دور البيون و الالوبيرنول في تحريض المقاومة الجهازية المكتسبة إزاء فيروس البطاطا واي في نباتات البطاطا البطاطس

Abstract EN

Two chemical inducers, Bion and allopurinol , were used in three concentrations (0.2, 0.5 and 1.0 mM) to induce systemic resistance in potato plants against Potato virus Y (PVY), and to limit and suppress the incidence and severity of virus infection.

The results showed that Bion and allopurinol had a significant effect on the development of virus infection.

The progress of PVY infection was rapid in control plants (untreated plants), and most of those plants developed severe mosaic symptoms, and some leaves showed leaf deformation and virus incidence reached 100% and disease severity ranged between 15.8 and 41.6%, 25 and 35 days after inoculation, respectively.

In contrast, mild mosaic and mosaic symptoms were observed on few Bion and allopurinol-treated plants, with delay in symptoms appearance, and virus incidence ranged between 30 and 46%, whereas disease severity ranged between 3 and 12.3%, based on the concentration used.

In addition, Bion and allopurinol reduced stunting level of treated plants as compared with untreated ones; with stunting level of treated plant ranged between 13 and 33.2%, whereas it reached 46.5% in untreated plants, 45 days after inoculation.

Yield of treated plants was reduced and ranged between 15.6 and 39.9%, and was far less than in untreated plants 73.4%.

Treatments led to reduction of virus concentration in Bion and allopurinol-treated plants as compared with untreated ones.

Bion had more efficacy in controlling PVY infection than allopurinol, and the concentration of 1.0 mM had significantly better effect than other treatments at probability level of 5%.