RESISTANCE TO ALTERNARIA BROWN SPOT OF NEW CITRUS HYBRIDS

We suggested that due to a complete dominance for both gene pairs, only if both kinds of dominant alleles were present the susceptible phenotype appears

KELLY APARECIDA FERNANDES DE CAMPOS; FERNANDO ALVES DE AZEVEDO; MARINÊS BASTIANEL; MARIÂNGELA CRISTOFANI-YALY

2017

Scholarcy highlights

  • The main diseases that affect the Brazilian citrus industry include tristeza, citrus canker, citrus variegated chlorosis, leprosis and huanglongbing
  • With respect to mandarins we highlight alternaria brown spot, which is caused by Alternaria alternata f. sp. citri, that affects the main commercial varieties and their hybrids in the country, such as Ponkan mandarin and Murcott tangor
  • ABS was first identified in Australia in Emperor mandarin around 1903, and the disease soon spread to other places in the world; it is present in several countries, such as Turkey, Spain, Italy, South Africa, the USA, China, Brazil and Argentina
  • The toxin type ACT produced by A. alternata f. sp. citri is widely described in the literature and is specific to a particular host range, including mandarins and some hybrids
  • ABS constitutes the main disease of mandarins and their hybrids; the main varieties planted in orchards in the state of São Paulo, including Ponkan mandarin and Murcott tangor, are highly susceptible
  • 24 hours after the inoculation of detached leaves in vitro, leaf lesions were observed in 54 hybrids and in varieties used as positive controls, as expected
  • The frequency of segregation observed and high heritability suggest that few genes may be involved in controlling the inheritance of alternaria brown spot resistance in citrus

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