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Multiple mechanisms explain how reduced KRP expression increases leaf size of Arabidopsis thaliana

(2019) NEW PHYTOLOGIST. 221(3). p.1345-1358
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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 endoreplication cycle. Double and triple mutants progressively increased mature leaf size, because of elevated expression of cell cycle and DNA replication genes stimulating progression through the division and endoreplication cycle. However, cell number was also already increased before leaf emergence, as a result of an increased cell number in the embryo. We show that increased embryo and seed size in krp4/6/7 results from seed abortion, presumably reducing resource competition, and that seed size differences contribute to the phenotype of several large-leaf mutants. Our results provide a new mechanistic understanding of the role of cell cycle regulation in leaf development and highlight the contribution of the embryo to the development of leaves after germination in general.
Keywords
Arabidopsis thaliana, cell division, endoreplication, kinematic analysis, Kip Related Proteins, leaf development, seed abortion, DEPENDENT KINASE INHIBITOR, CELL-CYCLE REGULATION, SEED SIZE, CENTROMERE COHESION, PLANT, GROWTH, ORGAN, PROLIFERATION, ENDOREDUPLICATION, PROTEIN

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Chicago
Sizani, Bulelani L, Shweta Kalve, Marios N Markakis, Malgorzata A Domagalska, Joanna Stelmaszewska, Hamada AbdElgawad, Xin’ai Zhao, et al. 2019. “Multiple Mechanisms Explain How Reduced KRP Expression Increases Leaf Size of Arabidopsis Thaliana.” New Phytologist 221 (3): 1345–1358.
APA
Sizani, B. L., Kalve, S., Markakis, M. N., Domagalska, M. A., Stelmaszewska, J., AbdElgawad, H., Zhao, X., et al. (2019). Multiple mechanisms explain how reduced KRP expression increases leaf size of Arabidopsis thaliana. NEW PHYTOLOGIST, 221(3), 1345–1358.
Vancouver
1.
Sizani BL, Kalve S, Markakis MN, Domagalska MA, Stelmaszewska J, AbdElgawad H, et al. Multiple mechanisms explain how reduced KRP expression increases leaf size of Arabidopsis thaliana. NEW PHYTOLOGIST. 2019;221(3):1345–58.
MLA
Sizani, Bulelani L et al. “Multiple Mechanisms Explain How Reduced KRP Expression Increases Leaf Size of Arabidopsis Thaliana.” NEW PHYTOLOGIST 221.3 (2019): 1345–1358. Print.
@article{8591951,
  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 endoreplication cycle. 
Double and triple mutants progressively increased mature leaf size, because of elevated expression of cell cycle and DNA replication genes stimulating progression through the division and endoreplication cycle. However, cell number was also already increased before leaf emergence, as a result of an increased cell number in the embryo. We show that increased embryo and seed size in krp4/6/7 results from seed abortion, presumably reducing resource competition, and that seed size differences contribute to the phenotype of several large-leaf mutants. 
Our results provide a new mechanistic understanding of the role of cell cycle regulation in leaf development and highlight the contribution of the embryo to the development of leaves after germination in general.},
  author       = {Sizani, Bulelani L and Kalve, Shweta and Markakis, Marios N and Domagalska, Malgorzata A and Stelmaszewska, Joanna and AbdElgawad, Hamada and Zhao, Xin'ai and De Veylder, Lieven and De Vos, Dirk and Broeckhove, Jan and Schnittger, Arp and Beemster, Gerrit TS},
  issn         = {0028-646X},
  journal      = {NEW PHYTOLOGIST},
  language     = {eng},
  number       = {3},
  pages        = {1345--1358},
  title        = {Multiple mechanisms explain how reduced KRP expression increases leaf size of Arabidopsis thaliana},
  url          = {http://dx.doi.org/10.1111/nph.15458},
  volume       = {221},
  year         = {2019},
}

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