Colored rice or pigmented rice refers to the color of rice kernel such as black, purple and red which is form by deposits of anthocyanin in different layers of the pericarp, seedcoat and aluerone layers. This experiment was to evaluate nutritional values (anthocyanin, iron and zinc) of rice grain among local colored rice varieties. Variation among varieties for anthocyanin, iron and zinc concentrations were found in brown rice, white rice and bran. Significant amount of anthocyanin concentration was found in black color rice, whereas very low concentration was found in red and brown color rice. Among all black rice, the highest anthocyanin concentration was found in Niaw Dam 6 collected from Udon Thani (90 mg/100 g in brown rice) and (820 mg/100 g in...
Variation in zinc (Zn) concentration in the grain of 50 local rice varieties from Southern Thailand was examined by diphenyl thiocarbazone (DTZ) staining (intense, medium, low, and nil) and chemical analysis. Intense staining was found in the aleurone layer of 94% of the varieties, in the embryo 56% of the varieties and endosperm 12% of the varieties. Variation was found in the DTZ staining intensity of the embryo and endosperm of individual grains, with Shannon-weaver diversity index (H) of the DTZ staining at 0.15-1.00 for the embryo and 0.00-1.00 for the endosperm. Chemical analysis found the Zn concentration in brown rice grain ranging between 18-34 mg Zn/kg, 7 varieties were considered high grain Zn (29-34 mg Zn/kg). The Zn concentration in the husk...
Pathum Thani 1 (PTT1) grown in Northern Thailand is often rejected by buyers on the basis of it poor quality, while it is a popular variety among farmers and rice mills in the Central region. This study evaluated head rice yield and chalkiness in dry season of PTT1 from different regions of Thailand. Samples of dry season 2011 crop of PTT1 were collected from the Upper North, Lower North, Central, East, and Northeast. Sixty-seven paddy samples were dehulled and milled individually. The milled rice of each sample was separated into head and broken rice to determine percentage of head rice. Percentage of chalkiness was determined by weight of chalky grain, in both whole and broken grain. The Central region had the highest percentage of chalkiness (49.1%) and...
The development of a water saving rice growing system was stemmed from an attempt to manage efficient water usage, whereby reducing level of water use but still maintaining acceptable level of yield. To be successful in implementing the water saving rice growing system, it is necessary to understand a suitable photosynthetic mechanism and photosynthetic efficiency of each rice cultivar to be grown in such system. An understanding of such knowledge will lead to a better selection of healthy and high yielding cultivars. As such, this study was aimed to compare responses of 10 Thai rice cultivars in terms of photosynthesis rate and growth in well-drained and water-logged systems. Our data indicated that almost all rice cultivars grown under either...
