Australian researchers at the University of Adelaide have identified a naturally occurring wheat gene that, when turned off, eliminates self-pollination but still allows cross-pollination – opening the way for breeding high-yielding hybrid wheats.
Published in the journal Nature Communications, and in collaboration with U.S.-based plant genetics company DuPont Pioneer, the researchers say this discovery and the associated breeding technology have the potential to radically change the way wheat is bred in Australia and internationally.
“Wheat is the world’s most widely grown crop, delivering around 20 per cent of total food calories and protein to the world’s population,” says Ryan Whitford, Hybrid Wheat Program Leader at the University of Adelaide’s School of Agriculture, Food and Wine.
“But to meet increased food demand from predicted global population growth, its production needs to increase by 60 per cent by 2050. One of the most promising options to meet this demand is for farmers to grow hybrid wheat varieties, which can offer a 10 to 15 per cent yield boost relative to conventionally bred varieties that are currently on the market.”
Hybrid wheats result from crosses between two carefully selected pure wheat lines. The challenge to produce hybrid wheat, however, is in the breeding and commercial multiplication of the hybrid parent seed. Wheat is a self-pollinator while the production of hybrid seed requires large-scale cross-pollination.
In the United States, DuPont Pioneer has developed an innovative breeding technology for corn called Seed Production Technology (SPT) used to bulk up parent breeding lines for hybrid production.
“The pollination gene is ‘biologically contained’ to the breeding process and does not make its way past the grandparent stage in producing the end-user hybrid seed,” says Marc Albertsen, Research Director, DuPont Pioneer. “This identified pollination gene is the key step for a similar technology for wheat and could dramatically increase the efficiency of hybrid wheat seed production.”
Source: University of Adelaide