CONSISTENCY OF REACTION IN WHEAT LINES TO COMMON ROOT ROT

Field trials distributed throughout the Prairie Provinces in western Canada indicate that any location is suitable for the selection of wheats for resistance to common root rot caused by Cochliobolus sativus, providing the level of infection is sufficiently high. Wheat lines originally selected for resistance were consistently resistant in field tests at all locations. Three of four lines were significantly more resistant than Thatcher, one of the most resistant of the commercial varieties. A high consistency in the reaction of lines selected for susceptibility also was evident in the tests. A significant interaction in the analysis of variance found between wheat lines and locations might be interpreted as indicating the occurrence of differentially pathogenic races of the fungus. Other explanations, however, are offered for this interaction effect.

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Lack of Relationship Between Susceptibility to Common Root Rot and Drought Tolerance Among Several Closely Related Wheat Lines

Plant Disease ◽

10.1094/pdis.2000.84.1.25 ◽

2000 ◽

Vol 84 (1) ◽

pp. 25-28 ◽

Cited By ~ 7

Author(s):

G. Piccinni ◽

C. M. Rush ◽

K. M. Vaughn ◽

M. D. Lazar

Keyword(s):

Drought Tolerance ◽

Root Rot ◽

Disease Incidence ◽

Bipolaris Sorokiniana ◽

Disease Index ◽

Grain Weight ◽

Common Root ◽

Plant Introductions ◽

Common Root Rot ◽

Wheat Lines

Common root rot caused by Bipolaris sorokiniana is a disease of wheat associated with plant stress. Three cultivars (Siouxland, TAM 200, and TAM 107) and several hard red winter wheat lines closely related to TAM 107, but known to differ with respect to drought tolerance, were included in a 2-year dryland field study to evaluate whether observed variation in drought tolerance was associated with susceptibility to B. sorokiniana. Untreated seed of each entry or seed treated with imazalil was planted in soil naturally infested with B. sorokiniana. Plants were evaluated at jointing and at harvest. Disease incidence and severity, number of plants, number of heads, and grain weight per meter were evaluated. Grain weight and number of heads of individual plants were recorded in order to correlate disease rating of each plant with yield components. Plot yield and test weight also were measured. There were significant entry by seed treatment interactions for number of heads per plant, grain weight per plant, and grain weight per meter. A year by treatment interaction was found for the jointing disease index, and plants grown from seed treated with imazalil had a significantly lower disease index than those grown from nontreated seed. Observed drought tolerance among the three varieties and eight closely related plant introductions was not associated with disease susceptibility to common root rot.

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The effects of fumigation, rotation with lupins, and nitrogen application on plant growth and common root rot of wheat at Geraldton, Western Australia

Australian Journal of Agricultural Research ◽

10.1071/ar9900619 ◽

1990 ◽

Vol 41 (4) ◽

pp. 619 ◽

Cited By ~ 5

Author(s):

JM Wilson ◽

J Hamblin

Keyword(s):

Grain Yield ◽

Root Rot ◽

Bipolaris Sorokiniana ◽

Field Trials ◽

Soil Fumigation ◽

N Fertilizer ◽

Soil Nitrate ◽

Nitrogen Application ◽

Common Root ◽

Common Root Rot

The effects of soil fumigation (98% methyl bromide + 2% chloropicrin at 580 kg/ha) and N fertilizer (0, 12.5, 25, 50 or 100 kg N/ha) were examined in field trials on continuous wheat and wheat in rotation with lupins on the Geraldton sandplain. Fumigation increased grain yields at N fertilizer levels more or =25 kg/ha and was associated with reduced incidence and severity of common root rot (Bipolaris sorokiniana)[Cochliobolus sativus]. Grain yield was not significantly affected by rotation. Fumigation increased soil ammonium levels and decreased soil nitrate levels. Rotation of wheat and lupins increased mid-season growth at all levels of applied N but only increased grain yield where no N was applied.

