Divergência genética entre linhagens de melão e a heterose de seus híbridos

Paiva, Waldelice Oliveira de

doi:10.1590/s0102-05362002000100006

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…Accessions A-16, A-17 (conomon), and A-15 (momordica) were the most prolific, with 11.4, 7.3, and 6.9 fruits per plant, respectively (Table 1). In a study of genetic divergence with strains of three botanical varieties of Cucumis, the authors found also a strain of the group momordica that had the highest number of fruits per plant (Paiva, 2002).…”

Section: Morphoagronomic Genetic Divergencementioning

confidence: 99%

“…Although the thicknesses of the cavity and the soluble solids have many values around the mean, the extremes covered a wide range. In a study of genetic divergence with strains of melons of the botanical groups cantalupensis, inodorus, and momordica, soluble solids was also one of the characteristics that contributed most to the differentiation of genotypes (Paiva, 2002).…”

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Genetic divergence among accessions of melon from traditional agriculture of the Brazilian Northeast

Aragão¹,

Filho²,

Nunes³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. The genetic divergence of 38 melon accessions from traditional agriculture of the Brazilian Northeast and three commercial hybrids were evaluated using fruit descriptors and microsatellite markers. The melon germplasm belongs to the botanic varieties cantalupensis (19), momordica (7), conomon (4), and inodorus (3), and to eight genotypes that were identified only at the species level. The fruit descriptors evaluated were: number of fruits per plant (NPF), fruit mass (FM; kg), fruit longitudinal diameter (LD; cm), fruit transversal diameter (TD; cm), shape index based on the LD/TD ratio, flesh pulp thickness, cavity thickness (CT; cm), firmness fruit pulp (N), and soluble solids (SS; °Brix). The results showed high variability for all Genetic diversity of Cucumis melo from Brazilian Northeast descriptors, especially for NPF, LD, and FM. The grouping analysis based on fruit descriptors produced eight groups without taxonomic criteria. The LD (22.52%), NPF (19.70%), CT (16.13%), and SS (9.57%) characteristics were the descriptors that contributed the most to genotype dissimilarity. The 17 simple sequence repeat polymorphic markers amplified 41 alleles with an average of 2.41 alleles and three genotypes per locus. Some markers presented a high frequency for the main allele. The genetic diversity ranged from 0.07 to 0.60, the observed heterozygosity had very low values, and the mean polymorphism information content was 0.32. Molecular genetic similarity analyses clustered the accessions in 13 groups, also not following taxonomic ranks. There was no association between morphoagronomic and molecular groupings. In conclusion, there was great variability among the accessions and among and within botanic groups.

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Section: Morphoagronomic Genetic Divergencementioning

confidence: 99%

mentioning

confidence: 99%

Genetic divergence among accessions of melon from traditional agriculture of the Brazilian Northeast

Aragão¹,

Filho²,

Nunes³

et al. 2013

Genet. Mol. Res.

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“…However, no significant correlations were observed for the remaining characters, in the investigated populations (Figures 2 and 3). According to Paiva et al (2002), the combination of genetically distant parents does not always result in expressive heterosis. Paterniani et al (2008) reported that genetic distances were not correlated with heterosis, and that this trait does not allow inferences on promising crosses in breeding programs.…”

Section: Resultsmentioning

confidence: 99%

Heterosis and genetic distance in intervarietal corn hybrids

Baretta

Nardino

Carvalho

et al. 2019

Pesq. agropec. bras.

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The objective of this work was to evaluate the performance of intervarietal corn (Zea mays) hybrids with topcross crosses between landrace populations, and to confirm whether genetic dissimilarity between populations is correlated with the heterosis of the intervarietal hybrids in the field. Nine topcross hybrids were evaluated with their tester 'BRS Planalto', and the following landrace populations were used as parents: Argentino Branco, Dente de Ouro, Amarelão, Criolão, Caiano Rajado, Branco Oito Carreiras, Branco Roxo Índio, Cateto Branco, and Argentino Amarelo. The tester 'BRS Planalto' and the topcross hybrids Branco Oito Carreiras x 'BRS Planalto' and Criolão x 'BRS Planalto' showed higher per se potential for grain yield. The topcross hybrid Branco Oito Carreiras x 'BRS Planalto' showed a better performance for number of grains per row, grain weight, and ear diameter, whereas Criolão x 'BRS Planalto' displayed a better performance for the number of grains per row and ear length. Greater estimates of genetic distance did not necessarily result in greater heterosis values and were exclusively correlated with grain ear length. Therefore, it is not possible to predict the effects of high heterosis on grain yield, based on the genetic distance between the populations involved in the crosses.

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“…In the genetic divergence study from Paiva (2002) using lines of melons belonging to cantaloupensis, inodorus and momordica groups, and by Rizzo & Braz (2002) studying genetic divergence among five genotypes of net melon, soluble solid content was also one of the characters which most contributed to genetic variability.…”

Section: Resultsmentioning

confidence: 99%

Selection of processing tomato genotypes resistant to two spotted spider mite

et al. 2018

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One of the major problems in cultivation of tomato is the occurrence of pests and diseases. The objective of the research was to select genotypes from the second generation of the first backcross (F2BC1) between the tomato cultivar for processing S. lycopersicum (cv. Redenção) and the wild access S. habrochaites var. hirsutum (PI-127826), with high levels of zingiberene (ZGB), resistant to the twospotted spider mite Tetranychus urticae (Acari: Tetranychidae). From the F2BC1 population. The ZGB content was quantified and five plants with high zingiberene selected (RVTZ 2011-079-117, RVTZ 2011-079-185, RVTZ 2011-079-335, RVTZ 2011-079-345 and RVTZ 2011-079-503) and four with low zingiberene content (RVTZ 2011-079-417, RVTZ 2011-331-460, RVTZ 2011-079-538 and RVTZ 2011-079-548) were selected. Genotypes selected for high and low ZGB content and the parentals S. habrochaites var. hirsutum access PI-127826 and ‘Redenção’ were evaluated for repellency to the twospotted spider mite. There was a significant and inverse correlation between ZGB content and average distances travelled by mites on tomato leaflets. The genotypes of the F2BC1 generation with high zingiberene levels RVTZ 2011-079-117, RVTZ 2011-079-185, RVTZ 2011-079-335, RVTZ 2011-079-345 and RVTZ 2011-079-503 are promising for progress in achieving resistant lines to arthropod pests. Among them RVTZ 2011-079-117 stands out for resistance to twospotted spider mite.

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Divergência genética entre linhagens de melão e a heterose de seus híbridos

Cited by 8 publications

References 3 publications

Genetic divergence among accessions of melon from traditional agriculture of the Brazilian Northeast

Genetic divergence among accessions of melon from traditional agriculture of the Brazilian Northeast

Heterosis and genetic distance in intervarietal corn hybrids

Selection of processing tomato genotypes resistant to two spotted spider mite

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