Interactions of<i>Puccinia striiformis</i>and<i>Mycosphaerella graminicola</i>on Wheat

Madariaga, Ricardo

doi:10.1094/pd-70-651

Cited by 9 publications

(7 citation statements)

References 1 publication

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“…As diseases and pests in wheat most often coexist and interact, a multi-disease approach is essential (Kranz, 2005), although the focus must remain on the LBDs. The positive correlation between yellow rust and LBDs found in this study is not in agreement with glasshouse studies where rust development was repressed by the Septoria tritici blotch (Madariaga & Scharen, 1986). Powdery mildew has been reported to predispose plants to Septoria tritici infection (Brokenshire, 1974), which might explain the significantly positive correlation between these diseases in this study.…”

Section: Discussioncontrasting

confidence: 89%

Yield and disease control in winter wheat in southern Sweden during 1977–2005

Wiik¹

2009

Crop Protection

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Fungicides are routinely used to prevent yield losses in winter wheat in southern Sweden. Yield and 1000 grain weight (TGW) data from 432 trials in farmers' fields were evaluated to review long-term yields (1977-2005) and control of eyespot and Leaf Blotch Diseases (LBDs, including Septoria tritici blotch, Stagonospora nodorum blotch and tan spot), powdery mildew, brown rust and yellow rust. Regression analyses revealed that control of LBDs explained 74% of the yield increase achieved by fungicide treatment at GS 45-61, followed by powdery mildew (20%), brown rust (5%) and yellow rust (1%). Yield of both untreated and fungicide-treated plots increased from approx. 6000 to 12000 kg ha-1 over the period 1983-2005. Single eyespot treatment improved yield by ~320 kg ha-1 yr-1 during the period 1977-2002, mainly due to occasional years with severe eyespot. Single leaf disease treatment at GS 45-61 increased mean yield by 10.3% or 810 kg ha-1 yr-1 (9.9% or 660 kg ha-1 yr-1 for 1983-1994 and 10.7% or 970 kg ha-1 yr-1 for 1995-2005) due to increased TGW and grain numbers, especially in high yielding stands. Additional extra early treatment at GS 30-40 against LBDs increased yield by ~250 kg ha-1 yr-1. Estimated variance in yield and TGW was higher between years than within years, while that in yield increase and plant diseases was lower between years than within. The results confirm potential and limits of fungicides and the need for supervised control strategies including factors affecting disease, yield and interactions.

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Section: Discussioncontrasting

confidence: 89%

Yield and disease control in winter wheat in southern Sweden during 1977–2005

Wiik¹

2009

Crop Protection

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“…The ability of Bgt to form appressoria and haustoria and to produce secondary hyphae despite the inhibition of later development by pre-inoculation with virulent Z. tritici contrasts with the interaction between Z. tritici and P. striiformis . In the latter case, germination of urediniospores was reduced by the presence of Z. tritici and rust development was restricted to areas of the leaf not infected by Z. tritici ( Madariaga and Scharen, 1986 ), suggesting the rust pathogen could not compete for resources in the face of Z. tritici infection.…”

Section: Discussionmentioning

confidence: 99%

“…The non-biotrophic fungus Parastagonospora nodorum reduced the disease severity of powdery mildew ( Blumeria graminis ) although the presence of B. graminis increased the accumulated disease severity caused by P. nodurum ( Weber et al, 1994 ). In a glasshouse trial, the non-biotrophic fungal pathogen Zymoseptoria tritici reduced the incidence of Puccinia striiformis , thought to be due to competition between the two pathogens ( Madariaga and Scharen, 1986 ). Under controlled conditions, Lyngkjær and Carver (1999) found that an initial successful infection by a virulent isolate of B. graminis can render cells accessible to future attacks by other, normally avirulent isolates of this fungus but equally, inaccessibility to future infection could be induced if the initial attack failed.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Growth and Reproduction of the Biotrophic Fungus Blumeria graminis in the Presence of a Necrotrophic Pathogen

Orton

Brown

2016

Front. Plant Sci.

