Local Thai rice, BP2012-009 and BP2012-010 lines with purple pericarp were derived from improved varieties with bulk selection method for 2 years both in-season and off-season to obtain good phenotypic traits for extended research. The current research was aimed to examine agronomic traits, chemical and physical properties of the 2 rice lines in comparison with Riceberry variety. The experiment was arranged
in the randomized complete block design (RCBD) with 5 replications; The 2 rice lines and 1 rice variety were evaluated under 2 conditions of lowland and upland. The experiment was carried out in the paddy field and the plant science research plots in Chonburi province during September to December 2015. The result suggested that the 2 rice lines and 1 variety under lowland condition showed statistical differences in plant height, tillering, harvest age, number of panicles per hill, and yield per rai. BP2012-009 provided the best yield and yield components, with the highest yield of 705.80 kg. per rai, followed by BP2012-010 and Riceberry with yields of 648.80 kg. and 462.20 kg. per rai, respectively. Under the upland condition, the growth and yield were similar to those in lowland condition, however, less use of water than in the upland condition had resulted in reduced vegetative growth and yield per rai. BP2012-009, BP2012-010, and Riceberry produced yields of 654.80, 597.80, and 412.60 kg. per rai, respectively. This research indicated that BP2012-009 and BP2012-010 yielded greater than Riceberry in both the lowland and upland conditions. Examination of physical traits of BP2012-009, BP2012-010, and Riceberry in lowland condition found that BP2012-009 and BP2012-010 possessed the same traits, i.e. straw-colored husk, relatively round grain shape, dark purple husked grain, gelatinization temperature at 67°C, and soft and sticky cooked rice. Whereas Riceberry had dark purple husk, long and slender grain, dark purple husked grain, gelatinization temperature at 70°C, incoherent soft cooked rice. Regarding chemical properties, BP2012-009 contained a greater amount of GABA, protein, fiber, Omega 3, Gamma oryzanol, and antioxidants than Riceberry, while Riceberry contained more of essential substances including Vitamin B2, Vitamin E, Iron, Zinc, and anthocyanin than BP2012-009. It was also found that BP2012-009 contained low starch and low amylose content of 7.15 % which is considered very low and should thus be suitable for consumers who want to control dietary and sugar intake.
