Chainat 1: the Thai rice made for noodles
If you've eaten Thai rice noodles, there's a good chance some of them started as Chainat 1. It isn't a rice you'll see on supermarket shelves — its firm, non-sticky cooking quality is the opposite of fragrant jasmine — but that same quality is what noodle makers want.
Where it came from
Chainat 1 was bred in Thailand and released in 1993 through the Phitsanulok Rice Research Center. It came from a cross of IRRI lines with a Thai breeding line, and was developed for farmers in the central region, where insects and diseases were limiting yields.
Key traits
| Trait | Chainat 1 |
|---|---|
| Type | Non-glutinous white rice |
| Photoperiod | Insensitive — can be grown in more than one season a year |
| Maturity | About 119–130 days |
| Plant height | About 112 cm |
| Grain | Long, slender, with slight chalkiness |
| Cooking quality | High amylose, hard gel consistency, low gelatinisation temperature |
| Resistance (at release) | Blast, ragged stunt virus, brown planthopper, whitebacked planthopper |
| Other | High yielding, strong nitrogen response, good milling quality |
Why noodle makers want high-amylose rice
Rice starch is a mix of two molecules: amylose (long, mostly straight chains) and amylopectin (highly branched). Sticky rice is almost all amylopectin. High-amylose rice behaves differently: after it is cooked and cooled, amylose chains re-align and bond (retrogradation), forming a firm gel.
For rice noodles that's exactly the point. A strong gel gives strands that hold together through steaming, drying and cooking, stay springy, and don't turn mushy or stick together. Low-amylose rice tends to give soft, sticky, easily broken noodles. Many producers also prefer rice that has been stored for a few months after harvest, as ageing changes how the starch behaves.
Why "single-variety" matters
Much paddy in Thailand passes through traders and collection points where lots from different farms — and different varieties — are combined. For a noodle factory, a mixed lot is a problem even if every grain is sound: varieties differ in amylose, gel strength and gelatinisation temperature, so a blend behaves unpredictably on the line. Water absorption changes, strands break, and texture drifts from batch to batch.
That's why buyers pay attention to how rice is sourced: contracted farmers, known seed, and lot-level records from field to mill.
Checking a Chainat 1 sample
- Grain shape: expect long, slender milled grain. With a coin in the photo, the rice.ag scanner reports length, length/width ratio and IRRI classes; a wide spread in length, or a group of noticeably shorter or bolder grains, can hint at mixing.
- Brokens and chalk: check head rice and chalkiness, which affect milling yield and flour quality.
- Amylose and gel consistency: these need a laboratory test and are worth confirming on any new supplier.
Wildfield grows, dries and mills 100% single-variety Chainat 1 with contracted farmers in Fang, Chiang Mai — no mixing, with lot-level traceability.
wildfield.org →Sources
- "Chainat 1, an Elite line of Phitsanulok Rice Research Center", FAO AGRIS record.
- Quality attributes and cooking properties of commercial Thai rice noodles, PeerJ (2021).