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  • Author or Editor: A. G. Boomstra x
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Abstract

Susceptibility to root rot in beans Phaseolus vulgaris incited by Fusarium solani (Mart.) Appel & Wr. f.sp. phaseoli (Burk.) Snyd. & Hans, was dominant in crosses between resistant PI 203958 and susceptible cultivars ‘Cascade’, ‘Falcon’, ‘State Half Runner’ and ‘California Small White’. A quantitative inheritance pattern for disease reaction was observed. Selection of F2 plants showing slight disease symptoms resulted in F4 populations with a lower disease index than the unselected F2 population, indicating substantial gain. The results suggested that breeding methods such as recurrent selection, which are more suitable for improving quantitative traits than are backcrossing or pedigree selection, should be used to develop, Fusarium root rot resistant bean populations and cultivars.

Open Access

Abstract

A procedure using nutrient culture media was developed to screen bean seedlings on an individual plant basis for reaction to Fusarium solani (Mart.) Appel & Wr. f. sp. phaseoli (Burk.) Snyd. & Hans. From over 800 accessions, 18 plant introductions and several cultivars of Phaseolus vulgaris were found to be either resistant or tolerant. Susceptible plants, grown with ammonium nitrate as the nitrogen source (210 ppm N) showed reduced symptoms compared to plants grown on nitrate-N only. Ammonium as the sole nitrogen source was toxic to bean seedlings at identical nitrogen concentrations. Results based on the nutrient culture technique were generally consistent with field reactions.

Open Access