Quantitative trait loci for seed yield and yield-related traits, and their responses to reduced phosphorus supply in Brassica napus

Abstract

Different genetic determinants were involved in controlling seed yield and yield-related traits in B. napus under normal and low P conditions. The QTLs detected under reduced P supply may provide useful information for improving the seed yield of B. napus in soils with low P availability in marker-assisted selection.

Genetic control of yield and yield components in winter oilseed rape (Brassica napus L.) grown under nitrogen limitation

“…QTLs for yield components on A4 (QTL for TSW, Ding et al 2012), A8 (QTLs for seed yield, TSW and seed number/area; Shi et al 2009) and C3 were previously reported in rapeseed, and appear to correspond to the regions R-A4, R-A8 and R-C3-b described in the present study. In addition, several studies already reported the presence of QTLs for seed yield related traits on the A5 LG (Ding et al 2012;Fan et al 2010;Shi et al 2009), which supports the hypothesis that this is a critical region for plant breeding purposes.…”

“…In addition, several studies already reported the presence of QTLs for seed yield related traits on the A5 LG (Ding et al 2012;Fan et al 2010;Shi et al 2009), which supports the hypothesis that this is a critical region for plant breeding purposes. Our study showed the importance of R-A5 effects on yield related traits (8.82 \ R 2 \ 34.64 %) and its stability with time and environment, which, to our knowledge, had not yet been demonstrated.…”

“…This was particularly obvious for the R-A5 region where 12 QTLs for seed yield, seed number/m 2 , protein yield and oil yield co-localized. Previous studies also reported the co-localization of QTLs controlling yield and yield components in B. napus (Ding et al 2012) or in other species such as in rice (Wei et al 2012). This raises the question of whether these regions result from the genetic linkage of several independent QTLs or whether they carry master regulators with pleiotropic effects as suggested by Shi et al (2009).…”

“…All these components are impacted by developmental traits (flowering time, seed filling duration), and environmental conditions (climatic conditions, water and fertilizer availability). These traits are all under polygenic control and previous analyses identified several quantitative trait loci (QTLs) for seed oil content (Ecke et al 1995;Gül 2002;Burns et al 2003;Delourme et al 2006;Qiu et al 2006;Zhao et al 2006;Mei et al 2009;Zou et al 2010), seed yield (Udall et al 2006;Radoev et al 2008;Basunanda et al 2010;Chen et al 2010), plant height (Basunanda et al 2010), thousand seed weight (Basunanda et al 2010;Ding et al 2012), number of seeds per area (Ding et al 2012), number of pods per area (Radoev et al 2008) and flowering time Honsdorf et al 2010). However, only a small number of studies were carried out under abiotic stress, such as cold stress (Kole et al 2002;Asghari et al 2007), boron stress (Xu et al 2001) or phosphorus stress Ding et al 2012).…”

“…These traits are all under polygenic control and previous analyses identified several quantitative trait loci (QTLs) for seed oil content (Ecke et al 1995;Gül 2002;Burns et al 2003;Delourme et al 2006;Qiu et al 2006;Zhao et al 2006;Mei et al 2009;Zou et al 2010), seed yield (Udall et al 2006;Radoev et al 2008;Basunanda et al 2010;Chen et al 2010), plant height (Basunanda et al 2010), thousand seed weight (Basunanda et al 2010;Ding et al 2012), number of seeds per area (Ding et al 2012), number of pods per area (Radoev et al 2008) and flowering time Honsdorf et al 2010). However, only a small number of studies were carried out under abiotic stress, such as cold stress (Kole et al 2002;Asghari et al 2007), boron stress (Xu et al 2001) or phosphorus stress Ding et al 2012). In the context of N stress, QTL analyses have been performed on major cereal crops, including barley (Kjaer and Jensen 1995;Gorny and Sodkiewicz 2001;Mickelson et al 2003), maize (Hirel et al 2001;Coque et al 2008), rice (Lian et al 2005;Cho et al 2007) and wheat (Habash et al 2007;Laperche et al 2007) whereas there have been a couple of studies carried out on OSR (Gül 2002, Miro 2010.…”