Associations of SRAP markers with dried-shrink disease resistance in a germplasm collection of sea buckthorn (Hippophae L.)

Abstract

Sea buckthorn (Hippophae L.) is a woody, outcrossing dioecious pioneer plant, being widely planted as a new berry crop with rich nutritional and medicinal compounds. This long-juvenile and long-lived woody plant can be more difficult to cultivate than other crop plants. Dried-shrink disease (DSD) is a dangerous pathogen that destroys sea buckthorn and halts commercial production. We estimated variability of sequence-related amplified polymorphism (SRAP) markers in 77 accessions of 22 sea buckthorn cultivars to seek markers associated with DSD resistance and help to identify potential breeding cultivars. Seventeen SRAP primer combinations generated 289 bands, with a mean of 17 bands per primer combination. At a Dice coefficient of 0.852, the dendrogram generated with 191 polymorphic bands clustered 73 accessions of Hippophae rhamnoides into 2 groups and 4 accessions of Hippophae salicifolia into 1 group. Eleven SRAP markers (Me1-Em3(600), Me1-Em1(680), Me2-Em1(650), Me2-Em1(950), Me3-Em6(1300), Me2-Em6(320), Me2-Em6(400), Me1-Em2(600), Me1-Em1(1200), Me1-Em1(1700), Me2-Em2(250)) were significantly correlated with DSD resistance (P < 0.001). These markers provide a viable option for breeding programs that select lineages with DSD resistance, especially when no other genetic information, such as linkage maps and quantitative trait loci, are available.