Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 2/27/2000
Publication Date: N/A
Technical Abstract: The main objective of this research was to contribute to increasing food security in participating countries through joint germplasm exchange and evaluation under the different agro-ecological conditions. Countries collaborating in this IAEA/FAO sponsored project were Brazil, Columbia, Costa Rica, Cuba, Guatemala and Uruguay. Twenty-three rice mutant lines developed by the participating countries, ten parent cultivars and a local check cultivar were compared for yield, days to heading, plant height and disease resistance. The mutants and parent cultivars included were: one mutant each from from IRGA 408, Lemont, CR1113, CR1821, Precozicta, BR(IRGA)409 and Orion; three mutants each from EMPASC 101 and Oryzica-1; eight mutants from J104; and two mutants from Guatemala derived from doubled haploids whose parents were not included. Data were collected from 31 yield trials with three replications at 14 locations in the participating countries over one to three years (1996 to 1999). Eight mutant lines already have been incorporated into national rice trials. Desirable mutated characteristics to be transferred through crossing programs included earliness, salinity tolerance, blast resistance, resistance to shattering, translucent grain and milling yield, plant height and especially, high yield potential. These characters were identified in the following mutants: IRGA 408 #1 (SC 116), LA 43 (CIA 2741), EMPASC 101 #1, EMPASC 101 #2 and EMPASC 101 #3 developed in Brazil, 88M (485 M2) and 331M (333M2) developed in Columbia, J104N2-C36-2-2, J104N3-C91-6-2 and J104 G3-291-4-2 developed in Cuba, Precozicta M1DH and 10491-1 M1DH developed in Guatemala, L1435 developed in Uruguay, and OR 172 developed in the USA.