AINTEGUMENTA-LIKE proteins: hubs in a plethora of networks

Horstman, Anneke; Willemsen, Viola; Boutilier, Kim; Heidstra, Renze

doi:10.1016/j.tplants.2013.10.010

Cited by 157 publications

(145 citation statements)

References 151 publications

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“…They additionally regulate and require the shoot promoting factors CUC1 and CUC2 to complete the process (Fig.7 K iii, iv). PLT-like genes are present in multiple plant species [15,35]. It is tempting to speculate that a PLT-mediated mechanistic module might be utilized as a common strategy to regenerate desired organs in plant species where de novo shoot regeneration is naturally blocked at intermediate developmental phases.…”

Section: Discussionmentioning

confidence: 99%

PLETHORA Genes Control Regeneration by a Two-Step Mechanism

et al. 2015

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SummaryBackground-Regeneration, a remarkable example of developmental plasticity displayed by both plants and animals, involves successive developmental events driven in response to environmental cues. Despite decades of study on the ability of the plant tissues to regenerate complete fertile shoot system after inductive cues, the mechanisms by which cells acquire pluripotency and subsequently regenerate complete organs remain unknown.

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Section: Discussionmentioning

confidence: 99%

PLETHORA Genes Control Regeneration by a Two-Step Mechanism

et al. 2015

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“…BBM belongs to a gene clade that also includes AINTEGUMENTA ( ANT ) and six other AIL / PLETHORA ( PLT ) genes (Horstman, Willemsen, Boutilier, & Heidstra, 2014). Arabidopsis BBM and the other arabidopsis AIL / PLT genes are expressed in the embryo and the root and/or shoot meristems, where they act redundantly to maintain embryo growth and to define and maintain the stem cell niches (Aida et al., 2004; Galinha et al., 2007; Mudunkothge & Krizek, 2012).…”

Section: A Network Of Arabidopsis Transcription Factors Controls Somamentioning

confidence: 99%

“…Genetic analysis has shown that AIL proteins interact with auxin pathways throughout plant development (reviewed in Horstman et al., 2014). AIL5 also directly regulates YUC4 expression to control shoot phyllotaxis (Pinon, Prasad, Grigg, Sanchez‐Perez, & Scheres, 2013).…”

Section: A Network Of Arabidopsis Transcription Factors Controls Somamentioning

confidence: 99%

A transcriptional view on somatic embryogenesis

2017

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Somatic embryogenesis is a form of induced plant cell totipotency where embryos develop from somatic or vegetative cells in the absence of fertilization. Somatic embryogenesis can be induced in vitro by exposing explants to stress or growth regulator treatments. Molecular genetics studies have also shown that ectopic expression of specific embryo‐ and meristem‐expressed transcription factors or loss of certain chromatin‐modifying proteins induces spontaneous somatic embryogenesis. We begin this review with a general description of the major developmental events that define plant somatic embryogenesis and then focus on the transcriptional regulation of this process in the model plant Arabidopsis thaliana (arabidopsis). We describe the different somatic embryogenesis systems developed for arabidopsis and discuss the roles of transcription factors and chromatin modifications in this process. We describe how these somatic embryogenesis factors are interconnected and how their pathways converge at the level of hormones. Furthermore, the similarities between the developmental pathways in hormone‐ and transcription‐factor‐induced tissue culture systems are reviewed in the light of our recent findings on the somatic embryo‐inducing transcription factor BABY BOOM.

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“…This study presents the first demonstration, to our knowledge, of function for a gene cloned from a naturally occurring apomictic plant that encodes a key component controlling parthenogenesis. embryo differentiation, and root formation (11). Ectopic expression of the BBM gene in Arabidopsis led to the formation of somatic embryos on seedlings (8), and deletion of the bbm-1 domain eliminated the ability of transgenic plants to induce somatic embryogenesis on cotyledons in transformed Arabidopsis (10).…”

Section: Significancementioning

confidence: 99%

A parthenogenesis gene of apomict origin elicits embryo formation from unfertilized eggs in a sexual plant

Conner

Mookkan

Huo

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

165

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Apomixis is a naturally occurring mode of asexual reproduction in flowering plants that results in seed formation without the involvement of meiosis or fertilization of the egg. Seeds formed on an apomictic plant contain offspring genetically identical to the maternal plant. Apomixis has significant potential for preserving hybrid vigor from one generation to the next in highly productive crop plant genotypes. Apomictic Pennisetum/Cenchrus species, members of the Poaceae (grass) family, reproduce by apospory. Apospory is characterized by apomeiosis, the formation of unreduced embryo sacs derived from nucellar cells of the ovary and, by parthenogenesis, the development of the unreduced egg into an embryo without fertilization. In Pennisetum squamulatum (L.) R.Br., apospory segregates as a single dominant locus, the aposporyspecific genomic region (ASGR). In this study, we demonstrate that the PsASGR-BABY BOOM-like (PsASGR-BBML) gene is expressed in egg cells before fertilization and can induce parthenogenesis and the production of haploid offspring in transgenic sexual pearl millet. A reduction of PsASGR-BBML expression in apomictic F 1 RNAi transgenic plants results in fewer visible parthenogenetic embryos and a reduction of embryo cell number compared with controls. Our results endorse a key role for PsASGR-BBML in parthenogenesis and a newly discovered role for a member of the BBM-like clade of APETALA 2 transcription factors. Induction of parthenogenesis by PsASGR-BBML will be valuable for installing parthenogenesis to synthesize apomixis in crops and will have further application for haploid induction to rapidly obtain homozygous lines for breeding.apomixis | parthenogenesis | AP2 transcription factor | BABY BOOM | Pennisetum

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AINTEGUMENTA-LIKE proteins: hubs in a plethora of networks

Cited by 157 publications

References 151 publications

PLETHORA Genes Control Regeneration by a Two-Step Mechanism

PLETHORA Genes Control Regeneration by a Two-Step Mechanism

A transcriptional view on somatic embryogenesis

A parthenogenesis gene of apomict origin elicits embryo formation from unfertilized eggs in a sexual plant

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