Seleção de linhagens com tolerância ao calor em germoplasma de tomateiro coletado na região Norte do Brasil

Giordano, Leonardo de B.; Boiteux, L. S.; Silva, João Bosco C. da; Carrijo, Osmar Alves

doi:10.1590/s0102-05362005000100022

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…Proper fruit coloring is also affected by extreme temperatures; lycopene and carotenes are not synthesized at high temperatures, which precludes normal coloring in ripe fruits. Hence, heat tolerance is a major selection trait for tomato breeding programs targeting wet lowland climates in equatorial and tropical areas of the world (Giordano et al 2005).…”

Section: Resultsmentioning

confidence: 99%

Studying the effect of environmental variables on the genotype × environment interaction of tomato

et al. 2006

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Genotype · environment interaction (GEI) affects marketable fruit yield and average fruit weight of both hybrid and open-pollinated (OP) tomato genotypes. Cultivars vary significantly for marketable fruit yield, with hybrid cultivars having, on average, higher yield than OP cultivars. However, information is scanty on environmental factors affecting the differential response of tomato genotypes across environments. Hence, the aim of this research was to use factorial regression (FR) and partial least squares (PLS) regression, which incorporate external environmental and genotypic covariables directly into the model for interpreting GEI. In this research, data from an FAO multi-environment trial comprising 15 tomato genotypes (7 hybrid and 8 OP) evaluated in 18 locations of Latin America and the Caribbean were analyzed using FR and PLS. Environmental factors such as days to harvest, soil pH, mean temperature (MET), potassium available in the soil, and phosphorus fertilizer accounted for a sizeable portion of GEI for marketable fruit yield, whereas trimming, irrigation, soil organic matter, and nitrogen and phosphorus fertilizers were important environmental covariables for explaining GEI of average fruit weight. Locations with relatively high minimum and mean temperatures favored the marketable fruit yield of OP heat-tolerant lines CL 5915-223 and CL 5915-93. An OP cultivar (Catalina) and a hybrid (Apla) showed average marketable fruit yield across environments, while two hybrids (Sunny and Luxor) exhibited outstanding marketable fruit yield in high yielding locations (due to lower temperatures and higher pH) but a sharp yield loss in poor environments. Two stable hybrid genotypes in high yielding environments, Narita and BHN-39, also showed high and stable yield in average and low yielding environments.

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Section: Resultsmentioning

confidence: 99%

Studying the effect of environmental variables on the genotype × environment interaction of tomato

et al. 2006

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“…Thus, experiments at field conditions for select cultivars which are tolerant, especially to heat, are needed and still are a suitable methodology for this purpose (GIORDANO et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Mini Tomato Cultivars for the Sub-Mid São Francisco Valley, Brazil