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EFFECT OF SEEDING DEPTH, SEEDING DATE AND SEED SIZE ON COMMON ROOT ROT OF SPRING BARLEY

Canadian Journal of Plant Science ◽

10.4141/cjps82-132 ◽

1982 ◽

Vol 62 (4) ◽

pp. 885-891 ◽

Cited By ~ 13

Author(s):

L. J. DUCZEK ◽

L. J. PIENING

Keyword(s):

Grain Yield ◽

Seed Size ◽

Root Rot ◽

Yield Loss ◽

Spring Barley ◽

Field Trials ◽

Common Root ◽

Common Root Rot ◽

Seeding Date ◽

Seeding Emergence

The effects of variable seeding depth and dates of seeding of barley on the incidence of root rot, and on emergence and grain yield were investigated in field trials at Saskatoon and Scott, Saskatchewan. The effect of variable seeding depth of barley on intensity of root rot, grain yield, loss of yield due to root rot, and the effect of variable seed size of barley on incidence of root rot and yield were also investigated in field trials at Lacombe, Alberta. Symptoms of common root rot, based on lesions on the subcrown internode, were not influenced by seed size or seeding date but the disease increased with depth of seeding. Grain yield decreased with depth and with late seeding. Emergence was not affected by seeding date but decreased with depth of seeding. Common root rot was not associated with the reduced yields of later seeding dates but was associated with reduced yields of increased seeding depths. The increased emergence and reduced disease at shallow depths resulted in a greater number of clean plants which probably accounts for some of the increased grain yield at shallow seeding depths.

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SCREENING WHEAT LINES FOR RESISTANCE TO COMMON ROOT ROT

Canadian Journal of Plant Science ◽

10.4141/cjps74-139 ◽

1974 ◽

Vol 54 (4) ◽

pp. 823-825 ◽

Cited By ~ 1

Author(s):

HOWARD HARDING

Keyword(s):

Root Rot ◽

Common Root ◽

Common Root Rot ◽

Wheat Lines

not available

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Linked morphological and molecular markers associated with common root rot reaction in barley

Canadian Journal of Plant Science ◽

10.4141/cjps96-148 ◽

1996 ◽

Vol 76 (4) ◽

pp. 879-883 ◽

Cited By ~ 5

Author(s):

H. R. Kutcher ◽

K. L. Bailey ◽

B. G. Rossnagel ◽

J. D. Franckowiak

Keyword(s):

Molecular Markers ◽

Root Rot ◽

Rapd Marker ◽

Cochliobolus Sativus ◽

Common Root ◽

Morphological Marker ◽

Common Root Rot ◽

Barley Germplasm ◽

Efficiency Of Selection ◽

Selection Of

Selection of common root rot [Cochliobolus sativus (Ito & Kurib.) Drechsl. ex Dastur] resistant barley germplasm is difficult due to the influence of environment on disease expression and the quantitative nature of resistance. Morphological and molecular markers associated with common root rot resistance could be used to increase the efficiency of selection of resistant germplasm and facilitate transfer to desirable barley genotypes Forty-five morphological marker sets consisting of four to six backcross-derived lines for each marker in a common background (cultivar Bowman) were planted in disease nurseries at two locations in each of 3 yr. Disease reactions of the back-cross-derived lines were tested for a difference from the disease reaction of Bowman, which indicated a putative association between the marker and common root rot reaction. An association was obtained between common root rot reaction and one set of backcross-derived lines that contained two linked markers: glossy-sheath (gs4) and orange lemma (o). A RAPD marker closely linked to gs4 and o was also associated with common root rot reaction. The RAPD marker was associated with the allele for resistance, while gs4 and o were associated with the allele for susceptibility. The RAPD marker would be most useful in the selection of common root rot resistant germplasm and the transfer of this resistance to other genotypes. Key words: Common root rot, Cochliobolus sativus, barley, morphological markers, molecular markers

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Assessment of tolerance in wheat and barley to common root rot (Cochliobolus sativus)

Canadian Journal of Plant Science ◽

10.4141/cjps93-157 ◽

1993 ◽

Vol 73 (4) ◽

pp. 1177-1187 ◽

Cited By ~ 1

Author(s):

L. J. Duczek ◽

G. B. Wildermuth

Keyword(s):

Grain Yield ◽

Root Rot ◽

Dry Matter ◽

Field Tests ◽

Cochliobolus Sativus ◽

Disease Assessment ◽

Growth Stages ◽

Common Root ◽

Common Root Rot ◽

The Relationship

Field tests at Saskatoon, Saskatchewan, Canada indicated no evidence of tolerance to common root rot in four spring wheat cultivars. There was a relationship between increased yield losses and increasing disease. In barley, the relationship was inconsistent in four cultivars and there was evidence of tolerance or recovery in Melvin with the number of seeds per head increasing with the level of disease. In Queensland, Australia there was evidence of tolerance in the wheat cultivar Banks across two locations, but the response was not consistent in all cultivars. Dry matter loss at immature growth stages was not related to grain yield loss. The inconsistent expression of tolerance in wheat, the difficulty of assessing it, and the difficulty of distinguishing tolerance from recovery suggest that the assessment of tolerance is not a reliable method of determining the reaction to common root rot. The relationship between loss in dry matter and grain yield, as disease increased, indicates that disease assessment should continue to be based on severity of symptoms. The evidence of tolerance to common root rot in barley suggests research on tolerance should concentrate on barley instead of wheat. Key words: Cochliobolus sativus, common root rot, tolerance, wheat, barley

