Developing Wheats Resistant to Snow Mold in Washington State

Bruehl, G. W.

doi:10.1094/pd-66-1090

Cited by 62 publications

(89 citation statements)

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“…Kohn (Gaudet and Bhalla 1988). The prevalence and severity of the different snow mold species are influenced by the duration of snow cover and the average subniveal temperatures (Bruehl 1982;Gaudet et al 1989;Nissinen 1996).…”

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“…Even susceptible cultivars can develop substantial resistance to snow mold if growing conditions permit the development of many tillers and large crowns (Gaudet and Chen 1987;Gaudet and Kozub 1991;Nakajima and Abe 1996). In the Pacific Northwestern United States, the maximum expression of snow mold resistance is observed with early seeding, which permits the development of large plants with numerous tillers (Bruehl 1967(Bruehl , 1982. Bruehl (1967) demonstrated that the optimum date for planting winter wheat in this region was mid-to late August.…”

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Effect of plant age on water content in crowns of fall rye and winter wheat cultivars differing in snow mold resistance

Gaudet¹,

Laroche²,

Puchalski³

2001

Can. J. Plant Sci.

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. 2001. Effect of plant age on water content in crowns of fall rye and winter wheat cultivars differing in snow mold resistance. Can. J. Plant Sci. 81: 541-550. Resistance to snow molds in winter wheat increases with plant age, and older plants express higher levels of resistance than young plants. Experiments were conducted to study the effect of plant age on percent crown water content (%CWC) and dry weights in fall rye and winter wheat cultivars grown under controlled environments and in the field at Lethbridge, AB. Under controlled environments, the oldest (6 wk of pre-hardening growth at 20°C) treatments accumulated the greatest dry weights following exposure of plants to 1 to 6 wk hardening conditions at 2°C, compared with younger (1 to 4 wk pre-hardening growth) treatments. Exposure of plants to hardening temperatures had the greatest effect on %CWC values, which decreased, gradually, from 82-89% (4.95-8.67 g H 2 O g -1 DW) in unhardened treatments to 67-72% (2.05-2.65 g H 2 O g -1 DW) in plants receiving the 6 wk pre-hardening and 6 wk hardening growth. However, the oldest treatments (4 to 6 wk pre-hardening growth) always exhibited the lowest %CWC values among all hardening treatments. The %CWC in the oldest (6 wk) unhardened plants was also lower ( × = 80.8% or 4.24 g H 2 O g -1 DW) than in the youngest (1 wk) unhardened plants ( × = 91.2% or 11.31 g H 2 O g -1 DW ), demonstrating that water loss occurs in older plants in the absence of low hardening temperatures. In a field study at Lethbridge during the autumn, winter, and early spring of 1997-1998 and 1998-1999, different seeding dates were employed to obtain plants differing in age and developmental state. The %CWC in earlyseeded treatments was lower during the autumn, and remained lower in early spring, compared with later seeded cultivars. The %CWC in crowns was negatively associated with the snow mold resistance rating of a fall rye and five winter wheat cultivars under controlled environment conditions, and among a fall rye and 13 winter wheat cultivars in the field; the highest correlation values in the field were observed from mid-November to mid-March during 1997-1998 (r = -0.84), and 1998-1999 (r = -0.76). These results indicate that the type of snow mold resistance that increases with plant age is related to the accumulation of crown dry matter and the ability of wheat and rye plants to lose crown water in response to both extended growth at warm temperatures and hardening at low, above freezing temperatures. 541-550. Chez le blé d'hiver, la résistance à la moisissure des neiges s'accroît avec l'âge, si bien que les plants plus âgés y résistent mieux que les jeunes. Les auteurs ont étudié les effets de l'âge de la plante sur la concentration d'eau dans la couronne (% CEC) et sur le poids sec des cultivars de seigle d'automne et de blé d'hiver cultivés en milieu contrôlé et au champ à Lethbridge (Alberta). En milieu contrôlé, les traitements les plus longs (6 semaines de culture à 20°C) débouchent sur le poids sec le plus élevé après acc...

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confidence: 99%

Effect of plant age on water content in crowns of fall rye and winter wheat cultivars differing in snow mold resistance

Gaudet¹,

Laroche²,

Puchalski³

2001

Can. J. Plant Sci.

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“…Gaudet (1986 (Fowler and Gusta 1979) and snow mold resistance (Gaudet and Chen 1988) For personal use only. (Kiyomoto and Bruehl 1977;Bruehl 1982;Bengtsson 1989) and slower depletion of the carbohydrate through respiration throughout the winter (Kiyomoto 1987 (Gaudet 1986;Gaudet, unpublished …”

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“…Gaudet and Chen (1987) found that resistance increased to a maximum after 6 wk of prehardening growth at2O"C. The freezing resistance of winter wheat lines or the degree of hardening developed under controlled conditions were not directly related to level of resistance to LTB under controlled conditions (Gaudet andChen 1987. 1988 Mullerl also has been related to plant size but not to cold hardiness (Bruehl and Cunfer l97l;Bruehl 1982).…”

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Screening winter wheat for resistance to cottony snow mold under controlled conditions

Gaudet¹,

Kozub²

1991

Can. J. Plant Sci.

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“…Sources of speckled snow mould resistance have been reported (Amano and Ozeki 1981;Bruehl 1982) and such materials are available for use in winter wheat breeding programs.…”

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