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Crops are attacked by many potential pathogens with differing life-history traits, which raises the question of whether or not the outcome of infection by one pathogen may be modulated by a change in the host environment brought on by infection by another pathogen. We investigated the host-mediated interaction between the biotroph Blumeria graminis f.sp. tritici (Bgt), the powdery mildew pathogen of wheat, and the necrotroph Zymoseptoria tritici, which has a long latent, endophytic phase following which it switches to a necrotrophic phase, resulting in the disease symptoms of Septoria tritici blotch. Both diseases are potentially severe in humid temperate climates and are controlled by fungicides and by growing wheat varieties with partial resistance. The compatible interaction between Z. tritici and the host reduced the number, size, and reproductive capacity of mildew colonies that a normally virulent Bgt isolate would produce but did not significantly alter the early development of Bgt on the leaf. The effect on virulent Bgt was elicited only by viable spores of Z. tritici. Notably, this effect was seen before the necrotic foliar symptoms induced by Z. tritici were visible, which implies there is a physiological interaction during the latent, endophytic period of Z. tritici, which either takes place directly between this fungus and Bgt or is mediated by the wheat leaf. Information on how different pathogens interact in host plants may allow plant breeders and others to improve the design of screening trials and selection of germplasm.

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“…Thetotal LAS on thèse plants were similar or smaller than those affected by each pathogen separately. on barley and other cereal crops (da Luz and Bergstom 1987;Madariaga and Scharen 1986;Pauvert et al 1978;Simkin and Wheeler 1974;Spadafora and Cole 1987), no study has been done on factors affecting their interactions. It seems possible that certain biotic and abiotic factors may affect the expression of any possible interactions among the pathogenic organisms.…”

Section: Effects Of Inoculum Concentration Wetting Period and Incubamentioning

confidence: 99%

Evaluation of interactions between Rhynchosporium secalis and Pyrenophora teres on barley

Xue¹,

Burnett²

2005

phyto

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Les interactions entre le Rhynchosporiumsecalis et le Pyrenophora teres ont été étudiées sur des plantules d'orge (Hordeum vulgare) cultivées dans une serre et dans des chambres de croissance. À la suite d'inoculations mixtes, les deux agents pathogènes ont colonisé la même feuilles imultanément, mais la surface foliaire portant des symptômes était moindre que celle produite par l'un ou l'autre des deux agents pathogènes utilisés seuls à la même concentration d'inoculum. Sur les plantes inoculées avec les inoculums mixtes, la surface foliaire portant des symptômes induits par le R. secalis était grandement inférieure à celle induite par le P. teres. La prédominance du P. teres sur le R. secalis a même été observée quand les inoculations avec le R. secalis précédait ou suivait l'inoculation avec le P. teres par 24 h. Un antagonisme s'est produit quand les concentrations d'inoculum étaient de 103-104 spores mL-1 pour chaque agent pathogène, avec les durées d'humectation de 24-48 h et une température d'incubation supérieure à 12°C.Interactions between Rhynchosporiumsecalis and Pyrenophora teres were investigated on barley (Hordeum vulgare) seedlings grown in a greenhouse and growth chambers. Following mixed inoculations, the two pathogens colonized the same leaf simultaneously, but the leaf area with symptoms (LAS) was less than that produced by either of the two pathogens alone at the same inoculum concentration. On plants inoculated with the mixed inocula, LAS induced by R. secalis was reduced by a greater amount than LAS induced by P. teres. The predominance of P. teres over R. secaliswas observed even when inoculations with R. secalis either preceded or followed the inoculation with P. teres by 24 h. Antagonism occurred when inoculum densities were 103-104 spores mL-1 for each pathogen, wetting periods were 24-28 h, and incubation temperature was above 12°C

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Interactions ofPuccinia striiformisandMycosphaerella graminicolaon Wheat

Cited by 9 publications

References 1 publication

Yield and disease control in winter wheat in southern Sweden during 1977–2005

Yield and disease control in winter wheat in southern Sweden during 1977–2005

Reduction of Growth and Reproduction of the Biotrophic Fungus Blumeria graminis in the Presence of a Necrotrophic Pathogen

Evaluation of interactions between Rhynchosporium secalis and Pyrenophora teres on barley

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