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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Putrescine differently influences the effect of salt stress on polyamine metabolism and ethylene synthesis in rice cultivars differing in salt resistance
Journal of Experimental Botany, Volume 61, No. 10, Year 2010
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Description
Effects of salt stress on polyamine metabolism and ethylene production were examined in two rice (Oryza sativa L.) cultivars [I Kong Pao (IKP), salt sensitive; and Pokkali, salt resistant] grown for 5 d and 12 d in nutrient solution in the presence or absence of putrescine (1 mM) and 0, 50, and 100 mM NaCl. The salt-sensitive (IKP) and salt-resistant (Pokkali) cultivars differ not only in their mean levels of putrescine, but also in the physiological functions assumed by this molecule in stressed tissues. Salt stress increased the proportion of conjugated putrescine in salt-resistant Pokkali and decreased it in the salt-sensitive IKP, suggesting a possible protective function in response to NaCl. Activities of the enzymes ornithine decarboxylase (ODC; EC 4.1.1.17) and arginine decarboxylase (ADC; EC 4.1.1.19) involved in putrescine synthesis were higher in salt-resistant Pokkali than in salt-sensitive IKP. Both enzymes were involved in the response to salt stress. Salt stress also increased diamine oxidase (DAO; 1.4.3.6) and polyamine oxidase (PAO EC 1.5.3.11) activities in the roots of salt-resistant Pokkali and in the shoots of salt-sensitive IKP. Gene expression followed by reverse transcription-PCR suggested that putrescine could have a post-translational impact on genes coding for ADC (ADCa) and ODC (ODCa and ODCb) but could induce a transcriptional activation of genes coding for PAO (PAOb) mainly in the shoot of salt-stressed plants. The salt-resistant cultivar Pokkali produced higher amounts of ethylene than the salt-sensitive cultivar IKP, and exogenous putrescine increased ethylene synthesis in both cultivars, suggesting no direct antagonism between polyamine and ethylene pathways in rice. © 2010 The Author(s).
Authors & Co-Authors
Quinet, Muriel
Belgium, Louvain-la-neuve
Université Catholique de Louvain
Ndayiragije, Alexis
Belgium, Louvain-la-neuve
Université Catholique de Louvain
Mozambique, Maputo
International Rice Research Institute (irri)
Lefèvre, Isabelle
Belgium, Louvain-la-neuve
Université Catholique de Louvain
Luxembourg, Esch-sur-alzette
Luxembourg Institute of Science and Technology
Lambillotte, Béatrice
Belgium, Louvain-la-neuve
Université Catholique de Louvain
Dupont-Gillain, Christine C.
Belgium, Louvain-la-neuve
Université Catholique de Louvain
Lutts, Stanley
Belgium, Louvain-la-neuve
Université Catholique de Louvain
Statistics
Citations: 169
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1093/jxb/erq118
ISSN:
00220957
e-ISSN:
14602431
Research Areas
Genetics And Genomics