Ultrastructural studies of interactions between resistant and susceptible poplar cultivars and the rusts,<i>Melampsora medusae</i>and<i>Melampsora larici-populina</i>

Spiers, A. G.; Hopcroft, D. H.

doi:10.1080/0028825x.1990.10412314

Cited by 6 publications

(2 citation statements)

References 15 publications

(17 reference statements)

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“…This type of reaction was similar to that expressed by leaf cells of poplar and tobacco following exposure to Pseudomonas syringae pv. syringae (Spiers et al 1989) and also leaf cells and haustoria of Melampsora medusae and M. larici-populina in poplar (Spiers & Hopcroft 1990). Similar effects were observed in cells of sugar beet and Japanese pear exposed to Cercospora beticola (Steinkamp et al 1981) and Alternaria kikuchiana (Park 1977a,b) respectively, both of which produce toxins which act on plasma membranes.…”

Section: Discussionsupporting

confidence: 57%

Biocontrol ofPhytophthora cactorumin vitro withEnterobacter aerogenes

Brewster

Spiers

Hopcroft

1997

New Zealand Journal of Crop and Horticultural Science

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Phytophthora cactorum causes significant mortality of mature trees in New Zealand pipfruit orchards. Replants of infected sites often succumb to this pathogen within 3 years. Enterobacter aerogenes, strain B8 was reported to control P. cactorum infection of apples in nursery soils in British Columbia. This strain was imported to New Zealand in 1991 and compared with indigenous isolates of E. aerogenes. The Canadian isolate differed from New Zealand isolates in utilisation of tartrate, tolerance of NaCl (5 cf. 7%), and inhibition of P. cactorum in vitro. Strain B8 was fungicidal whereas New Zealand isolates were fungistatic. Electron microscopy of mycelium exposed to strain B8 on agar revealed extensive disruption of cell membranes, intermixing and aggregation of organelles, necrosis, vacuolation, breakdown of the cell wall, and hyphal death. Hyphae exposed to New Zealand isolates of E. aerogenes exhibited vacuolation of the outer cytoplasm and degradation of the cell wall and plasmalemma but not cell degradation and death.

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Section: Discussionsupporting

confidence: 57%

Biocontrol ofPhytophthora cactorumin vitro withEnterobacter aerogenes

Brewster

Spiers

Hopcroft

1997

New Zealand Journal of Crop and Horticultural Science

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“…It is worth noting that the monokaryotic prepenetration phase terminates when the intraepidermal infection hypha is produced, whereas, for dikaryotic indirectly penetrating sporelings, the prepenetration phase extends to the intercellular mycelium in the substomatal chamber as far as the first haustorium mother cell. Thus, all the incompatible reactions reported for some dikaryotic rust sporelings at various stages during their prepenetration phase (BRUZZESE and HAsoN 1986;JAcoBs 1990;SPIERS and HoPCROFT 1990;Figs. 35, 36. -Early symptoms of rust infection on P. sylvestris shoots 7 days after inoculation with M. pinitorqua (Fig.…”

Section: Discussionmentioning

confidence: 92%

Morphological aspects of early host-parasite interactions in infections ofMelampsora pinitorquaandMelampsora larici-tremulaeonPinus sylvestris.Implications in the taxonomical relationship of the two rust fungi

Longo

Naldini²,

Paolillo

et al. 1997

Caryologia

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A cyto-histological study was carried out on Pinus sylvestris seedlings artificially infected with basidiospores of Melampsora pinitorqua and Melampsora laricitremulae, in order to differentiate between the two rust fungi and delineate their taxonomical relationships. The general morphology of the early phases of the majority of infections of Melampsora larici-tremulae on P. sylvestris show similar characteristics to those of M. pinitorqua. Moreover, in M. larici-tremulae / P. sylvestris interactions, the following were the specific characteristics: abnormal germlings and secondary basidiospore production, «cell wall-like appositions» encasing the fungal structures in the host, necrosis of the infection structures, necrosis of the host tissue colonized by mycelium from epidermal to parenchymal cells. Such reaction types reveal the coexistence of pre-and posthaustorial defence mechanisms, typical, respectively, of a nonhost and host resistance. This coexistence which is useful in understanding the evolution of this host-rust interaction, was examined. The described defence mechanisms of P. sylvestris vs. M. larici-tremulae could indicate that the two rust fungi are still closely related entities, however diverging, which evolve from «formae speciales» to «species».

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Comparative studies of the poplar rusts Melampsora medusae, M. larici-populina and their interspecific hybrid M.medusae-populina

Spiers

Hopcroft

1994

Mycological Research

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Ultrastructural studies of interactions between resistant and susceptible poplar cultivars and the rusts,Melampsora medusaeandMelampsora larici-populina

Cited by 6 publications

References 15 publications

Biocontrol ofPhytophthora cactorumin vitro withEnterobacter aerogenes

Biocontrol ofPhytophthora cactorumin vitro withEnterobacter aerogenes

Morphological aspects of early host-parasite interactions in infections ofMelampsora pinitorquaandMelampsora larici-tremulaeonPinus sylvestris.Implications in the taxonomical relationship of the two rust fungi

Comparative studies of the poplar rusts Melampsora medusae, M. larici-populina and their interspecific hybrid M.medusae-populina

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