Cell division and regeneration in primary root meristems of Zea mays recovering from cold treatment

1985 ◽  
Vol 25 (4) ◽  
pp. 303-314 ◽  
Author(s):  
Peter W. Barlow ◽  
Erica L. Rathfelder
Keyword(s):  
Zea Mays ◽  
Cell Division ◽  
Cold Treatment ◽  
Primary Root ◽  
Root Meristems

scholarly journals Radioisotopic studies of DNA biosynthesis in relation to growth of Zea mays roots

2014 ◽  
Vol 55 (1) ◽  
pp. 97-106
Author(s):  
Roman Maksymowych ◽  
Andrew B. Maksymowych ◽  
Joseph A. Orkwiszewski
Keyword(s):  
Zea Mays ◽  
Cell Division ◽  
Dna Synthesis ◽  
Cell Elongation ◽  
Liquid Scintillation ◽  
Primary Root ◽  
Root Region ◽  
Dna Biosynthesis ◽  
Primary Roots ◽  
Meristematic Region

Root growth consists of two basic processes, cell division and cell elongation. An integral part of the first process is the synthesis of deoxyribonucleic acid (DNA). DNA biosynthesis was studied in primary roots of <em>Zea mays</em> through incorporation of <sup>3</sup>H-thymidine by autoradiography and liquid scintillation spectrometry. DNA synthesis was restricted to the meristematic region of the primary root. The curve representing this process was bell-shaped with a peak at 1.5 mm from the tip. Up to 3 mm distance from the tip, the root was growing both by cell division and cell elongation. This was also the region of DNA synthesis. The root region between 3 to 9 mm from the tip. was growing only by cell elongation. The relative elemental rate of elongation had a maximum at 3.5 mm from the tip, or shortly after cessation of DNA synthesis and cell division. Cells stopped elongating at 9 mm distance from the tip.

Coordination of cell growth and cell division in maize (Zea mays L.) relevance of the conserved TOR signal transduction pathway

2010 ◽  
Vol 46 (6) ◽  
pp. 578-586 ◽  
Author(s):  
Ricardo Sotelo ◽  
Verónica Garrocho-Villegas ◽  
Raúl Aguilar ◽  
Ma. Elena Calderón ◽  
Estela Sánchez de Jiménez
Keyword(s):  
Signal Transduction ◽  
Zea Mays ◽  
Cell Division ◽  
Cell Growth ◽  
Zea Mays L ◽  
Signal Transduction Pathway ◽  
Transduction Pathway

scholarly journals Uronide Deposition Rates in the Primary Root of Zea mays

1984 ◽  
Vol 74 (3) ◽  
pp. 721-726 ◽  
Author(s):  
Wendy Kuhn Silk ◽  
Robert C. Walker ◽  
John Labavitch
Keyword(s):  
Zea Mays ◽  
Primary Root ◽  
Deposition Rates

Method for Bioassaying Chlorsulfuron in Soil and Water

Weed Science ◽  
1985 ◽  
Vol 33 (3) ◽  
pp. 420-425 ◽  
Author(s):  
Don W. Morishita ◽  
Donald C. Thill ◽  
Duane G. Flom ◽  
Tanaquil C. Campbell ◽  
Gary A. Lee
Keyword(s):  
Zea Mays ◽  
Root Length ◽  
Linear Response ◽  
Primary Root ◽  
Recovery Efficiency ◽  
Soil Extraction ◽  
Bioassay Technique ◽  
Primary Root Length ◽  
Soil And Water

Bioassay techniques were evaluated for the determination of chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino] carbonyl] benzenesulfonamide} residues in soil and water. A linear response of corn (Zea maysL.) primary root length to chlorsulfuron concentrations (InX+1) of 0.0 to 16.0 μg/L was observed in the water bioassay. Several soil extraction bioassay methods were attempted and found to be highly variable. A Ca(OH)2soil extraction bioassay technique produced a linear response of primary corn root length to chlorsulfuron concentrations ranging from 0.0 to 64.0 μg/kg. The efficiency of the Ca(OH)2extraction bioassay was determined by the use of14C-chlorsulfuron. Recovery efficiency at 1.0 μg/kg was 74% and averaged 62% at all higher chlorsulfuron concentrations.

