Agriculture Reference
In-Depth Information
Table 5.4.
Year of release, name of breeding line, and progenitors of IRGA
'
s semidwarf
rice cultivars.
Cultivar
Year
Name of breeding line
Parents
BR-IRGA 409
z
1979
P790-B4-4-1T
IR930-2/IR665-31-2-4
BR-IRGA 410
z
1980
P798-B4-4-1T
IR930-53/IR665-31-2-4
BR-IRGA 412
z
1986
Seleção da BR-IRGA 409
IR930-2/IR665-31-2-4
BR-IRGA 413
z
1986
Seleção da BR-IRGA 409
IR930-2/IR 665-31-2-4
BR-IRGA 414
z
1987
P793-B4-38-1T
IR930-2/IR665-31-7-4
IRGA 416
1991
IRGA 172-119-3CS
IR841-67-1-1/BR-IRGA 409
IRGA 417
1995
IRGA 318-11-6-9-2B
New Rex/IR19743-25-2-2//BR-IRGA
409
IRGA 418
1999
IRGA 284-1-18-2-2-2
BR-IRGA 412/CICA 9//BR-IRGA 409
IRGA 419
1999
IRGA 369-31-2-3F-A1-1
Oryzica 1/BR-IRGA 409
IRGA 420
1999
IRGA 370-42-1-1F-C1
Oryzica 1/BR-IRGA 412
IRGA 421
2000
Seleção da IRGA 416
IR841-67-1-1/BR-IRGA 409
IRGA 422CL
2002
IRGA 22-7
IRGA 417
*
6/93AS3510
IRGA 423
2007
IRGA 1782-2-1C-2-A
IRGA 370-16-2-1-1F/IRGA 416//
IRGA 411-1-6-1F-A
IRGA 424
2007
IRGA 2423-3-6V-3V-1
IRGA 370-42-1-1F-B5/BR-IRGA
410//IRGA 411-1-6-1F-A
IRGA 425
2009
IRGA 2911-24-3-I-1Pg
IRGA 1598-3-2F-1-4-1/EPAGRI 108
IRGA 426
2011
IRGA 2852-20-4-3-3
IRGA 411-1-6-1F-A/IRGA 976-4-6-
1F-1-1-1//IRGA 417
IRGA 427
2011
IRGA 2913-56-4-I-3Pg
IRGA 1598-3-2F-1-4-1/CT 8008-16-
31-8P-1
IRGA 428
2011
IRGA 420CL-1
IRGA 420
*
6/PCW16
IRGA 424RI
2013
IRGA 424RI-27006-1
IRGA 424
*
6/IRGA 420CL-1
IRGA 429
2013
IRGA 3217-3-4Pg-2Pg-7
IRGA 1598-3-2F-1-4-1/EPAGRI
108//IRGA 440-49-2-2-5
IRGA 430
2013
IRGA 3476-7-1-MP-4
CT 10816-2-CA-12-M/GT 368094
Cachoeirinha, IRGA/EEA, 2013.
z
Cultivars released in partnership with EMBRAPA Temperate Climate
-
Pelotas, RS,
Brazil.
cultivars, associated with the evolution of new crop management prac-
tices, helped to increase rice yields in RS to 95 kg per year over a period
of 33 seasons, from 4.03 t ha
1
in the 1980
1981 season to 7.45 t ha
1
in
-
2012
2013 (Fig. 5.1). On the other hand, new challenges have emerged
for rice breeders since old semidwarf cultivars are highly susceptible to
iron toxicity and low air temperatures.
-
1. Origin and Genealogy of Cultivars Developed by IRGA.
All 21 of
IRGA
s rice cultivars listed in Table 5.4 carry at least one parental source
originating from CIAT. Another source of genetic variability came from
the U.S. cultivars introduced in the 1970s. The
'
five rice cultivars
(BR-IRGA 409, BR-IRGA 410, BR-IRGA 412, BR-IRGA 413, and BR-IRGA
rst
