Abstract：
:Seeds of Arabidopsis thaliana were sent to space and germinated in orbit. Seedlings grew for 4d and were then fixed in-flight with paraformaldehyde. The experiment was replicated on the ground in a Random Positioning Machine, an effective simulator of microgravity. In addition, samples from a different space experiment, processed in a similar way but fixed in glutaraldehyde, including a control flight experiment in a 1g centrifuge, were also used. In all cases, comparisons were performed with ground controls at 1g. Seedlings grown in microgravity were significantly longer than the ground 1g controls. The cortical root meristematic cells were analyzed to investigate the alterations in cell proliferation and cell growth. Proliferation rate was quantified by counting the number of cells per millimeter in the specific cell files, and was found to be higher in microgravity-grown samples than in the control 1g. Cell growth was appraised through the rate of ribosome biogenesis, assessed by morphological and morphometrical parameters of the nucleolus and by the levels of the nucleolar protein nucleolin. All these parameters showed a depletion of the rate of ribosome production in microgravity-grown samples versus samples grown at 1g. The results show that growth in microgravity induces alterations in essential cellular functions. Cell growth and proliferation, which are strictly associated functions under normal ground conditions, appeared divergent after gravity modification; proliferation was enhanced, whereas growth was depleted. We suggest that the cause of these changes could be an alteration in the cell cycle regulation, at the levels of checkpoints regulating cell cycle progression, leading to a shortened G2 period.
journal_name
J Plant Physioljournal_title
Journal of plant physiologyauthors
Matía I,González-Camacho F,Herranz R,Kiss JZ,Gasset G,van Loon JJ,Marco R,Javier Medina Fdoi
10.1016/j.jplph.2009.08.012subject
Has Abstractpub_date
2010-02-15 00:00:00pages
184-93issue
3eissn
0176-1617issn
1618-1328pii
S0176-1617(09)00381-2journal_volume
167pub_type
杂志文章abstract：:Drought is one of the abiotic stresses which affects the growth and development of plants, including cotton. The role of stomatal anion channel SLAC1 has been well established in regulating stomatal closure in response to drought stress in several plant species. However, the gene encoding for the main S-type anion cha...
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journal_title：Journal of plant physiology
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journal_title：Journal of plant physiology
pub_type： 杂志文章
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pub_type： 杂志文章
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journal_title：Journal of plant physiology
pub_type： 杂志文章
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更新日期：1985-03-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2008.11.005
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2004.05.015
更新日期：2005-02-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2012.04.006
更新日期：2012-08-15 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2016.01.014
更新日期：2016-04-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
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更新日期：2020-05-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2007.06.007
更新日期：2007-12-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2014.12.003
更新日期：2015-03-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1078/0176-1617-00794
更新日期：2003-02-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2007.10.012
更新日期：2008-09-08 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2015.07.011
更新日期：2015-08-15 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2008.08.007
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journal_title：Journal of plant physiology
pub_type： 杂志文章
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journal_title：Journal of plant physiology
pub_type： 杂志文章
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更新日期：2011-07-15 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2017.03.006
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2016.05.021
更新日期：2016-08-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
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更新日期：2019-09-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2016.10.015
更新日期：2017-02-01 00:00:00
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journal_title：Journal of plant physiology
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更新日期：2018-07-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2006.04.012
更新日期：2007-05-01 00:00:00
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journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2015.07.012
更新日期：2015-08-15 00:00:00
abstract：:1-Deoxy-d-xylulose 5-phosphate reductoisomerase (DXR, EC: 1.1.1.267) is the second enzyme in the 2C-methyl-d-erythritol 4-phosphate (MEP) pathway, one of the two pathways in plants that can produce isoprenoids. The MEP pathway is the source of isoprene emitted from leaves, but rubber production is believed to result p...
journal_title：Journal of plant physiology
pub_type： 杂志文章
doi：10.1016/j.jplph.2007.06.014
更新日期：2008-06-16 00:00:00
