Déficit hídrico induzido por manitol para seleção de genótipos de tomateiro

Maciel, Gabriel Mascarenhas; Berenguer, Andrea Farneze; Silva, Ernani C. da; Fraga, E. F.; Rocha, Débora Kelli; Rocha, Jaíne Priscila R. da

doi:10.4322/rca.2482

Cited by 3 publications

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“…In addition, it is the vehicle responsible for the translocation and transformation of reserves, fundamental for seed germination and seedling growth (Bewley et al, 2013;Marcos-Filho, 2015;Obroucheva et al, 2017). In general, there are few studies aimed at obtaining tomato genotypes tolerant to water deficit in the germination stage, which limits the number of commercial cultivars with satisfactory levels of drought tolerance (Maciel et al, 2017). According to Bernier et al (2008), this fact is related to the complexity of water deficit tolerance, which is controlled by many genes and is affected by stress intensity.…”

Section: Introductionmentioning

confidence: 99%

Osmopriming with selenium: physical and physiological quality of tomato seeds in response to water deficit

et al. 2023

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Tomato is a crop sensitive to water deficit and the responses of seeds to germination under these conditions involve biochemical, physiological, and molecular processes. The aim of this study was to evaluate the physical, physiological, and biochemical changes in tomato seeds osmoprimed with selenium (Se) and subjected to water deficit during germination. Tomato seeds of the LA 4050 and LA 3475 accessions were osmoprimed with PEG 6000 solution (-1.0 MPa) plus Na2SeO4 (12.5 μM) or only with PEG 6000 solution for 24 h or unprimed. The seeds from the different treatments were subjected to water deficit (-0.3 MPa) or to control (0 MPa). Image analyses were performed (X-ray), physiological variables were obtained by the germination test and activities of SOD, CAT and POX enzymes were determined. Osmopriming, especially with PEG, provided the seeds of both accessions with higher densities and gray mean when compared to unprimed ones. Seeds under water deficit showed lower physiological performance and lower enzymatic activity. Se did not induce seed resistance to water deficit. Osmopriming with PEG 6000 at -1.0 MPa is an efficient technique for improving the physiological quality of seeds of tomato accessions susceptible and tolerant to water deficit. Moreover, the antioxidant enzyme CAT proved to be an indicator of oxidative stress tolerance in tomato seedlings under water deficit.

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Section: Introductionmentioning

confidence: 99%

Osmopriming with selenium: physical and physiological quality of tomato seeds in response to water deficit

et al. 2023

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“…To simulate drought, MS culture media was prepared (Murashige & Skoog, 1962) with 20 g L −1 sucrose, 8 g L −1 agar and supplemented with 22.29 g L −1 of mannitol PA (C 6 H 14 O 6 —P.M. 182.17) to reach the osmotic potential of −.3 MPa (Maciel et al, 2017). The pH of the culture medium was adjusted to 5.8.…”

Section: Methodsmentioning

confidence: 99%

“…The evaluations were performed in a laminar flow chamber, maintaining aseptic conditions. Seeds that did not germinate or seedlings with reduced development due to mannitol were considered susceptible to drought (Maciel et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

Selection for drought tolerance in backcross populations derived from interspecific crosses of Solanum lycopersicum × Solanum pennellii

