Efeito do pólen nas características físicas e fisiológicas de sementes de mamão

Martins, Gabriela Neves; Pereira, Messias Gonzaga; Silva, Roberto Ferreira da; Oliveira, Anna Christina Sanazário de; Silva, Franceli da

doi:10.1590/s0101-31222009000200002

Cited by 5 publications

(5 citation statements)

References 25 publications

(13 reference statements)

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“…This study can guide breeding programs for the establishment of hybrids with lower levels of black spot in leaves and fruit and of phoma spot in leaves, as well as provide information on quality traits of plant and fruit. Similarly, as observed for morpho-agronomic characters (Marin et al 2006) and physiological quality of seeds (Martins et al 2009) in papaya, heterosis is a common effect for traits associated with resistance to papaya fungal diseases. Recently, Vivas et al (2012bVivas et al ( , 2013 pointed out that heterosis in papaya for resistance to black spot and to phoma spot may provide significant genetic gains, thereby contributing to the reduction of chemical control in the crop.…”

Section: Resistance To Phoma Spotsupporting

confidence: 55%

“…In papaya, Marin et al (2006), studying heterotic effects among eight parents of the 'Solo' group and eight of the 'Formosa' group, observed the prevalence of heterobeltiosis in nine morphoragronomics characteristics, concluding that heterosis is a common effect in papaya hybrids. Martins et al (2009) observed the early manifestation of heterosis in F 1 hybrids for physiological attributes of papaya seeds. Vivas et al (2012a) reported that heterosis in papaya for resistance to black spot may provide significant genetic gains from both inter-and intra-heterotic crosses.…”

Section: Introductionmentioning

confidence: 98%

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Heterosis and genetic diversity for selection of papaya hybrids for resistance to black spot and phoma spot

Vivas

Ramos

Santos

et al. 2016

Trop. plant pathol.

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In this work, two experiments were set up in order to select papaya hybrids and verify heterosis expression for black spot (Asperisporium caricae) and phoma spot (Stagonoparopsis caricae) resistance. Experiments were set up in randomized blocks with two replications. Black spot and phoma spot incidence and severity on leaves were evaluated, and fruit damaged area by black spot was estimated. These characteristics were used to estimate genetic distance with complement of Jaccard's Index. For black spot resistance, 77 % of hybrids showed heterosis for at least one of three evaluated characteristics and 58 % of hybrids showed heterobeltiosis effect. For phoma spot severity, there was heterosis manifestation in 56 % of hybrids, and 30 % of them showed heterobeltiosis effect. Therefore, heterosis was found in most of the hybrids, emphasizing the possibility of using hybridization to develop resistant genotypes. We observed that the best estimates of heterotic effects were obtained by crossing genetically distant individuals, indicating the existence of a positive relationship between genetic distance and hybrid performance. Together, the results highlight the hybrid 'Americano' x 'Waimanalo' as having a strong potential to reduce the intensity of these two diseases.

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Section: Resistance To Phoma Spotsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 98%

Heterosis and genetic diversity for selection of papaya hybrids for resistance to black spot and phoma spot

Vivas

Ramos

Santos

et al. 2016

Trop. plant pathol.

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“…Our results reinforce the theory that heterosis is a common effect in papaya hybrids, with great potential to be explored. These results reinforce other reports for morpho-agronomic characteristics (5, 17), physiological seed quality (19) and disease resistance (13,29,30,26).…”

Section: Resultssupporting

confidence: 92%

“…In papaya, the possibility of exploring heterosis is already reported for morpho-agronomic characteristics (5, 17), physiological seed quality (19) and disease resistance (13,27,29,26). Falconer (9) suggests that, at any degree of dominance above zero, heterosis is a function of allele frequency between the parents; therefore, there is a positive correlation between genetic divergence and heterosis.…”

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confidence: 99%

Genetic diversity between papaya lines and their correlation with heterosis in hybrids for disease resistance and morpho-agronomic traits

et al. 2018

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This study aimed to verify if the genetic divergence between papaya lines, obtained by means of molecular markers, is correlated with heterosis in the hybrids for characteristics related to production, fruit quality and disease resistance. Eight parents and 56 hybrids obtained from diallel crosses were evaluated in randomized blocks, with four replicates. The number of commercial fruits (NCF), the average fruit weight (AFW), the productivity (PROD), the fruit firmness (FIRM) and the total soluble solids (TSS) were evaluated, as well as the severity of black spot on leaves (BSS) and fruits (BSSFr), phoma spot (PSS) and powdery mildew on leaves (PMS). Correlations were estimated between genetic divergence, obtained based on Vivas, M.; Cardoso, D.L.; Ramos, H.C.C.; Santos, P.H.D.; Silveira, S.F.; Moraes, R.; Pereira, M.G. Genetic diversity between papaya lines and their correlation with heterosis in hybrids for disease resistance and morpho-agronomic traits. Summa Phytopathologica, v.44, n.1, p.110-115, 2018. SSR, and heterosis, estimated for each characteristic in four possibilities of crossings within the diallel: i) all crossings; ii) between parents of the 'Solo' group; iii) between parents of the 'Formosa' group; and iv) between parents of 'Solo' with 'Formosa' group and 'Formosa' with 'Solo' group. Results indicate the possibility of exploring heterosis both in crossings between groups and in crossings within groups. The low magnitude of the estimates of correlation between heterosis and morphological characteristics of the hybrids with genetic distance obtained by SSR in the parents indicates that the behavior of hybrids cannot be inferred based on the genetic divergence between parents.Keywords: Carica papaya, diallel, hybridization, plant breeding.Papaya (Carica papaya L.), one of the tropical plants with major importance for the national and world's fruit production, is cultivated in several Brazilian states. One of the bottlenecks of this crop is the lack of commercial varieties and hybrids that meet the requirements of the domestic and external market; thus, breeding programs with this attempt should be intensified. Breeding programs in papaya aim to obtain lineages and use them in hybridization programs with the focus on hybrid vigor or heterosis, a phenomenon that provides great productivity to hybrids from the crossing of highly divergent parents.In papaya, the possibility of exploring heterosis is already reported for morpho-agronomic characteristics (5, 17), physiological seed quality (19) and disease resistance (13,27,29,26). Falconer (9) suggests that, at any degree of dominance above zero, heterosis is a function of allele frequency between the parents; therefore, there is a positive correlation between genetic divergence and heterosis. For this reason, lineage diversity estimates can be used as a predicting tool of superior crosses in plant breeding programs (14). Studies with lineages obtained from the populations BR-105 and BR-106, correlating productivity and genetic divergence es...

