The search for these genes is focusing on tropical varieties of corn; the genes would be transferred to American corn varieties along with the drought tolerance they confer on plants. The desired equation is simple: maximum yield for minimum water use. As such, it is likely the most useful genes will be related to the control of transpiration -- the opening and closing of stomata on the leaf surface.
Meanwhile, the US droughts are forcing authorities to open up protected land to help farmers feed stock. Agriculture Secretary Tom Vilsack has authority to open up land under the voluntary Conservation Reserve Programme for emergency grazing.
According to US Drought Monitor data, 88% of US corn and 87% of US soybean crops are in drought-stricken areas. Global grain prices have soared over recent weeks.
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