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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F14%3A10281960%21RIV15-MSM-11310___
rdf:type
n19:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1007/s11738-014-1573-1
dcterms:description
We describe complex multiple concentration dependencies for the response of isolated pith tissues to plant biologically active substances. Kale and tobacco stem pith explants were cultured on agar media containing combinations of sucrose, cytokinin [kinetin or benzyladenine (BA)] and auxin [indole-3-acetic acid (IAA) or naphthaleneacetic acid (NAA)]. Absorption of these components by explants and their effects on explant mass, contents of soluble proteins, starch and sugars, and activity of ADP-glucose pyrophosphorylase (AGPase) were studied in relation to their concentration. Up to ten pronounced statistically significant maxima (peaks or waves) were repeatedly detected in the dose-response curves over a concentration range of several logarithmic orders. Slight maxima were observed in the corresponding absorption curves. Pronounced maxima of sucrose absorption were induced by IAA and BA, and those of NAA absorption were induced by sucrose. Both types of multiple maxima (in dose-response and absorption curves) may be due to changes in concentration of intracellular solutes (sugars, auxins and cytokinins), thereby affecting metabolic processes that act as sinks for external solutes and elicit feedback appearance of maxima in absorption curves. Good correspondence between external concentrations at which maxima of different compared curves occur in addition to statistical significance of individual maxima and repeatability of experimental results supports the conclusion that the multiple maxima exhibited are genuine. We consider it possibile that the multiple maxima are associated with endopolyploidy or mixoploidy and/or epigenomic diversity of pith cells that show different sensitivities to biologically active solutes. We describe complex multiple concentration dependencies for the response of isolated pith tissues to plant biologically active substances. Kale and tobacco stem pith explants were cultured on agar media containing combinations of sucrose, cytokinin [kinetin or benzyladenine (BA)] and auxin [indole-3-acetic acid (IAA) or naphthaleneacetic acid (NAA)]. Absorption of these components by explants and their effects on explant mass, contents of soluble proteins, starch and sugars, and activity of ADP-glucose pyrophosphorylase (AGPase) were studied in relation to their concentration. Up to ten pronounced statistically significant maxima (peaks or waves) were repeatedly detected in the dose-response curves over a concentration range of several logarithmic orders. Slight maxima were observed in the corresponding absorption curves. Pronounced maxima of sucrose absorption were induced by IAA and BA, and those of NAA absorption were induced by sucrose. Both types of multiple maxima (in dose-response and absorption curves) may be due to changes in concentration of intracellular solutes (sugars, auxins and cytokinins), thereby affecting metabolic processes that act as sinks for external solutes and elicit feedback appearance of maxima in absorption curves. Good correspondence between external concentrations at which maxima of different compared curves occur in addition to statistical significance of individual maxima and repeatability of experimental results supports the conclusion that the multiple maxima exhibited are genuine. We consider it possibile that the multiple maxima are associated with endopolyploidy or mixoploidy and/or epigenomic diversity of pith cells that show different sensitivities to biologically active solutes.
dcterms:title
Multiple, concentration-dependent effects of sucrose, auxins and cytokinins in explant cultures of kale and tobacco Multiple, concentration-dependent effects of sucrose, auxins and cytokinins in explant cultures of kale and tobacco
skos:prefLabel
Multiple, concentration-dependent effects of sucrose, auxins and cytokinins in explant cultures of kale and tobacco Multiple, concentration-dependent effects of sucrose, auxins and cytokinins in explant cultures of kale and tobacco
skos:notation
RIV/00216208:11310/14:10281960!RIV15-MSM-11310___
n3:aktivita
n4:I n4:P
n3:aktivity
I, P(LO1204)
n3:cisloPeriodika
8
n3:dodaniDat
n14:2015
n3:domaciTvurceVysledku
n17:6879802 n17:9081186
n3:druhVysledku
n7:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
31081
n3:idVysledku
RIV/00216208:11310/14:10281960
n3:jazykVysledku
n10:eng
n3:klicovaSlova
Sugars; Starch accumulation; Soluble proteins; Mixoploidy; Epigenomic diversity; Endopolyploidy; AGPase; Absorption; Nicotiana tabacum; Brassica oleracea
n3:klicoveSlovo
n5:Starch%20accumulation n5:Epigenomic%20diversity n5:Sugars n5:Nicotiana%20tabacum n5:AGPase n5:Brassica%20oleracea n5:Soluble%20proteins n5:Mixoploidy n5:Endopolyploidy n5:Absorption
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[9A81BDE82026]
n3:nazevZdroje
Acta Physiologiae Plantarum
n3:obor
n9:ED
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
6
n3:projekt
n13:LO1204
n3:rokUplatneniVysledku
n14:2014
n3:svazekPeriodika
36
n3:tvurceVysledku
Žárský, Viktor Cizkova, Jana Kaminek, Miroslav Dolezel, Jaroslav Cvrčková, Fatima Lustinec, Jiří
n3:wos
000339817600003
s:issn
0137-5881
s:numberOfPages
11
n6:doi
10.1007/s11738-014-1573-1
n8:organizacniJednotka
11310