Self-Incompatibility and Outcrossing in Rape and White Mustard

Olsson, Gösta

doi:10.1111/j.1601-5223.1960.tb03085.x

Cited by 57 publications

(12 citation statements)

References 9 publications

(1 reference statement)

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“…Our results show that cross-pollination is not obligatory for this cultivar and, to the best of our knowledge, it is not obligatory for other closely related Belgian cultivars either. Our results are in agreement with several previous observations in oilseed rape hybrid cultivars (Delaplane and Mayer, 2000;Soengas et al, 2013) as well as in other oilseed rape lines (Olsson, 1955(Olsson, , 1960Rives, 1957;Williams, 1978;Williams et al, 1986). Such self-compatibility facilitates cultivation of only one cultivar per field.…”

Section: Discussionsupporting

confidence: 93%

“…Our results are in agreement with several previous observations in oilseed rape hybrid cultivars (Delaplane and Mayer, 2000;Soengas et al, 2013) as well as in other oilseed rape lines (Olsson, 1955(Olsson, , 1960Rives, 1957;Williams, 1978;Williams et al, 1986). Our results are in agreement with several previous observations in oilseed rape hybrid cultivars (Delaplane and Mayer, 2000;Soengas et al, 2013) as well as in other oilseed rape lines (Olsson, 1955(Olsson, , 1960Rives, 1957;Williams, 1978;Williams et al, 1986).…”

Section: Requires Pollen Vectors To Ensure High Fruit and Seed Setsupporting

confidence: 93%

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Breeding System and Pollination Biology of Belgian Oilseed Rape Cultivars (Brassica napus)

2017

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Oilseed rape (Brassica napus L. ssp napus) is considered to be an insect‐pollinated species, but the degree of insect‐dependent pollination differs among cultivars and the contribution of wind pollination remains a matter of debate. In addition, the breeding system has not been assessed for several new cultivars and spontaneous self‐pollination has rarely been addressed. This study aimed to clarify the current situation in Belgium by analyzing the breeding system and pollination biology of the most cropped Belgian cultivars. We performed hand pollination under controlled conditions to analyze the breeding system and conducted field observations to identify the main pollen vectors. The results show that the studied cultivars were highly self‐compatible (self‐compatibility index = 1). Nevertheless, pollen vectors were necessary to produce high fruit and seed set because spontaneous self‐pollination occurred at a low rate under greenhouse conditions. All cultivars produced abundant nectar (1.2 μL per flower per 24 h) with a high sugar content (48%). Surprisingly, very few insects were observed: only 1.1% of the flowers received insect visits during their lifespan. Moreover, wind pollination was only responsible for a small portion (2.5%) of the pollen deposition on stigmas. Despite the lack of pollen vectors, approximately 300 pollen grains were present per stigma. The indirect effects of insects and wind, which favor contact within and between flowers, ensure high fruit and seed set in the main Belgian oilseed rape cultivars.

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Section: Discussionsupporting

confidence: 93%

Section: Requires Pollen Vectors To Ensure High Fruit and Seed Setsupporting

confidence: 93%

Breeding System and Pollination Biology of Belgian Oilseed Rape Cultivars (Brassica napus)

2017

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“…Furthermore, B. napus is often cross-pollinated; fertilization events are approximately one-third cross-fertilization and two-thirds self-fertilization. 42 Self-fertilization causes populations to become composed of homozygous individuals, and high levels of homozygosity limit the effectiveness of recombination. 43 The comparatively high resolution provided by association mapping is dependent upon the structure of LD across the genome.…”

Section: Discussionmentioning

confidence: 99%

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

Zhang

et al. 2015

DNA Res

122

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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“…Canadian breeding has been focusing on seed-yield increase since the 1950s (Downey and Rakow 1995;Katepa-Mupondwa et al 2005). As yellow mustard is an obligate outcrossing species (Olsson 1960), recurrent selection has been a widely used breeding method (Cheng et al 2012), but it is not always effective for seed yield due to low heritability. To enhance breeding efforts, diverse accessions of yellow mustard germplasm have been collected from different parts of the world, and 132 yellow mustard accessions are now maintained at Plant Gene Resources of Canada (PGRC) at Saskatoon.…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity analysis of yellow mustard (Sinapis alba L.) germplasm based on genotyping by sequencing

Cheng

Peterson

2013

Genet Resour Crop Evol

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Recent advances in next generation sequencing technologies make genotyping by sequencing (GBS) more feasible for molecular characterization of plant germplasm with complex and unsequenced genomes. We used a GBS protocol consisting of Roche 454 pyrosequencing, genomic reduction and advanced bioinformatics tools to analyze genetic diversity of 24 diverse yellow mustard accessions. One and one half 454 pyrosequencing runs generated roughly 1.2 million sequence reads totaling about 392 million nucleotides. Application of the computational pipeline DIAL identified 512 contigs and 828 SNPs. The BLAST algorithm revealed alignments of 214 contigs with the sequences reported in NCBI nr/nt database. Sanger sequencing confirmed 95 % of 41 selected contigs and 94 % of 240 putative SNPs. The 454 scored SNPs were highly imbalanced among assayed samples. Diversity analysis of these SNPs revealed that 26.1 % of the total variation resided among landrace, cultivar and breeding lines and 24.7 % between yellow-and black-seeded germplasm. Cluster analysis showed that the black-seeded accessions were largely clustered together and the breeding lines were grouped with known origin. Computer simulation was performed to assess the impact of 454 SNPs missing and revealed considerable changes in allelic count, bias in detection of genetic structure, and large deviations from the expected genetic-distance matrix. These findings are useful for parental selection consideration in yellow mustard breeding, and our detailed analyses help illustrate the utility of GBS in genetic-diversity analysis of plant germplasm, particularly for genetic-relationship assessment.

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Self-Incompatibility and Outcrossing in Rape and White Mustard

Cited by 57 publications

References 9 publications

Breeding System and Pollination Biology of Belgian Oilseed Rape Cultivars (Brassica napus)

Breeding System and Pollination Biology of Belgian Oilseed Rape Cultivars (Brassica napus)

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

Genetic diversity analysis of yellow mustard (Sinapis alba L.) germplasm based on genotyping by sequencing

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