scholarly journals A Model of Differential Growth-Guided Apical Hook Formation in Plants

2016 ◽  
Vol 28 (10) ◽  
pp. 2464-2477 ◽  
Author(s):  
Petra Žádníková ◽  
Krzysztof Wabnik ◽  
Anas Abuzeineh ◽  
Marçal Gallemi ◽  
Dominique Van Der Straeten ◽  
...  
Keyword(s):  
Differential Growth ◽  
Apical Hook

TMK1-mediated auxin signalling regulates differential growth of the apical hook

Nature ◽  
2019 ◽  
Vol 568 (7751) ◽  
pp. 240-243 ◽  
Author(s):  
Min Cao ◽  
Rong Chen ◽  
Pan Li ◽  
Yongqiang Yu ◽  
Rui Zheng ◽  
...  
Keyword(s):  
Differential Growth ◽  
Apical Hook ◽  
Auxin Signalling

scholarly journals FRUITFULL Is a Repressor of Apical Hook Opening in Arabidopsis thaliana

2020 ◽  
Vol 21 (17) ◽  
pp. 6438
Author(s):  
Miriam Führer ◽  
Angelika Gaidora ◽  
Peter Venhuizen ◽  
Jedrzej Dobrogojski ◽  
Chloé Béziat ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
In Silico ◽  
Target Genes ◽  
Growth Promotion ◽  
In Silico Analysis ◽  
Regulatory Elements ◽  
Suitable Model ◽  
Differential Growth ◽  
Apical Hook ◽  
Growth Transitions

Plants adjust their architecture to a constantly changing environment, requiring adaptation of differential growth. Despite their importance, molecular switches, which define growth transitions, are largely unknown. Apical hook development in dark grown Arabidopsis thaliana (A. thaliana) seedlings serves as a suitable model for differential growth transition in plants. Here, we show that the phytohormone auxin counteracts the light-induced growth transition during apical hook opening. We, subsequently, identified genes which are inversely regulated by light and auxin. We used in silico analysis of the regulatory elements in this set of genes and subsequently used natural variation in gene expression to uncover correlations between underlying transcription factors and the in silico predicted target genes. This approach uncovered that MADS box transcription factor AGAMOUS-LIKE 8 (AGL8)/FRUITFULL (FUL) modulates apical hook opening. Our data shows that transient FUL expression represses the expression of growth stimulating genes during early phases of apical hook development and therewith guards the transition to growth promotion for apical hook opening. Here, we propose a role for FUL in setting tissue identity, thereby regulating differential growth during apical hook development.

scholarly journals Differential growth at the apical hook: all roads lead to auxin

2013 ◽  
Vol 4 ◽  
Author(s):  
Mohamad Abbas ◽  
David Alabadí ◽  
Miguel A. Blázquez
Keyword(s):  
Differential Growth ◽  
Apical Hook

Regulation of differential growth in the apical hook of Arabidopsis

Development ◽  
1999 ◽  
Vol 126 (16) ◽  
pp. 3661-3668 ◽  
Author(s):  
V. Raz ◽  
J.R. Ecker
Keyword(s):  
Apical Part ◽  
Time Dependent ◽  
Outer Side ◽  
Acid Oxidase ◽  
Differential Growth ◽  
Oxidase Gene ◽  
Apical Hook ◽  
Distinct Process ◽  
Differential Cell ◽  
Sequential Phase

Arabidopsis seedlings develop a hook-like structure at the apical part of the hypocotyl when grown in darkness. Differential cell growth processes result in the curved hypocotyl hook. Time-dependent analyses of the hypocotyl showed that the apical hook is formed during an early phase of seedling growth and is maintained in a sequential phase by a distinct process. Based on developmental genetic analyses of hook-affected mutants, we show that the hookless mutants (hls1, cop2) are involved in an early aspect of hook development. From time-dependent analyses of ethylene-insensitive mutants, later steps in hook maintenance were found to be ethylene sensitive. Regulation of differential growth was further studied through examination of the spatial pattern of expression of two hormone-regulated genes: an ethylene biosynthetic enzyme and the ethylene receptor ETR1. Accumulation of mRNA for AtACO2, a novel ACC (1-aminocyclopropane-1-carboxylic acid) oxidase gene, occurred within cells predominantly located on the outer-side of the hook and was tightly correlated with ethylene-induced exaggeration in the curvature of the hook. ETR1 expression in the apical hook, however, was reduced by ethylene treatment. Based on the expression pattern of ETR1 and AtACO2 in the hook-affected mutants, a model for hook development and maintenance is proposed.

scholarly journals Root gravity response module guides differential growth determining both root bending and apical hook formation in Arabidopsis

Development ◽  
2019 ◽  
Vol 146 (17) ◽  
pp. dev175919 ◽  
Author(s):  
Qiang Zhu ◽  
Marçal Gallemí ◽  
Jiří Pospíšil ◽  
Petra Žádníková ◽  
Miroslav Strnad ◽  
...  
Keyword(s):  
Differential Growth ◽  
Apical Hook ◽  
Gravity Response

Differential growth effect of regenerating (reg) protein on a rat ß-cell line

2001 ◽  
Vol 120 (5) ◽  
pp. A338-A339
Author(s):  
Z FAN ◽  
H WU ◽  
S PATEL ◽  
M ZENILMAN
Keyword(s):  
Cell Line ◽  
Growth Effect ◽  
Differential Growth
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