Nature reports that a recent study has shown that two new forms of a devastating wheat fungus, known as Ug99 stem rust,
have been found in South Africa. Concerningly they are able to overcome the effects of two
resistance genes in wheat that cause plant cells around the infection site to die,
stopping the fungus from further infecting the plant.
The article states that: "They are two of
the most important genes in wheat because they are selected for in
crop-breeding programmes across the world. The discovery of the new
forms marks the first time that the stem rust fungus with virulence
against key genetic resistance has moved south of its origins in Uganda,
east Africa. The presence of new forms of Ug99 in South Africa makes wheat crops in
areas including the Middle East and south Asia vulnerable as the fungus
can now migrate using different wind trajectories."
This is a worrying development that potentially could threaten food security unless alternative resistance varieties are developed.
Recent Comments