Analysis of sink/source relations in bread wheat recombinant inbred lines and commercial cultivars under a high yield potential environment

Alonso, María Pía; Abbate, Pablo Eduardo; Mirabella, Nadia Estefania; Merlos, Fernando Aramburu; Panelo, Juan Sebastián; Pontaroli, Ana Clara

doi:10.1016/j.eja.2017.11.007

Cited by 39 publications

(30 citation statements)

References 26 publications

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“…A biparental population of 146 recombinant inbred lines (RILs) developed by Alonso et al (2018) and studied in early generations [F 3 ; Martino et al 2015, and F 1 -F 2 ; Mirabella et al 2016], was used in all field experiments. The RIL population was derived from 'Baguette 10' (B10) 9 'Klein Chajá' (KCJ), Argentinean spring bread wheat cultivars with contrasting SF, and released in 2000 and 2002, respectively.…”

Section: Plant Materialsmentioning

confidence: 99%

Selection for high spike fertility index increases genetic progress in grain yield and stability in bread wheat

et al. 2018

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Spike fertility index (SF) has been proposed as a promising trait to be used as a selection criterion in wheat breeding programs aimed at increasing grain yield, but no actual evidence of its successful application has been reported. In this study, 146 recombinant inbred lines derived from a cross between 'Baguette 10' and 'Klein Chajá', Argentinean spring bread wheat cultivars with contrasting SF, were evaluated during three crop seasons (2013, 2014 and 2015) at Balcarce, Argentina. Grain yield, grain number/m 2 , grain weight, and SF were measured at maturity. Changes in grain yield (i.e., responses to selection) after application of different selection strategies, including different selection criteria and selection intensities, were determined. Significant correlations were observed between grain number and grain yield, SF and grain yield, and SF and grain weight. Analysis of SF variance components showed a significant genotype 9 environment interaction, but it represented only 9% of the total variation, whereas 51% of the variation was genetic, resulting in a high narrow-sense heritability (0.84). The use of SF as a selection criterion, either solely or in combination with selection for high yield, increased yield, resulting in higher and more stable yields than if selecting for high yield alone. Our findings support the use of spike fertility index as a selection criterion for increasing genetic progress and stability of yield in bread wheat breeding programs.

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Section: Plant Materialsmentioning

confidence: 99%

Selection for high spike fertility index increases genetic progress in grain yield and stability in bread wheat

et al. 2018

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“…Functional interdependencies of physiological traits often depend on pleiotropic relationships or interactions of relevant genetic loci. Therefore, patterns of co-evolution during breeding history between interacting sinks and sources can be assumed (Schulthess et al, 2017;Alonso et al, 2018). In order to meet the projected demand for food and the challenges of climate change Ray et al, 2013), possible linchpins to further increase the yield potential of new cultivars can be f ound by i nv esti gati ng physi olog ical a nd g en et ic interdependencies between yield, yield components, and their links to source and sink components.…”

Section: Introductionmentioning

confidence: 99%

Co-Evolution of Sink and Source in the Recent Breeding History of Winter Wheat in Germany

et al. 2020

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Optimizing the interplay between sinks and sources is of crucial importance for breeding progress in winter wheat. However, the physiological limitations of yield from source (e.g. green canopy duration, GCD) and sink (e.g. grain number) are still unclear. Furthermore, there is little information on how the source traits have been modified during the breeding history of winter wheat. This study analyzed the breeding progress of sink and source components and their relationships to yield components. Field trials were conducted over three years with 220 cultivars representing the German breeding history of the past five decades. In addition, genetic associations of QTL for the traits were assessed with genome-wide association studies. Breeding progress mainly resulted from an increase in grain numbers per spike, a sink component, whose variations were largely explained by the photosynthetic activity around anthesis, a source component. Surprisingly, despite significant breeding progress in GCD and other source components, they showed no direct influence on thousand grain weights, indicating that grain filling was not limited by the source strength. Our results suggest that, 1) the potential longevity of the green canopy is predetermined at the time point that the number of grains is fixed; 2) a coevolution of source and sink strength during the breeding history contribute to the yield formation of the modern cultivars. For future breeding we suggest to choose parental lines with high grain numbers per spike on the sink side, and high photosynthetic activity around anthesis and canopy duration on the source side, and to place emphasis on these traits throughout selection.

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“…Source limitation to GW was noted in some cultivars under different environments 26 . Source for grain filling was found to be a limiting factor when wheat sink capacity increased as exampled in bread wheat recombinant inbred lines with contrasting GN 42 . Therefore, JA defect followed by the accumulation of ABA, a decrease of leaf development, and other unknown factors could all be involved in the GW regulation in tgw1.…”

Section: Discussionmentioning

confidence: 98%

Cloning of wheat keto-acyl thiolase 2B reveals a role of jasmonic acid in grain weight determination

Chen

Yan

et al. 2020

Nat Commun

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Grain weight (GW) is one of the component traits of wheat yield. Existing reports have shown that multiple phytohormones are involved in the regulation of GW in different crops. However, the potential role of jasmonic acid (JA) remains unclear. Here, we report that triticale grain weight 1 (tgw1) mutant, with marked reductions in both GW and JA content, is caused by a premature stop mutation in keto-acyl thiolase 2B (KAT-2B) involved in β-oxidation during JA synthesis. KAT-2B overexpression increases GW in wild type and boosts yield. Additionally, KAT-2B compliments the grain defect in tgw1 and rescues the lethal phenotype of the Arabidopsis kat2 mutant in a sucrose-free medium. Despite the suppression of JA synthesis in tgw1 mutant, ABA synthesis is upregulated, which is accompanied by enhanced expression of SAG3 and reduction of chlorophyll content in leaves. Together, these results demonstrate a role of the JA synthetic gene KAT-2B in controlling GW and its potential application value for wheat improvement.

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Analysis of sink/source relations in bread wheat recombinant inbred lines and commercial cultivars under a high yield potential environment

Cited by 39 publications

References 26 publications

Selection for high spike fertility index increases genetic progress in grain yield and stability in bread wheat

Selection for high spike fertility index increases genetic progress in grain yield and stability in bread wheat

Co-Evolution of Sink and Source in the Recent Breeding History of Winter Wheat in Germany

Cloning of wheat keto-acyl thiolase 2B reveals a role of jasmonic acid in grain weight determination

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