Tiller and Rhizome Growth of Water-Stressed Poa pratensis 'Merion' Infected by Ustilago striiformis or Urocystis agropyri

Nus, Jeffrey L.; Hodges, Clinton F.

doi:10.1094/pd-74-0886

Cited by 14 publications

(16 citation statements)

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“…Overall, infected plants produced more primary and secondary stolons than disinfected plants, although this differed by population. These results contrast with findings from other studies, where stolon production was reduced in pathogen-infected plants (Nus & Hodges 1990;D'Hertefeldt & Van der Putten 1998;Piqueras 1999). These differences among plant-pathogen systems could be the result of variation in the specific interaction between plant and pathogen (Ahlholm et al 2002;Wille et al 2002).…”

Section: Discussion (A) Pathogen-induced Host Changescontrasting

confidence: 99%

“…These findings indicate that smut infection was not a significant resource drain on Glyceria and that the effects of Epichloë predominated. Other studies have also found minimal effects of U. striiformis on hosts under conditions where resources were not limiting (Hodges 1977;Nus & Hodges 1990). …”

Section: (B) Smut Infectionmentioning

confidence: 96%

“…Previous research has generally shown detrimental effects of pathogens on clonal growth (García-Guzmán & Burdon 1987;Nus & Hodges 1990;Wennströ m 1994;D'Hertefeldt & Van der Putten 1998;Piqueras 1999). For instance, Poa pratensis plants infected by Ustilago striiformis produced fewer rhizomes than uninfected plants (Nus & Hodges 1990). The fitness of systemic pathogens is particularly tied to their host plants because they are propagated along with the growth of their hosts.…”

Section: Introductionmentioning

confidence: 99%

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Infection by the systemic fungus Epichloë glyceriae alters clonal growth of its grass host, Glyceria striata

Pan

Clay

2003

Proc. R. Soc. Lond. B

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Parasites and pathogens are hypothesized to change host growth, reproduction and/or behaviour to increase their own transmission. However, studies which clearly demonstrate that parasites or pathogens are directly responsible for changes in hosts are lacking. We previously found that infection by the systemic fungus Epichloë glyceriae was associated with greater clonal growth by its host, Glyceria striata. Whether greater clonal growth resulted directly from pathogen infection or indirectly from increased likelihood of infection for host genotypes with greater clonal growth could not be determined because only naturally infected and uninfected plants were used. In this study, we decoupled infection and host genotype to evaluate the role of pathogen infection on host development and clonal growth. We found that total biomass production did not differ for clones of the same genotype, but infected clones allocated more biomass to clonal growth. Disinfected clones had more tillers and a greater proportion of their biomass in the mother ramet. Infected clones produced fewer tillers but significantly more and longer stolons than disinfected clones. These results support the hypothesis that pathogen infection directly alters host development. Parasite alteration of clonal growth patterns might be advantageous to the persistence and spread of host plants in some ecological conditions.

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Section: Discussion (A) Pathogen-induced Host Changescontrasting

confidence: 99%

Section: (B) Smut Infectionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Infection by the systemic fungus Epichloë glyceriae alters clonal growth of its grass host, Glyceria striata

Pan

Clay

2003

Proc. R. Soc. Lond. B

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“…1973), obUgately biotrophic pathogens have been found to reduce this ratio (Ayres, 1991;Paul, 1992). The unusual effect is possibly related to the fact that other systems have involved annual hosts, or rhizomatous perennial hosts such as Poa pratensis (Nus & Hodges, 1990). More probably, it is related to the ability of U. rumicis to cause abscission of leaves; this makes it unusual among rust fungi and more like necrotrophic fungi, which are known to cause increases in root weight ratio (Paul, 1992).…”

Section: S Ciis S I O Nmentioning

confidence: 99%

The effect of an insect herbivore and a rust fungus individually, and combined in sequence, on the growth of two Rumex species

et al. 1994

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SUMMARYThe chrysomelid beetle Gastrophysa viridula and tbe rust fungus Uromyces rumicis botb occur on leaves of Rumex crispus and R. obtusifolius. We mvestigated tbe effect of beetle grazmg or rust infection individually and wben combined in sequence on tbe growth of their bosts in tbe field. Singly, beetle or rust reduced leaf area and plant biomass; tbe effect was greater on R. crispus, and rust caused greater damage tban tbe beetle. Beetle grazing witb subsequent rust infection caused damage no greater tban that caused by rust alone, altbougb on R. obtusifolius damage was greater tban tbat from beetle grazing alone. Rust infection of R. obtusifotius witb subsequent beetle grazing produced damage similar to tbat from otber treatments involving rust infection. In R. crispus tbis treatment produced tbe greatest reduction in biomass. Tbe reductions in root and total plant weight from rust infection with subsequent beetle g-razing were accurately predicted by a model including the damage produced by beetle and rust alone and tbe length of time each was present on tbe plant. Tbis model also predicted accurately tbe damage to R. obtusifolius from the beetle followed by rust treatment, but oier-estimated by up to 4{)",, tbe damage to R. crispus. This can be explained mainiy by an inhibition of rust infection by beetle grazing.

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“…Clonal plants infected by parasites and pathogens also experience reduced growth, survivorship, and reproduction (Nus & Hodges, 1990;Frantzen, 1994;D'Hertefeldt & van der Putten, 1998;Piqueras, 1999, but see Wennström, 1994;Pan & Clay, 2002, 2003. However, how they affect the physiology of clonal plants is not well understood.…”

Section: Introductionmentioning

confidence: 99%

Epichloë glyceriae infection affects carbon translocation in the clonal grass Glyceria striata

Pan

Clay

2004

New Phytologist

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Summary• Systemic fungal endophytes derive resources from hosts and can affect host resource movement and integration. We examined whether infection by Epichloë glyceriae altered clonal growth of its host, Glyceria striata , through changes in physiology.• Growth of severed and intact stolons was compared to examine physiological integration in infected and disinfected (fungicide-treated) plants. To assess whether infection changed carbon (C) movement, labelling with 14 C was used.• We found physiological integration did not affect biomass per stolon for either infected or disinfected plants. The severed stolon to intact stolon ratio for the number of daughter ramets within a plant did not differ by infection status, although fewer daughter ramets were produced on severed stolons of disinfected plants. 14 C movement from the labelled leaf was greater for infected stolons, whereas the labelled leaf retained more assimilate for stolons of disinfected plants.• Previous studies showed that Epichloë glyceriae could increase host clonal growth. In this study, infection changed host assimilate distribution, but did not lead to corresponding differences in stolon growth. The effects of endophytes on host physiology and clonal growth may depend on environmental conditions.

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Tiller and Rhizome Growth of Water-Stressed Poa pratensis 'Merion' Infected by Ustilago striiformis or Urocystis agropyri

Cited by 14 publications

References 0 publications

Infection by the systemic fungus Epichloë glyceriae alters clonal growth of its grass host, Glyceria striata

Infection by the systemic fungus Epichloë glyceriae alters clonal growth of its grass host, Glyceria striata

The effect of an insect herbivore and a rust fungus individually, and combined in sequence, on the growth of two Rumex species

Epichloë glyceriae infection affects carbon translocation in the clonal grass Glyceria striata

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