Featured
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Article
| Open Access
A hierarchical transcriptional network activates specific CDK inhibitors that regulate G2 to control cell size and number in Arabidopsis
Cell division and expansion are carefully coordinated during organ growth. Here, the authors show that the SCL28 and SMOS1 transcription factors interact to regulate cyclin-dependent kinase inhibitors and promote cell size increase over division in Arabidopsis.
- Yuji Nomoto
- , Hirotomo Takatsuka
- & Masaki Ito
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Article
| Open Access
SWITCH 1/DYAD is a WINGS APART-LIKE antagonist that maintains sister chromatid cohesion in meiosis
During cell division, Soronin antagonises WAPL to prevent premature loss of sister chromatid cohesion. Here the authors show that, despite a lack of sequence similarity, the Arabidopsis SWI1 protein functions as a novel Soronin-like WAPL antagonist, suggesting convergent evolution with animals.
- Chao Yang
- , Yuki Hamamura
- & Arp Schnittger
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Article
| Open Access
Cell-size dependent progression of the cell cycle creates homeostasis and flexibility of plant cell size
The mechanistic coupling of cell growth and cell cycle control with cell size regulation in tissues is not well understood. Here, the authors show that within the shoot apical meristem of Arabidopsis cell size depends on developmental stage, genotype and environmental signals; however cell growth and cell division are cell-autonomously coordinated.
- Angharad R. Jones
- , Manuel Forero-Vargas
- & James A. H. Murray
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Endopolyploidization and flowering time are antagonistically regulated by checkpoint component MAD1 and immunity modulator MOS1
The spindle assembly checkpoint (SAC) complex is involved in mitotic quality control in yeast and animals. Here Bao et al. demonstrate that in plants, the SAC complex component MAD1 acts antagonistically to the immune regulator MOS1 to influence endopolyploidization and flowering time.
- Zhilong Bao
- , Ning Zhang
- & Jian Hua
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Article
| Open Access
Germination and infectivity of microconidia in the rice blast fungus Magnaporthe oryzae
The rice blast fungus Magnaporthe oryzae produces large and small spores, and the role played by the small spores (microconidia) in plant infection is unknown. Here, Zhang et al.show that the microconidia can cause disease by infecting plants through wounds or flowering heads.
- Huili Zhang
- , Zhongshou Wu
- & Jin-Rong Xu
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A protein phosphatase 2A complex spatially controls plant cell division
Spatial positioning of the division plane in plant cells is determined premitotically by the preprophase band of microtubules. Spinner et al. show that its formation in Arabidopsisrequires a PP2A complex containing FASS and TON1 which is recruited to cortical microtubules by the TRM protein family.
- Lara Spinner
- , Astrid Gadeyne
- & Martine Pastuglia
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Article
| Open Access
Degradation of MONOCULM 1 by APC/CTAD1 regulates rice tillering
MONOCULM1 is a transcriptional regulator that controls rice tillering and therefore grain yield. In this study the authors demonstrate that MONOCULM1 interacts with TAD1, forming a complex which activates APC and targets MONOCULM1 for degradation.
- Cao Xu
- , Yonghong Wang
- & Jiayang Li
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Article
| Open Access
RSS1 regulates the cell cycle and maintains meristematic activity under stress conditions in rice
Cell proliferation in plant meristems is often altered during conditions of stress. In this study, the authors identify a plant protein, RSS1, that is regulated in a cell-cycle dependent manner and is required to maintain shoot and root meristems in the presence of abiotic stress.
- Daisuke Ogawa
- , Kiyomi Abe
- & Shin Takeda
Distinct roles of Arabidopsis ORC1 proteins in DNA replication and heterochromatic H3K27me1 deposition