Agriculture Reference
In-Depth Information
Fig. 5.1.
Progress in rice grain yield in Rio Grande do Sul State, Brazil, from 1980 to 2013.
Data source: IRGA (2013).
414), developed in cooperation with Embrapa, were derived directly
from segregating populations developed at CIAT introduced in the mid-
1970s. These populations used semi dwarf parents developed by IRRI
(IR665-31-2-4, IR841-67-1-1, and IR930-2). Variety IRGA 416 was
released in 1991 as a result of a cross between IR841-67-1-1 and BR-
IRGA 409, marking the beginning of the long-term recurrent selection
program at IRGA using locally developed genetic material originating
from initial introductions from CIAT.
The contribution of U.S.
tropical japonica
germplasm for rice breeding
at IRGA has been very important, especially in the case of IRGA 417,
for which New Rex (Table 5.4) was the donor of genes for grain quality
traits. This cultivar was the
first successful case of a genetic cross
between the genomes of
indica
and
japonica
types at IRGA. Nowadays,
IRGA 417 is considered the grain quality standard in Brazil, with long
and slender grains, complete translucence, uniform kernel size, high
head rice yield after industrial processing, and tolerance of delayed
harvest. It has high amylose content, low gelatinization temperature, and
after-cooking features soft and nonsticky grains, which remain so after
cooling and reheating. IRGA 417 is an early-maturing cultivar with high
