Ultrastructural changes in chloroplasts of Populus tremula L., leaves affected by the fungus Melampsora pinitorqua Braun. Rostr

Młodzianowski, Fortunat; Siwecki, R.

doi:10.1016/0048-4059(75)90098-3

Cited by 12 publications

(4 citation statements)

References 12 publications

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“…In contrast, we did not observe any conspicuous anatomical alteration and physiological response in control experiments or when the plants were inoculated with the strain M11 (Figure 1, T1 and Figure 4). We have also found other features such as starch accumulation in mesophyll cells and chloroplast alterations normally associated with a defense response (Heath, 1974;Mlodzianowski and Siwecki, 1975), observed only in the incompatible interaction with F7 (results not shown). Figure 1 shows that when plants are exposed to F7, the disease symptoms produced by M11 decrease as the time between the first (with F7) and the second (with M11) inoculations increase, yielding complete plant protection when the time between inoculations is 96 h or more (Figure 1, T5-T7).…”

Section: Discussionmentioning

confidence: 76%

Induction of a defense response in strawberry mediated by an avirulent strain of Colletotrichum

et al. 2006

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In the strawberry crop area of Tucuma´n (north-west Argentina) the three species of Colletotrichum causing anthracnose disease (C. acutatum, C. fragariae and C. gloeosporioides) were detected. Among all isolates characterized, one of them identified as C. acutatum (M11) and another as C. fragariae (F7) were selected due to their conspicuous interaction with the strawberry cultivar Pa´jaro. Whereas isolate M11 produced a strong compatible interaction in cv. Pa´jaro with clear disease symptoms (DSR = 5.0), the isolate F7 brought about a typical incompatible interaction (DSR = 1.0). When plants of cv. Pa´jaro were inoculated with F7 prior to the inoculation with M11, the former avirulent strain prevented the growth of the latter virulent pathogen. Experimental evidence indicated that the time elapsed between the first inoculation with the avirulent pathogen and the second inoculation with the virulent one was crucial to inhibit the growth of the latter. The growth of F7 on the plant without provoking damage and the fact that there was no in vitro antagonistic effect between the pathogens, suggests that the avirulent strain triggers a plant defensive response against M11. The defense response was further confirmed by the detection of an early oxidative burst occurring within 4 h after the first inoculation and by the observation of anatomical changes associated with defense mechanisms that lasted 50 days after the inoculation with F7. Results obtained support the hypothesis that the plant resistance against the virulent strain M11 is elicited by one or more diffusible(s) compound(s) produced by the avirulent strain F7.

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Section: Discussionmentioning

confidence: 76%

Induction of a defense response in strawberry mediated by an avirulent strain of Colletotrichum

et al. 2006

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“…Mlodzianowski & Siwecki (1975) described ultrastructural changes in chloroplasts of Populus tremula infected with M. pinitorqua. Rijkenberg (1972) described the ultrastructure of urediniospores, germtubes, and haustoria of M.…”

Section: Discussionmentioning

confidence: 99%

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

Spiers¹,

Hopcroft

1990

New Zealand Journal of Botany

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Ultrastructural studies were conducted on poplar leaves from the field naturally infected with rust (Melampsora larici-populina.Melampsora medusae) exhibiting chlorotic flecking, necrotic spotting, necrotic and healthy uredinia. Elements of resistance or host defence mechanisms, namely collars, wall outgrowths, encasements, condensation and vacuolation of cytoplasm, disappearance and breakdown of organelles, and cell necrosis were exhibited by both resistant and susceptible cultivars, the difference being the extent to which each factor was expressed. Individual infections occasionally elicited different responses within the same host, highlighting inoculum diversity. The pathogenesis of M. larici-populina and M. medusae to their respective hosts was essentially similar.

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“…Ultrastructural changes in chloroplasts associated with this lesion type are similar to those reported in Coleus, tomato, maize and apples after microbial infection (Marty, 1976;Chevalier, 1991). The increase in the size and number of plastoglobi found in flecking lesions has also been reported in plant species other than V faba such as lettuce, iris and aspen (Delon and Mangenot, 1975;Mlodzianowski and Siwecki, 1975;Delon et al, 1977). Cooper (1981) stated that such ultrastructural changes were compatible with an acceleration of normal senescence.…”

Section: Introductionmentioning

confidence: 79%

Histopathology of the interaction between Ascochyta fabae and Vicia faba: comparison of susceptible and resistant reactions

1993

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Ultrastructural changes in chloroplasts of Populus tremula L., leaves affected by the fungus Melampsora pinitorqua Braun. Rostr

Cited by 12 publications

References 12 publications

Induction of a defense response in strawberry mediated by an avirulent strain of Colletotrichum

Induction of a defense response in strawberry mediated by an avirulent strain of Colletotrichum

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

Histopathology of the interaction between Ascochyta fabae and Vicia faba: comparison of susceptible and resistant reactions

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