Seasonal variation in the components of partial resistance of seedlings of winter wheat cultivars maris huntsman and maris ranger to septoria nodorum

Jeger, M.J.; Griffiths, E.; Jones, D.G.

Plant Pathology 32(2): 187-196

1983


ISSN/ISBN: 0032-0862
DOI: 10.1111/j.1365-3059.1983.tb01318.x
Accession: 006374397

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Abstract
Components of partial resistance of 2 winter wheat cultivars, Maris Huntsman and Maris Ranger, to S. nodorum were measured on potted seedlings exposed in the open during the spring and early summer of 1978. The number of lesions 10 days after inoculation was always greater for 'Maris Ranger' than for 'Maris Huntsman' but the relative differences changed during the season: about 10:1 in March, April and May, but only 3:1 in June. The time from infection to 1st sporulation (latent period) on 'Maris Ranger' was always shorter, especially in March. The percentage leaf area covered by lesions at the end of the latent period was usually greater on 'Maris Ranger', but variation in the percentage leaf area necrotic at this time did not follow a distinct seasonal trend, nor did cultivars differ in this respect. Twice as many spores per unit area diseased were produced on 'Maris Ranger' as on 'Maris Huntsman'. Seasonal variation in these components could partially be interpreted in terms of the changing weather conditions to which the plants were exposed.

Seasonal variation in the components of partial resistance of seedlings of winter wheat cultivars maris huntsman and maris ranger to septoria nodorum