Submitted to: American Society of Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 7/23/2003
Publication Date: 9/15/2003
Citation: Eizenga, G.C., Padolino, T., Azam, M., Cheema, A.A., Ismachin, M., Ismail, A., Koh, H.J., Senghaphan, R., Shu, Q., Tuan, V.D., Zhu, X., Maluszynski, M. 2003. Evaluation of rice mutants in multi-location trials conducted in the Southeast Asian region [abstract]. In: 2003 American Society of Agronomy Abstracts. 2003 CDROM. Interpretive Summary: Abstract only - interpretive summary not required
Technical Abstract: Induced mutation is an important tool for rice breeders to use for incorporating new variation into currently used rice (Oryza sativa L.) Varieties. The objective of this study was to evaluate selected rice mutants and their parent varieties in nine different southeast Asian countries for their usefulness in the rice breeding programs of countries other than the country which developed the mutant rice line. Included in the study were 19 mutant lines contributed by Bangladesh, China, Indonesia, Korea, Malaysia, Pakistan, Philippines, Thailand, Vietnam, India and Myanmar; the 16 varieties which the mutant lines were derived from; and IR64 as the check variety. The trials were replicated three times over three years at 16 locations in nine countries. Characteristics measured included days to heading, plant height, number of productive tillers per plant, yield and reaction to rice diseases e.g. bacterial leaf blight, blast, brown spot, rice tungro virus and sheath blight. Starch related quality characteristics including apparent amylose content, gelatinization temperature and alkali spreading value were determined by China. Overall 13 of the 19 mutant lines and 4 of the 15 parent varieties were included in national trials and/or used for breeding. Desired traits being introduced from these mutant and parent lines included high yield, reduced plant height, disease resistance, early flowering and aroma.