General and specific combining abilities for yellow orange leaf virus resistance in rice varieties
1992
Chongkid, B. | Weerapat, P. | Purivirojkul, W. (Department of Agriculture, Bangkok (Thailand). Rice Research Inst. Pathum Thani Rice Research Center )
Eight rice varieties, ARC11554, GS10719, SPR60, RD9, RD1, RD23, RD7 and TN1 were evaluated for reaction to YOLV, based on differences in percent leaf yellowing, plant height, number of panicle bearing tillers, and grain yield per plant of infected plants. ARC11554 and GS10719 were classified as resistant or tolerant, SPR60 and RD9 as moderately resistant or tolerant, RD1 and RD23 as moderately susceptible, and RD7 and TN1 as susceptible. The inheritance of resistance or tolerance to YOLV was studied in the parental and F1 plants from 28 crosses obtained from diallel crossing among 8 parents. The order of the parent means from the best to worst was ARC11554, GS10719, SPR60, RD9, RD23, RD1, RD7 and TN1 for all characters studied. Most best crosses for all characters came from crosses involving ARC11554 or GS10719 parent. ARC11554 was the best parental variety for general combining ability for all characters while GS10719 was in the second rank. ARC11554xTN1 and GS10719xTN1 were the best crosses for specific combining ability for percent leaf yellowing, GS10719xSPR60 for plant height, ARC11554xRD7 for number of panicle bearing tillers, and ARC11554xRD7 for grain yield per plant.
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