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Associating REML/BLUP and pedigree in developing sweet pepper (Capsicum annuum L.) progenies resistant to bacterial spot

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Abstract

Associating desirable agronomic characters of sweet peppers and resistance to bacterial spot (BS) has been challenging plant breeders, especially when seeking durable resistance. In this work, we select BS resistant progenies with desirable agronomic characteristics by mixed model. F2:3 plants derived from sixty F2 individuals from crosses between pure lines UENF 2285 (susceptible) × UENF 1381 (resistant) were phenotyped. For BS resistance assessment, 1320 seedlings were inoculated with Xanthomonas euvesicatoria in greenhouse. The progress of the disease on seedlings was evaluated by using a score scale, with values from one to five, for eleven consecutive days. With the values of the Area Under Disease Progress Curve (AUDPC), the components of variance were estimated, and the genetic values for resistance to bacterial spot predicted. Resistant seedlings were cultivated in the field for agronomic characters phenotyping. The average rank index was used to select promising offspring. The coefficient of additive genetic variation (12.97–32.57%) confirmed the existence of genetic variability in the population. The progeny-mean heritability was of high magnitude (80–97%), and narrow sense heritability had average magnitude (17–65%), which indicates desirable gains with the selection of individual plants. The accuracy of the selection was above 80% for all studied traits. The predicted genetic value for AUDPC was negative and the genetic gain was null; in contrast, for the IP variable and morphoagronomic characters, the predicted genetic gain was high. Thirty-three percent of promising segregation lines were selected, which should originate new pure line type sweet pepper cultivars resistant to BS.

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Data availability

The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request. Seeds are not publicly available until releasing new commercial genotypes.

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Acknowledgements

The authors acknowledge the financial support given by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), FAPERJ (Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro), and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico). We also thank the Graduate Program Science for Development (PGCD) and the Gulbenkian Institute of Science for granting the Ph. D. scholarship to the first author. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001.

Funding

This research was partially funded by FAPERJ, Grant Agreement Number: 202985/2017, and CNPq, Grant Agreement Number: 307569/2017-9.

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Correspondence to Rosana Rodrigues.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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da Graça, G.A., de Araújo, M.S.B., da Silva Alencar, A.A. et al. Associating REML/BLUP and pedigree in developing sweet pepper (Capsicum annuum L.) progenies resistant to bacterial spot. Euphytica 216, 119 (2020). https://doi.org/10.1007/s10681-020-02653-3

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  • DOI: https://doi.org/10.1007/s10681-020-02653-3

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