Phosphite effect on hot and sweet pepper reaction to Phytophthora capsici

Scientia Agricola

Fernando Cesar Sala²  Cyro Paulino Da Costa¹  Márcia De Moraes Echer¹  Marise Cagnin Martins¹  Sally Ferreira Blat² 

[1] ,USP ESALQ Programa de Pós-Graduação em Fitotecnia

关键词: Capsicum;    phosphorous acid;    resistance induction genetic;    pepper crown root rot;    Capsicum;    ácido fosforoso;    indução de resistência genética;    podridão de raízes do pimentão;   

DOI  :  10.1590/S0103-90162004000500005

来源: SciELO

【 摘 要 】

Phosphite has been recommended to enhance plant resistance against Phytophthora. This work evaluated the response of hot and sweet pepper (Capsicum annuum L.) to Phytophthora capsici from juvenile up to the adult stage following treatment with phosphite. Sweet pepper hybrids considered to be resistant to P. capsici, like Reinger, Nathalie and Athenas, were evaluated. The susceptible checks were hybrid Magali R and cvs. Myr 10 and Ikeda. Hot pepper Criollo de Morelos 328, CM 334, BGH 3756, BGH 5122, CNPH 294 and Locorte were used as referential resistant lines. Phosphite did not have an effect on the hot pepper resistant lines because of their genetic homozygozity, while no protection was observed for the Athenas hybrid claimed to be resistant. Heterozygous hybrids recognized as resistant, like Reinger and Nathalie, showed higher survival following phosphite treatment, and their reaction was equivalent to the resistant cvs. CM 328 and CM 334, except for the fruiting stage. Depending of the hybrid heterozygous genotype, phosphite possibly acts through indirect phytoalexin induction through the inhibited pathogen.

【 授权许可】

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