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The effect of common root rot on the yield of resistant and susceptible wheat

Canadian Journal of Plant Science ◽

10.4141/cjps96-147 ◽

1996 ◽

Vol 76 (4) ◽

pp. 869-877 ◽

Cited By ~ 3

Author(s):

R. L. Conner ◽

G. C. Kozub ◽

K. L. Bailey

Keyword(s):

Disease Severity ◽

Root Rot ◽

Field Tests ◽

Cochliobolus Sativus ◽

Common Root ◽

Back Cross ◽

Common Root Rot ◽

The Impact ◽

Disease Free

The impact of common root rot, caused by Cochliobolus sativus, on the yield of mixtures of resistant and susceptible backcross-6 derivative lines of Neepawa and Chester wheat was examined in field tests at three locations between 1991 and 1994. Different blends consisting of all 25% incremental combinations of resistant and susceptible back-cross lines within each cultivar were evaluated for disease severity and yield at root rot nurseries and disease-free sites. Significant (P < 0.05) differences in yield were often detected among cultivars. However, within cultivars, no consistent yield differences were observed among blends of resistant and susceptible lines of the same cultivar regardless of root rot severity. Key words:Cochliobolus sativus, common root rot, yield, wheat

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VIRDEN BARLEY

Canadian Journal of Plant Science ◽

10.4141/cjps88-131 ◽

1988 ◽

Vol 68 (4) ◽

pp. 1111-1113

Author(s):

M. C. THERRIEN ◽

R. B. IRVINE ◽

K. W. CAMPBELL ◽

R. I. WOLFE

Keyword(s):

Hordeum Vulgare ◽

Root Rot ◽

Research Station ◽

Western Canada ◽

Net Blotch ◽

Common Root ◽

Hordeum Vulgare L ◽

Canadian Prairies ◽

Common Root Rot ◽

Moderately Resistant

Virden is a six-row feed barley (Hordeum vulgare L.) developed at the Agriculture Canada Research Station, Brandon, Manitoba, and is adapted to the western Canadian prairies. This cultivar is late maturing, strong strawed, mid-height to tall, with large, yellow-aleuroned kernels. Virden is resistant to common root rot and stem rust, and is moderately resistant to net blotch, false loose and covered smuts. There is an average 4% increase in yield when compared to Heartland, for all of western Canada, and an average 5 and 8% increase in yield when compared to Heartland and Bedford, respectively, for Manitoba.Key words: Barley (feed) cultivar, Hordeum vulgare

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Resistance to common root rot (Cochliobolur sativus) in wheat in Queensland

Australian Journal of Experimental Agriculture ◽

10.1071/ea9700497 ◽

1970 ◽

Vol 10 (45) ◽

pp. 497 ◽

Cited By ~ 5

Author(s):

GS Purss

Keyword(s):

Root Rot ◽

Field Resistance ◽

Gibberella Zeae ◽

Crown Rot ◽

Cochliobolus Sativus ◽

Individual Plant ◽

Common Root ◽

Plant Yield ◽

Common Root Rot ◽

Wheat Lines

The field resistance to common root rot (Cochliobolus sativus) of wheat lines, graded for their reaction to this disease in Canada, was determined under Queensland conditions. Several Australian varieties were also examined. Lines considered resistant and susceptible in Canada behaved in a similar fashion under Queensland conditions, while Australian varieties were generally intermediate. Discolouration of the sub-crown internode was the commonest symptom of the disease and was associated generally with a decrease in individual plant yield and in the number of heads on each plant. Discolouration of the sub-crown internode associated with Pyrenochaeta sp. in one experiment gave a varietal reaction pattern similar to that obtained with C. sativus at other sites. There appears little relationship between varietal reaction to common root rot and that previous1 reported to crown rot (Gibberella zeae).

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