Identification of a male-specific amplified fragment length polymorphism (AFLP) marker in <i>Broussonetia papyrifera</i>

Abstract

The present study exhibits amplified fragment length polymorphism (AFLP) molecular marker for sex identification in Broussonetia papyrifera. Based on nine selective amplification primer combinations, 230 bands were produced and the E-AGG/M-CAA combination was found to be a male-specific AFLP marker. Subsequently, this male-specific AFLP fragment was sequenced and converted into a sequence tagged site (STS) marker. Based on STS sequence, two primers, MADB-1 and MADB-2 (Male-Associated DNA from B. papyrifera), were designed to verify the specificity of the fragment. The results indicate that common homology sequence is existed in both male and female plants while one of the bands amplified via MADB-2 primer was solely present in male individuals at high annealing temperature up to 66°C. Finally, MADB-2 primer was introduced to amplify another 16 plants and it revealed that this primer could be used as a convenient, efficient, reliable, and low-cost molecular marker for sex identification in B. papyrifera.

Keywords: Broussonetia papyrifera, AFLP, STS, male-specific marker