Pesquisa Agropecuária Brasileira (2009) 44, 1452-1459

Aliny Simony Ribeiro, José Francisco Ferraz de Toledo and Magno Antonio Patto Ramalho (2009)
Selection strategies of segregant soybean populations for resistance to Asian rust
Pesquisa Agropecuária Brasileira 44 (11), 1452-1459
Abstract: The objective of this work was to identify the best selection strategies for the more promising parental combinations to obtain lines with good resistance to soybean Asian rust (Phakopsora pachyrhizi). Two experiments were carried out in the field during the 2006/2007 and 2007/2008 growing seasons, to determine the percentage of infected leaf area of individual plants of five parents and their segregant F₂ and F₃ populations. The data obtained indicates that additive genetic variance predominates in the control of soybean resistance to Asian rust, and that the year and time of assessment do not significantly influence the estimates of the genetic parameters obtained. The narrow-sense heritability (h²_r) ranged from 23.12 to 55.83%, and indicates the possibility of successful selection of resistant individuals in the early generations of the breeding program. All the procedures used to select the most promising populations to generate superior inbred lines for resistance to P. pachyrhizi presented similar results and identified the BR01-18437 x BRS 232 population as the best for inbred line selection.
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Database assignments for author(s): Aliny Simony Ribeiro

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.
	Phakopsora pachyrhizi	Soybean (Glycine max)	Brazil (south)