Elimination of Bean yellow mosaic virus from infected cormels of three cultivars of gladiolus using thermo-, electro- and chemotherapy
Tóm tắt
Bean yellow mosaic virus (BYMV) is a prevalent virus and major threat to gladiolus cultivation the world over. In the gladiolus repository at CSIR-NBRI, Lucknow, several plants (82–88%) of three economically important cultivars were found infected by BYMV showing severe mosaic and stripe symptoms. Affected plants exhibit diminished quality and quantity of florets and corms, thus reducing their value. Attempts were made to eliminate BYMV from the infected gladiolus cormel explants in vitro through thermotherapy (37 °C for 30 days), chemotherapy (30 mg/L ribavirin for 30 days), and electrotherapy (30 mA for 20 min), either alone and in different combinations. The in vitro regenerated plants were free from BYMV infection when checked by RT-PCR using BYMV-specific primers. The combination of electro- and chemotherapies has given the best response as compared to other treatments. Among the individual therapies, electrotherapy (30 mA/20 min) was found to be the best for and production of BYMV-free gladiolus plants (44–46%) with moderate regeneration efficiency (54–58%) followed by chemotherapy and thermotherapy. However, the cormels obtained from a combination of electro- and chemotherapy treatment (30 mA/20 min + 30 mg/L) has given highest virus free (46–52%) and highest therapy efficiency indices (56%) as compared to other treatments. Further, these cormels showed better developed root systems and produced more cormels which were larger in size as compared to the other treatments and control when grown in tissue culture media.
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