
A comparison between a GM cultivar and an ordinary one.
CAS scientists with the Institute of Plant Physiology and Ecology (IPPE) under the Shanghai Institutes for Biological Sciences have recently identified a functional gene capable of controlling the rice's grain-filling process
Grain-filling is a trait that contributes greatly to rice yields. Due to technical difficulties, breeders are still unable to directly carry out an effective selection of the related characteristics and genes, which has become a bottleneck problem for cultivar-breeding.
As reported recently online by
Nature Genetics, a research team headed by HE Zuhua with IPPE has isolated
GIF1 (grain incomplete filling 1), a key functional gene responsible for controlling the transport and unloading of glucose in the grain-filling process via constructing genetic mapping population.
In collaboration with co-workers at home and abroad, the researchers show this gene plays an important role in the domestication of rice. "By making conscious efforts to select the lines with good grain-filling property and plump grains, our ancestors enabled the cultivars to accumulate beneficial genes and therefore cultivated modern rice species," say the experts .
The findings strongly suggest that such a domestication-selected gene can be used for further crop improvement. "By proper regulation of its gene expression, the economic characteristics of a cultivated crop might be further improved, providing a new approach for molecular design of high-yielding strains of rice," note the scientists.