‘Drimi9ho’, A Lodging Tolerance with Mid-late Maturing, Improved White-backed Planthopper ( <i>Sogatella furcifera</i> ) and Cultivation Stability

To improve resistance to planthoppers and viral diseases, a new rice cultivar named 'Drimi9ho' was established.The F 1 population, derived from a cross between 'Cheongcheong' and 'Nagdong', was subjected to anther culture.Subsequent generations were advanced in the field under high selection pressure for agronomic traits and disease resistance.Ultimately, the line 'CNDH-AC63-2-2-2-1' was selected through the pedigree method and was named 'Drimi9ho' after undergoing yield trials and local adaptability tests.'Drimi9ho' has a heading date of August 13, which corresponds to 107 days after sowing, making it a mid-late maturing variety that heads 3 d later than 'Cheongcheong'.The culm length of 'Drimi9ho' is 57.3 cm, which is 15 cm shorter than that of 'Cheongcheong'.This reduced culm length contributes to improved tolerance to field lodging.In addition, 'Drimi9ho' exhibits acquired resistance to rice black-streaked dwarf virus through introgression from 'Nagdong'.Compared to 'Cheongcheong', 'Drimi9ho' shows lower protein content and higher amylose content, which resulted in a higher score for cooked-rice palatability.'Drimi9ho' shows improved milling performance compared to 'Cheongcheong'.The 1,000grain weight of 'Drimi9ho' is 22.120.8g, which is heavier than that of 'Cheongcheong' (19.420.8g).The milled rice yield of 'Drimi9ho' is 546.63.8 kg/10a, representing a 4.7% increase compared to 'Cheongcheong' (522.25.8 kg/10a).However, 'Drimi9ho' is resistant only to bacterial leaf blight race K 1 ; thus, timely disease management is required to control other races such as K 2 , K 3 , and K 3a (Registration No. 10610).