Author(s):
Santos, Luiz Cláudio Nascimento [UNESP] ; Barreto, Rafael Ferreira [UNESP] ; Prado, Renato Mello [UNESP] ; Silva, Gilmara Pereira [UNESP] ; Santos, Janaína Maria Rodrigues ; Lasa, Berta ; Aparicio-Tejo, Pedro Maria ; Michelena, Iker Aranjuelo ; Carvalho, Rogério Falleiros [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/200851
Origin: Oasisbr
Subject(s): Ammonium toxicity; Indoleacetic acid; Low nitrogen; Nitrogen limitation adaptation; Ammonium toxicity; Ammonium toxicity; Indoleacetic acid; Indoleacetic acid; Low nitrogen; Low nitrogen; Nitrogen limitation adaptation; Nitrogen limitation adaptation
Description
Made available in DSpace on 2020-12-12T02:17:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-09-01
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.
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
Department Ciencias del Medio Natural Universidad Publica de Navarra
Instituto de Agrobiotecnologia UPNA-CSIC
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
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
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