Yuri¹,

Costa²,

Lima³

et al. 2016

Rev. Caatinga

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-Two experiments were conducted in Petrolina, State of Pernambuco (PE), Brazil, in order to evaluate the performance of mini tomato cultivars under the conditions of the Sub-Mid São Francisco Valley. One on crops of the second half of the year (SH) from August to December 2012, and other on crops of the first half of the year (FH) from March to July 2013. Six mini tomato cultivars were evaluated in both seasons: E5663, Kada, F1170, Tanzimech, E1275 and Abirú. A randomized block experimental design was used, with four replications, arranged in split plot, with the growing seasons in the plots and cultivars in the subplots. The total and commercial fruit yield, soluble solid contents, fruit yield per plant, number of fruits per plant, and fruit fresh weight were evaluated. The total yield was higher in the FH, regardless of the cultivar used. The cultivar E5663 presented yield of 40.3 Mg ha -1 in the SH and 104.0 Mg ha -1 in the FH. Commercial yield, soluble solid content and yield per plant followed the same trend. The number of fruits per plant ranged from 390.8 to 941.4 (FH) and from 80.5 to 315.4 (SH). The cultivar E5663 presented the best yield and soluble solid content responses, thus, it may be recommended for the conditions of Petrolina PE, and can be adopted for planting in both seasons evaluated.Keywords: Solanum lycopersicum L.. Yield. Semiarid region. CULTIVARES DE MINITOMATE PARA O SUBMÉDIO DO VALE DO SÃO FRANCISCORESUMO -Dois experimentos foram conduzidos em Petrolina PE, com o objetivo de avaliar o comportamento produtivo de cultivares de minitomate, nas condições do Submédio do Vale do São Francisco. O primeiro, entre agosto e dezembro de 2012 (segundo semestre), e o segundo, entre março e julho de 2013 (primeiro semestre). Para as duas épocas, foram avaliados seis cultivares de minitomate: E5663; Kada; F1170; Tanzimech; E1275 e Abirú. O delineamento experimental foi de blocos casualizados, com quatro repetições dispostas em parcelas subdivididas, testando-se nas parcelas as duas épocas de cultivo e nas subparcelas, os genótipos. Avaliou-se produtividade total e comercial de frutos, teor de sólidos solúveis, número de frutos por planta, massa fresca de frutos por planta e massa fresca de fruto. A produtividade total, independentemente do genótipo, no cultivo de primeiro semestre foi superior. No cultivo de segundo semestre, a cultivar E5663 apresentou produtividade de 40,3 Mg ha -1 . No primeiro semestre, com esse mesmo genótipo, obteve-se produtividade de 104,0 Mg ha -1 . A produtividade comercial, o teor de sólidos solúveis e a produção por planta seguiram a mesma tendência. Quanto ao número de frutos por planta, foi verificada uma variação de 390,8 a 941,4 e 80,5 a 315,4 frutos por planta, para o primeiro semestre e segundo semestre, respectivamente. O genótipo E5663, por ter apresentado as melhores respostas produtivas e teor de sólidos solúveis, pode ser indicado para as condições de Petrolina-PE, ressaltando-se que este pode ser adotado nos dois períodos de cultivo do ano.Palavras-ch...

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“…Analyses of reproductive thermotolerance has been carried out in several tomato genotypes, including cultivars [ 11 , 29 , 30 , 31 , 32 , 33 ], breeding lines [ 19 , 32 , 34 ] and wild relatives [ 7 , 35 ]. Up to date, few studies have addressed the response to heat in tomato landraces [ 36 , 37 ], those cultivated populations adapted to specific climatic and agronomic conditions and preserved by farmers [ 38 ]. Opposite to modern breeding material that has been selected for high fertility (style insertion, high number of flowers, good fruit setting), landraces represent more ‘primitive’ genotypes that, beside possible defects in disease resistance and productivity, combine a high environmental adaptation and fruit quality.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Fertility-Related Traits in Tomato Landraces under Mild and Severe Heat Stress

Farinon¹,

Picarella²,

Mazzucato³

2022

Plants

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Studies on the reproductive dynamics under heat stress are crucial to breed more tolerant cultivars. In tomato, cultivars, breeding lines, and wild species have been evaluated for their response to heat stress. Here, we addressed the study to a panel of selected landraces representing traditional genotypes that usually show high adaptation to local environments. In two experiments, spaced by 12 years, we set-up an identical experimental design with plants transplanted at two different dates to expose the second field to thermic stress with natural fluctuations. Such a strategy resulted in both a mild and severe stress in the two years. The landraces showed wide variation for both vegetative and reproductive traits; all traits were affected by heat, mostly with a significant Genotype*Environment interaction. A high broad-sense heritability was estimated for plant height, stigma position, pollen viability, and fruit weight. Low heritability estimates were found for the number of flowers, fruit set, and yield. Despite the interaction, traits recorded under control and heat conditions were positively correlated. Multivariate analysis located the genotypes in a topography that was stable under all conditions, except under the harshest temperatures. The study revealed that landraces present a wide variability for the response of reproductive traits to thermic challenges and that such a variation could be useful to dissect the traits with higher heritability and identify quantitative trait loci for breeding more resilient varieties.

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Seleção de linhagens com tolerância ao calor em germoplasma de tomateiro coletado na região Norte do Brasil

Cited by 7 publications

References 11 publications

Studying the effect of environmental variables on the genotype × environment interaction of tomato

Studying the effect of environmental variables on the genotype × environment interaction of tomato

Mini Tomato Cultivars for the Sub-Mid São Francisco Valley, Brazil

Dynamics of Fertility-Related Traits in Tomato Landraces under Mild and Severe Heat Stress

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