Studies on Variation with Ophiobolus Graminis

Chambers, S C; Flentje, NT

doi:10.1071/bi9670941

Cited by 14 publications

(8 citation statements)

References 5 publications

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“…Previously, Chambers and Flentje (1967b) studied the survival of strongly and weakly pathogenic monosporous isolates from a perithecium formed in culture; they found that strongly pathogenic isolates survived well on straw buried in unsterilized soil, but weakly pathogenic variants did not. It, therefore, seems probable that weakly pathogenic variants arise in nature, but are unable to survive.…”

Section: Discussionmentioning

confidence: 99%

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Pathogenic Variation in Ophiobolus Graminis

Sc¹

1970

Aust. Jnl. Of Bio. Sci.

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Differences in pathogenicity of various Ophiobolus graminis isolates have been observed frequently (Davis 1925; Padwick 1936; Hynes 1937; White and McIntyre 1943; Henry and Gilpatrick 1947; Henry and McKenzie 1959). However, most workers give little or no information about the interval between isolation and testing of pathogenicity, although it is evident some isolates have been in culture for long periods. As virulence may vary considerably with repeated subculturing (Russell 1934, 1939), it is possible that some studies have been made with cultural variants which do not exist in nature. This communication, therefore, describes tests using the initial growth from fresh monosporous field isolates of O. graminis.

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Section: Discussionmentioning

confidence: 99%

“…(i) Isolates.-Details of the isolates used are given in Table 1. (ii) Method of Isolation.-Monosporous cultures were isolated by the technique of Chambers and Flentje (1967b). However, viable ascospores were obtained only from asci which discharged within 2 hr of being placed in water.…”

Section: Methodsmentioning

confidence: 99%

Pathogenic Variation in Ophiobolus Graminis

Sc¹

1970

Aust. Jnl. Of Bio. Sci.

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“…Garrett (1940Garrett ( , 1944 showed that amending the soil with inorganic nitrogen, or with nitrogen-rich organic matter, consistently prolonged survival in buried straw. This effect of nitrogen has been confirmed by Butler (1953Butler ( ,1959, Macer (1961) and Chambers & Flentje (1967). Garrett (1963Garrett ( , 1966Garrett ( , 1967 has recently discussed the mechanism of the effect, which results from the need for continued hyphal extension into fresh areas of substrate if maximum survival is to be achieved.…”

Section: Introductionmentioning

confidence: 74%

Effects of nitrogen and glucose on saprophytic survival of Ophiobolus graminis in buried straw

Scott¹

1969

Annals of Applied Biology

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SUMMARY Calcium nitrate prolonged the saprophytic survival of Ophiobolus graminis (Sacc.) Sacc. in artificially colonized straws buried in soil in the laboratory, whether supplied to the soil (at 12·5 or 100 mg nitrogen/100 g soil) or to the straws before colonization (at 0·5 or 1·0 g nitrogen/100 g straw). Glucose (at 2·5 g/100 g soil, and at 10 g/100 g straw) shortened survival. When straws colonized in the presence of 0·5 g nitrogen/100 g straw were buried in soil supplied with 14·1 mg nitrogen/100 g soil, the level of soluble soil nitrogen reached equilibrium at 2–4mg/100g soil; this allowed rapid straw decomposition and, although the added soil nitrogen prolonged survival in straws that remained undecomposed, it also accelerated substrate exhaustion. Addition of 100 mg nitrogen/100 g soil was supra‐optimal for survival: although some nitrogen was necessary for maximum survival, the equilibrium concentration of soluble nitrogen (24–56 mg/100 g soil) was high enough in this case to have an inhibitory effect in addition.

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“…A calcareous sandy soil from Moonta, S.A. (Chambers and Flentje 1967b) was used for laboratory studies. Field experiments were carried out in a red-brown earth of the Urrbrae series at the Waite Agricultural Research Institute, S.A., and a grey silaceous sand of the Caitup series at Esperance Research Station, W.A.…”

Section: (B) Soilsmentioning

confidence: 99%

Saprophytic Survival of Ophiobolus Graminis on Various Hosts

Chambers¹,

Flentje²

1968

Aust. Jnl. Of Bio. Sci.

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SummarySurvival of Ophiobolus graminis on artificially infected straw of several hosts was studied under field and laboratory conditions over a period of 24 weeks. Survival, estimated by percentage of straws containing viable hyphae of O. graminis, was greater on barley than on wheat, Hordeum leporinum, Lolium rigidum, and Vulpia myuros. Survival was higher under laboratory than summer field conditions, and in the field was greater at 1 than at 6 in. below the surface; survival was increased under laboratory conditions by nitrate enrichment of soil.In a field experiment, O. graminis was carried over at a high level on naturally infected Bromus gussonii, Hordeum hystrix, and H. leporinum, but not on Ehrharta calycina, L. rigidum, and V. myuros. Estimated yields of wheat sown after these grasses ranged from 18·8 to 4·0 bushels per acre for E. calycina and H. leporinum respectively.

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Studies on Variation with Ophiobolus Graminis

Cited by 14 publications

References 5 publications

Pathogenic Variation in Ophiobolus Graminis

Pathogenic Variation in Ophiobolus Graminis

Effects of nitrogen and glucose on saprophytic survival of Ophiobolus graminis in buried straw

Saprophytic Survival of Ophiobolus Graminis on Various Hosts

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