Combining ability of non‐adapted sources for male‐fertility restoration in Pampa CMS of hybrid rye*

Miedaner, Thomas; Wilde, Peer; Wortmann, H.

doi:10.1111/j.1439-0523.2004.01038.x

Cited by 29 publications

(39 citation statements)

References 9 publications

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“…More recently hybrids are available with highly effective, environmentally stable restorer genes (Miedaner et al 2005). These genes were detected in a gene bank collection of primitive rye populations and transferred by backcrossing to the elite pollinator breeding materials.…”

Section: Introductionmentioning

confidence: 99%

Genetic variation for ergot (Claviceps purpurea) resistance and alkaloid concentrations in cytoplasmic-male sterile winter rye under pollen isolation

Miedaner

Dänicke

Schmiedchen³

et al. 2009

Euphytica

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Ergot caused by Claviceps purpurea results in the contamination of rye grain by sclerotia that contain alkaloids toxic to humans and other mammals. Ergot incidence and severity are affected by various factors including the availability of pollen during flowering. To test the presence of variation for ergot resistance due to anatomical and/or biochemical factors in rye, we studied cytoplasmic-male sterile (CMS) inbred lines of the Petkus gene pool (two sets each having 30 lines) and their testcrosses with maintainer tester lines (Set I crossed with two and Set II with a third tester line). Sixty-four CMS lines (60 lines, three testers in CMS form, one standard CMS line) and 90 CMS testcrosses were evaluated in four and three environments, respectively, for ergot severity measured as sclerotia weight per ear under pollen isolation and artificial spray inoculation. We also analysed the concentration of the six most important alkaloids and their isomeres in 25 lines. A very high ergot severity was achieved, and despite that genotypic variance among the 64 CMS lines was significant (P \ 0.01). In testcrosses, genotypic variance was smaller, even being not significant in testcrosses of one tester. Genotype 9 environment interaction variances and correlation coefficients between lines and their testcrosses were significant (r = 0.56-0.75, P \ 0.01) in all instances. Most prevalent alkaloids were ergosin, ergocristin, and ergotamin. There were no significant genotypic differences among lines for any alkaloid or isomer, but total alkaloid concentration showed genotypic variation with low significance level (P \ 0.1). In conclusion, we detected genotypic differences for resistance in CMS rye based on variable response of ovaries during infection process that can be exploited by multi-locational evaluation and selection to develop ergot resistant hybrids.

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Section: Introductionmentioning

confidence: 99%

Genetic variation for ergot (Claviceps purpurea) resistance and alkaloid concentrations in cytoplasmic-male sterile winter rye under pollen isolation

Miedaner

Dänicke

Schmiedchen³

et al. 2009

Euphytica

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“…H ybrid breeding is applied to improve the performance of crops. Hybrid breeding entails subdivision of the germplasm into at least two populations denoted as heterotic groups (Melchinger and Gumber, 1998). Genetic variation is generated in each breeding cycle within each heterotic group and progenies are evaluated for performance of testcrosses with testers from the opposite heterotic group (Hallauer and Miranda, 1988).…”

mentioning

confidence: 99%

Impact of Genetic Divergence on the Ratio of Variance Due to Specific vs. General Combining Ability in Winter Triticale

et al. 2009

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The objective of our study was to examine the influence of genetic divergence on the ratio of the components of variance for specific (σ2SCA) and general (σ2GCA) combining ability using experimental data in triticale (×Triticosecale Wittm.). In total, 21 lines and their 210 crosses were evaluated for grain yield in field trials. Published molecular data were reanalyzed, indicating an optimum of two subgroups. The estimates of σ2SCA and σ2GCA were determined for the total diallel and between the two subgroups. The ratio of σ2SCA vs. σ2GCA tended to be lower for crosses between than within genetically distinct groups. Our experimental findings can be interpreted as an indicator of a more favorable ratio of σ2SCA vs. σ2GCA in situations with two genetically distinct populations than in situations with populations that are not genetically distinct.

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“…Hybrids with exotic restorer genes have been reported to be less prone to ergot contamination (Miedaner and Geiger ) and to be superior for pollen‐fertility restoration (Miedaner et al. ). The latter result fully agrees with this study, and the carriers of the exotic Rfp genes resulted in both experiments in high restorer indices of up to 90%.…”

Section: Discussionmentioning

confidence: 99%

“…) and restore male fertility in all P‐CMS‐based hybrids to a high degree (Miedaner et al. ). The Rfp genes from ‘IRAN IX’ and ‘Pico Gentario’ both mapped to the distal part on chromosome 4RL (Miedaner et al.…”

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confidence: 99%

Correlated effects of exotic pollen‐fertility restorer genes on agronomic and quality traits of hybrid rye

et al. 2017

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In CMS (cytoplasmic male sterility)‐based hybrid rye (Secale cereale L.) breeding, effective pollen‐fertility restoration is an essential prerequisite for achieving maximum grain yield on the one hand and for minimizing ergot (Claviceps purpurea) infestation on the other. Restorer genes for the CMS‐inducing ‘Pampa’ cytoplasm derived from landraces collected in Iran and Argentina are used by breeders for achieving this goal. Here, restorer genes from four germplasm sources (‘Altevogt 14160’, ‘IRAN III’, ‘Trenelense’ and ‘Pico Gentario’) were analysed by producing three‐way cross hybrids between an elite CMS single cross and pollinators with and without a given restorer gene. Materials were evaluated on large drilled plots for restorer index (RI), grain yield, plant height and other traits in six environments. In experiment 1, a restorer gene from ‘Altevogt 14160’ was used. Seven pairs of marker‐selected carrier and non‐carrier backcross lines served as pollinators. In experiment 2, the pollinators were 17 backcross line pairs from the other three germplasm sources. These lines were grouped as high (RI > 67%) and low restorers (RI < 30%), respectively, using testcrosses with a highly diagnostic CMS tester. Hybrids carrying an exotic restorer gene suffered from a significant grain yield reduction by 4.4% and 9.4% and were 9.3 and 4.8 cm taller in experiments 1 and 2, respectively. Thousand‐kernel weight was reduced, whereas quality traits were only slightly affected. For all traits, significant genetic variance existed among the testcrosses to the presence vs. absence of a given exotic restorer gene. This offers a chance for the breeder to reduce or ultimately overcome the presently observed performance reductions brought about by exotic restorer genes.

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Combining ability of non‐adapted sources for male‐fertility restoration in Pampa CMS of hybrid rye*

Cited by 29 publications

References 9 publications

Genetic variation for ergot (Claviceps purpurea) resistance and alkaloid concentrations in cytoplasmic-male sterile winter rye under pollen isolation

Genetic variation for ergot (Claviceps purpurea) resistance and alkaloid concentrations in cytoplasmic-male sterile winter rye under pollen isolation

Impact of Genetic Divergence on the Ratio of Variance Due to Specific vs. General Combining Ability in Winter Triticale

Correlated effects of exotic pollen‐fertility restorer genes on agronomic and quality traits of hybrid rye

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