Pleiotropy of the branching locus (B) masks linked and unlinked quantitative trait loci affecting seed traits in sunflower

Bachlava, Eleni; Tang, Shunxue; Pizarro, G.; Schuppert, Gunnar Felix; Brunick, Robert; Draeger, Doerthe; Leόn, Alberto J.; Hahn, Volker; Knapp, Steven J.

doi:10.1007/s00122-009-1212-1

Cited by 27 publications

(17 citation statements)

References 36 publications

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“…This resulted in selection favoring the fixation of a recessive branching allele at the so-called B -locus in R lines. The B -locus has since been mapped to approximately 27 cM from the top of LG 10 [58].…”

Section: Discussionmentioning

confidence: 99%

Association Mapping and the Genomic Consequences of Selection in Sunflower

et al. 2013

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The combination of large-scale population genomic analyses and trait-based mapping approaches has the potential to provide novel insights into the evolutionary history and genome organization of crop plants. Here, we describe the detailed genotypic and phenotypic analysis of a sunflower (Helianthus annuus L.) association mapping population that captures nearly 90% of the allelic diversity present within the cultivated sunflower germplasm collection. We used these data to characterize overall patterns of genomic diversity and to perform association analyses on plant architecture (i.e., branching) and flowering time, successfully identifying numerous associations underlying these agronomically and evolutionarily important traits. Overall, we found variable levels of linkage disequilibrium (LD) across the genome. In general, islands of elevated LD correspond to genomic regions underlying traits that are known to have been targeted by selection during the evolution of cultivated sunflower. In many cases, these regions also showed significantly elevated levels of differentiation between the two major sunflower breeding groups, consistent with the occurrence of divergence due to strong selection. One of these regions, which harbors a major branching locus, spans a surprisingly long genetic interval (ca. 25 cM), indicating the occurrence of an extended selective sweep in an otherwise recombinogenic interval.

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Section: Discussionmentioning

confidence: 99%

Association Mapping and the Genomic Consequences of Selection in Sunflower

et al. 2013

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“…For instance, branching is a trait that has been selected for during both crop domestication and crop improvement processes (Doebley, Stec & Hubbard 1997; Wacker, Jacomet & Korner 2002; Doust et al . 2004; Li, Zhou & Sang 2006; Doust 2007; Bachlava et al . 2010).…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic photon flux density and phytochrome B interact to regulate branching in Arabidopsis

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et al. 2011

Plant Cell & Environment

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Branching is regulated by environmental signals including phytochrome B (phyB)-mediated responses to the ratio of red to far red light. While the mechanisms associated with phytochrome regulation of branching are beginning to be elucidated, there is little information regarding other light signals, including photosynthetic photon flux density (PPFD) and how it influences phytochrome-mediated responses. This study shows that Arabidopsis (Arabidopsis thaliana) branching is modified by both varying PPFD and phyB status and that significant interactions occur between these variables. While phyB deficiency decreased branching when the PPFD was low, the effect was suppressed by high PPFD and some branching aspects were actually promoted. Photosynthesis measurements showed that PPFD may influence branching in phyB-deficient plants at least partially through a specific signalling pathway rather than directly through energy effects on the shoot. The expression of various genes in unelongated buds of phyB-deficient and phyB-sufficient plants grown under high and low PPFD demonstrated potential roles for several hormones, including auxin, cytokinins and ABA, and also showed imperfect correlation between expression of the branching regulators BRC1 and BRC2 and bud fate. These results may implicate additional undiscovered bud autonomous mechanisms and/or components contributing to bud outgrowth regulation by environmental signals.

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“…Appropriate branching maximizes the utilization of resources and reproductive success to increase fitness (Juenger and Bergelson, 2000;Lortie and Aarssen, 2000;Bonser and Aarssen, 2003;Weinig et al, 2003). Branching is also an important agricultural trait that has been selected for during the domestication and improvement of many crops (Doebley et al, 1997;Wacker et al, 2002;Doust et al, 2004Doust et al, , 2007Li et al, 2006;Bachlava et al, 2010). Branching contributes to yield and quality and end use parameters that are of interest to breeders, producers, and ultimately consumers of agricultural products (Zarrough et al, 1983;Peng et al, 1994;García del Moral and García del Moral, 1995;Zhao et al, 2006;Boe and Beck, 2008).…”

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confidence: 99%