BMC PLANT BIOLOGY BMC PLANT BIOLOGY Does time matter? Intraspecific diversity of ribosomal RNA genes in lineages of the allopolyploid model grass Brachypodium hybridum with different evolutionary ages Trunova Dana Borowska-Zuchowska Natalia Mykhailyk Serhii Xia Kai Zhu Yuanbin Sancho Ruben Rojek-Jelonek Magdalena Garcia Sònia Wang Kai Catalan Pilar Universidad de Zaragoza Kovarik Ales Hasterok Robert Kolano Bozena 2024 research-article