Tomato root development and N assimilation depend on C and ABA content under different N sources
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Otros documentos de la autoría: González-Hernández, Ana I.; Scalschi, Loredana; García Agustín, Pilar; Camañes, Gemma
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https://doi.org/10.1016/j.plaphy.2020.01.031 |
Metadatos
Título
Tomato root development and N assimilation depend on C and ABA content under different N sourcesFecha de publicación
2020Editor
ElsevierISSN
0981-9428; 1873-2690Cita bibliográfica
GONZÁLEZ-HERNÁNDEZ, Ana Isabel, et al. Tomato root development and N assimilation depend on C and ABA content under different N sources. Plant Physiology and Biochemistry, 2020, vol. 148, p. 368-378.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://www.sciencedirect.com/science/article/pii/S0981942820300395Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Root plasticity is controlled by hormonal homeostasis and nutrient availability. In this work, we have determined the influence of different N regimens on growth parameters and on the expression of genes involved in ... [+]
Root plasticity is controlled by hormonal homeostasis and nutrient availability. In this work, we have determined the influence of different N regimens on growth parameters and on the expression of genes involved in auxin transport and N-assimilation in tomato seedlings. NH4+ nutrition led to an inhibitory effect on root fresh weight (FW), lateral root (LR) number and root density, while an increase in the primary root (PR) length was observed. The expression of N assimilation genes GS2 and ASN1, is affected by NH4+ nutrition. Moreover, in order to relieve the toxic effect of NH4+ on root development, glucose or 2-oxoglutarate was supplied as a C source during NH4+ treatment. The addition of 2-oxoglutarate improved root parameters compared to the NH4+ regimen. N-assimilation gene analysis showed that NH4+-fed tomato plants try to alleviate the toxic effect by concurrently upregulating ASN1 and anaplerotic PEPC2 expression, whereas when 2-oxoglutarate is supplied, ASN1 induction was not observed. The addition of both C skeletons induced the expression of the ROS-scavenging genes GSH and SOD. In addition, since ABA plays a role in root development, the ABA-synthesis-defective mutant flacca was studied under NO3− and NH4+ regimens. It displayed a decrease in LR number under NO3− conditions, whereas, the NH4+-fed seedlings showed a decrease solely in PR length that was reverted when ABA was exogenously supplied. Moreover, flacca seedlings displayed a reprogramming of the N/C assimilation genes. Altogether, these results reflect the importance of N and C sources and ABA homeostasis in root development of tomato seedlings. [-]
Publicado en
Plant Physiology and Biochemistry, Volume 148, March 2020.Proyecto de investigación
GL2013-49023-C03-02-R and AGL2017-85987-C3-1-R, UJI-A2016-09, UJI-PREDOC/2016/27Derechos de acceso
0981-9428/ © 2020 Elsevier Masson SAS. All rights reserved.
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