Virus damage to Pinellia ternata and its rapid—proliferation technique for virus-free seedlings Comparison of four methods and their efficiency for total RNA extraction from leaves of pinellia ternata STUDY ON DEVELOPING PROCESS OF EMBRYO IN PINELLIA TERNATA Effects of Culture Conditions on Cell Growth and Total Alkaloid Formation in Suspension Cultures of Pinellia ternata Preliminary research on industrialized breeding technology system of Pinellia ternata