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New source of alleles for resistance to black spot and phoma spot in papaya (Carica papaya L.)

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Abstract

The papaya (Carica papaya L.) breeding program carried out by UENF has endeavored to develop resistant genotypes. A way to obtain such materials and broaden their genetic base is by incorporating resistance alleles extracted from dioecious genotypes into breeding programs. This study aimed to examine the morpho-agronomic attributes and aspects of resistance to black spot and phoma spot in a new hermaphrodite genotype (H-M3), which was identified in a resistant dioecious progeny (PD-M3). Twenty-one traits were evaluated in six genotypes in a randomized-block design with ten replicates and two plants per plot. Analysis of variance and means test were performed. Genetic parameters and divergence analysis were performed. The H-M3 genotype was near to ‘Calimosa’ and Maradol in the analyzed clusters, indicating good morpho-agronomic attributes and resistance. The proximity of H-M3 to the Maradol genotype is important since Maradol has already been reported as being resistant to black spot and exhibiting lower severity and incidence of phoma spot. Therefore, H-M3 emerges as a promising material for papaya breeding, as it encompasses favorable agronomic traits and moderate resistance.

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Abbreviations

AFW:

Average fruit weight

CCC:

Cophenetic correlation coefficient

CVe:

Experimental coefficient of variation

CVg:

Genotypic coefficient of variation

FD:

Fruit diameter

FF:

Fruit firmness

FL:

Fruit length

HIFF:

Height insertion of the first fruit

H-M3:

Hermaphrodite

H2 :

Genotypic coefficient of determination

IBSF:

Incidence of black spot in the fruit

IBSL:

Incidence of black spot in the leaf

IPSL:

Incidence of phoma spot in the leaf

Iv:

Variation index

NDF:

Number of deformed fruits

NFN:

Number of fruitless nodes

NMF:

Number of marketable fruits

PD-M3:

M3 dioecious progeny

PF:

Pulp firmness

PH:

Plant height

PT:

Pulp thickness

PROD:

Production

SBSF:

Severity of black spot in the fruit

SBSL:

Severity of black spot in the leaf

SD:

Stem diameter

SPSL:

Severity of phoma spot in the leaf

SSC:

Soluble solids content

TNF:

Total number of fruits

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Acknowledgements

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001. We also thank the Universidade Estadual do Norte Fluminense “Darcy Ribeiro” (UENF), the Carlos Chagas Filho Foundation for Research Support of the State of Rio de Janeiro (FAPERJ), and the National Council for Scientific and Technological Development (CNPq) for fellowship grants and project financing and the Caliman Agrícola S/A company (CALIMAN) for logistical support.

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Correspondence to Adriana Azevedo Vimercati Pirovani.

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Pirovani, A.A.V., Ramos, H.C.C., Santa-Catarina, R. et al. New source of alleles for resistance to black spot and phoma spot in papaya (Carica papaya L.). Euphytica 217, 132 (2021). https://doi.org/10.1007/s10681-021-02863-3

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  • DOI: https://doi.org/10.1007/s10681-021-02863-3

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