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Web URL(s): | https://turf.rutgers.edu/research/abstracts/symposium2002.pdf#page=33 Last checked: 02/06/2017 Requires: PDF Reader Notes: Item is within a single large file |
Publication Type:
| Report |
Content Type: | Abstract or Summary only |
Author(s): | Bonos, S. A.;
Kubik, C.;
Han, Y.;
Clarke, B. B.;
Meyer, W. A. |
Author Affiliation: | Department of Plant Biology and Pathology, Rutgers University |
Title: | Heritability of gray leaf spot resistance in perennial ryegrass |
Section: | Poster presentations Other records with the "Poster presentations" Section
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Meeting Info.: | Cook College, Rutgers, NJ: January 10-11, 2002 |
Source: | Proceedings of the Eleventh Annual Rutgers TurfgrassSymposium. 2002, p. 32. |
Publishing Information: | New Brunswick, NJ: Center for Turfgrass Science, Cook College, Rutgers, The State University of New Jersey |
# of Pages: | 1 |
Keywords: | TIC Keywords: Cultivar evaluation; Disease resistance; Gray leaf spot; Heritability; Lolium perenne
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Abstract/Contents: | "Gray leaf spot caused by Pyricularia grisea (Cooke) Sacc. [perfect stage Magnaporthe grisea (T. T. Herbert) Yaegashi & Udagawa] has become a devastating disease of perennial ryegrass (Lolium perenne L.) turfs since its first identification in 1986 by Dr. Peter Dernoeden (Vermeulen, 1999). Genetic resistance is the most promising of the control strategies for gray leaf spot. However, the germplasm base for perennial ryegrass cultivars is narrow and little resistance has been observed (Vaiciunas and Clarke, 1998). The identification of gray leaf spot resistance can be used in recurrent selection techniques to incorporate genes for gray leaf spot resistance within the species improving the development of gray leaf spot resistant varieties. The objectives of the study was [were] to 1) evaluate cultivars, experimental selections and single-plot progenies of perennial ryegrass for resistance to gray leaf spot, 2) identify the response to selection for gray leaf spot resistance in perennial ryegrass populations; 3) determine realized heritability of gray leaf spot resistance and 4) identify genetic relationships of resistant and susceptible populations of perennial ryegrass. Two field trials were established in a randomized complete block design in August, 2000 and 2001, at the Plant Science Research Station, Adelphia, NJ. The outbreaks of gray leaf spot occurred naturally in both years on 17 September 2000 and 26 September 2001 on approximately four week old seedling turf. Gray leaf spot was rated using a 1-9 scale (9=no disease). Parents were selected for gray leaf spot resistance from data in 2000 and used to develop populations in 2001. Allelic data from 15 microsatellite loci was generated using PCR (Polymerase Chain Reaction) and sizes analyzed using ALF-express DNA sequencer (Pharmacia Biotech). All replicated data was subjected to analysis of variance. The selection differential, response from selection and realized heritability were calculated from the equation: Δμ or R=μo-μ = Β(μs-μ) = ΒS described in Lynch and Walsh (1998) where μo is the mean phenotype of the offspring of the selected parents, μs = the mean phenotypic value of selected parents, μ is = the phenotypic value of the parent population before selection was made, and Β = R/S or h2 or realized heritability. Variation in gray leaf spot resistance among cultivars and selections of perennial ryegrass was observed. Thirty-six experimental selections had better leaf spot resistance than all commercially available perennial ryegrass cultivars. Fifteen of the 36 sources of resistance were germplasm collections from Europe. Selection of resistant parents in 2000 resulted in improved resistance in 2001. The selection differential (S) = 2.22, and the realized heritability = 0.98 indicate that selection for gray leaf spot resistance should be very effective in improving gray leaf spot resistance in subsequent generations. Most population distributions approach a normal distribution, which would indicate a quantitative type of inheritance; however, major genes may still be present." |
Language: | English |
References: | 0 |
Note: | This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Bonos, S. A., C. Kubik, Y. Han, B. B. Clarke, and W. A. Meyer. 2002. Heritability of gray leaf spot resistance in perennial ryegrass. Proc. Annu. Rutgers Turfgrass Symp. p. 32. |
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| Web URL(s): https://turf.rutgers.edu/research/abstracts/symposium2002.pdf#page=33 Last checked: 02/06/2017 Requires: PDF Reader Notes: Item is within a single large file |
| MSU catalog number: SB 433 .R88 |
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