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New flood-tolerant rice offers relief for world's poorest farmers

y successful inconferring submergence tolerance to rice because it affects the waythe plants respond to hormones, such as ethylene and giberellic acid,that are key to the plant's ability to survive even when inundatedwith water.

Going one step further, the researchers introduced the Sub1A geneinto a rice variety that is especially suited for growing conditionsin India. The resulting rice plants were not only tolerant of beingsubmerged in water but also produced high yields and retained otherbeneficial crop qualities. Development of submergence-tolerantvarieties for commercial production in Laos, Bangladesh and India isnow well under way.

In addition to providing a more stable supply of rice in developingcountries, the researchers are hoping that the new gene will beuseful in suppressing weeds and reducing herbicide applications forconventional and organic rice farmers in developed countries like theUnited States. If water can be left on the rice for an additionalweek, it is expected that weed populations will be reduced.

The research team is now trying to identify all the genes that areregulated by Sub1A and to use this information to further improvetolerance to flooding and other stresses.


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Source:University of California - Davis


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