Germination and appressorium formation of wheat leaf rust on susceptible, partially resistant and resistant wheat seedlings and on seedlings of other Gramineae

Jacobs, Th.

doi:10.1007/bf01997473

Cited by 12 publications

(10 citation statements)

References 12 publications

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“…In the past, several research programs adopted microscopic observations to analyse the development of P. triticina in susceptible, partially resistant and resistant wheat cultivars, and contributed to the elucidation of some of the resistance mechanisms (Jacobs 1989;Martinez et al 2004;Poyntz and Hide 1987). In this context, it was shown that the hostpathogen interaction, which depends on the genotype of both plant and fungus, determines the resistance to a great extent (Bolton et al 2008;Kolmer 1997;McIntosh et al 1995;Rubiales and Niks 1995).…”

Section: Discussionmentioning

confidence: 96%

Quantum yield of non-regulated energy dissipation in PSII (Y(NO)) for early detection of leaf rust (Puccinia triticina) infection in susceptible and resistant wheat (Triticum aestivum L.) cultivars

2010

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The development and optimization of protocols for the precise and presymptomatic detection of diseases, and non-invasive evaluation of genotype-specific pathogen resistance enabling selection of the more promising genotypes in breeding programmes are important and often overlooked topics in precision agriculture. The increasing pressure to minimize both production costs and the environmental impact of pesticides forces the search for rapid and objective methods of screening pathogen resistance. Using the non-destructive pulse amplitude modulated (PAM) chlorophyll fluorescence imaging technique, we hypothesized that not only disease detection but also discrimination between differences in the level of resistance of wheat cultivars to the leaf rust (Puccinia triticina Erics.) pathogen can be achieved. Experiments were conducted using the cultivars Dekan and Retro as representatives of a susceptible and a highly resistant genotype, respectively. Fluorescence measurements were carried out daily on the control and on plants inoculated with P. triticina until the first small red-brown pustules appeared in the centre of chlorotic spots. In response to pathogen inoculation, the fluorescence readings showed an early characteristic increase in Y(NO) in both resistant and susceptible cultivars. The susceptible cultivar, however, showed a more pronounced difference between Y(NO) values measured on the control and inoculated leaves as well as a distinct evolution over time. Accordingly, our results indicate that Y(NO) might be suitable for discriminating between wheat genotypes as early as 2 days after inoculation. Thus, the proposed protocol might be adopted as an additional tool for the early screening of new genotypes, especially in breeding programs that aim for high resistance to disease and low crop variability for precision agriculture. However, its implementation in experimental field plots requires improvement of the measurement system and establishment of appropriate algorithms for disease pattern recognition and data analysis.

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Section: Discussionmentioning

confidence: 96%

Quantum yield of non-regulated energy dissipation in PSII (Y(NO)) for early detection of leaf rust (Puccinia triticina) infection in susceptible and resistant wheat (Triticum aestivum L.) cultivars

2010

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“…In an investigation on the germination and appressorium formation by P. recondita f.sp. tritici on different genotypes of host and non-hosts, Jacobs (1989a) indicated no measurable differences between hosts and non-hosts. However, a reduction in attempts at leaf penetration was found for cowpea rust on some non-host plants examined (Heath, 1974(Heath, : 1977 and was also reported for bean rust on cowpea and soybean (Wynn, 1976).…”

Section: Discussionmentioning

confidence: 97%

Development of Early Infection Structures of Puccinia recondita f. sp. tritici in Non‐host Cereal Species

Rukenberg

1998

Journal of Phytopathology

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The development of infection structures, derived from urediospores of Puccinia recondita f.sp. trilici in nearisogenic lines of susceptible and resistant wheat, and in non-hosts (viz. maize, oat, sorghum and barley), was examined by fluorescence microscopy and scanning electron microscopy (SEM). The infection structure formation on and in five cereal species follows a similar pattern. In sorghum, fungal development is arrested at the stage of substomatal vesicle formation, while, in maize, most fungal structures collapse during the stage of primary hypha development. By contrast, in wheat, barley and oat, the fungus forms many branched infection hyphae and haustorial mother cells.

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“…This is only a preliminary conclusion based on a limited number of accessions and species . Poor appressorium formation has not been found (Niks 1981 ;Jacobs 1989) or has only rarely been reported in cultivated cereals (Cobb 1892 ;Andreyev et al . 1987 ;Lanetskii et al ., 1988).…”

Section: Discussionmentioning

confidence: 99%

Avoidance of leaf rust fungi in wild relatives of cultivated cereals

1996

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Avoidance of rust fungi that was based on poor appressorium induction was previously found in Hordeum chilense . In the present study 95 accessions of Triticeae were screened for avoidance of Puccinia hordei. The percentage of appressorium formation per germinated spore ranged from 6 to 90% . On none of the 41 accessions of Aegilops, Agropyron, Elymus, Secale, Thinopyrum or Triticum studied was the rate of appressorium formation lower than 25% . Lower rates of appressorium formation were, however, found on accessions of wild barley species Hordeum brachyantherum, H. marinum, H. parodii and H. secalinum . Its implications in cereal breeding are discussed .

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Germination and appressorium formation of wheat leaf rust on susceptible, partially resistant and resistant wheat seedlings and on seedlings of other Gramineae

Cited by 12 publications

References 12 publications

Quantum yield of non-regulated energy dissipation in PSII (Y(NO)) for early detection of leaf rust (Puccinia triticina) infection in susceptible and resistant wheat (Triticum aestivum L.) cultivars

Quantum yield of non-regulated energy dissipation in PSII (Y(NO)) for early detection of leaf rust (Puccinia triticina) infection in susceptible and resistant wheat (Triticum aestivum L.) cultivars

Development of Early Infection Structures of Puccinia recondita f. sp. tritici in Non‐host Cereal Species

Avoidance of leaf rust fungi in wild relatives of cultivated cereals

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