The productivity of a rice plant is determined by several traits -- the number and size of its grains; the height of the plant; and its flowering time, which reflects its response to the prevailing climate.
Years of previous work in rice research have helped scientists close in on the plant's Chromosome 7 for a gene that appears to affect all three characteristics -- and this appears to be the magic sequence.
The gene was identified by a team led by Qifa Zhang of Huangzhong Agricultural University in Wuhan, in an arduous exploit of field research.
The team planted 30,000 rice plants in a bid to track down the gene.
This was winnowed down to 1,082 plants that had a tell-tale low yield, as they had fewer and smaller grains, were short and flowered earlier. The culprit was found to be the lack of a gene called Ghd7.
When Ghd7 was slotted into these lagging plants, the yield traits were transformed.
The time taken to flowering doubled, and the plants became almost two-thirds taller.