CIRAD hybrid rice program: Lower breeding costs and sustainability

CIRAD hybrid rice program:

lower breeding costs and sustainability

Upland rice (Brazil Mato Grosso state) Seed density 30 Kg/ha.

One same sowing date for A and R lines. Mechanized seedling and harvesting.

Seed production cost: inferior to 1000 US$/ha.

Seed yield: between 900 and 1500 Kg/ha (without assited pollination).

.

POPULATION IMPROVEMENT

BY

RECURRENT SELECTION

? A better and faster use of the available germplasm.

? A constant accumalation of genetic progress.

? To avoid yield plateau.

? To progressively increase outcrossing ability (to facilitate seed production).

? To be completely independent of conventional inbred program

UPLAND SEED PRODUCTION

? To facilitate mechanization.

? To lower the seed production costs.

Reciprocal recurrent

population improvement

Step 1: S0 fertile (ms+) plants are selected and self-pollinated.

Step 2: Testcrosses of S1 progenies. The S1 male sterile plants

are transfered to be outcrossed by the reciplrocal population.

Step 3: Evaluation of testcrosses in replicated yield trials.

Step 4: Recombination of selected S1 progenies.

Ea_c ea r 4 n w i e h y 00 e R l n es ar a e r m R p pu ati_on ex_tr ct d f o th e o l _e r ne e r d R gu la ly new A li s ar b e o B pu a i fr m the po l t o n

Every year 2000 hybrids are

tested for seed production ability (SPA). 200 hybrids are selected

for yield and grain quality evaluation

Best hybrids are progressively selected by SPA,

yield and grain quality sucessive evaluations.

B population

(maintainer)

R population

(restorer)

SEED PRODUCTION ABILITY

FIRST SELECTION CRITERIA

(Only the hybrids which seeds are easy to produce are evaluated for

agronomical value and grain quality)

USING A SINGLE SOWING DATE

FOR

A AND R LINES

? To lower the seed production costs. ? To lower the breeding costs.

? To evaluate a greater number of new hybrids. ? To get a better efficiency in the agromical

evaluation (more seeds available).

? To facilitate mechanization (seed production and breeding trials).

A

R

R

A

A

A

Tall and late rice is used to isolate the seed production plots

EL ACEITUNO, EMBRAPA, FRONTEIRA,

ASPAR and YAAS are institutions (public

and private) associated to CIRAD to develop

hybrid rice varieties through these processes

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