Powdery mildew resistance in Kentucky bluegrass genotypes regenerated from excised seed pieces

Msikita, W.; Wilkinson, H. T.

doi:10.1007/bf00027518

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…var poae‐nemoralis (Otth.) and P. poarum (Vargas et al., 1981; Meyer, 1982; Msikita and Wilkinson, 1994). This was confirmed in this study by the fact that the average rust resistance score (3.9) of the 444 ecotypes tested was only a little lower than the same score for the eight cultivars used as control (4.5).…”

Section: Discussionmentioning

confidence: 99%

“…Breeding of new cultivars of Kentucky bluegrass using hybridization is much more common in the USA where, for 76 cultivars, 38% had originated from crosses (Alderson, 1993). Furthermore, attempts have been made to improve the breeding efficiency of grasses by using apomictic gene(s) (Naumova, 1997), intraspecific hybridization (Brittingham, 1941, 1943; Akerberg, 1942; Nygren, 1953; Clausen, 1961; Pepin and Funk, 1971; Dale et al., 1975; Meyer, 1982) or tissue culture (Msikita and Wilkinson, 1994).…”

Section: Introductionmentioning

confidence: 99%

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Preliminary Observations on Resistance to Rust Diseases of Kentucky Bluegrass Ecotypes from Poland

Czembor

Feuerstein

Żurek

2001

Journal of Phytopathology

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Four hundred and forty‐four ecotypes of Kentucky bluegrass (Poa pratensis L.) collected from Poland were screened for rust resistance. A field experiment was established at Hof Steimke, DSV (Deutschen Saatveredelung), Germany. The ecotypes originated from the Polish Gene Bank, IHAR – Botanical Garden, Bydgoszcz. Sixty‐two (13.9%) ecotypes that scored on average more than 5 were included in a group with high resistance. Ecotypes scored on average less than 5 were either included in a susceptible group (average scores 4.0–4.9) or a very susceptible group (average scores 2.0–3.9). There were 181 ecotypes in the susceptible group (40.8%) and 201 (45.3%) in the very susceptible group. Thirty‐three (7.4%) ecotypes were more resistant and 29 (6.5%) ecotypes had resistance on the level of the most resistant control variety Ottos (score of resistance 5.3). Eight ecotypes (1.8%) with the highest level of resistance (score 7 or higher) were identified as especially promising sources of rust resistance. One ecotype (141858) showed reaction type 9 in both years and another one (141903) showed reaction type 9 in one year and reaction type 8 in another year (mean 8.5). Six ecotypes were scored on average 7 or 7.5. For 17 different habitats from which the tested ecotypes were collected only those ecotypes originating from 10 habitats (meadow, peat meadow, forest meadow, pasture, field, lakeside, waterside, ditch, roadside and gravel pit) showed high levels of resistance to rust. The value of newly identified resistant ecotypes for control of rusts on Kentucky bluegrass is discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preliminary Observations on Resistance to Rust Diseases of Kentucky Bluegrass Ecotypes from Poland

Czembor

Feuerstein

Żurek

2001

Journal of Phytopathology

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“…Although the resistance we have reported is stable through successive vegetative clones, the heritability through seed has not been determined. Genetic traits, such as apomixis or outcrossing, make some crop species difficult to self-pollinate, thereby making it difficult to study inheritance of a trait in botanical seed (Msikita and Wilkinson, 1994;Skirvin et al, 1994). Tronchuda is an outcrossing crop, amenable to vegetative propagation (Msikita et al, 1992).…”

Section: Discussionmentioning

confidence: 99%

Variation for Black Rot Resistance in Tronchuda Regenerated from Epicotyl Segments

Msikita¹,

Wilkinson²,

Dias³

1995

HortSci

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Tronchuda (Brassica oleracea var. tronchuda Bailey syn. costata) regenerants with resistance to Xanthomonas campestris pathovar campestris Pammel (Dawson) were produced by culturing epicotyl segments of 3-week-old seedlings on Murashige and Skoog medium supplemented with 2 mg BAP and NAA at 0.1 mg·liter–1. Cultures were placed in darkness (1, 2, or 3 weeks) or in a 16-hour·day–1 light regime. Seedlings of all four cultivars were more susceptible (mean disease severity rating of 3.8 to 4.0; where 1 = trace and 4 = more than 2 cm2 diseased leaf tissue) than the respective regenerants. There were significant differences in disease severity of regenerants among and within the four cultivars. Dark incubation of cultured explants generated plants with higher disease resistance than evident with control plants. One week of dark incubation resulted in increased resistance in regenerants of `Penca de Chaves', `Portuguesa', and `Vilinda' (2.1, 2.3, and 2.7 mean disease severity, respectively), whereas 2 weeks of dark incubation increased resistance in regenerants of `Ana Maria' and `Vilinda' (2.1 and 2.7 mean disease severity, respectively). The genotype×plant treatment interaction was significant. Chemical names used: 6-benzylaminopurine (BAP); a-naphthaleneacetic acid (NAA).

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“…These changes in expression are generally not heritable, and are of little practical use in breeding specifically for disease resistance. Where such variation may be of value is in vegetatively propagated species, and stability of resistance to disease has been tested in a wide range of such species (Donovan et al ., 1994; Msikita & Wilkinson, 1994; Leal et al ., 1996; Ostry & Ward, 2003). However, most food crops are not produced vegetatively, and it is vital that variation to disease generated in these plants can be inherited in a stable way.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the response of carrot somaclones to Pythium violae, causal agent of cavity spot

et al. 2006

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Cavity spot is a major disease of carrots, causing cavities on the surface of the root. Available commercial varieties show a range of susceptibility but no significant resistance. Seed progeny from 46 tissue culture-derived carrot ( Daucus carota ) somaclones were screened for viability, then 19 selected somaclone families were sown under glasshouse conditions, along with commercial cultivars (Bertan, Nandor, Bolero and Vita Longa) as controls. Mature roots were exposed to Pythium violae in a cavity spot bioassay to determine their response as measured by disease incidence and severity. Some somaclones formed fewer lesions than the least susceptible control cultivar, Vita Longa. Seven somaclonal families that showed a range of susceptibility were sown under field conditions and the assessment was repeated. Although there was little relationship between glasshouse and field-trial results, under field conditions one of the somaclones had a mean incidence of disease, as estimated by transformed data, of 1·9 compared with 37·9 for the most susceptible somaclone and 3·5 for Bolero, the most resistant commercial cultivar. The results indicated that significant genetic variation in susceptibility to cavity spot disease was present in the somaclones.

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Powdery mildew resistance in Kentucky bluegrass genotypes regenerated from excised seed pieces

Cited by 5 publications

References 14 publications

Preliminary Observations on Resistance to Rust Diseases of Kentucky Bluegrass Ecotypes from Poland

Preliminary Observations on Resistance to Rust Diseases of Kentucky Bluegrass Ecotypes from Poland

Variation for Black Rot Resistance in Tronchuda Regenerated from Epicotyl Segments

Assessment of the response of carrot somaclones to Pythium violae, causal agent of cavity spot

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