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. 2012 Dec;7(12):1537-40.
doi: 10.4161/psb.22326. Epub 2012 Oct 16.

Is HUB1 a hub for plant fitness?

Kristiina Himanen  1 , Tommaso Matteo Boccardi, Riet De Rycke, Ojola Patrick Odeny, Mieke Van Lijsebettens
Affiliations

Is HUB1 a hub for plant fitness?

Kristiina Himanen et al. Plant Signal Behav. 2012 Dec.

Abstract

Recently, we have identified circadian clock genes as targets of Histone Monoubiquitination1 (HUB1) in Arabidopsis from a transcriptome comparison between the hub1-1 mutant and HUB1 overexpression lines. HUB1 affected the amplitudes of the circadian clock gene expression profiles in the hub1-1 mutant that coincided with reduced monoubiquitination of histone H2B at their coding regions. Here we showed that parameters for plant fitness are altered in HUB1 mutant and overexpression lines, suggesting that the histone H2B monoubiquitination status affects plant fitness.

Keywords: Arabidopsis thaliana; H2B monoubiquitination; chloroplast development; germination; seed parameters; yield.

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Figures

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Figure 1. Fitness parameters in HUB1 perturbed lines. (A) % of germinated seeds 1, 2 or 3 d after vernalization (DAV). (B) Leaf 1 and 2 expansion rate in Ler and OE-HUB1–7a line during 9 to 15 d after sowing. (C) Cell area increase in Ler and OE-HUB1–7a line between 9 to 25 d after sowing. (D) Chloroplast ultrastructure in Ler grown under short-day conditions, (E) hub1–1 individual with weak phenotype and (F) hub1–1 individual with severe phenotype. gr, grana; p, plastoglobuli; t, thylakoid membrane. Bar = 2 µm (D, E and F).
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Figure 2. Mean silique parameters and seed yield ± SD of the Ler, hub1–1 and OE-HUB1–7a and OE-HUB117 × lines with resp. 20- and 10-fold overexpression levels. (A) Number of siliques per plant. (B) Silique areas. (C) Siliques of Ler, hub1–1 and OE-HUB1. (D) Fertilized vs. unfertilized ovules in siliques. (E) Seed yield. (F) Seed areas.
See this image and copyright information in PMC

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