Anthesis date mainly explained correlations between post-anthesis leaf senescence, grain yield, and grain protein concentration in a winter wheat population segregating for flowering time QTLs

Abstract

The genetic variability of the duration of leaf senescence during grain filling has been shown to affect both carbon and nitrogen acquisition. In particular, maintaining green leaves during grain filling possibly leads to increased grain yield, but its associated effect on grain protein concentration has not been studied. The aim of this study was to dissect the genetic factors contributing to correlations observed at the phenotypic level between leaf senescence during grain filling, grain protein concentration, and grain yield in winter wheat. With this aim in view, an analysis of quantitative trait locus (QTL) co-locations for these traits was carried out on a doubled haploid mapping population grown in a large multienvironment trial network. Pleiotropic QTLs affecting leaf senescence and grain yield and/or grain protein concentration were identified on chromosomes 2D, 2A, and 7D. These were associated with QTLs for anthesis date, showing that the phenotypic correlations with leaf senescence were mainly explained by flowering time in this wheat population. Study of the allelic effects of these pleiotropic QTLs showed that delaying leaf senescence was associated with increased grain yield or grain protein concentration depending on the environments considered. It is proposed that this differential effect of delaying leaf senescence on grain yield and grain protein concentration might be related to the nitrogen availability during the post-anthesis period. It is concluded that the benefit of using leaf senescence as a selection criterion to improve grain protein concentration in wheat cultivars may be limited and would largely depend on the targeted environments, particularly on their nitrogen availability during the post-anthesis period.

Variation for nitrogen use efficiency traits in current and historical great plains hard winter wheat

“…They also noted that the traits for which phenotypic and genotypic correlations were most similar for traits that belonged to the same functionally and/or developmentally related set that they described as being ''a higher degree of genetic and phenotypic character integration.'' The important effect of flowering time has been observed in phenotypic correlations reported in other NUE studies (Bogard et al 2011a;Laperche et al 2007;Cormier et al 2013). The magnitude of the genotypic correlations of FLO and HT with NUE traits in our study were much greater than the magnitude of phenotypic correlations reported previously.…”

“…Some of the purposes of this study, therefore, were to characterize the genetic variation for NUE traits within Great Plains hard winter wheat germplasm and to evaluate trends in the germplasm with year of release. Previous studies in European germplasm and growing environments also have demonstrated that semi-dwarf stature Loddo and Gooding 2012) and flowering time (Bogard et al 2011b) significantly affect NUE traits. Therefore this study also explored the relationships of plant height and flowering time with NUE parameters.…”

“…QTL analyses to identify genomic regions associated with NUE have been conducted using both biparental recombinant inbred and doubled haploid populations from Asian and European germplasm in both seedling and full-season experiments Guo et al 2012;Sun et al 2013;Xu et al 2014;Laperche et al 2006Laperche et al , 2007Laperche et al , 2008Zheng et al 2010;Fontaine et al 2009;Habash et al 2007;Garcia-Suarez et al 2010;Bogard et al 2011bBogard et al , 2013. Association mapping (Bordes et al 2013;Cormier et al 2014) approaches also have been applied to NUE traits.…”

In silico cloning and chromosomal localization of EST sequences that are related to leaf senescence using nulli-tetrasomes in wheat

“…The genetic variability of the duration of leaf senescence during grain filling positively affects wheat grain yields (Bogard et al 2011). Delaying leaf senescence, which is also called stay-green, has practically been achieved in wheat breeding; three stay-green wheat cultivars were developed and released in 2003 by the wheat-breeding group led by Z.L.…”

A simple approach to predict growth stages in winter wheat (Triticum aestivum L.) combining prediction of a crop model and marker based prediction of the deviation to a reference cultivar: A case study in France

“…One major locus for photoperiod sensitivity, called PPD-D1, has been mapped on the short arm of chromosome 2D and the gene cloned (Beales et al, 2007). Allelic variation at this locus has been shown to have a strong impact on wheat earliness and agronomic performances of wheat cultivars Bogard et al, 2011). Homoeologous loci with smaller effects are present on chromosomes 2A and B (Bentley et al, 2010).…”