A Nest of LTR Retrotransposons Adjacent the Disease Resistance-Priming Gene NPR1 in Beta vulgaris L. U.S. Hybrid H20

Figure 1

BAC physical map showing two LTR retrotransposons SCHULTE and SCHMIDT both highlighted in green and with darker green LTRs with rounded corners. On the other hand, the previously reported CACTA transposon Coe1, highlighted in light beige, has short tan LTRs, a yellow DNA transposase gene and orange ORF1 and ORF2. Exons are rectangles, and direction of arrows indicates direction of transcription. Exons of core plant genes are blue, and exons of hypothetical protein genes are red. Solid lines between exons depict introns. Scale is in 2 Kb increments. BAC is about 130 kilobase pairs. SCHULTE has an integrase gene in orange and a hypothetical gene in red. SCHMIDT has a single ORF retroelement reverse transcriptase polyprotein gene in orange.