Quantitative trait analysis of flowering time in spring rapeseed (B. napus L.)

Luo, Ying; Luo, Chaoyu; Du, Dezhi; Fu, Zuntao; Yao, Yanmei; Xu, Chunyan; Zhang, H. S.

doi:10.1007/s10681-014-1140-2

Cited by 18 publications

(11 citation statements)

References 81 publications

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“…In addition, when comparing our results with previous flowering time studies for rapeseed, many of the flowering QTLs reported by others were not detected in this study. For example, QTLs on linkage groups C09 (Luo et al, 2014 ) and A05 (Long et al, 2007 ) could not be identified in the present study. This omission may be attributed to the fact that we only grew the rapeseed core collection panel in four environments: JX2007, JX2012, WH2013, and YL2013.…”

Section: Discussioncontrasting

confidence: 69%

Association Mapping of Flowering Time QTLs and Insight into Their Contributions to Rapeseed Growth Habits

Wang

Gao

et al. 2016

Front. Plant Sci.

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Plants have developed sophisticated systems to adapt to local conditions during evolution, domestication and natural or artificial selection. The selective pressures of these different growing conditions have caused significant genomic divergence within species. The flowering time trait is the most crucial factor because it helps plants to maintain sustainable development. Controlling flowering at appropriate times can also prevent plants from suffering from adverse growth conditions, such as drought, winter hardness, and disease. Hence, discovering the genome-wide genetic mechanisms that influence flowering time variations and understanding their contributions to adaptation should be a central goal of plant genetics and genomics. A global core collection panel with 448 inbred rapeseed lines was first planted in four independent environments, and their flowering time traits were evaluated. We then performed a genome-wide association mapping of flowering times with a 60 K SNP array for this core collection. With quality control and filtration, 20,342 SNP markers were ultimately used for further analyses. In total, 312 SNPs showed marker-trait associations in all four environments, and they were based on a threshold p-value of 4.06 × 10−4; the 40 QTLs showed significant association with flowering time variations. To explore flowering time QTLs and genes related to growth habits in rapeseed, selection signals related to divergent habits were screened at the genome-wide level and 117 genomic regions were found. Comparing locations of flowering time QTLs and genes with these selection regions revealed that 20 flowering time QTLs and 224 flowering time genes overlapped with 24 and 81 selected regions, respectively. Based on this study, a number of marker-trait associations and candidate genes for flowering time variations in rapeseed were revealed. Moreover, we also showed that both flowering time QTLs and genes play important roles in rapeseed growth habits. These results will be applied to rapeseed breeding programs, and they will aid in our understanding of the relation between flowering time variations and growth habits in plants.

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Section: Discussioncontrasting

confidence: 69%

Association Mapping of Flowering Time QTLs and Insight into Their Contributions to Rapeseed Growth Habits

Wang

Gao

et al. 2016

Front. Plant Sci.

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“…rapa , Lou et al . [ 22 ] detected four flowering time QTL on A6, A7, C8 and C9 in three environments and one QTL on C2 in one environment. Of these two C-genome QTL, the C9 QTL was found to be involved in photoperiod-responsive flowering while the C8 QTL was found not to be influenced by environment and might be involved in the control flowering through the autonomous pathway.…”

Section: Discussionmentioning

confidence: 99%

“…Lou et al . [ 22 ] detected a QTL on C2 by growing a spring B . napus DH population in a winter-crop area in China; however, this QTL could not be detected while the population was grown in a spring-crop area.…”

Section: Discussionmentioning

confidence: 99%

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Molecular mapping of QTL alleles of Brassica oleracea affecting days to flowering and photosensitivity in spring Brassica napus

2018

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Earliness of flowering and maturity are important traits in spring Brassica napus canola–whether grown under long- or short-day condition. By use of a spring B. napus mapping population carrying the genome content of B. oleracea and testing this population under 10 to 18 h photoperiod and 18 to 20 0C (day) temperature conditions, we identified a major QTL on the chromosome C1 affecting flowering time without being influenced by photoperiod and temperature, and a major QTL on C9 affecting flowering time under a short photoperiod (10 h); in both cases, the QTL alleles reducing the number of days to flowering in B. napus were introgressed from the late flowering species B. oleracea. Additive effect of the C1 QTL allele at 14 to18 h photoperiod was 1.1 to 2.9 days; however, the same QTL allele exerted an additive effect of 6.2 days at 10 h photoperiod. Additive effect of the C9 QTL at 10 h photoperiod was 2.8 days. These two QTL also showed significant interaction in the control of flowering only under a short-day (10 h photoperiod) condition with an effect of 2.3 days. A few additional QTL were also detected on the chromosomes C2 and C8; however, none of these QTL could be detected under all photoperiod and temperature conditions. BLASTn search identified several putative flowering time genes on the chromosomes C1 and C9 and located the physical position of the QTL markers in the Brassica genome; however, only a few of these genes were found within the QTL region. Thus, the molecular markers and the genomic regions identified in this research could potentially be used in breeding for the development of early flowering photoinsensitive B. napus canola cultivars, as well as for identification of candidate genes involved in flowering time variation and photosensitivity.

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“…The potential of rapeseed yield depends to a large extent on flowering time. 6 Rapeseed can be widely planted in China, which is the leading country for rapeseed production. One of the main reasons for its widespread growth is that it does not compete with cultivated land for summer crops such as rice and maize.…”

Section: Introductionmentioning

confidence: 99%

Genome-wide association study reveals the genetic architecture of flowering time in rapeseed (Brassica napus L.)

Zhang

et al. 2015

DNA Res

123

135

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Flowering time adaptation is a major breeding goal in the allopolyploid species Brassica napus. To investigate the genetic architecture of flowering time, a genome-wide association study (GWAS) of flowering time was conducted with a diversity panel comprising 523 B. napus cultivars and inbred lines grown in eight different environments. Genotyping was performed with a Brassica 60K Illumina Infinium SNP array. A total of 41 single-nucleotide polymorphisms (SNPs) distributed on 14 chromosomes were found to be associated with flowering time, and 12 SNPs located in the confidence intervals of quantitative trait loci (QTL) identified in previous researches based on linkage analyses. Twenty-five candidate genes were orthologous to Arabidopsis thaliana flowering genes. To further our understanding of the genetic factors influencing flowering time in different environments, GWAS was performed on two derived traits, environment sensitivity and temperature sensitivity. The most significant SNPs were found near Bn-scaff_16362_1-p380982, just 13 kb away from BnaC09g41990D, which is orthologous to A. thaliana CONSTANS (CO), an important gene in the photoperiod flowering pathway. These results provide new insights into the genetic control of flowering time in B. napus and indicate that GWAS is an effective method by which to reveal natural variations of complex traits in B. napus.

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Quantitative trait analysis of flowering time in spring rapeseed (B. napus L.)

Cited by 18 publications

References 81 publications

Association Mapping of Flowering Time QTLs and Insight into Their Contributions to Rapeseed Growth Habits

Association Mapping of Flowering Time QTLs and Insight into Their Contributions to Rapeseed Growth Habits

Molecular mapping of QTL alleles of Brassica oleracea affecting days to flowering and photosensitivity in spring Brassica napus

Genome-wide association study reveals the genetic architecture of flowering time in rapeseed (Brassica napus L.)

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