Fitopatologia Brasileira (2003) 28, 420-423

Edivaldo Cia, Milton G. Fuzatto, Julio Isao Kondo, Imre L. Gridi-Papp, Ederaldo J. Chiavegato and Maria A. Pizzinatto (2003)
Desenvolvimento de resistência múltipla a doenças em linhagens avançadas de algodoeiro
[Development of multiple resistance to diseases in advanced lineages of cotton]
Fitopatologia Brasileira 28 (4), 420-423
Abstract: After 15 years of studies concerning the development of multiple resistance to five major diseases of cotton (Gossypium hirsutum) - Fusarium and Verticillium wilts, bacterial blight, ramulosis, and nematodes - in advanced lineages arising from the normal breeding program conduced in the State of Sao Paulo, Brazil, by Instituto Agronômico (IAC), it was revealed an accumulative process whose results were agronomically relevant. Based on an interactive scheme involving the selection of lineages exhibiting resistance to one or more of the considered diseases and posterior reselection within them, the process was shown to effectively exploit natural genetic variability existing in cotton genotypes stabilized for other agronomic and industrial traits. Tendency to the establishment of the positive correlation was observed only in the case of resistance to bacterial blight and nematodes. Otherwise, persistence of negative correlations, mainly resistance to nematodes x ramulosis and ramulosis x bacterial blight, even in the more resistant materials, indicated the possibility of resistance losses for certain diseases if excessive selection pressures are exerted for others.
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(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Verticillium dahliae	Cotton (Gossypium)	Brazil (south)
	Xanthomonas citri subsp. malvacearum	Cotton (Gossypium)	Brazil (south)
	Fusarium gossypinum	Cotton (Gossypium)	Brazil (south)
	Colletotrichum gossypii	Cotton (Gossypium)	Brazil (south)