Oryza sativa indicates that rice domestication likely began before 5000 BC, but that most sites in China from which rice remains have been recovered are younger than 5000 BC. Rice begins to be cultivated in South Asia from as early as 5000 BC. Wild rice appeared in the Belan and Ganges valley regions of northern India as early as 4530 BC and 5440 BC, respectively, J.Bates et al.(2016) found early domestication process of rice in ancient South Asia was based around the wild species "Oryza nivara". This led to the local development of a mix of 'wetland' and 'dryland' agriculture of local
Helitron (biology) Helitron (biology) Helitrons are one of the three groups of eukaryotic class 2 transposable elements (TEs) so far described. They are the eukaryotic rolling-circle transposable elements which are hypothesized to transpose by a rolling circle replication mechanism via a single-stranded DNA intermediate. They were first discovered in plants ("Arabidopsis thaliana" and "Oryza sativa") and in the nematode "Caenorhabditis elegans", and now they have been identified in a diverse range of species, from protists to mammals. Helitrons make up a substantial fraction of many genomes where non-autonomous elements frequently outnumber the putative autonomous partner. Helitrons seem to have a major role