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| Open AccessArabidopsis TCP4 transcription factor inhibits high temperature-induced homeotic conversion of ovules
Global warming threatens food security and plant survival. This paper demonstrates that Class II TCP transcription factors are critical for specifying ovule identity and inhibiting the conversion of ovules into carpelloids under high temperature.
- Jingqiu Lan
- , Ning Wang
- & Genji Qin
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Article
| Open AccessOBERON3 and SUPPRESSOR OF MAX2 1-LIKE proteins form a regulatory module driving phloem development
The phloem tissue is the main transport route for sugars in plant bodies. This study reveals a nuclear protein complex consisting of SMXL5 and OBE3 to be essential for phloem development by establishing a phloem-specific chromatin conformation.
- Eva-Sophie Wallner
- , Nina Tonn
- & Thomas Greb
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| Open AccessEpidermal injury-induced derepression of key regulator ATML1 in newly exposed cells elicits epidermis regeneration
In many plants, only the outermost cells are specified into the epidermis, with underlying mechanisms unknown. Here, the authors show that a key epidermis identity gene is activated in surface cells, via positional cues involving mechanical signals.
- Hiroyuki Iida
- , Ari Pekka Mähönen
- & Shinobu Takada
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Article
| Open AccessHistone H3.3 deposition in seed is essential for the post-embryonic developmental competence in Arabidopsis
Producing vigorous seeds that can germinate and establish seedlings is vital for plant propagation. Here, the authors report the critical function of histone variant H3.3 in establishing chromatin accessibility and seed vigour in Arabidopsis.
- Ting Zhao
- , Jingyun Lu
- & Danhua Jiang
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Article
| Open AccessSpecification of female germline by microRNA orchestrated auxin signaling in Arabidopsis
In most flowering plants, a single megaspore mother cell (MMC) is formed in each ovule. Here the authors show that miR160 and the auxin response factor ARF17 act to promote MMC fate via SPL/NZZ and control auxin signaling to prevent somatic cells from acquiring MMC fate.
- Jian Huang
- , Lei Zhao
- & Dazhong Zhao
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Article
| Open AccessConserved signalling components coordinate epidermal patterning and cuticle deposition in barley
The leaf epidermis is sealed by a lipid-rich cuticle to prevent water loss and interspersed with stomatal pores to allow gas exchange. Here the authors provide evidence that two barley proteins, HvYDA1 and HvBRX-Solo, regulate both processes linking epidermal patterning with cuticular properties in a cereal crop.
- Linsan Liu
- , Sarah B. Jose
- & Sarah M. McKim
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Article
| Open AccessROS homeostasis mediated by MPK4 and SUMM2 determines synergid cell death
Synergid cells undergo programmed cell death following pollen tube reception and successful fertilization. Here the authors show that premature synergid cell death is prevented by the mitogen activated protein kinase MPK4 and the R protein SUMM2 which maintain ROS homeostasis in Arabidopsis.
- Ronny Völz
- , William Harris
- & Yong-Hwan Lee
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Article
| Open AccessThe regulatory landscape of Arabidopsis thaliana roots at single-cell resolution
Existing studies of the chromatin accessibility, the primary mark of regulatory DNA, in Arabidopsis are based mainly on bulk samples. Here, the authors report the regulatory landscape of Arabidopsis thaliana roots at single-cell resolution.
- Michael W. Dorrity
- , Cristina M. Alexandre
- & Josh T. Cuperus
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Article
| Open AccessSingle-cell transcriptome atlas and chromatin accessibility landscape reveal differentiation trajectories in the rice root
Root meristems give rise to distinct cell types that differentiate across defined temporal and spatial gradients. Here, via single-cell RNA sequencing and surveying chromatin accessibility the authors profile gene expression of different cell types during rice root development.
- Tian-Qi Zhang
- , Yu Chen
- & Jia-Wei Wang
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Article
| Open AccessH2AK121ub in Arabidopsis associates with a less accessible chromatin state at transcriptional regulation hotspots
Polycomb Group complexes maintain gene repression through the incorporation of H2AK121ub and H3K27me3. Here, the authors show that H2AK121ub marks less accessible but transcriptionally permissive chromatin, while H3K27me3 enforces a repressed transcriptionally less-permissive state.
- Xiaochang Yin
- , Francisco J. Romero-Campero
- & Yue Zhou
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Article
| Open AccessThe liverwort oil body is formed by redirection of the secretory pathway
Liverworts have a unique oil body organelle unrelated to lipid stores found in other eukaryotes. Here the authors show that oil body formation is analogous to that of cell plates, relying on periodic redirection of the secretory pathway and a syntaxin-1 homolog, and that oil bodies contribute to defence against herbivory.
- Takehiko Kanazawa
- , Hatsune Morinaka
- & Takashi Ueda
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Article
| Open AccessA signal cascade originated from epidermis defines apical-basal patterning of Arabidopsis shoot apical meristems
A concentration gradient of HAM transcription factors specifies apical-basal patterning in the Arabidopsis shoot apical meristem. Here, the authors show that epidermal expression of the ATML1 transcription factor defines this concentration gradient via activation of mobile micro RNA.
- Han Han
- , An Yan
- & Yun Zhou
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Article
| Open AccessWUSCHEL acts as an auxin response rheostat to maintain apical stem cells in Arabidopsis
Spatial control of auxin signaling maintains a balance between stem-cell self-renewal and differentiation at the plant shoot apex. Here Ma et al. show that rheostatic control of auxin response by the WUSCHEL transcription factor maintains stem cells by conferring resistance to auxin mediated differentiation.
- Yanfei Ma
- , Andrej Miotk
- & Jan U. Lohmann
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Article
| Open AccessQUIRKY regulates root epidermal cell patterning through stabilizing SCRAMBLED to control CAPRICE movement in Arabidopsis
SCM is a receptor-like kinase that ensures proper root patterning. Here, Song et al. find that SCM promotes the movement of CPC from non-hair cells to neighboring root epidermal cells and identify QKY as an additional facilitator of CPC mobility that acts by preventing vacuolar degradation of SCM.
- Jae Hyo Song
- , Su-Hwan Kwak
- & Myeong Min Lee
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| Open AccessA gene expression map of shoot domains reveals regulatory mechanisms
The shoot apical meristem (SAM) maintains stem cells and generates new leaves and flowers from its periphery. Here via spatially resolved translatome profiling, Tian et al. define distinct molecular signatures of different SAM and leaf domains and identify regulators of axillary meristem initiation.
- Caihuan Tian
- , Ying Wang
- & Yuling Jiao