Estimation of genetic parameters for flower anomalies in papaya

Junior, Pedro Corrêa Damasceno; Pereira, Telma Nair Santana; Pereira, Messias Gonzaga

doi:10.1590/1984-70332018v18n1a2

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…Moreover, we can also infer that they possibly do not have linked or pleiotropic genes, which could minimize the efficiency of reducing both the number of nodes without fruits and deformed fruits in the population. Already, Damasceno Junior et al (2018) obtained a negative and significant correlation between summer sterility (NWF) and number of carpelloid fruits (NCF), which could lead to selection problems, since individuals showing a lower incidence of NWF can bear more carpelloid fruits. A significant positive correlation was obtained between NDF/TNF + NWF and NDF/SUM.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2019

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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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Section: Resultsmentioning

confidence: 99%

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

et al. 2019

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“…Hermaphrodite flowers abort carpels and reverse to functional male flowers [ 11 ]. These floral abnormalities caused by adverse environmental conditions have a negative effect on fruit production, leading to reduced yield [ 12 , 13 ]. Uncovering the underlying mechanism of sex determination and maintenance process would result methods to improve papaya with no sex reversal to increase fruit production.…”

Section: Introductionmentioning

confidence: 99%

Methylation related genes affect sex differentiation in dioecious and gynodioecious papaya

Zhou

Zhang

et al. 2022

Horticulture Research

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Morphological, genic and epigenetic differences often exist in separate sexes of dioecious and trioecious plants. However, the connections and relationships among them in different breeding systems are still unclear. Papaya has three sex types, which is genetically determined and epigenetically regulated, and was chosen as a model to study sex differentiation. Bisulfite sequencing of genomic DNA extracted from early-stage flowers revealed sex-specific genomic methylation landscapes and seasonally methylome reprogramming processes in dioecious and gynodioecious papaya grown in spring and summer. Extensive methylation of sex-determining region (SDR) was the distinguishing epigenetic characteristics of nascent XY sex chromosomes in papaya. Seasonal methylome reprogramming of early-stage flowers in both dioecy and gynodioecy systems were detected, resulting from transcriptional expression pattern alterations of methylation-modification-related and chromatin-remodeling-related genes, particularly from those genes involved in active demethylation. Genes involved in phytohormone signal transduction pathway in male flowers have played an important role in the formation of male-specific characteristics. These findings enhanced the understanding of the genetic and epigenetic contributions to sex differentiation and the complexity of sex chromosome evolution in trioecious plants.

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Flowering map of papaya germplasm: Support for genetic breeding and conservation programs

Ferreira

Souza

Moura

et al. 2022

Scientia Horticulturae

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Estimation of genetic parameters for flower anomalies in papaya

Cited by 6 publications

References 10 publications

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

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

Methylation related genes affect sex differentiation in dioecious and gynodioecious papaya

Flowering map of papaya germplasm: Support for genetic breeding and conservation programs

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