Novel sources of resistance to powdery mildew (Leveillula taurica (Lév.) Arnaud) in pepper

  • Ivan-Ilich MORALES-MANZO Universitat Politècnica de València, Instituto de Conservación y Mejora de la Agrodiversidad Valenciana (COMAV), Camino de Vera s/n, 46022, Valencia (ES)
  • Adrián RODRÍGUEZ-BURRUEZO Universitat Politècnica de València, Instituto de Conservación y Mejora de la Agrodiversidad Valenciana (COMAV), Camino de Vera s/n, 46022, Valencia (ES)
  • Marisa JIMÉNEZ-PÉREZ Universitat Politècnica de València, Instituto de Conservación y Mejora de la Agrodiversidad Valenciana (COMAV), Camino de Vera s/n, 46022, Valencia (ES)
  • Jose J. LUNA-RUIZ Universidad Autónoma de Aguascalientes (UAA), Centro de Ciencias Agropecuarias, Avenida Universidad 940, Aguascalientes, Aguascalientes 20100 (MX)
  • Alberto SAN-BAUTISTA Universitat Politècnica de València, Centro Valenciano de Estudios sobre Riego – Dep. Producción Vegetal, Camino de Vera s/n, 46022, Valencia (ES)
  • Ana FITA Universitat Politècnica de València, Instituto de Conservación y Mejora de la Agrodiversidad Valenciana (COMAV), Camino de Vera s/n, 46022, Valencia (ES)
Keywords: chiltepin, high tolerance, oidium, chlorosis, complex control resistance, screening


Peppers, a worldwide crop, are threatened by different pathogens. Powdery mildew, a biotroph fungal infection, can cause several damages directly on vegetative parts and indirectly on fruits. Despite some sources of resistance have been described, commercial genotypes only with partial resistance have been developed due to the complex nature of such resistance and variable genetic expression, which depends on the stage of the plants. In this paper 49 accessions from different Capsicum species and origins have been tested. Plants were grown in growth chambers inside of mini greenhouses. Repeated inoculations under pepper leaves were applied by spraying a suspension of 104 conidia ml-1. Readings were made at 30 and 60 days after inoculation (DAI). Total number of leaves (TL), total number of affected leaves (LA), and maximum area affected (MAA) in the most damaged leaf were scored. In addition, a composite infection index (CII) was calculated on the basis of the three mentioned traits. Inoculated plants showed more severe symptoms at 30 DAI than at 60 DAI. Different response patterns were observed: from accessions suffering high leaf shedding to some others with local hypersensitive response, indicating different gene action. The use of CII prevented species bias and disease response. In the present work, four highly tolerant accessions were identified, including two chiltepins, C. annuum wild relatives, Ag-01 and Ag-02, and two C. annuum A-06 and A-23.


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How to Cite
MORALES-MANZO, I.-I., RODRÍGUEZ-BURRUEZO, A., JIMÉNEZ-PÉREZ, M., LUNA-RUIZ, J. J., SAN-BAUTISTA, A., & FITA, A. (2021). Novel sources of resistance to powdery mildew (Leveillula taurica (Lév.) Arnaud) in pepper. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 49(2), 12354.
Research Articles
DOI: 10.15835/nbha49212354

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