Garlic (A. sativum L.) alliinase gene family polymorphism reflects bolting types and cysteine sulphoxides content

BMC Genetics

Ladislav Kučera¹  Katarína Mitrová¹  Jaroslava Ovesná¹ 

[1] Crop Research Institute, Drnovská 507/73, Prague-Ruzyně, 161 06, Czech Republic

关键词: Bolting type;    Molecular marker;    Polymorphism;    Alliinase;    Garlic;    Allium sativum L.;   

Others  :  1216023
DOI  :  10.1186/s12863-015-0214-z

 received in 2015-01-13, accepted in 2015-05-11,  发布年份 2015

【 摘 要 】

Background

Alliinase is an important enzyme occurring in Allium species that converts precursors of sulfuric compounds, cysteine sulfoxides into a biologically active substance termed allicin. Allicin facilitates garlic defense against pests and produces health-promoting compounds. Alliinase is encoded by members of a multigene family that has not yet been sufficiently characterized, namely with regard to the copy numbers occurring within the genome and the polymorphisms among the family members.

Results

We cloned 45 full-length alliinase amplicons of cultivar (cv.) Jovan. Sequence analyses revealed nine different sequence variants (SVs), confirming the multilocus nature of this gene family. Several mutations in exons, mainly occurring in the first exon coding for vacuolar signal peptide, were found. These results enabled us to identify sequences with putatively modified vacuole-targeting abilities. We found additional sequence variants using partial amplicons. We estimated that the minimum number of gene copies in the diploid genome of the investigated cultivar was fourteen. We obtained similar results for another three cultivars, which differed in bolting type and place of origin. The further identification of high degree of polymorphisms in the intron regions allowed us to develop a specific polymerase chain reaction assay capable to capture intron length polymorphism (ILP). This assay was used to screen 131 additional accessions. Polymorphic data were used for cluster analysis, which separated the bolting and non-bolting garlic types and those with high cysteine-sulfoxide contents in a similar way as AFLP analysis in previous study. These newly developed markers can be further applied for the selection of desirable garlic genotypes.

Conclusions

Detailed analysis of sequences confirmed multigenic nature of garlic alliinase. Intron and exon polymorphism analysis generated similar results as whole genome variability assessed previously by AFLP. Detected polymorphism is thus also associated with cysteine-sulphoxide content in individual genotypes. ILP markers capable to detect intron polymorphisms were newly developed. Developed markers could be applied in garlic breeding. Higher genetic variability found in bolting genotypes may indicates longer period of their sexual propagation in comparison with nonbolting genotypes.

【 授权许可】

   
2015 Ovesná et al.; licensee BioMed Central.

【 图 表 】

Fig. 1.

Fig. 2.

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