Agriculture Reference
In-Depth Information
Cold tolerance during germination and seedling stage is another charac-
teristic thatmust be taken into account. In the southern area, cold tolerance
is important for crop establishment, whereas in the northern area, it is
important to obtain earlier planting dates. In addition to those general
objectives, the Concepción del Uruguay Experiment Station conducted a
programwithmutagenesis,
finding a source of tolerance of imidazolinone
herbicides (Livore 2006) that has been transferred to several cultivars.
3. Achievements.
In the past, Argentina
s rice production was based
on foreign cultivars, with only a few locally developed cultivars. Starting
in the mid-1980s, tropical cultivars rapidly increased their participation,
replacing U.S. cultivars. In the last two decades, local programs have
made an important contribution in providing genetic material for Argen-
tinean rice production and several important cultivars were registered
by local programs.
CT6919-INTA, registered in1995, was a veryhigh-yielding cultivar that
occupied important areas in the northern zone. Because of its suscepti-
bility to lodging and harvest delay, it has almost disappeared. In 1997, La
Arrocera Argentina registered RP2, an early high-quality cultivar that is
still planted in the southern area (province of Entre Ríos). Camba-INTA
was registered in 2004 as a high-yielding, high-quality cultivar suitable for
the southern area, and it is still planted. In 2005, Puita-INTA CL was
registered with the characteristic of being tolerant of IMI herbicides, thus
becoming a good alternative for areas highly infestedwithweedy rice (red
rice) and still covering large planting areas not only in Argentina but also
in other countries. The use of Puita-INTA CL helped to recover important
planting areas highly infested with red rice in the province of Santa Fe. In
other areas, it allows an ef
'
cient control of some rhizomatous weeds that
are very dif
cult to control through conventional herbicides.
In 2011, two other cultivars were registered. One was Guri-INTA CL,
which in addition to its characteristic of tolerance to IMI herbicides
has the advantage of higher yield than Puita. However, it was highly sus-
ceptible to blast during the last growing season. The second cultivar was
Tranquilo-FL-INTA, the
first cultivar of FLAR origin to be registered for
the Southern Cone. It is a high-yielding cultivar with good grain quality
and tolerance of harvest delay, with a
type (Marin 2010).
Other breeding companies also made some important releases.
Bayer registered Supremo 1 in 2002 and QM 13 in 2006. Pilaga Semillas
registered Ita Caabo 105 in 2008 and recently registered Ita Caabo 110.
The market share of hybrid cultivars is small, with all of them coming
from the RiceTec breeding program. The most important ones are Tiba,
Avaxi CL, and Inov CL.
“
compact plant
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