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Response of onion genotypes to Fusarium oxysporum f.sp. cepae during the growth phase and in storage.

Stadnik, M. J.; Dhingra, O. D.;

Fitopatologia Brasileira Year: 1996 Vol: 21 Issue: 4 Pages: 431-435 Ref: 16 ref.

1996

บทคัดย่อ

Response of onion genotypes to Fusarium oxysporum f.sp. cepae during the growth phase and in storage.

The response of 21 onion genotypes to F. oxysporum f.sp. cepae inoculated at the seedling stage was studied in the greenhouse. The roots of 60-d-old seedlings were inoculated by immersion in a spore suspension and the seedlings were planted in pots. Plant height and leaf number reduction were determined 15, 45 and 75 d after inoculation. Yield loss was determined at harvest and development of basal rot of bulbs was determined after 90 d in storage. The genotypes differed significantly in plant height up to 45 d, but later on all the plants recovered height and did not differ from healthy plants. Tolerance or resistance was determined by yield loss at harvest. Based on this criterion, the genotypes were classified as resistant (Bola Precoce, Roxa de Barreiro, Crioula, Texas Grano 502, Roxa IPA-3, Monte Alegre and Pera IPA-1), moderately resistant (Crioula x N.14, Pera IPA-6, Tupungato, Selecao Crioula, N.14, Rosada and Red Creole) and susceptible (Baia Dura AG-732, Baia Periforme, Piraporanga, Ba

ia Ouro AG-59, Roxa de Traviu and Super Precoce). However, all of the 20 genotypes were moderately susceptible or susceptible to basal rot in storage. Only 1 genotype, Cebola de Verao, showed resistance at all the stages of the crop cycle, including the storage basal rot. The populations of all the genotypes contained, in varying proportions, individual plants resistant to storage rot, as the stem plate of all the healthy looking bulbs was colonized by the pathogen.