scholarly journals Using 3D X-ray Microscopy to Study Crown Root Development and Primary Root Tip Growth in Diverse Maize (Zea mays L.) Lines

2019 ◽  
Vol 25 (S2) ◽  
pp. 1032-1033 ◽  
Author(s):  
Keith E. Duncan ◽  
Adam L. Bray ◽  
Tyler G. Dowd ◽  
Christopher N. Topp
Keyword(s):  
Zea Mays ◽  
Root Development ◽  
Tip Growth ◽  
Zea Mays L ◽  
Primary Root ◽  
Root Tip ◽  
X Ray ◽  
Crown Root

scholarly journals Nitrate Induction of Primary Root Growth Requires Cytokinin Signaling in Arabidopsis thaliana

2019 ◽  
Vol 61 (2) ◽  
pp. 342-352 ◽  
Author(s):  
Pamela A Naulin ◽  
Grace I Armijo ◽  
Andrea S Vega ◽  
Karem P Tamayo ◽  
Diana E Gras ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Cell Division ◽  
Root Growth ◽  
Primary Root ◽  
Growth Arrest ◽  
Root Tip ◽  
Wild Type ◽  
Cytokinin Signaling ◽  
Control Growth ◽  
Primary Root Growth

Abstract Nitrate can act as a potent signal to control growth and development in plants. In this study, we show that nitrate is able to stimulate primary root growth via increased meristem activity and cytokinin signaling. Cytokinin perception and biosynthesis mutants displayed shorter roots as compared with wild-type plants when grown with nitrate as the only nitrogen source. Histological analysis of the root tip revealed decreased cell division and elongation in the cytokinin receptor double mutant ahk2/ahk4 as compared with wild-type plants under a sufficient nitrate regime. Interestingly, a nitrate-dependent root growth arrest was observed between days 5 and 6 after sowing. Wild-type plants were able to recover from this growth arrest, while cytokinin signaling or biosynthesis mutants were not. Transcriptome analysis revealed significant changes in gene expression after, but not before, this transition in contrasting genotypes and nitrate regimes. We identified genes involved in both cell division and elongation as potentially important for primary root growth in response to nitrate. Our results provide evidence linking nitrate and cytokinin signaling for the control of primary root growth in Arabidopsis thaliana.

Effect of organic pollutant treatment on the growth of pea and maize seedlings

2012 ◽  
Vol 7 (1) ◽  
pp. 159-166 ◽  
Author(s):  
Marie Kummerová ◽  
Štěpán Zezulka ◽  
Lucie Váňová ◽  
Helena Fišerová
Keyword(s):  
Zea Mays ◽  
Seed Germination ◽  
Lateral Roots ◽  
Organic Pollutant ◽  
Primary Root ◽  
Dry Weight ◽  
Considerable Effect ◽  
Maize Seedlings ◽  
Polycyclic Aromatic ◽  
Primary And Lateral Roots

AbstractThis study confirmed the considerable effect of polycyclic aromatic hydrocarbon fluoranthene (FLT; 0.01, 0.1, 1, 4 and 7 mg/l) exposure on the germination of seeds, growth and root morphology of seedlings in Zea mays and Pisum sativum. Seed germination was significantly inhibited at FLT≥0.01 mg/l in maize and at ≥1 mg/l in pea. The amount of released ethylene after 3 days of germination was significantly increased in both species at FLT≥0.1 mg/l. After 7 days of seedling cultivation a significant decrease in the dry weight of roots and shoots occurred in maize at FLT≥0.1 mg/l while in pea similar effect was observed at ≥1 mg/l. The total length of primary and lateral roots was significantly reduced by FLT≥1 mg/l in maize and by 4 and 7 mg/l in pea. The length of the non-branched part of the primary root was significantly reduced by FLT≥0.1 mg/l in maize and ≥0.01 mg/l in pea. In both species the number of lateral roots was significantly increased at FLT≤1 mg/l and inhibited at concentrations of 4 and 7 mg/l. Fluoranthene content in roots and shoots of both species positively correlated with the FLT treatment.

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