novel interactions among ethylene, carotenogenesis, and ABA and provides insight into improvements in agronomic traits and adaptive growth through the manipulation of these pathways in rice.

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“…In rice (Oryza sativa), ethylene receptor genes, EIN2-like and EIN3-like, have also been cloned, and the functions of the EIN2-like and EIL1 genes have been analyzed (Cao et al, 2003;Cao, 2004;Jun et al, 2004;Watanabe et al, 2004;Yau et al, 2004;Mao et al, 2006). The rice ethylene receptor gene family has five members, including Protein Kinase1 (PK1)/ETR2/ETHYLENE RESPONSE2 like1 (ERL1), PK2/ETR3, PK3/ETR4, ERS1, and ERS2.…”

Section: Introductionmentioning

confidence: 99%

The Ethylene Receptor ETR2 Delays Floral Transition and Affects Starch Accumulation in Rice

et al. 2009

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Ethylene regulates multiple aspects of plant growth and development in dicotyledonous plants; however, its roles in monocotyledonous plants are poorly known. Here, we characterized a subfamily II ethylene receptor, ETHYLENE RESPONSE2 (ETR2), in rice (Oryza sativa). The ETR2 receptor with a diverged His kinase domain is a Ser/Thr kinase, but not a His kinase, and can phosphorylate its receiver domain. Mutation of the N box of the kinase domain abolished the kinase activity of ETR2. Overexpression of ETR2 in transgenic rice plants reduced ethylene sensitivity and delayed floral transition. Conversely, RNA interference (RNAi) plants exhibited early flowering and the ETR2 T-DNA insertion mutant etr2 showed enhanced ethylene sensitivity and early flowering. The effective panicles and seed-setting rate were reduced in the ETR2-overexpressing plants, while thousand-seed weight was substantially enhanced in both the ETR2-RNAi plants and the etr2 mutant compared with controls. Starch granules accumulated in the internodes of the ETR2-overexpressing plants, but not in the etr2 mutant. The GIGANTEA and TERMINAL FLOWER1/CENTRORADIALIS homolog (RCN1) that cause delayed flowering were upregulated in ETR2-overexpressing plants but downregulated in the etr2 mutant. Conversely, the a-amylase gene RAmy3D was suppressed in ETR2-overexpressing plants but enhanced in the etr2 mutant. Thus, ETR2 may delay flowering and cause starch accumulation in stems by regulating downstream genes.

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OsEIL1, a Rice Homolog of the Arabidopsis EIN3 Regulates the Ethylene Response as a Positive Component

Cited by 117 publications

References 38 publications

Cross Talk between the KNOX and Ethylene Pathways Is Mediated by Intron-Binding Transcription Factors in Barley

Cross Talk between the KNOX and Ethylene Pathways Is Mediated by Intron-Binding Transcription Factors in Barley

Ethylene Responses in Rice Roots and Coleoptiles Are Differentially Regulated by a Carotenoid Isomerase-Mediated Abscisic Acid Pathway

The Ethylene Receptor ETR2 Delays Floral Transition and Affects Starch Accumulation in Rice

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