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Resistance of some barley cultivars to leaf rust, Puccinia hordei; polygenic, partial resistance hidden by monogenic hypersensitivity

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Abstract

Three cultivars, all carrying the Pa7 gene for low infection type were crossed with ‘L94’, a cultivar assumed to carry no genes for partial resistance. The latent period (LP), the most important component determining partial resistance, was measured on 111 F2 plants not carrying the Pa7 gene and on four cultivars representing the known range in LP. Of 20 F3 lines the LP was evaluated, too. The F2 showed a continuous segregation for LP from nearly as short as ‘L94’ to as long as ‘Vada’. This was substantiated by the F3 data. The cultivars possessing the Pa7 gene are assumed to carry a series of minor genes, covered by Pa7, which govern a LP at least as long as that of ‘Vada’, a cultivar with a very high level of partial resistance and a long LP.

Samenvatting

Drie rassen, ‘Cebada Capa’, ‘Gonda’, en ‘La Estanzuela’, die het overgevoeligheidsgen Pa7 bevatten, werden gekruist met ‘L94’. Dit ras is buitengewoon vatbaar en bezit vermoedelijk geen genen voor partiële resistntie. De latentieperiode (LP), de belangrijkste component van partiële resistentie, werd gemeten op 111 F2 planten, die geen Pa7-gen bezaten, en op vier rassen, die de spreiding voor LP, voorzover bekend, vertegenwoordigden. Ook werd de LP gemeten aan 20 F3 lijnen. De verdeling van de F2 voor LP was continu en reikte van bijna even kort als die van ‘L94’ tot even lang als die van ‘Vada’ (Tabel 1). De F3 gegevens bevestigden dit (Tabel 2). De drie rassen met het Pa7-gen worden verondersteld een serie polygenen, overdekt door dit Pa7-gen, te bevatten, welke een LP geven even lang of zelfs langer dan de LP van ‘Vada’. Dit laatste ras heeft een zeer hoog niveau van partiële resistentie en een zeer lange LP.

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Author notes

  1. J. E. Parlevliet & H. J. Kuiper

    Present address: Department of Plant Breeding (IvP), Agricultural University, Lawickse Allee 166, Wageningen, the Netherlands

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    1. J. E. Parlevliet
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    2. H. J. Kuiper
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    Parlevliet, J.E., Kuiper, H.J. Resistance of some barley cultivars to leaf rust, Puccinia hordei; polygenic, partial resistance hidden by monogenic hypersensitivity. Netherlands Journal of Plant Pathology 83, 85–89 (1977). https://doi.org/10.1007/BF01989813

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