Data/hora: 08/06/2024 11:50:08

Biblioteca(s): | Embrapa Semiárido.
Data corrente: | 21/10/2021
Data da última atualização: | 06/02/2024
Autoria: | RIBOLDI, L. B.; DIAS, R. Z.; CASTRO, P. R. de C e; FREITAS, S. T. de.
Afiliação: | LUCAS BAIOCHI RIBOLDI, ESALQ; RAFAELLA ZANETTI DIAS, ESALQ; PAULO ROBERTO DE CAMARGO E CASTRO, ESALQ; SERGIO TONETTO DE FREITAS, CPATSA.
Título: | 2,4-Epibrassinolide mechanisms regulating water use efciency and fruit production in tomato plants.
Ano de publicação: | 2021
Fonte/Imprenta: | Brazilian Journal of Botany, v. 44, p. 617-627, 2021.
DOI: | https://doi.org/10.1007/s40415-021-00745-5
Idioma: | Inglês
Conteúdo: | Tomato (Solanum lycopersicum L.) plants are able to adapt to restrictive environmental conditions mainly due to hormones such as brassinosteroids (BRs) that play important roles in determining stomata conductance and leaf transpiration. However, BRs efects on morphological traits like stomata and trichome position, size, and density, as well as on physiological traits resulting in better plant water use efciency (WUE) and productivity, remain poorly understood. The objective of this study was to better understand the 2,4-epibrassinolide (EBL) mechanisms regulating leaf transpiration and WUE that can afect fruit production in tomato plants. According to results, treating tomato plants with exogenous EBL resulted in lower leaf transpiration, mainly from 9 to 16 h during the day, as well as lower stomata conductance and aperture, higher leaf water potential, higher net CO2 assimilation rate, higher number of stomata and trichome on leaf abaxial and adaxial surfaces, and higher plant dry mass accumulation, which improved plant WUE, compared to non-treated plants. EBL treatment also increased fruit size, fruit production per plant, and fruit quality traits such as higher dry mass and soluble solids content. In conclusion, BRs can improve plant adaptation to water stress conditions by regulating important physiological and morphological mechanisms, controlling plant WUE, and leading to higher fruit production.
Palavras-Chave: | Área de abertura estomática; Assimilação de carbono; Densidade estomática; Tamanho do fruto; Turgor da folha; Uso da agua.
Thesagro: | Carbono; Tomate.
Thesaurus Nal: | Brassinosteroids; Solanum lycopersicum; Tomatoes.
Categoria do assunto: | G Melhoramento Genético
Registro original: | Embrapa Semiárido (CPATSA)
Exemplares: | CPATSA - (59665-1) - UPC - AP - DD -  -  -  - DIS