Seasonal and genetic influences on sex expression in a backcrossed segregating papaya population

Ramos, Helaine Christine Cancela; Pereira, Messias Gonzaga; Silva, Francisco Filho da; Viana, Alexandre Pío; Ferreguetti, Geraldo Antônio

doi:10.1590/s1984-70332011000200001

Cited by 29 publications

(18 citation statements)

References 9 publications

(10 reference statements)

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“…Objetivando amenizar esta relação, a Universidade Estadual do Norte Fluminense Darcy Ribeiro vem, em parceria com a fazenda Caliman Agrícola S & A conduzindo ao longo dos últimos 15 anos, um programa de melhoramento genético do mamoeiro na expectativa de oferecer aos produtores cultivares e/ou híbridos de alto desempenho, adaptados e estáveis (Marin et al, 2006;Silva et al, 2008;Ramos et al, 2011).…”

Section: Introductionunclassified

Metodologia dos modelos mistos para seleção combinada em progênies segregantes de mamoeiro

Pinto

Luz

Pereira

et al. 2013

Agraria

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RESUMOApesar de o Brasil se destacar como um dos principais produtores mundiais de mamão, ainda existe um reduzido número de linhagens/híbridos disponíveis para comercialização. O presente trabalho objetivou selecionar linhagens entre e dentro de progênies em uma população segregante de mamoeiro para avanço das autofecundações. Originalmente a população foi desenvolvida via retrocruzamento objetivando a incorporação (característica Golden) para tolerância à mancha fisiológica nos genitores do híbrido UENF/CALIMAN01, motivo pelo qual foi utilizado um índice de seleção denominado IG2 amparado nos valores genotípicos individuais obtidos via modelos mistos, pelo procedimento REML/BLUP. O resultado da análise permitiu selecionar oito progênies que segregaram para a característica "tipo Golden": 11, 13, 14, 15, 16 19, 18 e 12; dentro das progênies as plantas apresentaram valores superiores de ganho e média predita em relação às testemunhas (JS12, SS72/12 e Golden) para as seguintes características: altura de inserção do primeiro fruto, firmeza da polpa e do fruto e produção. Foram selecionadas 20 plantas com a característica "tipo Golden" visando ao avanço de geração de autofecundação e retrocruzamento. Palavras-chave:Carica papaya L., índice de seleção, REML/BLUP Mixed model for combining selection in segregate progeny of papaya ABSTRACT Although Brazil stands out as a leading global producer of papaya still exists a small number of lines/hybrids available for its cultivation. To obtain new cultivars it is necessary to direct efforts towards the identification and selection of superior genotypes and broadening the genetic basis of the species. This study aimed to select lines between and within families in a segregating population of papaya for advancement of self pollination and backcross. Originally the backcross population aimed the introgression of the physiological disturb (Golden type) into the UENF/CALIMAN01 genitors. For this a selection index named IG2 was used supported in individual genotypic values obtained through mixed models by REML/BLUP. Analysis of results permitted selection of eight progenies and segregated for the trait "Golden Type": 11, 13, 14, 15, 16, 19, 18 and 12. The selected genotypes within each progeny showed higher values of gain and predicted average than the controls (JS12, SS72/12 and Golden) for the following characteristics: height of insertion of the first fruit, firmness of fruit and production. Twenty plants e selected with the characteristic "Golden Type" for the advancement of generation of selfing and backcross.

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Section: Introductionunclassified

Metodologia dos modelos mistos para seleção combinada em progênies segregantes de mamoeiro

Pinto

Luz

Pereira

et al. 2013

Agraria

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“…Segregation of putative resistance genes is also the most likely explanation for the occurrence of infected plants in accessions classified as resistant. Ramos et al (2011) suggested that the Golden cultivar consists of a fixed non-genetic type and, consequently, is subject to high rates of segregation.…”

Section: Resultsmentioning

confidence: 99%

Screening of papaya accessions resistant to Papaya lethal yellowing virus and capacity of Tetranychus urticae to transmit the virus

Basso

Pereira

et al. 2015

Pesq. agropec. bras.

