The auxin-resistant dgt tomato mutant grows less than the wild type but is less sensitive to ammonium toxicity and nitrogen deficiency.
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
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Solanum lycopersicum
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Compostos de Amônio
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Genótipo
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Ácidos Indolacéticos
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Nitrogênio
Tipo de estudo:
Clinical_trials
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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