Assessment of genetic diversity in Italian rice germplasm related to agronomic traits and blast resistance (Magnaporthe oryzae)

Faivre‐Rampant, Odile; Bruschi, Gianluca; Abbruscato, Pamela; Cavigiolo, Stefano; Picco, Anna Maria; Borgo, Laetitia; Lupotto, Elisabetta; Piffanelli, Pietro

doi:10.1007/s11032-010-9426-0

Cited by 48 publications

(69 citation statements)

References 25 publications

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“…Arsenal, Atlantis and Libero resulted resistant in our test, instead of Augusto, which appeared to be MS (33 % of infected panicles). Moreover, Faivre-Rampant et al (2011) tested the resistance of several varieties to leaf-blast using nursery method and artificial inoculation with three isolates representative of the three lineages of M. oryzae reported in Italy (Roumen et al 1997). For varieties tested in both this study and Faivre-Rampant et al trials there's generally a good correspondence, despite the different method of resistance class assignment.…”

Section: Discussionmentioning

confidence: 99%

“…This can be due to different factors. First, one of the main goals in Italian rice breeding has always been to select varieties with genetic resistance to neck blast disease; second, after 1990 in Italy were introduced varieties from the US with good blast disease resistance, that were integrated in rice breeding programs (Faivre-Rampant et al 2011); third, cultivars registered in National list in 1967 (the year of constitution of the official National list) were actually selected between 1920 and 1940 (Tamborini et al 2008) and in almost a century of cultivation the pathogen could have overcome host resistance. Moreover, the ability of the fungus to mutate and quickly overcome host resistances is well known and is a major problem for rice breeders (Bonman 1992;Araujo et al 2000;Conaway-Bormans et al 2003;Faivre-Rampant et al 2011).…”

Section: Discussionmentioning

confidence: 99%

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Resistance to neck blast caused by Pyricularia oryzae in Italian rice cultivars

2015

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Very little information is available on neck blast resistance in Italian rice varieties under field conditions. In order to provide these data, 105 cultivars were tested under very favourable conditions for the disease development; the cultivars' response to a single treatment of tricyclazole was also evaluated. Among tested varieties, 15 % showed resistance to the disease, 17 % moderate resistance, 30 % moderate susceptibility and 38 % susceptibility. Generally, recently developed cultivars were more tolerant to neck blast, compared to the oldest ones. Furthermore, cultivars with Long A grain shape are the most susceptible to neck blast, followed by medium grain type, round grain and Long B grain shape. A single spray of tricyclazole (450 a.i. g/ha) was effective in reducing disease incidence (55 % average reduction). It was also observed that there was a reduction in severity of symptoms. The majority of rice Italian cultivars are susceptible to neck blast disease. This study underlines the importance of field tests as useful tool for researchers, breeders and growers, combining scientific value with impact in application, giving valuable information to improve disease control.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Resistance to neck blast caused by Pyricularia oryzae in Italian rice cultivars

2015

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“…In comparison with other studies, the mean H e = 0.82 observed in our study was similar to those reported on apple by Urrestarazu et al (2012) (H e = 0.82), Larsen et al (2006) (H e = 0.78), Gasi et al (2010) (H e = 0.78), Pereira-Lorenzo et al (2007) (H e = 0.80), Gharghani et al (2009) (H e = 0.83), Liang et al (2015) (H e = 0.83), and Coart et al (2003) (H e = 0.72 for wild apple populations and 0.77 for ornamental apple populations). Conversely, H e was only 0.44 for grape (Cipriani et al 2010), 0.69 for cacao (Motilal et al 2009) and 0.04 for a self-pollinating species such as rice (Faivre-Rampant et al 2011). The difference with the mean observed heterozygosity (H o = 0.79) could be partly explained because genotypes showing a single peak at a given locus were considered as homozygous, leading to an underestimation of heterozygosity for loci with null alleles that occur at high frequency (Liang et al 2015).…”

Section: Genetic Diversity and Structure Observed In The French Applementioning

confidence: 95%

“…A P (ID) among sibs P (ID)sib was also calculated (Evett and Weir 1998). Finally, the ability of each marker to discriminate two random cultivars was estimated with the Bpower of discrimination^(PD) (Kloosterman et al 1993).…”

