Infection efficiency of Phaeoisariopsis personata and the influence of different wetness patterns on germ-tube growth of the pathogen

    Wadia, K D R and Butler, D R (1994) Infection efficiency of Phaeoisariopsis personata and the influence of different wetness patterns on germ-tube growth of the pathogen. Plant Pathology, 43 (5). pp. 802-812. ISSN 1365-3059

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    Abstract

    Controlled environment studies with P. personata [Mycosphaerella berkeleyi], the causal agent of late leaf spot disease of groundnut, showed that infection is enhanced if leaves are exposed to alternate wet and dry periods (intermittent wetness) compared with continuous wetness. Detailed investigations to elucidate this phenomenon revealed more germ tubes per conidium and more branching of germ tubes with intermittent wetness than with continuous wetness. With intermittent wetness there was clear evidence of tropic growth of germ tubes and branches towards stomata and subsequent penetration. With continuous wetness, germ tube growth did not appear to be directional and germ tubes commonly passed over the stomatal guard cells, therefore leading to relatively few stomatal penetrations. For both wetness regimes, stomatal penetrations continued to increase with increased leaf wetness for at least 6 d after inoculation and there was a linear relationship between the number of stomatal penetrations and the number of resultant lesions. Infection efficiency was markedly increased when the spore load was reduced to 0.1 conidia/cm² (c. 1 spore/leaflet).

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Mandate crops > Groundnut
    Others > Plant Pathology
    Depositing User: Library ICRISAT
    Date Deposited: 27 Oct 2011 05:50
    Last Modified: 27 Oct 2011 05:50
    URI: http://oar.icrisat.org/id/eprint/2815
    Official URL: http://dx.doi.org/10.1111/j.1365-3059.1994.tb01624...
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: This paper is journal article no, 1563 of the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT),
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