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-The objective of this work was to produce a polyclonal antiserum against the coat protein (CP) of Papaya lethal yellowing virus (PLYV) and to determine its specificity and sensibility in the diagnosis of the virus, as well as to evaluate the genetic resistance to PLYV in papaya (Carica papaya) accessions and to investigate the capacity of the two-spotted spider mite Tetranychus urticae to acquire and transmit PLYV to the plants. Sixty-five papaya accessions were evaluated. For each accession, ten plants were mechanically inoculated using PLYV-infected plant extracts, and three plants were mock inoculated with phosphate buffer alone and used as negative controls. Ninety days after inoculation, newly-emerging systemic leaves were collected from the inoculated plants, and viral infection was diagnosed by indirect Elisa, using polyclonal antiserum sensible to the in vitro-expressed PLYV CP. Viral transmission by T. urticae was evaluated in greenhouse. The experiments were repeated twice. Polyclonal antiserum recognized the recombinant PLYV CP specifically and discriminated PLYV infection from infections caused by other plant viruses. Out of the 65 papaya accessions evaluated, 15 were considered resistant, 18 moderately resistant, and 32 susceptible. The two-spotted spider mite T. urticae was capable of acquiring PLYV, but not of transmitting it to papaya.Index terms: Carica papaya, Elisa, genetic resistance, plant breeding, PLYV, two-spotted spider mite. Termos para indexação: Carica papaya, Elisa, resistência genética, melhoramento de plantas, PLYV, ácaro rajado. Identificação de acessos de mamoeiro resistentes ao

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“…Floral anomalies reflect negatively on commercial fruit production, so the increased availability of varieties less sensitive to the influence of seasonality on sexual expression is of great importance for the cultivation of papaya and should reduce production fluctuations occurring throughout the year. As a consequence, the producer will have increased chances of success in crop exploitation (Ramos et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Quantification of floral abnormalities in a population generated from sexual polymorphism aiming at recurrent selection in papaya

et al. 2019

Self Cite

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The aim of this study was to estimate the percentage of deformed fruits (carpelloid, pentandric, and bananoid), summer sterility, repeatability coefficients, and correlations among the variables for floral abnormalities; and select genotypes with the lowest incidence of deformed fruits and summer sterility. In the experiment, which involved 254 plants, traits were evaluated using the digital-phenotypic method and the obtained images were processed and analysed using ImageJ v1.48 software with the Cell Counter plugin. Summer sterility had the highest percentage of occurrence in the evaluated periods. Based on the quantification of total abnormalities, the 30 genotypes with the lowest incidence of floral abnormalities were selected. Summer sterility is the main BASIC AREAS -Article problem of the papaya crop in terms of floral abnormalities. The non-significant correlations between the traits: NDF/TNF+NFN (number of deformed fruits/number of fruits + number of fruitless nodes) and NFS/TNF+NFN (number of fruitless nodes/number of fruits + number of fruitless nodes); NDF/TNF+NFN and NFN/SUM (number of fruitless nodes/sum of abnormalities); and NFS/TNF+NFN and NDF/SUM (number of deformed fruits/sum of abnormalities) indicate that the variables are independent of each other. Of the 254 evaluated progenies, at least 30 were identified as having potential for selection, with lower occurrence of total floral abnormalities.

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Seasonal and genetic influences on sex expression in a backcrossed segregating papaya population

Abstract: ABSTRACT

Cited by 29 publications

References 9 publications

Metodologia dos modelos mistos para seleção combinada em progênies segregantes de mamoeiro

Metodologia dos modelos mistos para seleção combinada em progênies segregantes de mamoeiro

Screening of papaya accessions resistant to Papaya lethal yellowing virus and capacity of Tetranychus urticae to transmit the virus

Quantification of floral abnormalities in a population generated from sexual polymorphism aiming at recurrent selection in papaya

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