Response of barley hordeum vulgare genotypes to brown rust puccinia hordei with variation in temperature

Udeogalanya, A.C.C.

Indian Journal of Agricultural Sciences 59(11): 718-723


ISSN/ISBN: 0019-5022
Accession: 007750715

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Histological assessment of the reaction of 5 varieties of barley (Hordeum vulgare L. sensu lato) to infection of brown rust (Puccinia hordei Otth.) showed no significant differences between them for uredospore germination and subsequent leaf penetration. Resistance or susceptibility was found to be related to post-penetration development 96 hr after inoculation. The development of post-penetration stages of the fungus on 'Cebada Capa' and 'CI 1243' was temperature sensitive, whereas that of 'Estate', 'XEBDN 1265/70' and 'Midas' was not. The developmental time of P. hordei race F on 'CI 1243' increased with the length of time when the infected seedlings were kept at low temperature. The infected seedlings, transferred from low to high temperature before any infection symptoms appeared on them, proved susceptible. The seedlings transferred after the first signs of infection appeared were resistant.