Submitted to: Arkansas Agricultural Experiment Station Research Series
Publication Type: Experiment Station
Publication Acceptance Date: 12/31/2006
Publication Date: 8/1/2007
Citation: Rutger, J.N., Bryant, R.J. 2007. Development of Two Early-Flowering Indica Germplasms of Rice. Arkansas Agricultural Experiment Station Research Series. 550: p 124-126. Interpretive Summary: This paper describes two early flowering mutants of high grain quality indica rices from IRRI. These lines have US long grain quality in the indica background, making them useful materials for US rice breeders.
Technical Abstract: Two early flowering indica mutant germplasms of rice (Oryza sativa L.), indica-14 and indica-15, were induced from two International Rice Research Institute (IRRI) germplasm lines. The IRRI lines approach US grain quality standards, but are too late in maturity for US conditions. Indica-14 and -15are 23 and 11 days earlier than their indica parents, and are 9 and 21 days later than a prominent japonica check cultivar. They have grain shape and amylose contents similar to US long grain japonica cultivars. Indica-14 and -15, together with four previously released early flowering indica mutants of two other IRRI rice germplasms, provide useful sources of indica diversity for US rice improvement programs.