AM root colonization levels differed between the cultivars. One cultivar that is older than 1900 showed the highest (Kremser Perle), whereas another one that is older than 1900
showed the lowest levels of AMroot colonization (Marmande) and the modern cultivar Apero (younger than 1970) showed relatively high AMroot colonization levels. All other cultivars including the two wild-type tomatoes (Lycopersicon hirsutum and Lycopersicon peruvianum) showed intermediate levels of AM root colonization.