Environmental responsibility of rice var. Kum Bangpra and Riceberry in lowland and upland conditions

Abstract

Rice (Oryza sativa L.) var. Kum Bangpra is improved purple pericarp variety from pure line selection for five years during in-season and off-season to yield the desirable phenotypic characters. The chemical and physical properties were compared with Riceberry in lowland and upland conditions. Result revealed that the two rice varieties under lowland conditions was significantly differed in plant growth paramet ers eg. plant height, tillers, harvesting time, panicle’s number per hill, and yield.  Kum Bangpra variety gave the highest yield of 705.80 kg. per Rai. Riceberry resulted to yield 462.20 kg per Rai, which the growth parameters and yields were similar resulted in upland and lowland conditions. Kum Bangpra variety and Riceberry yielded 654.80 and 412.60 kg. per Rai, respectively. It is noticed that Kum Bangpra variety gave greater yield than Riceberry in both conditions. In lowland condition found that Kum Bangpra variety expressed straw-colored husk, round grain shape, dark purple husked grain, gelatinization temperature at 67°C, soft and sticky cooked rice. Whereas Riceberry revealed dark purple husk, long and slender grain, dark purple husked grain, gelatinization temperature at 70°C, and incoherent soft cooked rice. Kum Bangpra variety contained greater amount of GABA, protein, fiber, omega 3, gamma oryzanol, and antioxidants than Riceberry.  It is suggested that Kum Bangpra variety found low starch and amylose content of 7.15 % which is considered to appropriate the dietary and sugar intake.