Quantitative dissection of variations in root growth rate : a matter of cell proliferation or of cell expansion?

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2018
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Youssef, Chvan
Bizet, François
Bastien, Renaud
Legland, David
Bogeat-Triboulot, Marie-Béatrice
Hummel, Irène
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Journal of Experimental Botany. 2018, 69(21), pp. 5157-5168. ISSN 0022-0957. eISSN 1460-2431. Available under: doi: 10.1093/jxb/ery272
Zusammenfassung

Plant organ growth results from cell production and cell expansion. Deciphering the contribution of each of these processes to growth rate is an important issue in developmental biology. Here, we investigated the cellular processes governing root elongation rate, considering two sources of variation: genotype and disturbance by chemicals (NaCl, polyethylene glycol, H2O2, abscisic acid). Exploiting the adventitious rooting capacity of the Populus genus, and using time-lapse imaging under infrared-light, particle image velocimetry, histological analysis, and kinematics, we quantified the cellular processes involved in root growth variation, and analysed the covariation patterns between growth parameters. The rate of cell production by the root apical meristem and the number of dividing cells were estimated in vivo without destructive measurement. We found that the rate of cell division contributed more to the variation in cell production rate than the number of dividing cells. Regardless of the source of variation, the length of the elongation zone was the best proxy for growth rate, summarizing rates of cell production and cell elongation into a single parameter. Our results demonstrate that cell production rate is the main driver of growth rate, whereas elemental elongation rate is a key driver of short-term growth adjustments.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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Cell expansion, cell division, kinematics, elemental elongation rate, Populus, root apical meristem, root growth rate
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ISO 690YOUSSEF, Chvan, François BIZET, Renaud BASTIEN, David LEGLAND, Marie-Béatrice BOGEAT-TRIBOULOT, Irène HUMMEL, 2018. Quantitative dissection of variations in root growth rate : a matter of cell proliferation or of cell expansion?. In: Journal of Experimental Botany. 2018, 69(21), pp. 5157-5168. ISSN 0022-0957. eISSN 1460-2431. Available under: doi: 10.1093/jxb/ery272
BibTex
@article{Youssef2018-10-12Quant-44911,
  year={2018},
  doi={10.1093/jxb/ery272},
  title={Quantitative dissection of variations in root growth rate : a matter of cell proliferation or of cell expansion?},
  number={21},
  volume={69},
  issn={0022-0957},
  journal={Journal of Experimental Botany},
  pages={5157--5168},
  author={Youssef, Chvan and Bizet, François and Bastien, Renaud and Legland, David and Bogeat-Triboulot, Marie-Béatrice and Hummel, Irène}
}
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