scholarly journals A Local Maximum in Gibberellin Levels Regulates Maize Leaf Growth by Spatial Control of Cell Division

2012 ◽  
Vol 22 (13) ◽  
pp. 1266 ◽  
Author(s):  
Hilde Nelissen ◽  
Bart Rymen ◽  
Yusuke Jikumaru ◽  
Kirin Demuynck ◽  
Mieke Van Lijsebettens ◽  
...  
Keyword(s):  
Cell Division ◽  
Leaf Growth ◽  
Local Maximum ◽  
Spatial Control ◽  
Maize Leaf

scholarly journals A Local Maximum in Gibberellin Levels Regulates Maize Leaf Growth by Spatial Control of Cell Division

2012 ◽  
Vol 22 (13) ◽  
pp. 1183-1187 ◽  
Author(s):  
Hilde Nelissen ◽  
Bart Rymen ◽  
Yusuke Jikumaru ◽  
Kirin Demuynck ◽  
Mieke Van Lijsebettens ◽  
...  
Keyword(s):  
Cell Division ◽  
Leaf Growth ◽  
Local Maximum ◽  
Spatial Control ◽  
Maize Leaf

scholarly journals The reduction in maize leaf growth under mild drought affects the transition between cell division and cell expansion and cannot be restored by elevated gibberellic acid levels

2017 ◽  
Vol 16 (2) ◽  
pp. 615-627 ◽  
Author(s):  
Hilde Nelissen ◽  
Xiao-Huan Sun ◽  
Bart Rymen ◽  
Yusuke Jikumaru ◽  
Mikko Kojima ◽  
...  
Keyword(s):  
Cell Division ◽  
Gibberellic Acid ◽  
Cell Expansion ◽  
Leaf Growth ◽  
Maize Leaf ◽  
Mild Drought

scholarly journals Cytokinin promotes jasmonic acid accumulation in the control of maize leaf growth

2019 ◽  
Author(s):  
Aimee N. Uyehara ◽  
Angel R. Del Valle-Echevarria ◽  
Charles T. Hunter ◽  
Hilde Nelissen ◽  
Kirin Demuynck ◽  
...  
Keyword(s):  
Growth Rate ◽  
Cell Division ◽  
Jasmonic Acid ◽  
Leaf Growth ◽  
Leaf Size ◽  
Wild Type ◽  
Cytokinin Signaling ◽  
Transcript Accumulation ◽  
Maize Leaf ◽  
Pathway Gene

AbstractGrowth of plant organs results from the combined activity of cell division and cell expansion. The coordination of these two processes depends on the interplay between multiple hormones that determine final organ size. Using the semidominant Hairy Sheath Frayed1 (Hsf1) maize mutant, that hypersignals the perception of cytokinin (CK), we show that CK can reduce leaf size and growth rate by decreasing cell division. Linked to CK hypersignaling, the Hsf1 mutant has increased jasmonic acid (JA) content, a hormone that can inhibit cell division. Treatment of wild type seedlings with exogenous JA reduces maize leaf size and growth rate, while JA deficient maize mutants have increased leaf size and growth rate. Expression analysis revealed increased transcript accumulation of several JA pathway genes in the Hsf1 leaf growth zone. A transient treatment of growing wild type maize shoots with exogenous CK also induced JA pathway gene expression, although this effect was blocked by co-treatment with cycloheximide. Together our results suggest that CK can promote JA accumulation possibly through increased expression of specific JA pathway genes.One sentence summaryCytokinin-signaling upregulates the jasmonate biosynthesis pathway, resulting in jasmonate accumulation and influences on maize leaf growth.

scholarly journals Differential Methylation during Maize Leaf Growth Targets Developmentally Regulated Genes

2014 ◽  
Vol 164 (3) ◽  
pp. 1350-1364 ◽  
Author(s):  
Jasper Candaele ◽  
Kirin Demuynck ◽  
Douglas Mosoti ◽  
Gerrit T.S. Beemster ◽  
Dirk Inzé ◽  
...  
Keyword(s):  
Leaf Growth ◽  
Differential Methylation ◽  
Developmentally Regulated ◽  
Maize Leaf

discordia mutations specifically misorient asymmetric cell divisions during development of the maize leaf epidermis

Development ◽  
1999 ◽  
Vol 126 (20) ◽  
pp. 4623-4633 ◽  
Author(s):  
K. Gallagher ◽  
L.G. Smith
Keyword(s):  
Cell Division ◽  
Preprophase Band ◽  
Cytochalasin D ◽  
Leaf Epidermis ◽  
Asymmetric Cell Divisions ◽  
Maize Leaf ◽  
Cell Divisions ◽  
Cytoskeletal Structure ◽  
Dividing Cells ◽  
Preprophase Bands

In plant cells, cytokinesis depends on a cytoskeletal structure called a phragmoplast, which directs the formation of a new cell wall between daughter nuclei after mitosis. The orientation of cell division depends on guidance of the phragmoplast during cytokinesis to a cortical site marked throughout prophase by another cytoskeletal structure called a preprophase band. Asymmetrically dividing cells become polarized and form asymmetric preprophase bands prior to mitosis; phragmoplasts are subsequently guided to these asymmetric cortical sites to form daughter cells of different shapes and/or sizes. Here we describe two new recessive mutations, discordia1 (dcd1) and discordia2 (dcd2), which disrupt the spatial regulation of cytokinesis during asymmetric cell divisions. Both mutations disrupt four classes of asymmetric cell divisions during the development of the maize leaf epidermis, without affecting the symmetric divisions through which most epidermal cells arise. The effects of dcd mutations on asymmetric cell division can be mimicked by cytochalasin D treatment, and divisions affected by dcd1 are hypersensitive to the effects of cytochalasin D. Analysis of actin and microtubule organization in these mutants showed no effect of either mutation on cell polarity, or on formation and localization of preprophase bands and spindles. In mutant cells, phragmoplasts in asymmetrically dividing cells are structurally normal and are initiated in the correct location, but often fail to move to the position formerly occupied by the preprophase band. We propose that dcd mutations disrupt an actin-dependent process necessary for the guidance of phragmoplasts during cytokinesis in asymmetrically dividing cells.

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