Drought is the most widespread and damaging of all environmental stresses, affecting 23 million hectares of rainfed rice in South and Southeast Asia. In some states in India, severe drought can cause as much as 40% yield loss, amounting to $800 million.
IRRI has developed drought-tolerant varieties which have been released in several countries and are now being planted by farmers. These include Sahbhagi Dhan in India, the Sahod Ulan in the Philippines, and the Sookha Dhan varieties in Nepal. Across these varieties, the average yield advantage of drought-tolerant varieties over drought-susceptible ones is 0.8-1.2 tons per hectare under drought.
IRRI scientists have identified several key regions of the rice genome—called quantitative trait loci (QTLs)—that give the rice drought tolerance and improve rice grain yield under such conditions. IRRI is working towards introducing drought tolerance into popular high-yielding rice varieties including IR64, Swarna, and Vandna.
We are also studying what the molecular and physiological processes that these drought-tolerant QTL provide to get a better insight into this complex trait.
Drought is the most widespread and damaging of all environmental stresses, affecting 23 million hectares of rainfed rice in South and Southeast Asia. In some states in India, severe drought can cause as much as 40% yield loss, amounting to $800 million.
IRRI has developed drought-tolerant varieties which have been released in several countries and are now being planted by farmers. These include Sahbhagi Dhan in India, the Sahod Ulan in the Philippines, and the Sookha Dhan varieties in Nepal. Across these varieties, the average yield advantage of drought-tolerant varieties over drought-susceptible ones is 0.8-1.2 tons per hectare under drought.
IRRI scientists have identified several key regions of the rice genome—called quantitative trait loci (QTLs)—that give the rice drought tolerance and improve rice grain yield under such conditions. IRRI is working towards introducing drought tolerance into popular high-yielding rice varieties including IR64, Swarna, and Vandna.
We are also studying what the molecular and physiological processes that these drought-tolerant QTL provide to get a better insight into this complex trait.
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