How can wheat landraces contribute to present breeding?

Dotlačil, L.; Hermuth, J.; Stehno, Z.; Dvořāček, Václav; Bradová, J.; Leišová, L.

doi:10.17221/1519-cjgpb

Cited by 36 publications

(27 citation statements)

References 5 publications

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“…Our results show a boost of durum wheat yield in Mediterranean countries resulting from the use of improved varieties, in agreement with previous studies (Koç et al 2000;De Vita et al 2007;Royo et al 2008). This yield increase was accompanied by a significant decrease in grain protein content, agreeing with Dotlačil et al (2010). The known negative relationship between yield and protein content (Rharrabti et al 2001) is associated with dilution of nitrogen compounds when carbohydrate deposition increases through photosynthesis (Lawlor 2002;Martre et al 2003).…”

Section: Discussionsupporting

confidence: 74%

Can Mediterranean durum wheat landraces contribute to improved grain quality attributes in modern cultivars?

et al. 2011

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The variability for quality attributes existing in a collection of 154 durum landraces from 20 Mediterranean countries and 18 modern cultivars was determined with the ultimate goal of identifying potential quality-enhancing genotypes for use in breeding programs. Field experiments were conducted during 3 years under rainfed conditions in northeastern Spain. Environmental effects were the most important in determining protein content, grain yield and yellow color index of the endosperm (grain flour), and the least important in determining EU quality index (QI), gluten strength and grain filling rate. QI is a weighed composite index determined from protein content, gluten strength, yellow color index and thousand kernel weight. Multivariate analysis detected four groups; three including landraces and one comprising modern cultivars. Landraces from the eastern Mediterranean countries had the highest mean QI and the widest variability for individual quality traits, but were characterized by relatively small grains. Landraces from the western Mediterranean countries had greater grain filling rates and heavier grains. Protein content, gluten strength and yellow color index were similar between eastern and western groups. The low QI and reduced variability characterizing the landrace group from the north Balkan Peninsula support the hypothesis of a different origin for this group. Modern cultivars, as a group, were the most productive and showed high QI, but they had the lowest grain protein content and phenotypic variability. Landraces that could be used as sources of quality-improving attributes and/or those that could be used in breeding programs without substantial quality handicaps were identified from different groups. Landraces can be particularly useful in breeding programs to improve gluten strength, grain weight and accelerate grain filling rate.

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Section: Discussionsupporting

confidence: 74%

Can Mediterranean durum wheat landraces contribute to improved grain quality attributes in modern cultivars?

et al. 2011

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“…A previous study with the same historical series used here reported an average yield gain of 0.61% year -1 (Royo et al 2008), which indicates that the yield increases achieved during the 20th Century largely compensated for the decreases in the protein content of the newly released cultivars. Several studies have reported increases in grain yield accompanied by significant decreases in grain protein content (Motzo et al 2004;De Vita et al 2007;Dotla cil et al 2010;Nazco et al 2012). The negative relationship between yield and protein content (Rharrabti et al 2001) has been associated with a dilution effect of nitrogen compounds when carbohydrate deposition increases through photosynthesis (Lawlor 2002;Martre et al 2003).…”

Section: Genetic Gains In Grain Quality Traitsmentioning

confidence: 99%

Breeding progress in the pasta-making quality of durum wheat cultivars released in Italy and Spain during the 20th Century

et al. 2014

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Abstract. Genetic improvement of quality traits of durum wheat achieved in Italy and Spain during the 20th Century was investigated using an historical series of 12 cultivars from each country. The European Union durum wheat quality index increased by 6.25% (0.13% year Spain) were the consequence of the progressive incorporation into recent cultivars of favourable low molecular weight glutenin subunits (LMW-GS). Breeding increased the frequency of the LMW-GS combination aaa, which was present in 75% of all intermediate cultivars and in 100% of the modern Italian cultivars. A LMW-GS combination not previously reported (d?b) was identified in two modern Spanish cultivars. Breeding programs were also successful in increasing the stability of gluten strength and the sedimentation index.

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“…According to our previous observations, the frequency of the discovery of a novel HMW-GS in hexaploid wheat (Triticum aestivum L.) is very low, especially within the modern cultivars. Nevertheless, the screening of the collections of the maintained landraces and obsolete cultivars could increase the probability of finding novel or very lowly expressed HMW-GSs, even using such a simple analytical approach as SDS-PAGE (Gregová et al 2004) and landraces can contribute also breeding programes at present (Dotlačil et al 2010). The nucleotide sequence of the gene 1Dy12.3 and the deduced amino acid sequence of the protein were deposited in the GenBank database (GenBank: EF472958, Gregová & Mihálik 2007, unpublished).…”

Section: Glutenin Extraction and Hmw-gs Analysismentioning

confidence: 99%

Characterisation of a novel high-molecular-weight glutenin subunit 1Dy12.3 from hexaploid wheat (Triticum aestivum L.)

Mihálik¹,

Gregová²,

Galuszka³

et al. 2012

CZECH J GENET PLANT

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Abstract:A novel high-molecular-weight glutenin subunit encoded by the Glu-1D locus was identified in hexaploid wheat (Triticum aestivum L.) cultivar Noe and was designated as 1Dy12.3. This subunit differed in SDS-PAGE mobility from the well-known 1Dy10 and 1Dy12 subunits that are also encoded by this locus. An analysis of the gene sequences confirmed the uniqueness of 1Dy12.3 and revealed that it is most closely related to the 1Dy12 subunit. The size of the deduced protein was calculated to be 67 884 Da, which is different from the 1Dy10 and 1Dy12 subunits (67 475 Da and 68 713 Da, respectively). The 1Dy12.3 protein consists of 652 residues, with a highly conserved signal sequence and N-and C-terminal domains, although the central repetitive domain comprising motifs of hexapeptide (PGQGQQ) and nonapeptide (GYYPTSLQQ) repeats was less conserved. The 1Dy12.3 subunit demonstrates fewer QHPEQG hexapeptide motifs and exhibits an increased number of methionine residues in comparison to the other characterised high-molecular-weight glutenin subunits. The 1Dy12.3 subunit was cloned and expressed in Escherichia coli and was detected with a prolamin-specific antibody. The size of the detected immunocomplex corresponded to the native 1Dy12.3 protein isolated from grains. The existence and characterisation of this novel high-molecular-weight glutenin subunit increases the diversity of the glutenins encoded by the Glu-1D locus.

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How can wheat landraces contribute to present breeding?

Cited by 36 publications

References 5 publications

Can Mediterranean durum wheat landraces contribute to improved grain quality attributes in modern cultivars?

Can Mediterranean durum wheat landraces contribute to improved grain quality attributes in modern cultivars?

Breeding progress in the pasta-making quality of durum wheat cultivars released in Italy and Spain during the 20th Century

Characterisation of a novel high-molecular-weight glutenin subunit 1Dy12.3 from hexaploid wheat (Triticum aestivum L.)

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