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Glutinous rice

Type of rice

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  • 6 chapters

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Through Rice, South Asia and Gene flow

It is called glutinous (Latin: glūtinōsus) in the sense of being glue-like or sticky, and not in the sense of containing gluten (which, like all rice, it does not). While often called sticky rice, it differs from non-glutinous strains of japonica rice, which also becomes sticky to some degree when cooked. There are numerous cultivars of glutinous rice, which include japonica, indica and tropical japonica strains.

History

The origin of glutinous rice is difficult to ascertain because of its long-standing cultural importance across a wide geographical region in Asia.

A 2002 genetic study discovered that the waxy mutation that disrupted amylose synthesis likely has a single origin. This is supported by the fact that all glutinous rice accessions in the study contain the same mutation. From comparisons of subsequent mutations in the different accessions in the study, it was found that the progenitor haplotype is highest among Southeast Asian glutinous rice cultivars, indicating strongly that the waxy mutation first arose in Southeast Asia, likely in the upland regions of Mainland Southeast Asia, before spreading to the rest of Asia.

The waxy mutation is also known to have first arisen in temperate japonica rice, where it is far more common, before spreading to tropical japonica rice (javanica) and indica cultivars via gene flow.

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