Maize is a staple crop that came from humble beginnings. If you look at its wild ancestor, teosinte, the plant looks nearly unrecognizable. Human selection has persuaded the maize plant to grow in a way that produces higher yields and can be more efficiently harvested. But scientists and farmers are looking for ways, in the face of climate change, population growth, and other factors, to even further optimize maize yields. Now, researchers at Cold Spring Harbor Laboratory (CSHL) have identified a relationship between crop yield in the maize plant and specific genetic activity associated with one of the plant's metabolic pathways. The discovery has implications for plant breeding, potentially opening the door for increasingly resilient, higher-yield maize plants. CSHL Professor David Jackson and his team have connected the RAMOSA3 gene to branching, which can affect its yield. When a maize plant has too many branches, it will expend more energy towards making those branches, and less towards making seeds. More branches often means lower or less efficient yields. Ears, the part of maize that we eat, are normally not branched at all -- they just form one straight cob. But maize mutants that don't have the RAMOSA3 gene can end up with gnarly-looking branched ears. Jackson and his team initially hypothesized that the enzyme that RAMOSA3 encodes, called TPP, and a sugar phosphate called T6P which TPP acts on, are likely responsible for the ear-branching. Although the precise function of T6P remains "largely elusive," the scientists believe that it has signaling properties.
(Source: Agriculture and Food News, ScienceDaily. www.sciencedaily.com)