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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F11%3A33118622%21RIV12-MSM-15310___
rdf:type
n13:Vysledek skos:Concept
dcterms:description
Mixed nitrate/ammonium fertilization can partially alleviate the negative effects of salinity on growth of some plant species compared to all-nitrate or all-ammonium fertilization. To gain insights about the mechanisms involved, tomato (Solanum lycopersicum L. cv Moneymaker) plants were grown hydroponically for 3 weeks with two NO3-/NH4+ fertilization regimes (6/0.5 and 5/1.5; Ntotal = 6.5 mM) in the absence (control) or presence of salt stress (100 mM NaCl). Ammonium enrichment had no effect on growth and other parameters under control conditions. Under salinity, however, ammonium enrichment improved shoot and root biomass by 20% and maintained leaf PSII efficiency close to control levels. These changes were related to higher leaf K+, NO3-, and NH4+ concentrations and activities of the N-assimilatory enzymes glutamate synthase (GOGAT) and glutamine synthase (GS) in the leaves. Ammonium enrichment also attenuated the salt-induced increase in leaf abscisic acid (ABA) concentration and decrease in leaf concentrations of indole 3-acetic acid (IAA) and the cytokinins trans-zeatin (tZ) and trans-zeatin riboside (tZR). Enhanced cytokinin status was probably due to maintenance of root-to-shoot cytokinin transport and decreased leaf induction of the cytokinindegrading enzyme cytokinin oxidase/dehydrogenase (CKX) under ammonium-enriched conditions. It is concluded that nitrogen form modifies salinity-induced physiological responses and that these modifications are associated with changes in plant hormone status. Mixed nitrate/ammonium fertilization can partially alleviate the negative effects of salinity on growth of some plant species compared to all-nitrate or all-ammonium fertilization. To gain insights about the mechanisms involved, tomato (Solanum lycopersicum L. cv Moneymaker) plants were grown hydroponically for 3 weeks with two NO3-/NH4+ fertilization regimes (6/0.5 and 5/1.5; Ntotal = 6.5 mM) in the absence (control) or presence of salt stress (100 mM NaCl). Ammonium enrichment had no effect on growth and other parameters under control conditions. Under salinity, however, ammonium enrichment improved shoot and root biomass by 20% and maintained leaf PSII efficiency close to control levels. These changes were related to higher leaf K+, NO3-, and NH4+ concentrations and activities of the N-assimilatory enzymes glutamate synthase (GOGAT) and glutamine synthase (GS) in the leaves. Ammonium enrichment also attenuated the salt-induced increase in leaf abscisic acid (ABA) concentration and decrease in leaf concentrations of indole 3-acetic acid (IAA) and the cytokinins trans-zeatin (tZ) and trans-zeatin riboside (tZR). Enhanced cytokinin status was probably due to maintenance of root-to-shoot cytokinin transport and decreased leaf induction of the cytokinindegrading enzyme cytokinin oxidase/dehydrogenase (CKX) under ammonium-enriched conditions. It is concluded that nitrogen form modifies salinity-induced physiological responses and that these modifications are associated with changes in plant hormone status.
dcterms:title
Nitrogen form alters hormonal balance in salt-treated tomato (Solanum lycopersicum L.). Nitrogen form alters hormonal balance in salt-treated tomato (Solanum lycopersicum L.).
skos:prefLabel
Nitrogen form alters hormonal balance in salt-treated tomato (Solanum lycopersicum L.). Nitrogen form alters hormonal balance in salt-treated tomato (Solanum lycopersicum L.).
skos:notation
RIV/61989592:15310/11:33118622!RIV12-MSM-15310___
n13:predkladatel
n20:orjk%3A15310
n4:aktivita
n12:Z
n4:aktivity
Z(MSM6198959216)
n4:cisloPeriodika
1
n4:dodaniDat
n10:2012
n4:domaciTvurceVysledku
n19:9869662
n4:druhVysledku
n5:J
n4:duvernostUdaju
n9:S
n4:entitaPredkladatele
n18:predkladatel
n4:idSjednocenehoVysledku
216069
n4:idVysledku
RIV/61989592:15310/11:33118622
n4:jazykVysledku
n16:eng
n4:klicovaSlova
trans-Zeatin riboside; trans-Zeatin; Tomato (Solanum lycopersicum L.); Sodium chloride; Salt stress; Plant hormones; Nitrogen metabolism; Nitrate; Indole-3-acetic acid; Cytokinin; Amonium; Abscisic acid
n4:klicoveSlovo
n8:Amonium n8:Indole-3-acetic%20acid n8:trans-Zeatin%20riboside n8:trans-Zeatin n8:Nitrate n8:Abscisic%20acid n8:Cytokinin n8:Tomato%20%28Solanum%20lycopersicum%20L.%29 n8:Nitrogen%20metabolism n8:Sodium%20chloride n8:Salt%20stress n8:Plant%20hormones
n4:kodStatuVydavatele
DE - Spolková republika Německo
n4:kontrolniKodProRIV
[411FAC23FFCD]
n4:nazevZdroje
Journal of Plant Growth Regulation
n4:obor
n17:EF
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
7
n4:rokUplatneniVysledku
n10:2011
n4:svazekPeriodika
30
n4:tvurceVysledku
Dodd, Ian Ghanem, Michel Edmont Pérez-Alfocea, Franscisco Albacete, Alfonso Lutts, Stanley Pospíšilová, Hana Martínez-Andújar, Cristina
n4:wos
000291042600003
n4:zamer
n6:MSM6198959216
s:issn
0721-7595
s:numberOfPages
14
n3:doi
10.1007/s00344-010-9178-4
n15:organizacniJednotka
15310