Development of SSRs Based on the Whole Genome and Screening of Bolting-Resistant SSR Marker in <i>Brassica oleracea</i> L.
2024
Tong Zhao | Liming Miao | Minghua Zou | Iqbal Hussain | Hongrui Yu | Jia Li | Nairan Sun | Lijun Kong | Shenyun Wang | Jianbin Li | Xiaolin Yu
Simple sequence repeats (SSRs), also known as microsatellites, stand out as the most crucial molecular markers in both animals and plants owing to their high polymorphism, extensive information content, ease of detection through polymerase chain reaction (PCR) assays, and widespread distribution across the genome. In this study, a total of 125,443 SSR loci were identified from the whole-genome sequence of <i>B. oleracea</i>, and 82,948 primer pairs for SSR have been designed. Furthermore, each primer pair is designated with a unique identifier (ranging from <i>BolSSR00001</i> to <i>BolSSR82984</i>). Our findings indicated that certain markers within them could be transferred to other cruciferous crops. In addition, a total of 336 pairs of SSR primers have been used to screen the polymorphism between the bolting-resistant and bolting-easy gene pools. After the test of verification with F<sub>2</sub> generation individual plants, we obtained an SSR dominant marker, <i>BolSSR040196</i>, linked with bolting-resistant locus in cabbage, and the genetic distance between this SSR marker and the bolting-resistant locus was 10.69 cM. Moreover, <i>BolSSR040196</i> is located on the C05 chromosome with a CT motif, characterized by a repeat of 9 in bolting-easy plants and 11 in bolting-resistant plants. Haplotype analysis showed that the correct prediction rate reached 82.35%. The <i>BolSSR040196</i> marker can be used in marker-assisted selection (MAS) breeding, offering a straightforward and efficient approach for bolting-resistant cabbage breeding in the future.
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