Writing in the journal Science on Thursday, the researchers said they used conventional breeding methods to bring the gene into cultivated wheat varieties, enhancing the protein, zinc and iron value in the grain. The wild plant involved is known as wild emmer wheat, an ancestor of some cultivated wheat.

Wheat represents one of the major crops feeding people worldwide, providing about 20 percent of all calories consumed. The World Health Organization has said upward of 2 billion people get too little zinc and iron in their diet, and more than 160 million children under age 5 lack adequate protein.

"We really can produce wheat with more protein and more zinc and iron," Dubcovsky said in an interview. "So if that is grown in a developing country or is used as food aid, it will really provide more of those needed things in places where it's necessary."

The team included scientists from the US Department of Agriculture and the University of Haifa in Israel.

SAME TASTE

In making the wheat more nutritious, the researchers did not change how it tastes, Dubcovsky said. "We're not changing the composition or anything very dramatic in the grain," he said.

"I don't think a simple step like this will solve hunger in the world. I'm not that naive. But I think it's heading in the right direction," Dubcovsky said.

The gene made the grain mature more quickly while also boosting its protein and micronutrient content by 10-15 percent in the pasta and bread wheat varieties with which the researchers worked.

"What this gene does is it uses better what is in the plant already, so rather than leave the protein and the zinc and iron in the straw, we've moved a little bit more into the grain," Dubcovsky said.

Annual wheat production is estimated at 620 million tonnes of grain worldwide.

The wheat varieties bred by the scientists are not genetically modified, which could help them become accepted commercially, they said.

"We didn't do it by genetic modification. The normal wheat crosses perfectly well with the wild wheat. So we just crossed it after normal breeding," Dubcovsky said.