Small RNA Profiling of Aster Yellows Phytoplasma-Infected Plants Showing Different Symptoms.

Micropropagated plants infected with ' Phytoplasma asteris' showed virescence symptoms, witches' broom symptoms, or became asymptomatic after their planting in pots. Nine plants were grouped into three categories according to these symptoms, which were then employed for investigation. The phytoplasma concentration, as determined by qPCR, correlated well with the severity of symptoms.