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The auxin-resistant dgt tomato mutant grows less than the wild type but is less sensitive to ammonium toxicity and nitrogen deficiency.
Santos, Luiz Cláudio Nascimento; Barreto, Rafael Ferreira; Prado, Renato Mello; Silva, Gilmara Pereira; Santos, Janaína Maria Rodrigues; Lasa, Berta; Aparicio-Tejo, Pedro Maria; Michelena, Iker Aranjuelo; Carvalho, Rogério Falleiros.
Afiliação
  • Santos LCN; Department of Soils and Fertilizers, São Paulo State University (Unesp), School of Agricultural and Veterinarian Sciences, Jaboticabal, Via de Acesso Prof. Paulo Donato Castelane, S/N, Vila Industrial, Jaboticabal, 14884-900, Brazil.
  • Barreto RF; Department of Soils and Fertilizers, São Paulo State University (Unesp), School of Agricultural and Veterinarian Sciences, Jaboticabal, Via de Acesso Prof. Paulo Donato Castelane, S/N, Vila Industrial, Jaboticabal, 14884-900, Brazil.
  • Prado RM; Department of Soils and Fertilizers, São Paulo State University (Unesp), School of Agricultural and Veterinarian Sciences, Jaboticabal, Via de Acesso Prof. Paulo Donato Castelane, S/N, Vila Industrial, Jaboticabal, 14884-900, Brazil.
  • Silva GP; Department of Soils and Fertilizers, São Paulo State University (Unesp), School of Agricultural and Veterinarian Sciences, Jaboticabal, Via de Acesso Prof. Paulo Donato Castelane, S/N, Vila Industrial, Jaboticabal, 14884-900, Brazil.
  • Santos JMR; Department Ciencias del Medio Natural, Universidad Publica de Navarra, Pamplona, Spain.
  • Lasa B; Department Ciencias del Medio Natural, Universidad Publica de Navarra, Pamplona, Spain.
  • Aparicio-Tejo PM; Department Ciencias del Medio Natural, Universidad Publica de Navarra, Pamplona, Spain.
  • Michelena IA; Instituto de Agrobiotecnologia, UPNA-CSIC, Pamplona, Spain.
  • Carvalho RF; Department of Biology Applied to Agriculture, São Paulo State University (UNESP), School of Agricultural and Veterinarian Sciences, Jaboticabal, Via de Acesso Prof. Paulo Donato Castelane, S/N, Vila Industrial, Jaboticabal, 14884-900, Brazil. Electronic address: rogerio.f.carvalho@unesp.br.
J Plant Physiol ; 252: 153243, 2020 Sep.
Article em En | MEDLINE | ID: mdl-32758793
The low-auxin-sensitivity tomato mutant, dgt, despite displaying reduced plant growth, has been linked to greater resistance to N deficiency. This led us to test the role of auxin resistance of dgt in NH4+ toxicity and N deficiency, compared to wild type tomato (cv. Micro-Tom, MT), grown in hydroponic media. A completely randomized design with three replications in a 2 × 4 factorial scheme was adopted, corresponding to the two tomato genotypes (MT and dgt), involving four nutritional treatments: NO3- (5 mM); NH4+ (5 mM); NO3- (5 mM) plus exogenous auxin (10 µM IAA); and N omission. The results show that NH4+ was toxic to MT but not to dgt. Under N deficiency, MT displayed a lower shoot NO3- content, a lower photosynthetic rate, and a decrease in both shoot and root dry weight. However, in dgt, no difference was observed in shoot NO3- content and photosynthetic rate between plants grown on NO3- or under N deficiency. In addition, dgt showed an increase in shoot dry weight under N deficiency. We highlight the role of auxin resistance in the adaptation of plants to NH4+ toxicity and N deficiency.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Reguladores de Crescimento de Plantas / Solanum lycopersicum / Compostos de Amônio / Genótipo / Ácidos Indolacéticos / Nitrogênio Tipo de estudo: Clinical_trials / Diagnostic_studies Idioma: En Revista: J Plant Physiol Assunto da revista: BOTANICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Reguladores de Crescimento de Plantas / Solanum lycopersicum / Compostos de Amônio / Genótipo / Ácidos Indolacéticos / Nitrogênio Tipo de estudo: Clinical_trials / Diagnostic_studies Idioma: En Revista: J Plant Physiol Assunto da revista: BOTANICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha