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HSP90 and checkpoint-dependent lengthening of the G2 phase observed in plant cells under hypoxia and cold

journal contribution
posted on 2023-06-15, 14:43 authored by M I Giménez-Abián, A E Rozalén, J A Carballo, ML Botella, J Pincheira, J F López-Sáez, C de la Torre
Proliferating cells of Allium cepa L. roots became adapted to hypoxia (5% oxygen) and cold (10°C) by acquiring new steady-state kinetics of growth. The cell cycle time increased from the 17.6 h in control meristems up to 29.7 and 69.0 h under hypoxia and cold conditions, respectively. Acclimation of the proliferating cells was stress specific. No acclimation took place after 24 h of heat treatment (40°C). Under cold treatment, all cycle phases enlarged uniformly. However, under hypoxia, while the G1 and S cycle phases roughly doubled in their timing, the expected checkpoint-dependent lengthening of G2 did not take place. This failure in lengthening G2 in response to hypoxia correlated with a failure in the overinduction of a single peptide with a molecular mass of about 134 kDa which is among those recognised by an HSP90 antibody. Moreover, the presence of this large peptide of the HSP90 family proved to be a marker for cell proliferation. It was always absent from the contiguous differentiated cells of the root. Lastly, the mitochondrial chaperonin recognized by an HSP60 antibody in these roots not involved in photosynthesis was always higher in the proliferating than in the nonproliferating cells.

History

Publication status

  • Published

File Version

  • Published version

Journal

Protoplasma

ISSN

0033-183X

Publisher

Springer

Issue

2-4

Volume

223

Page range

191-196

Department affiliated with

  • Sussex Centre for Genome Damage Stability Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2014-07-11

First Compliant Deposit (FCD) Date

2014-07-11

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