Putrescine differently influences the effect of salt stress on polyamine metabolism and ethylene synthesis in rice cultivars differing in salt resistance

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.

• Publication year

  2010

• Venue

  Journal of Experimental Botany

• Publication date

  2010-05-14

• Fields of study

  Biology, Medicine, Environmental Science

• Identifiers
  DOI 10.1093/jxb/erq118PMID 20472577PMCID 2882274
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• Salt-resistant Pokkali produced more ethylene than salt-sensitive I Kong Pao, and exogenous putrescine increased ethylene synthesis in both cultivars.

  Confidence 0.96

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• Salt stress increased polyamine catabolic enzymes in Pokkali roots and I Kong Pao shoots.

  Confidence 0.90

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• Putrescine biosynthesis enzymes were higher in salt-resistant Pokkali than in salt-sensitive I Kong Pao, and both contributed to the salt response.

  Confidence 0.95

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• Salt stress increased conjugated putrescine in salt-resistant Pokkali but decreased it in salt-sensitive I Kong Pao, consistent with a protective role for this pool in NaCl response.

  Confidence 0.97

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review

• conjugated putrescine

  compound pool

  The bound or conjugated fraction of putrescine measured in rice tissues.

  Aliases: conjugated polyamine pool

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• ethylene synthesis

  process

  Ethylene production measured in rice tissues under salt and putrescine treatments.

  Aliases: ethylene production, ethylene biosynthesis

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• polyamine catabolic enzymes

  enzyme group

  The DAO and PAO activities associated with polyamine oxidation in rice tissues.

  Aliases: DAO, PAO, diamine oxidase, polyamine oxidase

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• putrescine

  compound

  A polyamine supplied exogenously at 1 mM and also measured as an endogenous metabolite in plant tissues.

  Aliases: PUT

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• putrescine biosynthesis enzymes

  enzyme group

  The ODC and ADC activities that generate putrescine from precursor amino acids.

  Aliases: ODC, ADC, ornithine decarboxylase, arginine decarboxylase

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• salt-resistant pokkali

  cultivar

  The rice cultivar used as the salt-tolerant comparison genotype in the experiment.

  Aliases: Pokkali, salt-resistant cultivar

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• salt-sensitive i kong pao

  cultivar

  The rice cultivar used as the salt-sensitive comparison genotype in the experiment.

  Aliases: I Kong Pao, IKP, salt-sensitive cultivar

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review
• salt stress

  condition

  NaCl treatment applied to rice plants in nutrient solution to test stress responses.

  Aliases: NaCl stress, salt treatment

  mexicorea (qjvnbu8xg3) extractionAnonymous (12632b8b5f) review뀨 (7c402c1b98) reviewAll you need is Python (5d7gwfm5zu) review

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