Henschel,

Batista,

de Souza de Voltare

et al. 2023

Plant Breeding

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Drought strongly limits tomato yield, and the introgression of genes from wild tomatoes is a powerful tool to obtain drought‐tolerant progenies. The aim of this study was to select drought‐tolerant transgressive progeny obtained from interspecific crosses between drought‐susceptible tomatoes (Solanum lycopersicum) × drought‐tolerant wild species (Solanum pennellii) under in vitro and greenhouse conditions. BC1F2 populations were advanced from backcrosses between F1 × Jumbo AG‐592 (cultivar for fresh consumption) and F1 × BRS Tospodoro (cultivar for industrial processing). For this, BC1F2 seeds were germinated in vitro and evaluated for tolerance to drought. Then, eight genotypes from each BC1F2 were selected and submitted to 14 days of drought (0% of water supply) or well‐watered (100% of water supply) in greenhouse conditions and evaluated for growth, water balance and gas exchanges. Using in vitro assays with mannitol‐induced drought proved to be effective for the initial screening of drought‐tolerant BC1F2 plants, while greenhouse experiments showed that drought decreased photosynthesis in all genotypes, but almost all the BC1F2 progenies had greater photosynthetic capacity, water balance and growth than their commercial parents. As a result, we selected six progenies for fresh consumption and six progenies for industrial processing with increased drought tolerance.

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“…UFU-040 é uma linhagem pré-comercial de hábito de crescimento determinado, com potencial agronômico pertencente ao banco de germoplasma da UFU. O acesso selvagem S. pennellii possui genes responsáveis por conferir a eficiência do uso da água (WELL) (ATARÉS et al, 2011;MORALES et al, 2015aROCHA et al, 2016MACIEL et al, 2017).…”

Section: Methodsunclassified

Estimativas de ganho genético por diferentes critérios de seleção em genótipos de tomateiro sob deficiência hídrica

Oliveira¹

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OLIVEIRA, CAMILA SOARES. Genetic gain estimates by different selection criteria in tomato genotypes under water deficit. 2019. 30 p. Dissertation (Master Program Agronomy/Crop Science)-Federal University of Uberlândia. 1 Tomato crops require high amounts of water and are negatively affected when submitted to water restriction conditions. This may be minimized by using the introgression of genes responsible for controlling the tolerance to water deficits. However, the characteristics related to this type of tolerance are highly complex, which limits selection inferences. The use of selection indexes may be an efficient tool to select genotypes that are more tolerant. This research aims to assess selection indexes based on the estimated genetic gains, as well as to select tomato plant genotypes after they have been submitted to conditions of water deficit through different selection criteria. The research took place at the Horticultural Experiment Station of the Federal University of Uberlandia and was conducted in Random Block Design (RBD) with three repetitions. We used seven genotypes from the interspecific cross between S. pennellii vs UFU-040, Solanum pennelli the donor parent, UFU-040 the recurrent parent and the cv. Santa Clara, totaling ten treatments. Plants were submitted to a moderate water deficit with a matric potential of-34 kPa. We analyzed foliar temperature, the SPAD index, leaf water potential, amount of fruits produced per plant, average fruit weight, yield per plant, incidence of apical rotting, dry matter of the aerial part percentage, root and total, amount of leaves, plant height, and distance of 1 st bunch relative to the substrate. In sequence, analysis of variance, Scott-Knott's and Dunnett's tests for comparison of means, genotypes' relative superiority tests and analysis of selection indexes were performed. The genitor donor, wild accession S. pennellii, was indeed tolerant to water deficit and the Santa Clara cultivar was sensitive to water restriction. This fact reinforces the wild accession's genetic potential of S. pennellii for introgression of genes that promote water deficit tolerance. The T5 genotype presented agronomic potential and satisfactory levels of water deficit tolerance, and it was 58,2% higher in production than the pre-commercial lineage and the UFU-040 recurrent parent. The ideotype-genotype distance selection index is the most appropriate for selection of tomato plant genotypes submitted to water deficit.

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Déficit hídrico induzido por manitol para seleção de genótipos de tomateiro

Cited by 3 publications

References 0 publications

Osmopriming with selenium: physical and physiological quality of tomato seeds in response to water deficit

Osmopriming with selenium: physical and physiological quality of tomato seeds in response to water deficit

Selection for drought tolerance in backcross populations derived from interspecific crosses of Solanum lycopersicum × Solanum pennellii

Estimativas de ganho genético por diferentes critérios de seleção em genótipos de tomateiro sob deficiência hídrica

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