<i>Crown rootless1</i>, Which Is Essential for Crown Root Formation in Rice, Is a Target of an AUXIN RESPONSE FACTOR in Auxin Signaling

Inukai, Yoshiaki; Sakamoto, Tomoaki; Ueguchi-Tanaka, Miyako; Shibata, Yohko; Gomi, Kenji; Umemura, Iichiro; Hasegawa, Yasuko; Ashikari, Motoyuki; Kitano, Hidemi; Matsuoka, Makoto

doi:10.1105/tpc.105.030981

Cited by 433 publications

(464 citation statements)

References 40 publications

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“…However, reduced auxin transport might not be the single reason for the complete lack of lateral roots in the mutant rum1. Exogenously applied auxin inhibits primary root elongation at increasing auxin concentrations and induces lateral roots (Chadwick and Burg, 1967;Hetz, 1996;Inukai et al, 2005;Liu et al, 2005). While the primary root of the mutant rum1 exhibited a normal response to exogenously applied auxin, i.e.…”

Section: Discussionmentioning

confidence: 99%

Isolation, Characterization, and Pericycle-Specific Transcriptome Analyses of the Novel Maize Lateral and Seminal Root Initiation Mutant rum1

Woll

Borsuk²,

Stransky³

et al. 2005

Plant Physiology

182

190

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The monogenic recessive maize (Zea mays) mutant rootless with undetectable meristems 1 (rum1) is deficient in the initiation of the embryonic seminal roots and the postembryonic lateral roots at the primary root. Lateral root initiation at the shoot-borne roots and development of the aerial parts of the mutant rum1 are not affected. The mutant rum1 displays severely reduced auxin transport in the primary root and a delayed gravitropic response. Exogenously applied auxin does not induce lateral roots in the primary root of rum1. Lateral roots are initiated in a specific cell type, the pericycle. Cell-type-specific transcriptome profiling of the primary root pericycle 64 h after germination, thus before lateral root initiation, via a combination of laser capture microdissection and subsequent microarray analyses of 12k maize microarray chips revealed 90 genes preferentially expressed in the wild-type pericycle and 73 genes preferentially expressed in the rum1 pericycle (fold change .2; P-value ,0.01; estimated false discovery rate of 13.8%). Among the 51 annotated genes predominately expressed in the wild-type pericycle, 19 genes are involved in signal transduction, transcription, and the cell cycle. This analysis defines an array of genes that is active before lateral root initiation and will contribute to the identification of checkpoints involved in lateral root formation downstream of rum1.

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Section: Discussionmentioning

confidence: 99%

Isolation, Characterization, and Pericycle-Specific Transcriptome Analyses of the Novel Maize Lateral and Seminal Root Initiation Mutant rum1

Woll

Borsuk²,

Stransky³

et al. 2005

Plant Physiology

182

190

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show abstract

“…The auxin insensitive rice mutant crl1/arl1 (crown rootless1/adventitious rootless1) defective in adventitious roots formation was identified (Inukai et al, 2005;Liu et al, 2005). CRL1/ARL1, an auxin-responsive gene, encodes a nuclear protein containing ASYMMETRIC LEAVES2 (AS2)/LATERAL ORGAN BOUNDARIES (LOB) domain (Inukai et al, 2005;Liu et al, 2005).…”

Section: Genes Asociated With the Adventitious Root Formationmentioning

confidence: 99%

Auxin Control in the Formation of Adventitious Roots

Pop

Pamfil

Bellini

2011

Not Bot Hort Agrobot Cluj

140

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Adventitious rooting is a complex process and a key step in the vegetative propagation of economically important woody, horticultural and agricultural species, playing an important role in the successful production of elite clones. The formation of adventitious roots is a quantitative genetic trait regulated by both environmental and endogenous factors. Among phytohormones, auxin plays an essential role in regulating roots development and it has been shown to be intimately involved in the process of adventitious rooting. Great progress has been made in elucidating the auxin-induced genes and auxin signaling pathway, especially in auxin response Aux/IAA and Auxin Response Factor gene families. Although some important aspects of adventitious and lateral rooting signaling have been revealed, the intricate signaling network remains poorly understood. This review summarizes some of the current knowledge on the physiological aspects of adventitious root formation and highlights the recent progress made in the identification of putative molecular players involved in the control of adventitious rooting. Despite much has been discovered regarding the effects and regulation of auxins on plant growth since the Darwin experiments, there is much that remains unknown.

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“…Arabidopsis LBD16, LBD29 and LBD18 have been found to be direct or indirect targets of AUXIN RESPONSE FACTORs (ARFs), ARF7 and ARF19, to synergistically regulate lateral root formation [27,28], demonstrating that LBD genes are directly involved in the auxin signal cascades in lateral root patterning. Rice CROWN ROOTLESS1 and maize ROOTLESS CON-CERNING CROWN AND SEMINAL ROOTS, two close homologues of Arabidopsis LBD29, regulate the formation of monocot-specific crown roots [29][30][31]. Recent studies also indicate that some of LBD members, such as Arabidopsis LBD37, LBD38, LBD39 and rice LBD37, are involved in the regulation of anthocyanin and nitrogen metabolism [32,33].…”

Section: Introductionmentioning

confidence: 99%

LATERAL ORGAN BOUNDARIES DOMAIN transcription factors direct callus formation in Arabidopsis regeneration

et al. 2012

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The remarkable regeneration capability of plant tissues or organs under culture conditions has underlain an extensive practice for decades. The initial step in plant in vitro regeneration often involves the induction of a pluripotent cell mass termed callus, which is driven by the phytohormone auxin and occurs via a root development pathway. However, the key molecules governing callus formation remain unknown. Here we demonstrate that Arabidopsis LATERAL ORGAN BOUNDARIES DOMAIN (LBD)/ASYMMETRIC LEAVES2-LIKE (ASL) transcription factors are involved in the control of callus formation program. The four LBD genes downstream of AUXIN RESPONSE FACTORs (ARFs), LBD16, LBD17, LBD18 and LBD29, are rapidly and dramatically induced by callus-inducing medium (CIM) in multiple organs. Ectopic expression of each of the four LBD genes in Arabidopsis is sufficient to trigger spontaneous callus formation without exogenous phytohormones, whereas suppression of LBD function inhibits the callus formation induced by CIM. Moreover, the callus triggered by LBD resembles that induced by CIM by characteristics of ectopically activated root meristem genes and efficient regeneration capacity. These findings define LBD transcription factors as key regulators in the callus induction process, thereby establishing a molecular link between auxin signaling and the plant regeneration program.

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Crown rootless1, Which Is Essential for Crown Root Formation in Rice, Is a Target of an AUXIN RESPONSE FACTOR in Auxin Signaling

Cited by 433 publications

References 40 publications

Isolation, Characterization, and Pericycle-Specific Transcriptome Analyses of the Novel Maize Lateral and Seminal Root Initiation Mutant rum1

Isolation, Characterization, and Pericycle-Specific Transcriptome Analyses of the Novel Maize Lateral and Seminal Root Initiation Mutant rum1

Auxin Control in the Formation of Adventitious Roots

LATERAL ORGAN BOUNDARIES DOMAIN transcription factors direct callus formation in Arabidopsis regeneration

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