Challenges and prospects for a potential allohexaploid Brassica crop

Zhang, Kangni; Mason, Annaliese S.; Farooq, Muhammad Ahsan; Islam, Faisal; Quezada-Martinez, Daniela; Hu, Dandan; Yang, Su; Zou, Jun; Zhou, Weijun

doi:10.1007/s00122-021-03845-8

Cited by 16 publications

(10 citation statements)

References 126 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…chinensis (AA) and B. carinata (BBCC) crosses after artificial chromosome doubling of F 1 hybrids [37]. Treatment of triploid ACC hybrids with colchicine led to hexaploid AACCCC genotype development; these hybrids were largely used as bridge plants for the introgression of genomic components of B. rapa into B. napus [38]. Mason et al [39] showed the possibility of producing trigenomic allohexaploid Brassica through unreduced gametes.…”

Section: Discussionmentioning

confidence: 99%

Effect of Meiotic Polyploidisation on Selected Morphological and Anatomical Traits in Interspecific Hybrids of Brassica oleracea × B. napus

et al. 2021

View full text Add to dashboard Cite

In Brassica, interspecific hybridisation plays an important role in the formation of allopolyploid cultivars. In this study, the ploidy of F1 and F2 generations resulting from interspecific hybridisation between B. oleracea inbred lines of head cabbage (B. oleracea L. var. capitata) (2n = 18) and kale (B. oleracea L. var. acephala) (2n = 18) with inbred lines of rapeseed (B. napus L.) (2n = 38) was examined by flow cytometry analysis and chromosome observation. Furthermore, the effect of meiotic polyploidisation on selected phenotypic and anatomical traits was assessed. The F1 hybrids of head cabbage × rapeseed (S3) and kale × rapeseed crosses (S20) were allotriploids with 2n = 28 chromosomes, and nuclear DNA amounts of 1.97 (S3) and 1.99 pg (S20). These values were intermediate between B. oleracea and B. napus. In interspecific hybrids of the F2 generation, which were derived after self-pollination of F1 hybrids (FS3, FS20) or by open crosses between F1 generation hybrids (FC320, FC230), the chromosome numbers were similar 2n = 56 or 2n = 55, whereas the genome sizes varied between 3.81 (FS20) and 3.95 pg 2C (FC230). Allohexaploid F2 hybrids had many superior agronomic traits compared to parental B. napus and B. oleracea lines and triploid F1 hybrids. In the generative stage, they were characterised by larger flowers and flower elements, such as anthers and lateral nectaries. F2 hybrids were male and female fertile. The pollen viability of F2 hybrids was comparable to parental genotypes and varied from 75.38% (FS3) to 88.24% (FC320), whereas in triploids of F1 hybrids only 6.76% (S3) and 13.46% (S20) of pollen grains were fertile. Interspecific hybrids of the F2 generation derived by open crosses between plants of the F1 generation (FC320, FC230) had a better ability to set seed than F2 hybrids generated from the self-pollination of F1 hybrids. In the vegetative stage, F2 plants had bigger and thicker leaves, larger stomata, and significantly thicker layers of palisade and spongy mesophyll than triploids of the F1 generation and parental lines of B. oleracea and B. napus. The allohexaploid F2 hybrids analysed in this study can be used as innovative germplasm resources for further breeding new vegetable Brassica crops at the hexaploid level.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of Meiotic Polyploidisation on Selected Morphological and Anatomical Traits in Interspecific Hybrids of Brassica oleracea × B. napus

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In fact, there is evidence in some cases that some variations can pre-exist in diploid ancestors that evolution can select upon in the polyploid lineage ( Figure 1 c) [ 30 , 31 , 32 ]. What is more surprising, however, is that in many cases, there is evidence that in the well-studied Arabidopsis arenosa autopolyploids [ 30 ] and Brassica napus allotetraploids [ 33 ] there are (post-WGD) de novo allelic variants potentially involved in meiotic stability ( Figure 1 b).…”

