Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: February 27, 2000
Publication Date: N/A
Technical Abstract: The Dale Bumpers National Rice Research Center (DB NRRC) was formally named on October 22, 1998. The mission of the DB NRRC is to conduct research to help keep the U.S. rice industry competitive in the global marketplace, by assuring high yields, superior grain quality, pest resistance and stress tolerance. Emphases are on genetic improvement, biology and physiology of weeds, and physiology of rice yield. A new thrust at the DB NRRC is the establishment of a Rice Genomic Resources Program. Nine categories of research are underway or planned: Rice Genetics; Evaluation and Enhancement of Rice Germplasm; Biology, Physiology, and Control of Weeds in Rice; Cereal Chemistry; Molecular Genetics; Cytogenetics; Molecular Plant Pathology; Plant Physiology; and Molecular Biology. Rice Genetics includes induction of useful mutants, and base broadening with indica semidwarfs. Induced mutants include semidwarfs in recent varieties: Kaybonnet (6), LaGrue (4), Adair (2), Katy (2), Millie (1), Alan (1), and Orion (1). All are nonallelic to sd1, the worldwide semidwarfing gene. Other induced mutants include low phytic acid in Kaybonnet in cooperation with Victor Raboy, early flowering mutants in LaGrue and Oryzica llanos cinco, dominant male steriles in Kaybonnet and Orion, and a recessive male sterile in Cypress. Early flowering and semidwarf mutants of basmati have been crossed to obtain early flowering, semidwarf recombinants. Base broadening with indica semidwarfs involves re-creation of U.S. tropical japonica grain quality on the high-yielding indica germplasm foundation. The first steps in the effort have been to cross late-maturing, good-quality, indica experimentals from IRRI with the very early and high yielding indica variety Zhe 733 from China.