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“…According to Andrade and Pereira (2005), heterosis, explored in hybrids in general, does not usually appear in F 1 seeds (sown by the producer), but rather in plants originating from these seeds. However, Martins et al (2009), evaluating the effect of pollen on the physical and physiological traits of papaya seeds, reported the absence of xenia for the physical attributes of these seeds, while for the physiological attributes, they highlighted the importance of carrying out controlled pollination for these traits, because of the early manifestation of heterosis.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of seed physiological quality of papaya elite hybrids, their reciprocal crosses and parents

Macedo¹,

Pereira²,

Cardoso³

et al. 2013

J. Seed Sci.

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This study aimed to evaluate the physiological quality of seeds of three hybrid combinations and their reciprocals, as well as the selfed parents, and to estimate genetic parameters associated with seed quality, and possible reciprocal effects. The experiment used F 1 hybrid papaya seeds and their reciprocal crosses between JS12 and Sunrise Solo 72/12, Sekati and Waimanalo, and the seeds of the parents and two varieties, totaling 12 treatments in a completely randomized design with four replications. Weight of 1,000 seeds, germination, seedling fresh weight and seedling dry weight, first count, speed of germination and seedling emergence were determined. There was no xenia effect for weight of 1,000 seeds and seedling fresh weight. The reciprocal effect was not expressed for germination and seedling emergence, while for the other traits, it was not expressed only for JS12 x Sekati. Differences among hybrids and their parents occurred as a result of the action of pollen in the crosses, and justified by early heterosis. The most sensitive vigor tests to discriminate differences in performance of hybrids and their reciprocals were speed of germination and seedling fresh weight. There were high magnitudes of the estimates for the genotypic determination coefficient for most of the evaluated variables, except for seedling fresh weight.Index terms: Carica papaya L., maternal effect, reciprocal effect, early heterosis, genetic parameters.Avaliação de híbridos elite de mamão, de seus recíprocos e respectivos genitores, quanto à qualidade fisiológica de sementes RESUMO -O objetivo do presente trabalho foi avaliar a qualidade fisiológica das sementes de três combinações híbridas e seus recíprocos, além dos genitores autofecundados; estimar parâmetros genéticos associados à qualidade fisiológica, bem como possíveis efeitos recíprocos. Foram usadas sementes híbridas F 1 de mamão e seus respectivos recíprocos, provenientes dos cruzamentos JS12 com Sunrise Solo 72/12, Sekati e Waimanalo, e sementes dos genitores e duas cultivares, totalizando 12 tratamentos em delineamento experimental inteiramente casualizado com quatro repetições. Determinou-se a massa de mil sementes, germinação, massa fresca e massa seca de plântula, primeira contagem e velocidade de germinação e emergência de plântula. Houve ausência de xênia para massa de mil sementes e massa fresca de plântula. O efeito recíproco não se manifestou para germinação e emergência de plântula, sendo que para as demais características somente não se manifestou para JS12 x Sekati. Diferenças entre híbridos e genitores ocorreram em razão da ação do pólen no cruzamento, explicado pela heterose precoce. Os testes de vigor mais sensíveis para discriminar diferenças no desempenho dos híbridos e seus recíprocos foram velocidade de germinação e massa fresca de plântula. Verificaram-se magnitudes altas das estimativas do coeficiente de determinação genotípica para maioria das variáveis avaliadas, à exceção para massa fresca de plântula.Termos para indexação: Carica papaya L., efeito m...

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Efeito do pólen nas características físicas e fisiológicas de sementes de mamão

Cited by 5 publications

References 25 publications

Heterosis and genetic diversity for selection of papaya hybrids for resistance to black spot and phoma spot

Heterosis and genetic diversity for selection of papaya hybrids for resistance to black spot and phoma spot

Genetic diversity between papaya lines and their correlation with heterosis in hybrids for disease resistance and morpho-agronomic traits

Evaluation of seed physiological quality of papaya elite hybrids, their reciprocal crosses and parents

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