Section: Evolutionary Routes To Meiotic Stability In Polyploidsmentioning

confidence: 99%

All Ways Lead to Rome—Meiotic Stabilization Can Take Many Routes in Nascent Polyploid Plants

Gonzalo

2022

Genes

View full text Add to dashboard Cite

Newly formed polyploids often show extensive meiotic defects, resulting in aneuploid gametes, and thus reduced fertility. However, while many neopolyploids are meiotically unstable, polyploid lineages that survive in nature are generally stable and fertile; thus, those lineages that survive are those that are able to overcome these challenges. Several genes that promote polyploid stabilization are now known in plants, allowing speculation on the evolutionary origin of these meiotic adjustments. Here, I discuss results that show that meiotic stability can be achieved through the differentiation of certain alleles of certain genes between ploidies. These alleles, at least sometimes, seem to arise by novel mutation, while standing variation in either ancestral diploids or related polyploids, from which alleles can introgress, may also contribute. Growing evidence also suggests that the coevolution of multiple interacting genes has contributed to polyploid stabilization, and in allopolyploids, the return of duplicated genes to single copies (genome fractionation) may also play a role in meiotic stabilization. There is also some evidence that epigenetic regulation may be important, which can help explain why some polyploid lineages can partly stabilize quite rapidly.

show abstract

“…Synthetic B. napus lines harbour more disease resistance genes [ 86 ], and are suggested to have wider ecological adaptation compared to their non-synthetic counterparts [ 87 ]. Furthermore, the development of allohexaploid Brassica species containing all the known Brassica subgenomes (A, B and C genomes: U 1935) have been reported from intermating diploid and tetraploid species [ 88 ]. These species are now referred to as “super-brassicas” which exhibit superior agronomic characteristics including climate-resilience traits [ 88 ].…”

Section: Mainmentioning

confidence: 99%

“…Furthermore, the development of allohexaploid Brassica species containing all the known Brassica subgenomes (A, B and C genomes: U 1935) have been reported from intermating diploid and tetraploid species [ 88 ]. These species are now referred to as “super-brassicas” which exhibit superior agronomic characteristics including climate-resilience traits [ 88 ]. Previously, breeders have been successful in breeding Triticale by crossing wheat and rye [ 89 ].…”

Section: Mainmentioning

confidence: 99%

Pangenomics and Crop Genome Adaptation in a Changing Climate

Petereit

Bayer

Thomas

et al. 2022

Plants

View full text Add to dashboard Cite

During crop domestication and breeding, wild plant species have been shaped into modern high-yield crops and adapted to the main agro-ecological regions. However, climate change will impact crop productivity in these regions, and agriculture needs to adapt to support future food production. On a global scale, crop wild relatives grow in more diverse environments than crop species, and so may host genes that could support the adaptation of crops to new and variable environments. Through identification of individuals with increased climate resilience we may gain a greater understanding of the genomic basis for this resilience and transfer this to crops. Pangenome analysis can help to identify the genes underlying stress responses in individuals harbouring untapped genomic diversity in crop wild relatives. The information gained from the analysis of these pangenomes can then be applied towards breeding climate resilience into existing crops or to re-domesticating crops, combining environmental adaptation traits with crop productivity.

show abstract

Challenges and prospects for a potential allohexaploid Brassica crop

Cited by 16 publications

References 126 publications

Effect of Meiotic Polyploidisation on Selected Morphological and Anatomical Traits in Interspecific Hybrids of Brassica oleracea × B. napus

Effect of Meiotic Polyploidisation on Selected Morphological and Anatomical Traits in Interspecific Hybrids of Brassica oleracea × B. napus

All Ways Lead to Rome—Meiotic Stabilization Can Take Many Routes in Nascent Polyploid Plants

Pangenomics and Crop Genome Adaptation in a Changing Climate

Contact Info

Product

Resources

About