Journal ArticleDOI
Quantitative trait analysis of flowering time in spring rapeseed (B. napus L.)
TLDR
Identification of the chromosomal location and effect of the genes influencing flowering time may hasten the development of canola varieties having an optimal time for flowering in target environments such as for high altitude areas, via marker-assisted selection.Abstract:
The inheritance of flowering time trait in spring-type rapeseed (Brassica napus L.) is poorly understood, and the investigations on mapping of quantitative trait loci (QTL) for the trait are only few. We identified QTL underlying variation for flowering time in a doubled haploid (DH) mapping population of nonvernalization-responsive canola (B. napus L.) cultivar 465 and line 86 containing introgressions from Houyou11, a Chinese early-flowering cultivar in Brassica rapa L. Significant genetic variation in flowering time and response to photoperiod were observed among the DH lines from 465/86. A molecular linkage map was generated comprising three types of markers loci. QTL analysis indicated that flowering time is a complex trait and is controlled by at least 4 major loci, localized on four different linkage groups A6, A7, C8 and C9. These loci each accounted for between 9.2 and 12.56 % of the total genotypic variation for first flowering. The published high-density maps for flowering time mapping used different marker systems, and the parents of our crosses have different genetic origins, with either spring-type B. napus or B. rapa. So we cannot determine whether the QTL on the same linkage groups were in the same region or not. There was evidence of additive × additive epistatic effects for flowering time in the DH population. Epistasis existed not only between main-effect QTLs, but also between QTLs with minor effects. Four pair of epistasis effects between minor QTLs explained about 20 % of the genetic variance observed in the DH population. The results indicated that minor QTLs for flowering time should not be ignored. Significant genotypes × environment interactions were also found for the quantitative traits, and with significant change in the ranking of the DH lines in different environments. The results implied that FQ3 was a non-environment-specific QTL and may control flowering time by autonomous pathway. FQ4 were winter-environment-specific QTL and may control flowering time by photoperiod-pathway. Identification of the chromosomal location and effect of the genes influencing flowering time may hasten the development of canola varieties having an optimal time for flowering in target environments such as for high altitude areas, via marker-assisted selection.read more
Citations
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Journal ArticleDOI
Genome-wide association study reveals the genetic architecture of flowering time in rapeseed (Brassica napus L.)
Liping Xu,Kaining Hu,Zhenqian Zhang,Chunyun Guan,Song Chen,Wei Hua,Jiana Li,Jing Wen,Bin Yi,Jinxiong Shen,Chaozhi Ma,Jinxing Tu,Tingdong Fu +12 more
TL;DR: Results indicate that GWAS is an effective method by which to reveal natural variations of complex traits in B. napus and provide new insights into the genetic control of flowering time in the allopolyploid species.
Journal ArticleDOI
Diverse regulatory factors associate with flowering time and yield responses in winter-type Brassica napus.
TL;DR: The results suggest that flowering time regulation within an adapted B. napus breeding pool is driven by a high number of small modulating processes rather than major transcription factors like Bna.CO, and yield regulation appears highly parallel, therefore yield could be increased by pyramiding positively associated haplotypes.
Journal ArticleDOI
Association Mapping of Flowering Time QTLs and Insight into Their Contributions to Rapeseed Growth Habits.
Nian Wang,Biyun Chen,Kun Xu,Guizhen Gao,Feng Li,Jiangwei Qiao,Guixin Yan,Jun Li,Hao Li,Xiaoming Wu +9 more
TL;DR: It is shown that both flowering time QTLs and genes play important roles in rapeseed growth habits, and this results will be applied to rapeseed breeding programs, and will aid in the understanding of the relation between flowering time variations and growth habits in plants.
Journal ArticleDOI
Major Co-localized QTL for Plant Height, Branch Initiation Height, Stem Diameter, and Flowering Time in an Alien Introgression Derived Brassica napus DH Population.
TL;DR: One doubled haploid population obtained from a cross between Y689 and Westar shows that these traits were significantly positively correlated with one another and with flowering time (FT), which provides useful information for further genetic studies on stem-related traits and plant growth adaptation.
Journal ArticleDOI
QTL Alignment for Seed Yield and Yield Related Traits in Brassica napus.
Nadia Raboanatahiry,Hongbo Chao,Hongbo Chao,Hou Dalin,Hou Dalin,Pu Shi,Wei Yan,Longjiang Yu,Baoshan Wang,Maoteng Li,Maoteng Li +10 more
TL;DR: The present results would be helpful to develop molecular markers for yield associated traits and could be used for breeding improvement in B. napus.
References
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Journal ArticleDOI
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Journal ArticleDOI
FLOWERING LOCUS C Encodes a Novel MADS Domain Protein That Acts as a Repressor of Flowering
TL;DR: This study reports that flc null mutations result in early flowering, demonstrating that the role of active FLC alleles is to repress flowering, and proposes that the level of FLC activity acts through a rheostat-like mechanism to control flowering time in Arabidopsis and that modulation of F LC expression is a component of the vernalization response.
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