Variation of ribosomal DNA and inheritance of polymorphisms in 6 Petunia hybrida hort lines F. Zeboudj, A. Kabbaj, K. Sossey Alaoui, D. Peltier, A. Tagmount, C. Raquin, M. Darmency, D. Maizonnier, H. Dulieu and A. Bervillé Agronomie, 14 8 (1994) 485-495 DOI: 10.1051/agro:19940801