Jaehwan Roh
Cheonbuk National University, South Korea.
Title: Evaluation of Durable Blast Resistance of Korean Rice Cultivars with Nursery Test
Biography
Biography: Jaehwan Roh
Abstract
Blast resistance of 16 rice cultivars determined to have durability against rice blast by sequential planting method was compared with nuesery test carrying out at 14 sites for 14 years in Korea.
The average disease severity (ADS) of 16 rice varieties against rice blast showed the resistance as 3.5 degree; however the difference of disease severity among the varieties was from at least 2.0 up to 4.7. ADS of 6 rice cultivars were showed high resistant reaction like as less than 3.0 degree and 10 rice cultivars were showed moderate resistance. Among the 6 rice cultivars presented low ADS, 4 rice cultivars, Gopum, Pungmi1, Sinunbong1, and Baegjinju were constantly appeared high resistant reaction for those 14 years but the other 2 rice cultivars, Ungwang and Keumo3 were showed big variation over the test years. On the other hand, 2 rice cultivars shcu as Sinunbong1 and Keumo3 were showed stable resistance response in all test sites but 4 rice cultivars including Ungwang, Gopum, Pungmi1, and Baegjinju were showed a significant different resisant reaction between the rest sites. As a result of the nuesery test conducted at 14 sites for 14 years, the rice cultivars judged to have durable resistance generally showed less than moderate resistance.
These results indicated that durable resistance test against rice blast using sequential planting is a very effective to predict durability and nursery test for long periods also useful to forecasting indirectly durable resistance of rice cultivars.