Section: Descriptive Statistics Of Genetic Diversitymentioning

confidence: 99%

Genetic Diversity, Population Structure, Parentage Analysis, and Construction of Core Collections in the French Apple Germplasm Based on SSR Markers

et al. 2016

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In-depth characterization of apple genetic resources is a prerequisite for genetic improvement and for germplasm management. In this study, we fingerprinted a very large French collection of 2163 accessions with 24 SSR markers in order to evaluate its genetic diversity, population structure, and genetic relationships, to link these features with cultivar selection date or usage (old or modern, dessert or cider cultivars), and to construct core collections. Most markers were highly discriminating and powerful for varietal identification, with a probability of identity P (ID) over the 21 retained SSR loci close to 10 −28. Pairwise comparisons revealed 34 % redundancy and 18.5 % putative triploids. The results showed that the germplasm is highly diverse with an expected heterozygosity H e of 0.82 and observed heterozygosity H o of 0.83. A Bayesian model-based clustering approach revealed a weak but significant structure in three subgroups (F ST = 0.014-0.048) corresponding, albeit approximately, to the three subpopulations defined beforehand (Old Dessert, Old Cider, and Modern Cultivars). Parentage analyses established already known and yet unknown relationships, notably between old cultivars, with the frequent occurrence of cultivars such as BKing of Pippin^and BCalville Rouge d'Hiver^as founders. Finally, core collections based on allelic diversity were constructed. A large dessert core collection of 278 cultivars contained 90 % of the total dessert allelic diversity, whereas a dessert subcore collection of 48 cultivars contained 71 % of diversity. For cider apples, a 48-cultivar core collection contained 83 % of the total cider allelic diversity.

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“…The frequency of this event is about 1 every 4 years, and the intensity could lead to yield losses larger than 30 % for the most susceptible varieties. Concerning fungal diseases, they affect rice production regardless from the district; blast represents the most serious and widespread pathogen (Faivre-Rampant et al 2011), requiring the application of chemical treatments on more than 75 % of the Italian rice acreage.…”

Section: The Study Areamentioning

confidence: 99%

District specific, in silico evaluation of rice ideotypes improved for resistance/tolerance traits to biotic and abiotic stressors under climate change scenarios

et al. 2015

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Using crop models as supporting tools for analyzing the interaction between genotype and environment represents an opportunity to identify priorities within breeding programs. This study represents the first attempt to use simulation models to define rice ideotypes improved for their resistance to biotic stressors (i.e., diseases); moreover, it extends approaches for evaluating the impact of changes in traits for tolerance to abiotic constraints (temperature shocks inducing sterility). The analysis-targeting the improvement of 34 varieties in six Italian rice districts-was focused on the impact of blast disease, and of pre-flowering cold-and heat-induced spikelet sterility. In silico ideotypes were tested at 5-km spatial resolution under current conditions and climate change scenarios centered on 2020, 2050, and 2085, derived according to the projections of two general circulation models-Hadley and NCAR-for two IPCC emission scenarios-A1B and B1. The study was performed using a dedicated simulation platform, i.e., ISIde, explicitly developed for ideotyping studies. The ideotypes improved for blast resistance obtained clear yield increases for all the combinations GCM×emission scenario×time horizon, i.e., 12.1 % average yield increase Climatic Change under current climate, although slightly decreasing for time windows approaching the end of the century and with a marked spatial heterogeneity in responses across districts. Concerning abiotic stressors, increasing tolerance to cold-induced sterility would lead to a substantial yield increase (+ 9.8 %) only for Indica-type varieties under current climate, whereas no increases are expected under future conditions and, in general, for Japonica-type varieties. Given the process-based logic behind the models used-supporting coherence of model responses under future scenarios-this study provides useful information for rice breeding programs to be realized in the medium-long term.

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Assessment of genetic diversity in Italian rice germplasm related to agronomic traits and blast resistance (Magnaporthe oryzae)

Cited by 48 publications

References 25 publications

Resistance to neck blast caused by Pyricularia oryzae in Italian rice cultivars

Resistance to neck blast caused by Pyricularia oryzae in Italian rice cultivars

Genetic Diversity, Population Structure, Parentage Analysis, and Construction of Core Collections in the French Apple Germplasm Based on SSR Markers

District specific, in silico evaluation of rice ideotypes improved for resistance/tolerance traits to biotic and abiotic stressors under climate change scenarios

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