Euphytica

, Volume 190, Issue 2, pp 169–180 | Cite as

Selection of watermelon genotypes for resistance to bacterial fruit blotch

  • Francisco C. Q. Carvalho
  • Liliana A. Santos
  • Rita C. S. Dias
  • Rosa L. R. Mariano
  • Elineide B. Souza
Article
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Abstract

Bacterial fruit blotch, caused by Acidovorax citrulli, is a serious threat to the watermelon crop in Brazil. To date, there are no disease-resistant varieties, thus requiring research seeking sources of resistance. To select genotypes with potential use in the management of fruit blotch, the resistance level of watermelon genotypes belonging to the Cucurbits Germplasm Active Bank for the Brazilian Northeast (Banco Ativo de Germoplasma de Cucurbitáceas para o Nordeste Brasileiro—BAG) of Embrapa Semiárido was evaluated at different plant developmental stages: seeds (74 genotypes), seedlings and plants before flowering (29 genotypes) as well as plants during flowering and fruiting (seven genotypes). The genotypes were evaluated for the incidence or severity of the disease, which was estimated with the aid of descriptive scales. Additionally, A. citrulli transmission was determined in seeds derived from symptomatic and asymptomatic fruits. No watermelon genotype was immune to fruit blotch, and the majority showed variations in resistance responses. However, the genotypes BGCIA 979, BGCIA 34 and Sugar Baby showed high levels of resistance at most stages of plant development, thereby suggesting that these genotypes possess fruit blotch resistance genes that could be used in breeding programs. Seeds from symptomatic and asymptomatic fruits of the seven tested genotypes showed transmission rates of A. citrulli up to 35.3 % and 8.7 %, respectively. These results confirm that asymptomatic fruits can harbor contaminated seeds that are responsible for the transmission of the bacteria.

Keywords

Acidovorax citrulli Citrullus lanatus Genetic resistance Pre-breeding Seed transmission 
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Notes

Acknowledgments

We thank the National Council for Scientific and Technological Development (CNPq), for the scholarships awarded to Francisco C. Q. Carvalho, Rosa L. R. Mariano and Elineide B. Souza.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Francisco C. Q. Carvalho
    • 1
  • Liliana A. Santos
    • 1
  • Rita C. S. Dias
    • 2
  • Rosa L. R. Mariano
    • 1
  • Elineide B. Souza
    • 1
  1. 1.Phytobacteriology Laboratory, Department of AgronomyUniversidade Federal Rural de PernambucoRecifeBrasil
  2. 2.Embrapa SemiáridoPetrolinaBrasil

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