2018
DOI: 10.1111/nph.15458
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Multiple mechanisms explain how reduced KRP expression increases leaf size of Arabidopsis thaliana

Abstract: Although cell number generally correlates with organ size, the role of cell cycle control in growth regulation is still largely unsolved. We studied kip related protein (krp) 4, 6 and 7 single, double and triple mutants of Arabidopsis thaliana to understand the role of cell cycle inhibitory proteins in leaf development.We performed leaf growth and seed size analysis, kinematic analysis, flow cytometery, transcriptome analysis and mathematical modeling of G1/S and G2/M checkpoint progression of the mitotic and … Show more

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Cited by 16 publications
(11 citation statements)
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References 74 publications
(110 reference statements)
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“…The ICK/KRP protein family contains seven members, each of which has a conserved CDK‐binding domain in the C‐terminus (Kumar et al, 2015); for example, ICK1/KRP1 interacts with CDKA;1 and CYCD3;1 to inhibit their kinase activities, suppressing DNA replication and the onset of the mitotic cell cycle (Weinl et al, 2005). ICK1/KRP1 functions in a concentration‐dependent manner; high concentrations of this protein block the G1/S transition, while at low concentrations it inhibits the G2/M transition, thereby promoting endoreduplication (Weinl et al, 2005; Sizani et al, 2019).…”
Section: Introductionmentioning
confidence: 99%
“…The ICK/KRP protein family contains seven members, each of which has a conserved CDK‐binding domain in the C‐terminus (Kumar et al, 2015); for example, ICK1/KRP1 interacts with CDKA;1 and CYCD3;1 to inhibit their kinase activities, suppressing DNA replication and the onset of the mitotic cell cycle (Weinl et al, 2005). ICK1/KRP1 functions in a concentration‐dependent manner; high concentrations of this protein block the G1/S transition, while at low concentrations it inhibits the G2/M transition, thereby promoting endoreduplication (Weinl et al, 2005; Sizani et al, 2019).…”
Section: Introductionmentioning
confidence: 99%
“…Thus, even in Arabidopsis, cell enlargement can be accelerated without alterations in the levels of endoreduplication. For instance, a Kip - RELATED PROTEIN 2 ( KRP2 ) overexpression line exhibits very large cells in the leaf mesophyll tissue, while the endoreduplication level is decreased (De Veylder et al 2001, 2002; Sizani et al 2019). Additionally, the cell size changes in many of these reports are too large to be the result of altered endoreduplication level.…”
Section: Introductionmentioning
confidence: 99%
“…KRP7 acts redundantly with other KIP-proteins to control cell cycle progression and aspects of reproductive development by repression of the cell cycle regulator Retinoblastoma homologue RBR1 (Zhao et al, 2017, Verkest et al, 2005). Therefore, the higher abundance in samples from apomictic as compared to sexual ovules might be aiding the activation of cell cycle activity as a consequence of gradual downregulation of KRP activity (Sizani et al, 2019). Interestingly, also homologues of ESP3 are differentially regulated at distinct stages of reproductive development and between sexual and apomictic plants.…”
Section: Discussionmentioning
confidence: 99%